| /* |
| * Mesa 3-D graphics library |
| * Version: 6.5 |
| * |
| * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| |
| /** |
| * \file swrast/s_span.c |
| * \brief Span processing functions used by all rasterization functions. |
| * This is where all the per-fragment tests are performed |
| * \author Brian Paul |
| */ |
| |
| #include "glheader.h" |
| #include "colormac.h" |
| #include "context.h" |
| #include "macros.h" |
| #include "imports.h" |
| #include "image.h" |
| |
| #include "s_atifragshader.h" |
| #include "s_alpha.h" |
| #include "s_arbshader.h" |
| #include "s_blend.h" |
| #include "s_context.h" |
| #include "s_depth.h" |
| #include "s_fog.h" |
| #include "s_logic.h" |
| #include "s_masking.h" |
| #include "s_nvfragprog.h" |
| #include "s_span.h" |
| #include "s_stencil.h" |
| #include "s_texcombine.h" |
| |
| |
| /** |
| * Init span's Z interpolation values to the RasterPos Z. |
| * Used during setup for glDraw/CopyPixels. |
| */ |
| void |
| _swrast_span_default_z( GLcontext *ctx, SWspan *span ) |
| { |
| const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF; |
| if (ctx->DrawBuffer->Visual.depthBits <= 16) |
| span->z = FloatToFixed(ctx->Current.RasterPos[2] * depthMax + 0.5F); |
| else |
| span->z = (GLint) (ctx->Current.RasterPos[2] * depthMax + 0.5F); |
| span->zStep = 0; |
| span->interpMask |= SPAN_Z; |
| } |
| |
| |
| /** |
| * Init span's fog interpolation values to the RasterPos fog. |
| * Used during setup for glDraw/CopyPixels. |
| */ |
| void |
| _swrast_span_default_fog( GLcontext *ctx, SWspan *span ) |
| { |
| span->fog = _swrast_z_to_fogfactor(ctx, ctx->Current.RasterDistance); |
| span->fogStep = span->dfogdx = span->dfogdy = 0.0F; |
| span->interpMask |= SPAN_FOG; |
| } |
| |
| |
| /** |
| * Init span's rgba or index interpolation values to the RasterPos color. |
| * Used during setup for glDraw/CopyPixels. |
| */ |
| void |
| _swrast_span_default_color( GLcontext *ctx, SWspan *span ) |
| { |
| if (ctx->Visual.rgbMode) { |
| GLchan r, g, b, a; |
| UNCLAMPED_FLOAT_TO_CHAN(r, ctx->Current.RasterColor[0]); |
| UNCLAMPED_FLOAT_TO_CHAN(g, ctx->Current.RasterColor[1]); |
| UNCLAMPED_FLOAT_TO_CHAN(b, ctx->Current.RasterColor[2]); |
| UNCLAMPED_FLOAT_TO_CHAN(a, ctx->Current.RasterColor[3]); |
| #if CHAN_TYPE == GL_FLOAT |
| span->red = r; |
| span->green = g; |
| span->blue = b; |
| span->alpha = a; |
| #else |
| span->red = IntToFixed(r); |
| span->green = IntToFixed(g); |
| span->blue = IntToFixed(b); |
| span->alpha = IntToFixed(a); |
| #endif |
| span->redStep = 0; |
| span->greenStep = 0; |
| span->blueStep = 0; |
| span->alphaStep = 0; |
| span->interpMask |= SPAN_RGBA; |
| } |
| else { |
| span->index = FloatToFixed(ctx->Current.RasterIndex); |
| span->indexStep = 0; |
| span->interpMask |= SPAN_INDEX; |
| } |
| } |
| |
| |
| /** |
| * Init span's texcoord interpolation values to the RasterPos texcoords. |
| * Used during setup for glDraw/CopyPixels. |
| */ |
| void |
| _swrast_span_default_texcoords( GLcontext *ctx, SWspan *span ) |
| { |
| GLuint i; |
| for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) { |
| const GLfloat *tc = ctx->Current.RasterTexCoords[i]; |
| if (ctx->FragmentProgram._Enabled || ctx->ATIFragmentShader._Enabled) { |
| COPY_4V(span->tex[i], tc); |
| } |
| else if (tc[3] > 0.0F) { |
| /* use (s/q, t/q, r/q, 1) */ |
| span->tex[i][0] = tc[0] / tc[3]; |
| span->tex[i][1] = tc[1] / tc[3]; |
| span->tex[i][2] = tc[2] / tc[3]; |
| span->tex[i][3] = 1.0; |
| } |
| else { |
| ASSIGN_4V(span->tex[i], 0.0F, 0.0F, 0.0F, 1.0F); |
| } |
| ASSIGN_4V(span->texStepX[i], 0.0F, 0.0F, 0.0F, 0.0F); |
| ASSIGN_4V(span->texStepY[i], 0.0F, 0.0F, 0.0F, 0.0F); |
| } |
| span->interpMask |= SPAN_TEXTURE; |
| } |
| |
| |
| /** |
| * Interpolate primary colors to fill in the span->array->color array. |
| */ |
| static void |
| interpolate_colors(SWspan *span) |
| { |
| const GLuint n = span->end; |
| GLuint i; |
| |
| ASSERT((span->interpMask & SPAN_RGBA) && |
| !(span->arrayMask & SPAN_RGBA)); |
| |
| switch (span->array->ChanType) { |
| #if CHAN_BITS != 32 |
| case GL_UNSIGNED_BYTE: |
| { |
| GLubyte (*rgba)[4] = span->array->color.sz1.rgba; |
| if (span->interpMask & SPAN_FLAT) { |
| GLubyte color[4]; |
| color[RCOMP] = FixedToInt(span->red); |
| color[GCOMP] = FixedToInt(span->green); |
| color[BCOMP] = FixedToInt(span->blue); |
| color[ACOMP] = FixedToInt(span->alpha); |
| for (i = 0; i < n; i++) { |
| COPY_4UBV(rgba[i], color); |
| } |
| } |
| else { |
| GLfixed r = span->red; |
| GLfixed g = span->green; |
| GLfixed b = span->blue; |
| GLfixed a = span->alpha; |
| GLint dr = span->redStep; |
| GLint dg = span->greenStep; |
| GLint db = span->blueStep; |
| GLint da = span->alphaStep; |
| for (i = 0; i < n; i++) { |
| rgba[i][RCOMP] = FixedToChan(r); |
| rgba[i][GCOMP] = FixedToChan(g); |
| rgba[i][BCOMP] = FixedToChan(b); |
| rgba[i][ACOMP] = FixedToChan(a); |
| r += dr; |
| g += dg; |
| b += db; |
| a += da; |
| } |
| } |
| } |
| break; |
| case GL_UNSIGNED_SHORT: |
| { |
| GLushort (*rgba)[4] = span->array->color.sz2.rgba; |
| if (span->interpMask & SPAN_FLAT) { |
| GLushort color[4]; |
| color[RCOMP] = FixedToInt(span->red); |
| color[GCOMP] = FixedToInt(span->green); |
| color[BCOMP] = FixedToInt(span->blue); |
| color[ACOMP] = FixedToInt(span->alpha); |
| for (i = 0; i < n; i++) { |
| COPY_4V(rgba[i], color); |
| } |
| } |
| else { |
| GLushort (*rgba)[4] = span->array->color.sz2.rgba; |
| GLfixed r, g, b, a; |
| GLint dr, dg, db, da; |
| r = span->red; |
| g = span->green; |
| b = span->blue; |
| a = span->alpha; |
| dr = span->redStep; |
| dg = span->greenStep; |
| db = span->blueStep; |
| da = span->alphaStep; |
| for (i = 0; i < n; i++) { |
| rgba[i][RCOMP] = FixedToChan(r); |
| rgba[i][GCOMP] = FixedToChan(g); |
| rgba[i][BCOMP] = FixedToChan(b); |
| rgba[i][ACOMP] = FixedToChan(a); |
| r += dr; |
| g += dg; |
| b += db; |
| a += da; |
| } |
| } |
| } |
| break; |
| #endif |
| case GL_FLOAT: |
| { |
| GLfloat (*rgba)[4] = span->array->color.sz4.rgba; |
| GLfloat r, g, b, a, dr, dg, db, da; |
| r = span->red; |
| g = span->green; |
| b = span->blue; |
| a = span->alpha; |
| if (span->interpMask & SPAN_FLAT) { |
| dr = dg = db = da = 0.0; |
| } |
| else { |
| dr = span->redStep; |
| dg = span->greenStep; |
| db = span->blueStep; |
| da = span->alphaStep; |
| } |
| for (i = 0; i < n; i++) { |
| rgba[i][RCOMP] = r; |
| rgba[i][GCOMP] = g; |
| rgba[i][BCOMP] = b; |
| rgba[i][ACOMP] = a; |
| r += dr; |
| g += dg; |
| b += db; |
| a += da; |
| } |
| } |
| break; |
| default: |
| _mesa_problem(NULL, "bad datatype in interpolate_colors"); |
| } |
| span->arrayMask |= SPAN_RGBA; |
