| /************************************************************************** |
| * |
| * Copyright 2007 VMware, Inc. |
| * 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, sub license, 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 (including the |
| * next paragraph) 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 NON-INFRINGEMENT. |
| * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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. |
| * |
| **************************************************************************/ |
| |
| /** |
| * glRasterPos implementation. Basically render a GL_POINT with our |
| * private draw module. Plug in a special "rasterpos" stage at the end |
| * of the 'draw' pipeline to capture the results and update the current |
| * raster pos attributes. |
| * |
| * Authors: |
| * Brian Paul |
| */ |
| |
| |
| #include "main/imports.h" |
| #include "main/macros.h" |
| #include "main/feedback.h" |
| #include "main/rastpos.h" |
| |
| #include "st_context.h" |
| #include "st_atom.h" |
| #include "st_draw.h" |
| #include "st_cb_rasterpos.h" |
| #include "draw/draw_context.h" |
| #include "draw/draw_pipe.h" |
| #include "vbo/vbo.h" |
| |
| |
| /** |
| * Our special drawing pipeline stage (replaces rasterization). |
| */ |
| struct rastpos_stage |
| { |
| struct draw_stage stage; /**< Base class */ |
| struct gl_context *ctx; /**< Rendering context */ |
| |
| /* vertex attrib info we can setup once and re-use */ |
| struct gl_client_array array[VERT_ATTRIB_MAX]; |
| const struct gl_client_array *arrays[VERT_ATTRIB_MAX]; |
| struct _mesa_prim prim; |
| }; |
| |
| |
| static inline struct rastpos_stage * |
| rastpos_stage( struct draw_stage *stage ) |
| { |
| return (struct rastpos_stage *) stage; |
| } |
| |
| static void |
| rastpos_flush( struct draw_stage *stage, unsigned flags ) |
| { |
| /* no-op */ |
| } |
| |
| static void |
| rastpos_reset_stipple_counter( struct draw_stage *stage ) |
| { |
| /* no-op */ |
| } |
| |
| static void |
| rastpos_tri( struct draw_stage *stage, struct prim_header *prim ) |
| { |
| /* should never get here */ |
| assert(0); |
| } |
| |
| static void |
| rastpos_line( struct draw_stage *stage, struct prim_header *prim ) |
| { |
| /* should never get here */ |
| assert(0); |
| } |
| |
| static void |
| rastpos_destroy(struct draw_stage *stage) |
| { |
| free(stage); |
| } |
| |
| |
| /** |
| * Update a raster pos attribute from the vertex result if it's present, |
| * else copy the current attrib. |
| */ |
| static void |
| update_attrib(struct gl_context *ctx, const GLuint *outputMapping, |
| const struct vertex_header *vert, |
| GLfloat *dest, |
| GLuint result, GLuint defaultAttrib) |
| { |
| const GLfloat *src; |
| const GLuint k = outputMapping[result]; |
| if (k != ~0U) |
| src = vert->data[k]; |
| else |
| src = ctx->Current.Attrib[defaultAttrib]; |
| COPY_4V(dest, src); |
| } |
| |
| |
| /** |
| * Normally, this function would render a GL_POINT. |
| */ |
| static void |
| rastpos_point(struct draw_stage *stage, struct prim_header *prim) |
| { |
| struct rastpos_stage *rs = rastpos_stage(stage); |
| struct gl_context *ctx = rs->ctx; |
| struct st_context *st = st_context(ctx); |
| const GLfloat height = (GLfloat) ctx->DrawBuffer->Height; |
| const GLuint *outputMapping = st->vertex_result_to_slot; |
| const GLfloat *pos; |
| GLuint i; |
| |
| /* if we get here, we didn't get clipped */ |
| ctx->Current.RasterPosValid = GL_TRUE; |
| |
| /* update raster pos */ |
| pos = prim->v[0]->data[0]; |
| ctx->Current.RasterPos[0] = pos[0]; |
| if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) |
| ctx->Current.RasterPos[1] = height - pos[1]; /* invert Y */ |
| else |
| ctx->Current.RasterPos[1] = pos[1]; |
| ctx->Current.RasterPos[2] = pos[2]; |
| ctx->Current.RasterPos[3] = pos[3]; |
| |
