| /* |
| * Mesa 3-D graphics library |
| * Version: 7.5 |
| * |
| * Copyright (C) 2009 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, 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 |
| * THE AUTHORS OR COPYRIGHT HOLDERS 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 viewport.c |
| * glViewport and glDepthRange functions. |
| */ |
| |
| |
| #include "context.h" |
| #include "macros.h" |
| #include "mtypes.h" |
| #include "viewport.h" |
| |
| |
| /** |
| * Set the viewport. |
| * \sa Called via glViewport() or display list execution. |
| * |
| * Flushes the vertices and calls _mesa_set_viewport() with the given |
| * parameters. |
| */ |
| void GLAPIENTRY |
| _mesa_Viewport(GLint x, GLint y, GLsizei width, GLsizei height) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| FLUSH_VERTICES(ctx, 0); |
| _mesa_set_viewport(ctx, x, y, width, height); |
| } |
| |
| |
| /** |
| * Set new viewport parameters and update derived state (the _WindowMap |
| * matrix). Usually called from _mesa_Viewport(). |
| * |
| * \param ctx GL context. |
| * \param x, y coordinates of the lower left corner of the viewport rectangle. |
| * \param width width of the viewport rectangle. |
| * \param height height of the viewport rectangle. |
| */ |
| void |
| _mesa_set_viewport(struct gl_context *ctx, GLint x, GLint y, |
| GLsizei width, GLsizei height) |
| { |
| if (MESA_VERBOSE & VERBOSE_API) |
| _mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height); |
| |
| if (width < 0 || height < 0) { |
| _mesa_error(ctx, GL_INVALID_VALUE, |
| "glViewport(%d, %d, %d, %d)", x, y, width, height); |
| return; |
| } |
| |
| /* clamp width and height to the implementation dependent range */ |
| width = MIN2(width, (GLsizei) ctx->Const.MaxViewportWidth); |
| height = MIN2(height, (GLsizei) ctx->Const.MaxViewportHeight); |
| |
| ctx->Viewport.X = x; |
| ctx->Viewport.Width = width; |
| ctx->Viewport.Y = y; |
| ctx->Viewport.Height = height; |
| ctx->NewState |= _NEW_VIEWPORT; |
| |
| #if 1 |
| /* XXX remove this someday. Currently the DRI drivers rely on |
| * the WindowMap matrix being up to date in the driver's Viewport |
| * and DepthRange functions. |
| */ |
| _math_matrix_viewport(&ctx->Viewport._WindowMap, |
| ctx->Viewport.X, ctx->Viewport.Y, |
| ctx->Viewport.Width, ctx->Viewport.Height, |
| ctx->Viewport.Near, ctx->Viewport.Far, |
| ctx->DrawBuffer->_DepthMaxF); |
| #endif |
| |
| if (ctx->Driver.Viewport) { |
| /* Many drivers will use this call to check for window size changes |
| * and reallocate the z/stencil/accum/etc buffers if needed. |
| */ |
| ctx->Driver.Viewport(ctx, x, y, width, height); |
| } |
| } |
| |
| |
| /** |
| * Called by glDepthRange |
| * |
| * \param nearval specifies the Z buffer value which should correspond to |
| * the near clip plane |
| * \param farval specifies the Z buffer value which should correspond to |
| * the far clip plane |
| */ |
| void GLAPIENTRY |
| _mesa_DepthRange(GLclampd nearval, GLclampd farval) |
| { |
| GET_CURRENT_CONTEXT(ctx); |
| |
| FLUSH_VERTICES(ctx, 0); |
| |
| if (MESA_VERBOSE&VERBOSE_API) |
| _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval); |
| |
| if (ctx->Viewport.Near == nearval && |
| ctx->Viewport.Far == farval) |
| return; |
| |
| ctx->Viewport.Near = (GLfloat) CLAMP(nearval, 0.0, 1.0); |
| ctx->Viewport.Far = (GLfloat) CLAMP(farval, 0.0, 1.0); |
| ctx->NewState |= _NEW_VIEWPORT; |
| |
| #if 1 |
| /* XXX remove this someday. Currently the DRI drivers rely on |
| * the WindowMap matrix being up to date in the driver's Viewport |
| * and DepthRange functions. |
| */ |
| _math_matrix_viewport(&ctx->Viewport._WindowMap, |
| ctx->Viewport.X, ctx->Viewport.Y, |
| ctx->Viewport.Width, ctx->Viewport.Height, |
| ctx->Viewport.Near, ctx->Viewport.Far, |
| ctx->DrawBuffer->_DepthMaxF); |
| #endif |
| |
| if (ctx->Driver.DepthRange) { |
| ctx->Driver.DepthRange(ctx, nearval, farval); |
| } |
| } |
| |
| void GLAPIENTRY |
| _mesa_DepthRangef(GLclampf nearval, GLclampf farval) |
| { |
| _mesa_DepthRange(nearval, farval); |
| } |
| |
| /** |
| * Initialize the context viewport attribute group. |
| * \param ctx the GL context. |
| */ |
| void _mesa_init_viewport(struct gl_context *ctx) |
| { |
| GLfloat depthMax = 65535.0F; /* sorf of arbitrary */ |
| |
| /* Viewport group */ |
| ctx->Viewport.X = 0; |
| ctx->Viewport.Y = 0; |
| ctx->Viewport.Width = 0; |
| ctx->Viewport.Height = 0; |
| ctx->Viewport.Near = 0.0; |
| ctx->Viewport.Far = 1.0; |
| _math_matrix_ctr(&ctx->Viewport._WindowMap); |
| |
| _math_matrix_viewport(&ctx->Viewport._WindowMap, 0, 0, 0, 0, |
| 0.0F, 1.0F, depthMax); |
| } |
| |
| |
| /** |
| * Free the context viewport attribute group data. |
| * \param ctx the GL context. |
| */ |
| void _mesa_free_viewport_data(struct gl_context *ctx) |
| { |
| _math_matrix_dtr(&ctx->Viewport._WindowMap); |
| } |
| |