| } |
| |
| |
| /** |
| * Interpolate specular/secondary colors. |
| */ |
| static void |
| interpolate_specular(SWspan *span) |
| { |
| const GLuint n = span->end; |
| GLuint i; |
| |
| switch (span->array->ChanType) { |
| case GL_UNSIGNED_BYTE: |
| { |
| GLubyte (*spec)[4] = span->array->color.sz1.spec; |
| if (span->interpMask & SPAN_FLAT) { |
| GLubyte color[4]; |
| color[RCOMP] = FixedToInt(span->specRed); |
| color[GCOMP] = FixedToInt(span->specGreen); |
| color[BCOMP] = FixedToInt(span->specBlue); |
| color[ACOMP] = 0; |
| for (i = 0; i < n; i++) { |
| COPY_4UBV(spec[i], color); |
| } |
| } |
| else { |
| GLfixed r = span->specRed; |
| GLfixed g = span->specGreen; |
| GLfixed b = span->specBlue; |
| GLint dr = span->specRedStep; |
| GLint dg = span->specGreenStep; |
| GLint db = span->specBlueStep; |
| for (i = 0; i < n; i++) { |
| spec[i][RCOMP] = CLAMP(FixedToChan(r), 0, 255); |
| spec[i][GCOMP] = CLAMP(FixedToChan(g), 0, 255); |
| spec[i][BCOMP] = CLAMP(FixedToChan(b), 0, 255); |
| spec[i][ACOMP] = 0; |
| r += dr; |
| g += dg; |
| b += db; |
| } |
| } |
| } |
| break; |
| case GL_UNSIGNED_SHORT: |
| { |
| GLushort (*spec)[4] = span->array->color.sz2.spec; |
| if (span->interpMask & SPAN_FLAT) { |
| GLushort color[4]; |
| color[RCOMP] = FixedToInt(span->specRed); |
| color[GCOMP] = FixedToInt(span->specGreen); |
| color[BCOMP] = FixedToInt(span->specBlue); |
| color[ACOMP] = 0; |
| for (i = 0; i < n; i++) { |
| COPY_4V(spec[i], color); |
| } |
| } |
| else { |
| GLfixed r = FloatToFixed(span->specRed); |
| GLfixed g = FloatToFixed(span->specGreen); |
| GLfixed b = FloatToFixed(span->specBlue); |
| GLint dr = FloatToFixed(span->specRedStep); |
| GLint dg = FloatToFixed(span->specGreenStep); |
| GLint db = FloatToFixed(span->specBlueStep); |
| for (i = 0; i < n; i++) { |
| spec[i][RCOMP] = FixedToInt(r); |
| spec[i][GCOMP] = FixedToInt(g); |
| spec[i][BCOMP] = FixedToInt(b); |
| spec[i][ACOMP] = 0; |
| r += dr; |
| g += dg; |
| b += db; |
| } |
| } |
| } |
| break; |
| case GL_FLOAT: |
| { |
| GLfloat (*spec)[4] = span->array->color.sz4.spec; |
| if (span->interpMask & SPAN_FLAT) { |
| GLfloat color[4]; |
| color[RCOMP] = span->specRed; |
| color[GCOMP] = span->specGreen; |
| color[BCOMP] = span->specBlue; |
| color[ACOMP] = 0.0F; |
| for (i = 0; i < n; i++) { |
| COPY_4V(spec[i], color); |
| } |
| } |
| else { |
| GLfloat r = span->specRed; |
| GLfloat g = span->specGreen; |
| GLfloat b = span->specBlue; |
| GLfloat dr = span->specRedStep; |
| GLfloat dg = span->specGreenStep; |
| GLfloat db = span->specBlueStep; |
| for (i = 0; i < n; i++) { |
| spec[i][RCOMP] = r; |
| spec[i][GCOMP] = g; |
| spec[i][BCOMP] = b; |
| spec[i][ACOMP] = 0.0F; |
| r += dr; |
| g += dg; |
| b += db; |
| } |
| } |
| } |
| break; |
| default: |
| _mesa_problem(NULL, "bad datatype in interpolate_specular"); |
| } |
| span->arrayMask |= SPAN_SPEC; |
| } |
| |
| |
| /* Fill in the span.color.index array from the interpolation values */ |
| static void |
| interpolate_indexes(GLcontext *ctx, SWspan *span) |
| { |
| GLfixed index = span->index; |
| const GLint indexStep = span->indexStep; |
| const GLuint n = span->end; |
| GLuint *indexes = span->array->index; |
| GLuint i; |
| (void) ctx; |
| ASSERT((span->interpMask & SPAN_INDEX) && |
| !(span->arrayMask & SPAN_INDEX)); |
| |
| if ((span->interpMask & SPAN_FLAT) || (indexStep == 0)) { |
| /* constant color */ |
| index = FixedToInt(index); |
| for (i = 0; i < n; i++) { |
| indexes[i] = index; |
| } |
| } |
| else { |
| /* interpolate */ |
| for (i = 0; i < n; i++) { |
| indexes[i] = FixedToInt(index); |
| index += indexStep; |
| } |
| } |
| span->arrayMask |= SPAN_INDEX; |
| span->interpMask &= ~SPAN_INDEX; |
| } |
| |
| |
| /* Fill in the span.array.fog values from the interpolation values */ |
| static void |
| interpolate_fog(const GLcontext *ctx, SWspan *span) |
| { |
| GLfloat *fog = span->array->fog; |
| const GLfloat fogStep = span->fogStep; |
| GLfloat fogCoord = span->fog; |
| const GLuint haveW = (span->interpMask & SPAN_W); |
| const GLfloat wStep = haveW ? span->dwdx : 0.0F; |
| GLfloat w = haveW ? span->w : 1.0F; |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| fog[i] = fogCoord / w; |
| fogCoord += fogStep; |
| w += wStep; |
| } |
| span->arrayMask |= SPAN_FOG; |
| } |
| |
| |
| /* Fill in the span.zArray array from the interpolation values */ |
| void |
| _swrast_span_interpolate_z( const GLcontext *ctx, SWspan *span ) |
| { |
| const GLuint n = span->end; |
| GLuint i; |
| |
| ASSERT((span->interpMask & SPAN_Z) && |
| !(span->arrayMask & SPAN_Z)); |
| |
| if (ctx->DrawBuffer->Visual.depthBits <= 16) { |
| GLfixed zval = span->z; |
| GLuint *z = span->array->z; |
| for (i = 0; i < n; i++) { |
| z[i] = FixedToInt(zval); |
| zval += span->zStep; |
| } |
| } |
| else { |
| /* Deep Z buffer, no fixed->int shift */ |
| GLuint zval = span->z; |
| GLuint *z = span->array->z; |
| for (i = 0; i < n; i++) { |
| z[i] = zval; |
| zval += span->zStep; |
| } |
| } |
| span->interpMask &= ~SPAN_Z; |
| span->arrayMask |= SPAN_Z; |
| } |
| |
| |
| /* |
| * This the ideal solution, as given in the OpenGL spec. |
| */ |
| #if 0 |
| static GLfloat |
| compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy, |
| GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH, |
| GLfloat s, GLfloat t, GLfloat q, GLfloat invQ) |
| { |
| GLfloat dudx = texW * ((s + dsdx) / (q + dqdx) - s * invQ); |
| GLfloat dvdx = texH * ((t + dtdx) / (q + dqdx) - t * invQ); |
| GLfloat dudy = texW * ((s + dsdy) / (q + dqdy) - s * invQ); |
| GLfloat dvdy = texH * ((t + dtdy) / (q + dqdy) - t * invQ); |
| GLfloat x = SQRTF(dudx * dudx + dvdx * dvdx); |
| GLfloat y = SQRTF(dudy * dudy + dvdy * dvdy); |
| GLfloat rho = MAX2(x, y); |
| GLfloat lambda = LOG2(rho); |
| return lambda; |
| } |
| #endif |
| |
| |
| /* |
| * This is a faster approximation |
| */ |
| GLfloat |
| _swrast_compute_lambda(GLfloat dsdx, GLfloat dsdy, GLfloat dtdx, GLfloat dtdy, |
| GLfloat dqdx, GLfloat dqdy, GLfloat texW, GLfloat texH, |
| GLfloat s, GLfloat t, GLfloat q, GLfloat invQ) |
| { |
| GLfloat dsdx2 = (s + dsdx) / (q + dqdx) - s * invQ; |
| GLfloat dtdx2 = (t + dtdx) / (q + dqdx) - t * invQ; |
| GLfloat dsdy2 = (s + dsdy) / (q + dqdy) - s * invQ; |
| GLfloat dtdy2 = (t + dtdy) / (q + dqdy) - t * invQ; |
| GLfloat maxU, maxV, rho, lambda; |
| dsdx2 = FABSF(dsdx2); |
| dsdy2 = FABSF(dsdy2); |
| dtdx2 = FABSF(dtdx2); |
| dtdy2 = FABSF(dtdy2); |
| maxU = MAX2(dsdx2, dsdy2) * texW; |
| maxV = MAX2(dtdx2, dtdy2) * texH; |
| rho = MAX2(maxU, maxV); |
| lambda = LOG2(rho); |
| return lambda; |
| } |
| |
| |
| /** |