| /* update other raster attribs */ |
| update_attrib(ctx, outputMapping, prim->v[0], |
| ctx->Current.RasterColor, |
| VARYING_SLOT_COL0, VERT_ATTRIB_COLOR0); |
| |
| update_attrib(ctx, outputMapping, prim->v[0], |
| ctx->Current.RasterSecondaryColor, |
| VARYING_SLOT_COL1, VERT_ATTRIB_COLOR1); |
| |
| for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) { |
| update_attrib(ctx, outputMapping, prim->v[0], |
| ctx->Current.RasterTexCoords[i], |
| VARYING_SLOT_TEX0 + i, VERT_ATTRIB_TEX0 + i); |
| } |
| |
| if (ctx->RenderMode == GL_SELECT) { |
| _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] ); |
| } |
| } |
| |
| |
| /** |
| * Create rasterpos "drawing" stage. |
| */ |
| static struct rastpos_stage * |
| new_draw_rastpos_stage(struct gl_context *ctx, struct draw_context *draw) |
| { |
| struct rastpos_stage *rs = ST_CALLOC_STRUCT(rastpos_stage); |
| GLuint i; |
| |
| rs->stage.draw = draw; |
| rs->stage.next = NULL; |
| rs->stage.point = rastpos_point; |
| rs->stage.line = rastpos_line; |
| rs->stage.tri = rastpos_tri; |
| rs->stage.flush = rastpos_flush; |
| rs->stage.destroy = rastpos_destroy; |
| rs->stage.reset_stipple_counter = rastpos_reset_stipple_counter; |
| rs->stage.destroy = rastpos_destroy; |
| rs->ctx = ctx; |
| |
| for (i = 0; i < ARRAY_SIZE(rs->array); i++) { |
| rs->array[i].Size = 4; |
| rs->array[i].Type = GL_FLOAT; |
| rs->array[i].Format = GL_RGBA; |
| rs->array[i].StrideB = 0; |
| rs->array[i].Ptr = (GLubyte *) ctx->Current.Attrib[i]; |
| rs->array[i].Normalized = GL_TRUE; |
| rs->array[i].BufferObj = NULL; |
| rs->arrays[i] = &rs->array[i]; |
| } |
| |
| rs->prim.mode = GL_POINTS; |
| rs->prim.indexed = 0; |
| rs->prim.begin = 1; |
| rs->prim.end = 1; |
| rs->prim.weak = 0; |
| rs->prim.start = 0; |
| rs->prim.count = 1; |
| |
| return rs; |
| } |
| |
| |
| static void |
| st_RasterPos(struct gl_context *ctx, const GLfloat v[4]) |
| { |
| struct st_context *st = st_context(ctx); |
| struct draw_context *draw = st->draw; |
| struct rastpos_stage *rs; |
| const struct gl_client_array **saved_arrays = ctx->Array._DrawArrays; |
| |
| if (ctx->VertexProgram._Current == NULL || |
| ctx->VertexProgram._Current == ctx->VertexProgram._TnlProgram) { |
| /* No vertex shader/program is enabled, used the simple/fast fixed- |
| * function implementation of RasterPos. |
| */ |
| _mesa_RasterPos(ctx, v); |
| return; |
| } |
| |
| if (st->rastpos_stage) { |
| /* get rastpos stage info */ |
| rs = rastpos_stage(st->rastpos_stage); |
| } |
| else { |
| /* create rastpos draw stage */ |
| rs = new_draw_rastpos_stage(ctx, draw); |
| st->rastpos_stage = &rs->stage; |
| } |
| |
| /* plug our rastpos stage into the draw module */ |
| draw_set_rasterize_stage(st->draw, st->rastpos_stage); |
| |
| /* make sure everything's up to date */ |
| st_validate_state(st, ST_PIPELINE_RENDER); |
| |
| /* This will get set only if rastpos_point(), above, gets called */ |
| ctx->Current.RasterPosValid = GL_FALSE; |
| |
| /* All vertex attribs but position were previously initialized above. |
| * Just plug in position pointer now. |
| */ |
| rs->array[0].Ptr = (GLubyte *) v; |
| |
| /* Draw the point. |
| * |
| * Don't set DriverFlags.NewArray. |
| * st_feedback_draw_vbo doesn't check for that flag. */ |
| ctx->Array._DrawArrays = rs->arrays; |
| st_feedback_draw_vbo(ctx, &rs->prim, 1, NULL, GL_TRUE, 0, 1, |
| NULL, 0, NULL); |
| ctx->Array._DrawArrays = saved_arrays; |
| |
| /* restore draw's rasterization stage depending on rendermode */ |
| if (ctx->RenderMode == GL_FEEDBACK) { |
| draw_set_rasterize_stage(draw, st->feedback_stage); |
| } |
| else if (ctx->RenderMode == GL_SELECT) { |
| draw_set_rasterize_stage(draw, st->selection_stage); |
| } |
| } |
| |
| |
| |
| void st_init_rasterpos_functions(struct dd_function_table *functions) |
| { |
| functions->RasterPos = st_RasterPos; |
| } |