| * Fill in the span.texcoords array from the interpolation values. |
| * Note: in the places where we divide by Q (or mult by invQ) we're |
| * really doing two things: perspective correction and texcoord |
| * projection. Remember, for texcoord (s,t,r,q) we need to index |
| * texels with (s/q, t/q, r/q). |
| * If we're using a fragment program, we never do the division |
| * for texcoord projection. That's done by the TXP instruction |
| * or user-written code. |
| */ |
| static void |
| interpolate_texcoords(GLcontext *ctx, SWspan *span) |
| { |
| ASSERT(span->interpMask & SPAN_TEXTURE); |
| ASSERT(!(span->arrayMask & SPAN_TEXTURE)); |
| |
| if (ctx->Texture._EnabledCoordUnits > 1) { |
| /* multitexture */ |
| GLuint u; |
| span->arrayMask |= SPAN_TEXTURE; |
| /* XXX CoordUnits vs. ImageUnits */ |
| for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
| if (ctx->Texture._EnabledCoordUnits & (1 << u)) { |
| const struct gl_texture_object *obj =ctx->Texture.Unit[u]._Current; |
| GLfloat texW, texH; |
| GLboolean needLambda; |
| if (obj) { |
| const struct gl_texture_image *img = obj->Image[0][obj->BaseLevel]; |
| needLambda = (obj->MinFilter != obj->MagFilter) |
| || ctx->FragmentProgram._Enabled; |
| texW = img->WidthScale; |
| texH = img->HeightScale; |
| } |
| else { |
| /* using a fragment program */ |
| texW = 1.0; |
| texH = 1.0; |
| needLambda = GL_FALSE; |
| } |
| if (needLambda) { |
| GLfloat (*texcoord)[4] = span->array->texcoords[u]; |
| GLfloat *lambda = span->array->lambda[u]; |
| const GLfloat dsdx = span->texStepX[u][0]; |
| const GLfloat dsdy = span->texStepY[u][0]; |
| const GLfloat dtdx = span->texStepX[u][1]; |
| const GLfloat dtdy = span->texStepY[u][1]; |
| const GLfloat drdx = span->texStepX[u][2]; |
| const GLfloat dqdx = span->texStepX[u][3]; |
| const GLfloat dqdy = span->texStepY[u][3]; |
| GLfloat s = span->tex[u][0]; |
| GLfloat t = span->tex[u][1]; |
| GLfloat r = span->tex[u][2]; |
| GLfloat q = span->tex[u][3]; |
| GLuint i; |
| if (ctx->FragmentProgram._Enabled || ctx->ATIFragmentShader._Enabled || |
| ctx->ShaderObjects._FragmentShaderPresent) { |
| /* do perspective correction but don't divide s, t, r by q */ |
| const GLfloat dwdx = span->dwdx; |
| GLfloat w = span->w; |
| for (i = 0; i < span->end; i++) { |
| const GLfloat invW = 1.0F / w; |
| texcoord[i][0] = s * invW; |
| texcoord[i][1] = t * invW; |
| texcoord[i][2] = r * invW; |
| texcoord[i][3] = q * invW; |
| lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, |
| dqdx, dqdy, texW, texH, |
| s, t, q, invW); |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| q += dqdx; |
| w += dwdx; |
| } |
| |
| } |
| else { |
| for (i = 0; i < span->end; i++) { |
| const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
| texcoord[i][0] = s * invQ; |
| texcoord[i][1] = t * invQ; |
| texcoord[i][2] = r * invQ; |
| texcoord[i][3] = q; |
| lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, |
| dqdx, dqdy, texW, texH, |
| s, t, q, invQ); |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| q += dqdx; |
| } |
| } |
| span->arrayMask |= SPAN_LAMBDA; |
| } |
| else { |
| GLfloat (*texcoord)[4] = span->array->texcoords[u]; |
| GLfloat *lambda = span->array->lambda[u]; |
| const GLfloat dsdx = span->texStepX[u][0]; |
| const GLfloat dtdx = span->texStepX[u][1]; |
| const GLfloat drdx = span->texStepX[u][2]; |
| const GLfloat dqdx = span->texStepX[u][3]; |
| GLfloat s = span->tex[u][0]; |
| GLfloat t = span->tex[u][1]; |
| GLfloat r = span->tex[u][2]; |
| GLfloat q = span->tex[u][3]; |
| GLuint i; |
| if (ctx->FragmentProgram._Enabled || ctx->ATIFragmentShader._Enabled || |
| ctx->ShaderObjects._FragmentShaderPresent) { |
| /* do perspective correction but don't divide s, t, r by q */ |
| const GLfloat dwdx = span->dwdx; |
| GLfloat w = span->w; |
| for (i = 0; i < span->end; i++) { |
| const GLfloat invW = 1.0F / w; |
| texcoord[i][0] = s * invW; |
| texcoord[i][1] = t * invW; |
| texcoord[i][2] = r * invW; |
| texcoord[i][3] = q * invW; |
| lambda[i] = 0.0; |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| q += dqdx; |
| w += dwdx; |
| } |
| } |
| else if (dqdx == 0.0F) { |
| /* Ortho projection or polygon's parallel to window X axis */ |
| const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
| for (i = 0; i < span->end; i++) { |
| texcoord[i][0] = s * invQ; |
| texcoord[i][1] = t * invQ; |
| texcoord[i][2] = r * invQ; |
| texcoord[i][3] = q; |
| lambda[i] = 0.0; |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| } |
| } |
| else { |
| for (i = 0; i < span->end; i++) { |
| const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
| texcoord[i][0] = s * invQ; |
| texcoord[i][1] = t * invQ; |
| texcoord[i][2] = r * invQ; |
| texcoord[i][3] = q; |
| lambda[i] = 0.0; |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| q += dqdx; |
| } |
| } |
| } /* lambda */ |
| } /* if */ |
| } /* for */ |
| } |
| else { |
| /* single texture */ |
| const struct gl_texture_object *obj = ctx->Texture.Unit[0]._Current; |
| GLfloat texW, texH; |
| GLboolean needLambda; |
| if (obj) { |
| const struct gl_texture_image *img = obj->Image[0][obj->BaseLevel]; |
| needLambda = (obj->MinFilter != obj->MagFilter) |
| || ctx->FragmentProgram._Enabled; |
| texW = (GLfloat) img->WidthScale; |
| texH = (GLfloat) img->HeightScale; |
| } |
| else { |
| needLambda = GL_FALSE; |
| texW = texH = 1.0; |
| } |
| span->arrayMask |= SPAN_TEXTURE; |
| if (needLambda) { |
| /* just texture unit 0, with lambda */ |
| GLfloat (*texcoord)[4] = span->array->texcoords[0]; |
| GLfloat *lambda = span->array->lambda[0]; |
| const GLfloat dsdx = span->texStepX[0][0]; |
| const GLfloat dsdy = span->texStepY[0][0]; |
| const GLfloat dtdx = span->texStepX[0][1]; |
| const GLfloat dtdy = span->texStepY[0][1]; |
| const GLfloat drdx = span->texStepX[0][2]; |
| const GLfloat dqdx = span->texStepX[0][3]; |
| const GLfloat dqdy = span->texStepY[0][3]; |
| GLfloat s = span->tex[0][0]; |
| GLfloat t = span->tex[0][1]; |
| GLfloat r = span->tex[0][2]; |
| GLfloat q = span->tex[0][3]; |
| GLuint i; |
| if (ctx->FragmentProgram._Enabled || ctx->ATIFragmentShader._Enabled || |
| ctx->ShaderObjects._FragmentShaderPresent) { |
| /* do perspective correction but don't divide s, t, r by q */ |
| const GLfloat dwdx = span->dwdx; |
| GLfloat w = span->w; |
| for (i = 0; i < span->end; i++) { |
| const GLfloat invW = 1.0F / w; |
| texcoord[i][0] = s * invW; |
| texcoord[i][1] = t * invW; |
| texcoord[i][2] = r * invW; |
| texcoord[i][3] = q * invW; |
| lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, |
| dqdx, dqdy, texW, texH, |
| s, t, q, invW); |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| q += dqdx; |
| w += dwdx; |
| } |
| } |
| else { |
| /* tex.c */ |
| for (i = 0; i < span->end; i++) { |
| const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
| lambda[i] = _swrast_compute_lambda(dsdx, dsdy, dtdx, dtdy, |
| dqdx, dqdy, texW, texH, |
| s, t, q, invQ); |
| texcoord[i][0] = s * invQ; |
| texcoord[i][1] = t * invQ; |
| texcoord[i][2] = r * invQ; |
| texcoord[i][3] = q; |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| q += dqdx; |
| } |
| } |
| span->arrayMask |= SPAN_LAMBDA; |
| } |
| else { |
| /* just texture 0, without lambda */ |
| GLfloat (*texcoord)[4] = span->array->texcoords[0]; |
| const GLfloat dsdx = span->texStepX[0][0]; |
| const GLfloat dtdx = span->texStepX[0][1]; |
| const GLfloat drdx = span->texStepX[0][2]; |
| const GLfloat dqdx = span->texStepX[0][3]; |
| GLfloat s = span->tex[0][0]; |
| GLfloat t = span->tex[0][1]; |
| GLfloat r = span->tex[0][2]; |
| GLfloat q = span->tex[0][3]; |
| GLuint i; |
| if (ctx->FragmentProgram._Enabled || ctx->ATIFragmentShader._Enabled || |
| ctx->ShaderObjects._FragmentShaderPresent) { |
| /* do perspective correction but don't divide s, t, r by q */ |
| const GLfloat dwdx = span->dwdx; |
| GLfloat w = span->w; |
| for (i = 0; i < span->end; i++) { |
| const GLfloat invW = 1.0F / w; |
| texcoord[i][0] = s * invW; |
| texcoord[i][1] = t * invW; |
| texcoord[i][2] = r * invW; |
| texcoord[i][3] = q * invW; |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| q += dqdx; |
| w += dwdx; |
| } |
| } |
| else if (dqdx == 0.0F) { |
| /* Ortho projection or polygon's parallel to window X axis */ |
| const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
| for (i = 0; i < span->end; i++) { |
| texcoord[i][0] = s * invQ; |
| texcoord[i][1] = t * invQ; |
| texcoord[i][2] = r * invQ; |
| texcoord[i][3] = q; |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| } |
| } |
| else { |
| for (i = 0; i < span->end; i++) { |
| const GLfloat invQ = (q == 0.0F) ? 1.0F : (1.0F / q); |
| texcoord[i][0] = s * invQ; |
| texcoord[i][1] = t * invQ; |
| texcoord[i][2] = r * invQ; |
| texcoord[i][3] = q; |
| s += dsdx; |
| t += dtdx; |
| r += drdx; |
| q += dqdx; |
| } |
| } |
| } |
| } |
| } |
| |
| |
| /** |
| * Fill in the span.varying array from the interpolation values. |
| */ |
| static void |
| interpolate_varying(GLcontext *ctx, SWspan *span) |
| { |
| GLuint i, j; |
| |
| ASSERT(span->interpMask & SPAN_VARYING); |
| ASSERT(!(span->arrayMask & SPAN_VARYING)); |
| |
| span->arrayMask |= SPAN_VARYING; |
| |
| for (i = 0; i < MAX_VARYING_VECTORS; i++) { |
| for (j = 0; j < VARYINGS_PER_VECTOR; j++) { |
| const GLfloat dvdx = span->varStepX[i][j]; |
| GLfloat v = span->var[i][j]; |
| const GLfloat dwdx = span->dwdx; |
| GLfloat w = span->w; |
| GLuint k; |
| |
| for (k = 0; k < span->end; k++) { |
| GLfloat invW = 1.0f / w; |
| span->array->varying[k][i][j] = v * invW; |
| v += dvdx; |
| w += dwdx; |
| } |
| } |
| } |
| } |
| |
| |
| /** |
| * Apply the current polygon stipple pattern to a span of pixels. |
| */ |
| static void |
| stipple_polygon_span( GLcontext *ctx, SWspan *span ) |
| { |
| const GLuint highbit = 0x80000000; |
| const GLuint stipple = ctx->PolygonStipple[span->y % 32]; |
| GLubyte *mask = span->array->mask; |
| GLuint i, m; |
| |
| ASSERT(ctx->Polygon.StippleFlag); |
| ASSERT((span->arrayMask & SPAN_XY) == 0); |
| |
| m = highbit >> (GLuint) (span->x % 32); |
| |
| for (i = 0; i < span->end; i++) { |
| if ((m & stipple) == 0) { |
| mask[i] = 0; |
| } |
| m = m >> 1; |
| if (m == 0) { |
| m = highbit; |
| } |
| } |
| span->writeAll = GL_FALSE; |
| } |
| |
| |
| /** |
| * Clip a pixel span to the current buffer/window boundaries: |
| * DrawBuffer->_Xmin, _Xmax, _Ymin, _Ymax. This will accomplish |
| * window clipping and scissoring. |
| * Return: GL_TRUE some pixels still visible |
| * GL_FALSE nothing visible |
| */ |
| static GLuint |
| clip_span( GLcontext *ctx, SWspan *span ) |
| { |
| const GLint xmin = ctx->DrawBuffer->_Xmin; |
| const GLint xmax = ctx->DrawBuffer->_Xmax; |
| const GLint ymin = ctx->DrawBuffer->_Ymin; |
| const GLint ymax = ctx->DrawBuffer->_Ymax; |
| |
| if (span->arrayMask & SPAN_XY) { |
| /* arrays of x/y pixel coords */ |
| const GLint *x = span->array->x; |
| const GLint *y = span->array->y; |
| const GLint n = span->end; |
| GLubyte *mask = span->array->mask; |
| GLint i; |
| if (span->arrayMask & SPAN_MASK) { |
| /* note: using & intead of && to reduce branches */ |
| for (i = 0; i < n; i++) { |
| mask[i] &= (x[i] >= xmin) & (x[i] < xmax) |
| & (y[i] >= ymin) & (y[i] < ymax); |
| } |
| } |
| else { |
| /* note: using & intead of && to reduce branches */ |
| for (i = 0; i < n; i++) { |
| mask[i] = (x[i] >= xmin) & (x[i] < xmax) |
| & (y[i] >= ymin) & (y[i] < ymax); |
| } |
| } |
| return GL_TRUE; /* some pixels visible */ |
| } |
| else { |
| /* horizontal span of pixels */ |
| const GLint x = span->x; |
| const GLint y = span->y; |
| const GLint n = span->end; |
| |
| /* Trivial rejection tests */ |
| if (y < ymin || y >= ymax || x + n <= xmin || x >= xmax) { |
| span->end = 0; |
| return GL_FALSE; /* all pixels clipped */ |
| } |
| |
| /* Clip to the left */ |
| if (x < xmin) { |
| ASSERT(x + n > xmin); |
| span->writeAll = GL_FALSE; |
| _mesa_bzero(span->array->mask, (xmin - x) * sizeof(GLubyte)); |
| } |
| |
| /* Clip to right */ |
| if (x + n > xmax) { |
| ASSERT(x < xmax); |
| span->end = xmax - x; |
| } |
| |
| return GL_TRUE; /* some pixels visible */ |
| } |
| } |
| |
| |
| /** |
| * Apply all the per-fragment opertions to a span of color index fragments |
| * and write them to the enabled color drawbuffers. |
| * The 'span' parameter can be considered to be const. Note that |
| * span->interpMask and span->arrayMask may be changed but will be restored |
| * to their original values before returning. |
| */ |
| void |
| _swrast_write_index_span( GLcontext *ctx, SWspan *span) |
| { |
| const SWcontext *swrast = SWRAST_CONTEXT(ctx); |
| const GLbitfield origInterpMask = span->interpMask; |
| const GLbitfield origArrayMask = span->arrayMask; |
| |
| ASSERT(span->end <= MAX_WIDTH); |
| ASSERT(span->primitive == GL_POINT || span->primitive == GL_LINE || |
| span->primitive == GL_POLYGON || span->primitive == GL_BITMAP); |
| ASSERT((span->interpMask | span->arrayMask) & SPAN_INDEX); |
| ASSERT((span->interpMask & span->arrayMask) == 0); |
| |
| if (span->arrayMask & SPAN_MASK) { |
| /* mask was initialized by caller, probably glBitmap */ |
| span->writeAll = GL_FALSE; |
| } |
| else { |
| _mesa_memset(span->array->mask, 1, span->end); |
| span->writeAll = GL_TRUE; |
| } |
| |
| /* Clipping */ |
| if ((swrast->_RasterMask & CLIP_BIT) || (span->primitive != GL_POLYGON)) { |
| if (!clip_span(ctx, span)) { |
| return; |
| } |
| } |
| |
| /* Depth bounds test */ |
| if (ctx->Depth.BoundsTest && ctx->DrawBuffer->Visual.depthBits > 0) { |
| if (!_swrast_depth_bounds_test(ctx, span)) { |
| return; |
| } |
| } |
| |
| #ifdef DEBUG |
| /* Make sure all fragments are within window bounds */ |
| if (span->arrayMask & SPAN_XY) { |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| if (span->array->mask[i]) { |
| assert(span->array->x[i] >= ctx->DrawBuffer->_Xmin); |
| assert(span->array->x[i] < ctx->DrawBuffer->_Xmax); |
| assert(span->array->y[i] >= ctx->DrawBuffer->_Ymin); |
| assert(span->array->y[i] < ctx->DrawBuffer->_Ymax); |
| } |
| } |
| } |
| #endif |
| |
| /* Polygon Stippling */ |
| if (ctx->Polygon.StippleFlag && span->primitive == GL_POLYGON) { |
| stipple_polygon_span(ctx, span); |
| } |
| |
| /* Stencil and Z testing */ |
| if (ctx->Depth.Test || ctx->Stencil.Enabled) { |
| if (span->interpMask & SPAN_Z) |
| _swrast_span_interpolate_z(ctx, span); |
| |
| if (ctx->Stencil.Enabled) { |
| if (!_swrast_stencil_and_ztest_span(ctx, span)) { |
| span->arrayMask = origArrayMask; |
| return; |
| } |
| } |
| else { |
| ASSERT(ctx->Depth.Test); |
| if (!_swrast_depth_test_span(ctx, span)) { |
| span->interpMask = origInterpMask; |
| span->arrayMask = origArrayMask; |
| return; |
| } |
| } |
| } |
| |
| #if FEATURE_ARB_occlusion_query |
| if (ctx->Query.CurrentOcclusionObject) { |
| /* update count of 'passed' fragments */ |
| struct gl_query_object *q = ctx->Query.CurrentOcclusionObject; |
| GLuint i; |
| for (i = 0; i < span->end; i++) |
| q->Result += span->array->mask[i]; |
| } |
| #endif |
| |
| /* we have to wait until after occlusion to do this test */ |
| if (ctx->Color.DrawBuffer == GL_NONE || ctx->Color.IndexMask == 0) { |
| /* write no pixels */ |
| span->arrayMask = origArrayMask; |
| return; |
| } |
| |
| /* Interpolate the color indexes if needed */ |
| if (swrast->_FogEnabled || |
| ctx->Color.IndexLogicOpEnabled || |
| ctx->Color.IndexMask != 0xffffffff || |
| (span->arrayMask & SPAN_COVERAGE)) { |
| if (span->interpMask & SPAN_INDEX) { |
| interpolate_indexes(ctx, span); |
| } |
| } |
| |
| /* Fog */ |
| if (swrast->_FogEnabled) { |
| _swrast_fog_ci_span(ctx, span); |
| } |
| |
| /* Antialias coverage application */ |
| if (span->arrayMask & SPAN_COVERAGE) { |
| const GLfloat *coverage = span->array->coverage; |
| GLuint *index = span->array->index; |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| ASSERT(coverage[i] < 16); |
| index[i] = (index[i] & ~0xf) | ((GLuint) coverage[i]); |
| } |
| } |
| |
| /* |
| * Write to renderbuffers |
| */ |
| { |
| struct gl_framebuffer *fb = ctx->DrawBuffer; |
| const GLuint output = 0; /* only frag progs can write to other outputs */ |
| const GLuint numDrawBuffers = fb->_NumColorDrawBuffers[output]; |
| GLuint indexSave[MAX_WIDTH]; |
| GLuint buf; |
| |
| if (numDrawBuffers > 1) { |
| /* save indexes for second, third renderbuffer writes */ |
| _mesa_memcpy(indexSave, span->array->index, |
| span->end * sizeof(indexSave[0])); |
| } |
| |
| for (buf = 0; buf < fb->_NumColorDrawBuffers[output]; buf++) { |
| struct gl_renderbuffer *rb = fb->_ColorDrawBuffers[output][buf]; |
| ASSERT(rb->_BaseFormat == GL_COLOR_INDEX); |
| |
| if (ctx->Color.IndexLogicOpEnabled) { |
| _swrast_logicop_ci_span(ctx, rb, span); |
| } |
| |
| if (ctx->Color.IndexMask != 0xffffffff) { |
| _swrast_mask_ci_span(ctx, rb, span); |
| } |
| |
| if ((span->interpMask & SPAN_INDEX) && span->indexStep == 0) { |
| /* all fragments have same color index */ |
| GLubyte index8; |
| GLushort index16; |
| GLuint index32; |
| void *value; |
| |
| if (rb->DataType == GL_UNSIGNED_BYTE) { |
| index8 = FixedToInt(span->index); |
| value = &index8; |
| } |
| else if (rb->DataType == GL_UNSIGNED_SHORT) { |
| index16 = FixedToInt(span->index); |
| value = &index16; |
| } |
| else { |
| ASSERT(rb->DataType == GL_UNSIGNED_INT); |
| index32 = FixedToInt(span->index); |
| value = &index32; |
| } |
| |
| if (span->arrayMask & SPAN_XY) { |
| rb->PutMonoValues(ctx, rb, span->end, span->array->x, |
| span->array->y, value, span->array->mask); |
| } |
| else { |
| rb->PutMonoRow(ctx, rb, span->end, span->x, span->y, |
| value, span->array->mask); |
| } |
| } |
| else { |
| /* each fragment is a different color */ |
| GLubyte index8[MAX_WIDTH]; |
| GLushort index16[MAX_WIDTH]; |
| void *values; |
| |
| if (rb->DataType == GL_UNSIGNED_BYTE) { |
| GLuint k; |
| for (k = 0; k < span->end; k++) { |
| index8[k] = (GLubyte) span->array->index[k]; |
| } |
| values = index8; |
| } |
| else if (rb->DataType == GL_UNSIGNED_SHORT) { |
| GLuint k; |
| for (k = 0; k < span->end; k++) { |
| index16[k] = (GLushort) span->array->index[k]; |
| } |
| values = index16; |
| } |
| else { |
| ASSERT(rb->DataType == GL_UNSIGNED_INT); |
| values = span->array->index; |
| } |
| |
| if (span->arrayMask & SPAN_XY) { |
| rb->PutValues(ctx, rb, span->end, |
| span->array->x, span->array->y, |
| values, span->array->mask); |
| } |
| else { |
| rb->PutRow(ctx, rb, span->end, span->x, span->y, |
| values, span->array->mask); |
| } |
| } |
| |
| if (buf + 1 < numDrawBuffers) { |
| /* restore original span values */ |
| _mesa_memcpy(span->array->index, indexSave, |
| span->end * sizeof(indexSave[0])); |
| } |
| } /* for buf */ |
| } |
| |
| span->interpMask = origInterpMask; |
| span->arrayMask = origArrayMask; |
| } |
| |
| |
| /** |
| * Add specular color to base color. This is used only when |
| * GL_LIGHT_MODEL_COLOR_CONTROL = GL_SEPARATE_SPECULAR_COLOR. |
| */ |
| static void |
| add_specular(GLcontext *ctx, SWspan *span) |
| { |
| switch (span->array->ChanType) { |
| case GL_UNSIGNED_BYTE: |
| { |
| GLubyte (*rgba)[4] = span->array->color.sz1.rgba; |
| GLubyte (*spec)[4] = span->array->color.sz1.spec; |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| GLint r = rgba[i][RCOMP] + spec[i][RCOMP]; |
| GLint g = rgba[i][GCOMP] + spec[i][GCOMP]; |
| GLint b = rgba[i][BCOMP] + spec[i][BCOMP]; |
| GLint a = rgba[i][ACOMP] + spec[i][ACOMP]; |
| rgba[i][RCOMP] = MIN2(r, 255); |
| rgba[i][GCOMP] = MIN2(g, 255); |
| rgba[i][BCOMP] = MIN2(b, 255); |
| rgba[i][ACOMP] = MIN2(a, 255); |
| } |
| } |
| break; |
| case GL_UNSIGNED_SHORT: |
| { |
| GLushort (*rgba)[4] = span->array->color.sz2.rgba; |
| GLushort (*spec)[4] = span->array->color.sz2.spec; |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| GLint r = rgba[i][RCOMP] + spec[i][RCOMP]; |
| GLint g = rgba[i][GCOMP] + spec[i][GCOMP]; |
| GLint b = rgba[i][BCOMP] + spec[i][BCOMP]; |
| GLint a = rgba[i][ACOMP] + spec[i][ACOMP]; |
| rgba[i][RCOMP] = MIN2(r, 65535); |
| rgba[i][GCOMP] = MIN2(g, 65535); |
| rgba[i][BCOMP] = MIN2(b, 65535); |
| rgba[i][ACOMP] = MIN2(a, 65535); |
| } |
| } |
| break; |
| case GL_FLOAT: |
| { |
| GLfloat (*rgba)[4] = span->array->color.sz4.rgba; |
| GLfloat (*spec)[4] = span->array->color.sz4.spec; |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| rgba[i][RCOMP] += spec[i][RCOMP]; |
| rgba[i][GCOMP] += spec[i][GCOMP]; |
| rgba[i][BCOMP] += spec[i][BCOMP]; |
| rgba[i][ACOMP] += spec[i][ACOMP]; |
| } |
| } |
| break; |
| default: |
| _mesa_problem(ctx, "Invalid datatype in add_specular"); |
| } |
| } |
| |
| |
| /** |
| * Apply antialiasing coverage value to alpha values. |
| */ |
| static void |
| apply_aa_coverage(SWspan *span) |
| { |
| const GLfloat *coverage = span->array->coverage; |
| GLuint i; |
| if (span->array->ChanType == GL_UNSIGNED_BYTE) { |
| GLubyte (*rgba)[4] = span->array->color.sz1.rgba; |
| for (i = 0; i < span->end; i++) { |
| const GLfloat a = rgba[i][ACOMP] * coverage[i]; |
| rgba[i][ACOMP] = (GLubyte) CLAMP(a, 0.0, 255.0); |
| ASSERT(coverage[i] >= 0.0); |
| ASSERT(coverage[i] <= 1.0); |
| } |
| } |
| else if (span->array->ChanType == GL_UNSIGNED_SHORT) { |
| GLushort (*rgba)[4] = span->array->color.sz2.rgba; |
| for (i = 0; i < span->end; i++) { |
| const GLfloat a = rgba[i][ACOMP] * coverage[i]; |
| rgba[i][ACOMP] = (GLushort) CLAMP(a, 0.0, 65535.0); |
| } |
| } |
| else { |
| GLfloat (*rgba)[4] = span->array->color.sz4.rgba; |
| for (i = 0; i < span->end; i++) { |
| rgba[i][ACOMP] = rgba[i][ACOMP] * coverage[i]; |
| } |
| } |
| } |
| |
| |
| /** |
| * Convert the span's color arrays to the given type. |
| * XXX this could be put into image.c and reused in several places. |
| */ |
| static void |
| convert_color_type(GLcontext *ctx, SWspan *span, GLenum newType) |
| { |
| GLvoid *src, *dst; |
| if (span->array->ChanType == GL_UNSIGNED_BYTE) { |
| src = span->array->color.sz1.rgba; |
| } |
| else if (span->array->ChanType == GL_UNSIGNED_BYTE) { |
| src = span->array->color.sz2.rgba; |
| } |
| else { |
| src = span->array->color.sz4.rgba; |
| } |
| if (newType == GL_UNSIGNED_BYTE) { |
| dst = span->array->color.sz1.rgba; |
| } |
| else if (newType == GL_UNSIGNED_BYTE) { |
| dst = span->array->color.sz2.rgba; |
| } |
| else { |
| dst = span->array->color.sz4.rgba; |
| } |
| |
| _mesa_convert_colors(span->array->ChanType, src, |
| newType, dst, |
| span->end, span->array->mask); |
| |
| span->array->ChanType = newType; |
| } |
| |
| |
| |
| /** |
| * Apply all the per-fragment operations to a span. |
| * This now includes texturing (_swrast_write_texture_span() is history). |
| * This function may modify any of the array values in the span. |
| * span->interpMask and span->arrayMask may be changed but will be restored |
| * to their original values before returning. |
| */ |
| void |
| _swrast_write_rgba_span( GLcontext *ctx, SWspan *span) |
| { |
| const GLuint colorMask = *((GLuint *) ctx->Color.ColorMask); |
| SWcontext *swrast = SWRAST_CONTEXT(ctx); |
| const GLbitfield origInterpMask = span->interpMask; |
| const GLbitfield origArrayMask = span->arrayMask; |
| const GLenum chanType = span->array->ChanType; |
| const GLboolean deferredTexture = !(ctx->Color.AlphaEnabled || |
| ctx->FragmentProgram._Enabled || |
| ctx->ShaderObjects._FragmentShaderPresent); |
| |
| ASSERT(span->primitive == GL_POINT || span->primitive == GL_LINE || |
| span->primitive == GL_POLYGON || span->primitive == GL_BITMAP); |
| ASSERT(span->end <= MAX_WIDTH); |
| ASSERT((span->interpMask & span->arrayMask) == 0); |
| |
| /* |
| printf("%s() interp 0x%x array 0x%x\n", __FUNCTION__, |
| span->interpMask, span->arrayMask); |
| */ |
| |
| if (span->arrayMask & SPAN_MASK) { |
| /* mask was initialized by caller, probably glBitmap */ |
| span->writeAll = GL_FALSE; |
| } |
| else { |
| _mesa_memset(span->array->mask, 1, span->end); |
| span->writeAll = GL_TRUE; |
| } |
| |
| /* Clip to window/scissor box */ |
| if ((swrast->_RasterMask & CLIP_BIT) || (span->primitive != GL_POLYGON)) { |
| if (!clip_span(ctx, span)) { |
| return; |
| } |
| } |
| |
| #ifdef DEBUG |
| /* Make sure all fragments are within window bounds */ |
| if (span->arrayMask & SPAN_XY) { |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| if (span->array->mask[i]) { |
| assert(span->array->x[i] >= ctx->DrawBuffer->_Xmin); |
| assert(span->array->x[i] < ctx->DrawBuffer->_Xmax); |
| assert(span->array->y[i] >= ctx->DrawBuffer->_Ymin); |
| assert(span->array->y[i] < ctx->DrawBuffer->_Ymax); |
| } |
| } |
| } |
| #endif |
| |
| /* Polygon Stippling */ |
| if (ctx->Polygon.StippleFlag && span->primitive == GL_POLYGON) { |
| stipple_polygon_span(ctx, span); |
| } |
| |
| /* Interpolate texcoords? */ |
| if (ctx->Texture._EnabledCoordUnits |
| && (span->interpMask & SPAN_TEXTURE) |
| && (span->arrayMask & SPAN_TEXTURE) == 0) { |
| interpolate_texcoords(ctx, span); |
| } |
| |
| if (ctx->ShaderObjects._FragmentShaderPresent) { |
| interpolate_varying(ctx, span); |
| } |
| |
| /* This is the normal place to compute the resulting fragment color/Z. |
| * As an optimization, we try to defer this until after Z/stencil |
| * testing in order to try to avoid computing colors that we won't |
| * actually need. |
| */ |
| if (!deferredTexture) { |
| /* Now we need the rgba array, fill it in if needed */ |
| if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0) |
| interpolate_colors(span); |
| |
| if (span->interpMask & SPAN_SPEC) |
| interpolate_specular(span); |
| |
| if (span->interpMask & SPAN_FOG) |
| interpolate_fog(ctx, span); |
| |
| /* use float colors if running a fragment program or shader */ |
| if (ctx->ShaderObjects._FragmentShaderPresent || |
| ctx->FragmentProgram._Enabled || |
| ctx->ATIFragmentShader._Enabled) { |
| const GLenum oldType = span->array->ChanType; |
| /* work with float colors */ |
| if (oldType != GL_FLOAT) { |
| GLvoid *src = (oldType == GL_UNSIGNED_BYTE) |
| ? (GLvoid *) span->array->color.sz1.rgba |
| : (GLvoid *) span->array->color.sz2.rgba; |
| _mesa_convert_colors(oldType, src, |
| GL_FLOAT, span->array->color.sz4.rgba, |
| span->end, span->array->mask); |
| span->array->ChanType = GL_FLOAT; |
| } |
| } |
| |
| /* Compute fragment colors with fragment program or texture lookups */ |
| #if FEATURE_ARB_fragment_shader |
| if (ctx->ShaderObjects._FragmentShaderPresent) { |
| if (span->interpMask & SPAN_Z) |
| _swrast_span_interpolate_z (ctx, span); |
| _swrast_exec_arbshader (ctx, span); |
| } |
| else |
| #endif |
| if (ctx->FragmentProgram._Enabled) { |
| /* frag prog may need Z values */ |
| if (span->interpMask & SPAN_Z) |
| _swrast_span_interpolate_z(ctx, span); |
| _swrast_exec_fragment_program( ctx, span ); |
| } |
| else if (ctx->ATIFragmentShader._Enabled) |
| _swrast_exec_fragment_shader( ctx, span ); |
| else if (ctx->Texture._EnabledUnits && (span->arrayMask & SPAN_TEXTURE)) |
| _swrast_texture_span( ctx, span ); |
| |
| /* Do the alpha test */ |
| if (ctx->Color.AlphaEnabled) { |
| if (!_swrast_alpha_test(ctx, span)) { |
| goto end; |
| } |
| } |
| } |
| |
| /* Stencil and Z testing */ |
| if (ctx->Stencil.Enabled || ctx->Depth.Test) { |
| if (span->interpMask & SPAN_Z) |
| _swrast_span_interpolate_z(ctx, span); |
| |
| if (ctx->Stencil.Enabled && ctx->DrawBuffer->Visual.stencilBits > 0) { |
| /* Combined Z/stencil tests */ |
| if (!_swrast_stencil_and_ztest_span(ctx, span)) { |
| goto end; |
| } |
| } |
| else if (ctx->DrawBuffer->Visual.depthBits > 0) { |
| /* Just regular depth testing */ |
| ASSERT(ctx->Depth.Test); |
| ASSERT(span->arrayMask & SPAN_Z); |
| if (!_swrast_depth_test_span(ctx, span)) { |
| goto end; |
| } |
| } |
| } |
| |
| #if FEATURE_ARB_occlusion_query |
| if (ctx->Query.CurrentOcclusionObject) { |
| /* update count of 'passed' fragments */ |
| struct gl_query_object *q = ctx->Query.CurrentOcclusionObject; |
| GLuint i; |
| for (i = 0; i < span->end; i++) |
| q->Result += span->array->mask[i]; |
| } |
| #endif |
| |
| /* We had to wait until now to check for glColorMask(0,0,0,0) because of |
| * the occlusion test. |
| */ |
| if (colorMask == 0x0) { |
| goto end; |
| } |
| |
| /* If we were able to defer fragment color computation to now, there's |
| * a good chance that many fragments will have already been killed by |
| * Z/stencil testing. |
| */ |
| if (deferredTexture) { |
| /* Now we need the rgba array, fill it in if needed */ |
| if ((span->interpMask & SPAN_RGBA) && (span->arrayMask & SPAN_RGBA) == 0) |
| interpolate_colors(span); |
| |
| if (span->interpMask & SPAN_SPEC) |
| interpolate_specular(span); |
| |
| if (span->interpMask & SPAN_FOG) |
| interpolate_fog(ctx, span); |
| |
| #if FEATURE_ARB_fragment_shader |
| if (ctx->ShaderObjects._FragmentShaderPresent) { |
| if (span->interpMask & SPAN_Z) |
| _swrast_span_interpolate_z (ctx, span); |
| _swrast_exec_arbshader (ctx, span); |
| } |
| else |
| #endif |
| if (ctx->FragmentProgram._Enabled) |
| _swrast_exec_fragment_program( ctx, span ); |
| else if (ctx->ATIFragmentShader._Enabled) |
| _swrast_exec_fragment_shader( ctx, span ); |
| else if (ctx->Texture._EnabledUnits && (span->arrayMask & SPAN_TEXTURE)) |
| _swrast_texture_span( ctx, span ); |
| } |
| |
| ASSERT(span->arrayMask & SPAN_RGBA); |
| |
| if (!ctx->FragmentProgram._Enabled) { |
| /* Add base and specular colors */ |
| if (ctx->Fog.ColorSumEnabled || |
| (ctx->Light.Enabled && |
| ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) { |
| if (span->interpMask & SPAN_SPEC) { |
| interpolate_specular(span); |
| } |
| if (span->arrayMask & SPAN_SPEC) { |
| add_specular(ctx, span); |
| } |
| else { |
| /* We probably added the base/specular colors during the |
| * vertex stage! |
| */ |
| } |
| } |
| } |
| |
| /* Fog */ |
| if (swrast->_FogEnabled) { |
| _swrast_fog_rgba_span(ctx, span); |
| } |
| |
| /* Antialias coverage application */ |
| if (span->arrayMask & SPAN_COVERAGE) { |
| apply_aa_coverage(span); |
| } |
| |
| /* Clamp color/alpha values over the range [0.0, 1.0] before storage */ |
| #if CHAN_TYPE == GL_FLOAT |
| if (ctx->Color.ClampFragmentColor) { |
| GLchan (*rgba)[4] = span->array->rgba; |
| GLuint i; |
| for (i = 0; i < span->end; i++) { |
| rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0, CHAN_MAXF); |
| rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0, CHAN_MAXF); |
| rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0, CHAN_MAXF); |
| rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0, CHAN_MAXF); |
| } |
| } |
| #endif |
| |
| /* |
| * Write to renderbuffers |
| */ |
| { |
| struct gl_framebuffer *fb = ctx->DrawBuffer; |
| const GLuint output = 0; /* only frag progs can write to other outputs */ |
| const GLuint numDrawBuffers = fb->_NumColorDrawBuffers[output]; |
| GLchan rgbaSave[MAX_WIDTH][4]; |
| GLuint buf; |
| |
| if (numDrawBuffers > 0) { |
| if (fb->_ColorDrawBuffers[output][0]->DataType |
| != span->array->ChanType) { |
| convert_color_type(ctx, span, |
| fb->_ColorDrawBuffers[output][0]->DataType); |
| } |
| } |
| |
| if (numDrawBuffers > 1) { |
| /* save colors for second, third renderbuffer writes */ |
| _mesa_memcpy(rgbaSave, span->array->rgba, |
| 4 * span->end * sizeof(GLchan)); |
| } |
| |
| for (buf = 0; buf < numDrawBuffers; buf++) { |
| struct gl_renderbuffer *rb = fb->_ColorDrawBuffers[output][buf]; |
| ASSERT(rb->_BaseFormat == GL_RGBA || rb->_BaseFormat == GL_RGB); |
| |
| if (ctx->Color._LogicOpEnabled) { |
| _swrast_logicop_rgba_span(ctx, rb, span); |
| } |
| else if (ctx->Color.BlendEnabled) { |
| _swrast_blend_span(ctx, rb, span); |
| } |
| |
| if (colorMask != 0xffffffff) { |
| _swrast_mask_rgba_span(ctx, rb, span); |
| } |
| |
| if (span->arrayMask & SPAN_XY) { |
| /* array of pixel coords */ |
| ASSERT(rb->PutValues); |
| rb->PutValues(ctx, rb, span->end, |
| span->array->x, span->array->y, |
| span->array->rgba, span->array->mask); |
| } |
| else { |
| /* horizontal run of pixels */ |
| ASSERT(rb->PutRow); |
| rb->PutRow(ctx, rb, span->end, span->x, span->y, span->array->rgba, |
| span->writeAll ? NULL: span->array->mask); |
| } |
| |
| if (buf + 1 < numDrawBuffers) { |
| /* restore original span values */ |
| _mesa_memcpy(span->array->rgba, rgbaSave, |
| 4 * span->end * sizeof(GLchan)); |
| } |
| } /* for buf */ |
| |
| } |
| |
| end: |
| span->interpMask = origInterpMask; |
| span->arrayMask = origArrayMask; |
| span->array->ChanType = chanType; /* restore */ |
| } |
| |
| |
| /** |
| * Read RGBA pixels from frame buffer. Clipping will be done to prevent |
| * reading ouside the buffer's boundaries. |
| * \param type datatype for returned colors |
| * \param rgba the returned colors |
| */ |
| void |
| _swrast_read_rgba_span( GLcontext *ctx, struct gl_renderbuffer *rb, |
| GLuint n, GLint x, GLint y, GLenum dstType, |
| GLvoid *rgba) |
| { |
| const GLint bufWidth = (GLint) rb->Width; |
| const GLint bufHeight = (GLint) rb->Height; |
| |
| if (y < 0 || y >= bufHeight || x + (GLint) n < 0 || x >= bufWidth) { |
| /* completely above, below, or right */ |
| /* XXX maybe leave rgba values undefined? */ |
| _mesa_bzero(rgba, 4 * n * sizeof(GLchan)); |
| } |
| else { |
| GLint skip, length; |
| if (x < 0) { |
| /* left edge clipping */ |
| skip = -x; |
| length = (GLint) n - skip; |
| if (length < 0) { |
| /* completely left of window */ |
| return; |
| } |
| if (length > bufWidth) { |
| length = bufWidth; |
| } |
| } |
| else if ((GLint) (x + n) > bufWidth) { |
| /* right edge clipping */ |
| skip = 0; |
| length = bufWidth - x; |
| if (length < 0) { |
| /* completely to right of window */ |
| return; |
| } |
| } |
| else { |
| /* no clipping */ |
| skip = 0; |
| length = (GLint) n; |
| } |
| |
| ASSERT(rb); |
| ASSERT(rb->GetRow); |
| ASSERT(rb->_BaseFormat == GL_RGB || rb->_BaseFormat == GL_RGBA); |
| |
| if (rb->DataType == dstType) { |
| rb->GetRow(ctx, rb, length, x + skip, y, |
| (GLubyte *) rgba + skip * RGBA_PIXEL_SIZE(rb->DataType)); |
| } |
| else { |
| GLuint temp[MAX_WIDTH * 4]; |
| rb->GetRow(ctx, rb, length, x + skip, y, temp); |
| _mesa_convert_colors(rb->DataType, temp, |
| dstType, (GLubyte *) rgba + skip * RGBA_PIXEL_SIZE(dstType), |
| length, NULL); |
| } |
| } |
| } |
| |
| |
| /** |
| * Read CI pixels from frame buffer. Clipping will be done to prevent |
| * reading ouside the buffer's boundaries. |
| */ |
| void |
| _swrast_read_index_span( GLcontext *ctx, struct gl_renderbuffer *rb, |
| GLuint n, GLint x, GLint y, GLuint index[] ) |
| { |
| const GLint bufWidth = (GLint) rb->Width; |
| const GLint bufHeight = (GLint) rb->Height; |
| |
| if (y < 0 || y >= bufHeight || x + (GLint) n < 0 || x >= bufWidth) { |
| /* completely above, below, or right */ |
| _mesa_bzero(index, n * sizeof(GLuint)); |
| } |
| else { |
| GLint skip, length; |
| if (x < 0) { |
| /* left edge clipping */ |
| skip = -x; |
| length = (GLint) n - skip; |
| if (length < 0) { |
| /* completely left of window */ |
| return; |
| } |
| if (length > bufWidth) { |
| length = bufWidth; |
| } |
| } |
| else if ((GLint) (x + n) > bufWidth) { |
| /* right edge clipping */ |
| skip = 0; |
| length = bufWidth - x; |
| if (length < 0) { |
| /* completely to right of window */ |
| return; |
| } |
| } |
| else { |
| /* no clipping */ |
| skip = 0; |
| length = (GLint) n; |
| } |
| |
| ASSERT(rb->GetRow); |
| ASSERT(rb->_BaseFormat == GL_COLOR_INDEX); |
| |
| if (rb->DataType == GL_UNSIGNED_BYTE) { |
| GLubyte index8[MAX_WIDTH]; |
| GLint i; |
| rb->GetRow(ctx, rb, length, x + skip, y, index8); |
| for (i = 0; i < length; i++) |
| index[skip + i] = index8[i]; |
| } |
| else if (rb->DataType == GL_UNSIGNED_SHORT) { |
| GLushort index16[MAX_WIDTH]; |
| GLint i; |
| rb->GetRow(ctx, rb, length, x + skip, y, index16); |
| for (i = 0; i < length; i++) |
| index[skip + i] = index16[i]; |
| } |
| else if (rb->DataType == GL_UNSIGNED_INT) { |
| rb->GetRow(ctx, rb, length, x + skip, y, index + skip); |
| } |
| } |
| } |
| |
| |
| /** |
| * Wrapper for gl_renderbuffer::GetValues() which does clipping to avoid |
| * reading values outside the buffer bounds. |
| * We can use this for reading any format/type of renderbuffer. |
| * \param valueSize is the size in bytes of each value (pixel) put into the |
| * values array. |
| */ |
| void |
| _swrast_get_values(GLcontext *ctx, struct gl_renderbuffer *rb, |
| GLuint count, const GLint x[], const GLint y[], |
| void *values, GLuint valueSize) |
| { |
| GLuint i, inCount = 0, inStart = 0; |
| |
| for (i = 0; i < count; i++) { |
| if (x[i] >= 0 && y[i] >= 0 && x[i] < rb->Width && y[i] < rb->Height) { |
| /* inside */ |
| if (inCount == 0) |
| inStart = i; |
| inCount++; |
| } |
| else { |
| if (inCount > 0) { |
| /* read [inStart, inStart + inCount) */ |
| rb->GetValues(ctx, rb, inCount, x + inStart, y + inStart, |
| (GLubyte *) values + inStart * valueSize); |
| inCount = 0; |
| } |
| } |
| } |
| if (inCount > 0) { |
| /* read last values */ |
| rb->GetValues(ctx, rb, inCount, x + inStart, y + inStart, |
| (GLubyte *) values + inStart * valueSize); |
| } |
| } |
| |
| |
| /** |
| * Wrapper for gl_renderbuffer::PutRow() which does clipping. |
| * \param valueSize size of each value (pixel) in bytes |
| */ |
| void |
| _swrast_put_row(GLcontext *ctx, struct gl_renderbuffer *rb, |
| GLuint count, GLint x, GLint y, |
| const GLvoid *values, GLuint valueSize) |
| { |
| GLint skip = 0; |
| |
| if (y < 0 || y >= rb->Height) |
| return; /* above or below */ |
| |
| if (x + (GLint) count <= 0 || x >= rb->Width) |
| return; /* entirely left or right */ |
| |
| if (x + count > rb->Width) { |
| /* right clip */ |
| GLint clip = x + count - rb->Width; |
| count -= clip; |
| } |
| |
| if (x < 0) { |
| /* left clip */ |
| skip = -x; |
| x = 0; |
| count -= skip; |
| } |
| |
| rb->PutRow(ctx, rb, count, x, y, |
| (const GLubyte *) values + skip * valueSize, NULL); |
| } |
| |
| |
| /** |
| * Wrapper for gl_renderbuffer::GetRow() which does clipping. |
| * \param valueSize size of each value (pixel) in bytes |
| */ |
| void |
| _swrast_get_row(GLcontext *ctx, struct gl_renderbuffer *rb, |
| GLuint count, GLint x, GLint y, |
| GLvoid *values, GLuint valueSize) |
| { |
| GLint skip = 0; |
| |
| if (y < 0 || y >= rb->Height) |
| return; /* above or below */ |
| |
| if (x + (GLint) count <= 0 || x >= rb->Width) |
| return; /* entirely left or right */ |
| |
| if (x + count > rb->Width) { |
| /* right clip */ |
| GLint clip = x + count - rb->Width; |
| count -= clip; |
| } |
| |
| if (x < 0) { |
| /* left clip */ |
| skip = -x; |
| x = 0; |
| count -= skip; |
| } |
| |
| rb->GetRow(ctx, rb, count, x, y, (GLubyte *) values + skip * valueSize); |
| } |
| |
| |
| /** |
| * Get RGBA pixels from the given renderbuffer. Put the pixel colors into |
| * the span's specular color arrays. The specular color arrays should no |
| * longer be needed by time this function is called. |
| * Used by blending, logicop and masking functions. |
| * \return pointer to the colors we read. |
| */ |
| void * |
| _swrast_get_dest_rgba(GLcontext *ctx, struct gl_renderbuffer *rb, |
| SWspan *span) |
| { |
| const GLuint pixelSize = RGBA_PIXEL_SIZE(span->array->ChanType); |
| void *rbPixels; |
| |
| /* |
| * Determine pixel size (in bytes). |
| * Point rbPixels to a temporary space (use specular color arrays). |
| */ |
| if (span->array->ChanType == GL_UNSIGNED_BYTE) { |
| rbPixels = span->array->color.sz1.spec; |
| } |
| else if (span->array->ChanType == GL_UNSIGNED_SHORT) { |
| rbPixels = span->array->color.sz2.spec; |
| } |
| else { |
| rbPixels = span->array->color.sz4.spec; |
| } |
| |
| /* Get destination values from renderbuffer */ |
| if (span->arrayMask & SPAN_XY) { |
| _swrast_get_values(ctx, rb, span->end, span->array->x, span->array->y, |
| rbPixels, pixelSize); |
| } |
| else { |
| _swrast_get_row(ctx, rb, span->end, span->x, span->y, |
| rbPixels, pixelSize); |
| } |
| |
| return rbPixels; |
| } |