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Diffstat (limited to 'src/mesa/drivers/common/meta.c')
| -rw-r--r-- | src/mesa/drivers/common/meta.c | 814 |
1 files changed, 814 insertions, 0 deletions
diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c new file mode 100644 index 00000000000..8123a762d29 --- /dev/null +++ b/src/mesa/drivers/common/meta.c @@ -0,0 +1,814 @@ +/* + * Mesa 3-D graphics library + * Version: 7.6 + * + * 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 + * 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. + */ + +/** + * Meta operations. Some GL operations can be expressed in terms of + * other GL operations. For example, glBlitFramebuffer() can be done + * with texture mapping and glClear() can be done with polygon rendering. + * + * \author Brian Paul + */ + + +#include "main/glheader.h" +#include "main/mtypes.h" +#include "main/imports.h" +#include "main/arrayobj.h" +#include "main/blend.h" +#include "main/bufferobj.h" +#include "main/depth.h" +#include "main/enable.h" +#include "main/macros.h" +#include "main/matrix.h" +#include "main/polygon.h" +#include "main/scissor.h" +#include "main/shaders.h" +#include "main/stencil.h" +#include "main/texobj.h" +#include "main/texenv.h" +#include "main/teximage.h" +#include "main/texparam.h" +#include "main/texstate.h" +#include "main/varray.h" +#include "main/viewport.h" +#include "shader/program.h" +#include "swrast/swrast.h" +#include "drivers/common/meta.h" + + +/** + * State which we may save/restore across meta ops. + * XXX this may be incomplete... + */ +struct save_state +{ + GLbitfield SavedState; /**< bitmask of META_* flags */ + + /** META_ALPHA_TEST */ + GLboolean AlphaEnabled; + + /** META_BLEND */ + GLboolean BlendEnabled; + GLboolean ColorLogicOpEnabled; + + /** META_COLOR_MASK */ + GLubyte ColorMask[4]; + + /** META_DEPTH_TEST */ + struct gl_depthbuffer_attrib Depth; + + /** META_PIXELSTORE */ + /* XXX / TO-DO */ + + /** META_RASTERIZATION */ + GLenum FrontPolygonMode, BackPolygonMode; + GLboolean PolygonOffset; + GLboolean PolygonSmooth; + GLboolean PolygonStipple; + GLboolean PolygonCull; + + /** META_SCISSOR */ + struct gl_scissor_attrib Scissor; + + /** META_SHADER */ + GLboolean VertexProgramEnabled; + struct gl_vertex_program *VertexProgram; + GLboolean FragmentProgramEnabled; + struct gl_fragment_program *FragmentProgram; + GLuint Shader; + + /** META_STENCIL_TEST */ + struct gl_stencil_attrib Stencil; + + /** META_TRANSFORM */ + GLenum MatrixMode; + GLfloat ModelviewMatrix[16]; + GLfloat ProjectionMatrix[16]; + GLbitfield ClipPlanesEnabled; + + /** META_TEXTURE */ + GLuint ActiveUnit; + GLuint ClientActiveUnit; + /** for unit[0] only */ + struct gl_texture_object *CurrentTexture[NUM_TEXTURE_TARGETS]; + /** mask of TEXTURE_2D_BIT, etc */ + GLbitfield TexEnabled[MAX_TEXTURE_UNITS]; + GLbitfield TexGenEnabled[MAX_TEXTURE_UNITS]; + GLuint EnvMode; /* unit[0] only */ + + /** META_VERTEX */ + struct gl_array_object *ArrayObj; + struct gl_buffer_object *ArrayBufferObj; + + /** META_VIEWPORT */ + GLint ViewportX, ViewportY, ViewportW, ViewportH; + GLclampd DepthNear, DepthFar; + + /** Miscellaneous (always disabled) */ + GLboolean Lighting; + GLboolean Fog; +}; + + +/** + * State for glBlitFramebufer() + */ +struct blit_state +{ + GLuint TexObj; + GLuint ArrayObj; + GLuint VBO; + GLfloat verts[4][4]; /** four verts of X,Y,S,T */ +}; + + +/** + * State for glClear() + */ +struct clear_state +{ + GLuint ArrayObj; + GLuint VBO; + GLfloat verts[4][7]; /** four verts of X,Y,Z,R,G,B,A */ +}; + + +/** + * All per-context meta state. + */ +struct gl_meta_state +{ + struct save_state Save; /**< state saved during meta-ops */ + + struct blit_state Blit; /**< For _mesa_meta_blit_framebuffer() */ + struct clear_state Clear; /**< For _mesa_meta_clear() */ + + /* other possible meta-ops: + * glDrawPixels() + * glCopyPixels() + * glBitmap() + */ +}; + + +/** + * Initialize meta-ops for a context. + * To be called once during context creation. + */ +void +_mesa_meta_init(GLcontext *ctx) +{ + ASSERT(!ctx->Meta); + + ctx->Meta = CALLOC_STRUCT(gl_meta_state); +} + + +/** + * Free context meta-op state. + * To be called once during context destruction. + */ +void +_mesa_meta_free(GLcontext *ctx) +{ + struct gl_meta_state *meta = ctx->Meta; + + if (meta->Blit.TexObj) { + _mesa_DeleteTextures(1, &meta->Blit.TexObj); + _mesa_DeleteBuffersARB(1, & meta->Blit.VBO); + _mesa_DeleteVertexArraysAPPLE(1, &meta->Blit.ArrayObj); + } + + if (meta->Clear.VBO) { + _mesa_DeleteBuffersARB(1, & meta->Clear.VBO); + _mesa_DeleteVertexArraysAPPLE(1, &meta->Clear.ArrayObj); + } + + _mesa_free(ctx->Meta); + ctx->Meta = NULL; +} + + +/** + * Enter meta state. This is like a light-weight version of glPushAttrib + * but it also resets most GL state back to default values. + * + * \param state bitmask of META_* flags indicating which attribute groups + * to save and reset to their defaults + */ +static void +_mesa_meta_begin(GLcontext *ctx, GLbitfield state) +{ + struct save_state *save = &ctx->Meta->Save; + + save->SavedState = state; + + if (state & META_ALPHA_TEST) { + save->AlphaEnabled = ctx->Color.AlphaEnabled; + if (ctx->Color.AlphaEnabled) + _mesa_Disable(GL_ALPHA_TEST); + } + + if (state & META_BLEND) { + save->BlendEnabled = ctx->Color.BlendEnabled; + if (ctx->Color.BlendEnabled) + _mesa_Disable(GL_BLEND); + save->ColorLogicOpEnabled = ctx->Color.ColorLogicOpEnabled; + if (ctx->Color.ColorLogicOpEnabled) + _mesa_Disable(GL_COLOR_LOGIC_OP); + } + + if (state & META_COLOR_MASK) { + COPY_4V(save->ColorMask, ctx->Color.ColorMask); + if (!ctx->Color.ColorMask[0] || + !ctx->Color.ColorMask[1] || + !ctx->Color.ColorMask[2] || + !ctx->Color.ColorMask[3]) + _mesa_ColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE); + } + + if (state & META_DEPTH_TEST) { + save->Depth = ctx->Depth; /* struct copy */ + if (ctx->Depth.Test) + _mesa_Disable(GL_DEPTH_TEST); + } + + if (state & META_RASTERIZATION) { + save->FrontPolygonMode = ctx->Polygon.FrontMode; + save->BackPolygonMode = ctx->Polygon.BackMode; + save->PolygonOffset = ctx->Polygon.OffsetFill; + save->PolygonSmooth = ctx->Polygon.SmoothFlag; + save->PolygonStipple = ctx->Polygon.StippleFlag; + save->PolygonCull = ctx->Polygon.CullFlag; + _mesa_PolygonMode(GL_FRONT_AND_BACK, GL_FILL); + _mesa_set_enable(ctx, GL_POLYGON_OFFSET_FILL, GL_FALSE); + _mesa_set_enable(ctx, GL_POLYGON_SMOOTH, GL_FALSE); + _mesa_set_enable(ctx, GL_POLYGON_STIPPLE, GL_FALSE); + _mesa_set_enable(ctx, GL_CULL_FACE, GL_FALSE); + } + + if (state & META_SCISSOR) { + save->Scissor = ctx->Scissor; /* struct copy */ + } + + if (state & META_SHADER) { + if (ctx->Extensions.ARB_vertex_program) { + save->VertexProgramEnabled = ctx->VertexProgram.Enabled; + save->VertexProgram = ctx->VertexProgram.Current; + _mesa_set_enable(ctx, GL_VERTEX_PROGRAM_ARB, GL_FALSE); + } + + if (ctx->Extensions.ARB_fragment_program) { + save->FragmentProgramEnabled = ctx->FragmentProgram.Enabled; + save->FragmentProgram = ctx->FragmentProgram.Current; + _mesa_set_enable(ctx, GL_FRAGMENT_PROGRAM_ARB, GL_FALSE); + } + + if (ctx->Extensions.ARB_shader_objects) { + save->Shader = ctx->Shader.CurrentProgram ? + ctx->Shader.CurrentProgram->Name : 0; + _mesa_UseProgramObjectARB(0); + } + } + + if (state & META_STENCIL_TEST) { + save->Stencil = ctx->Stencil; /* struct copy */ + if (ctx->Stencil.Enabled) + _mesa_Disable(GL_STENCIL_TEST); + /* NOTE: other stencil state not reset */ + } + + if (state & META_TEXTURE) { + GLuint u, tgt; + + save->ActiveUnit = ctx->Texture.CurrentUnit; + save->ClientActiveUnit = ctx->Array.ActiveTexture; + save->EnvMode = ctx->Texture.Unit[0].EnvMode; + + /* Disable all texture units */ + for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { + save->TexEnabled[u] = ctx->Texture.Unit[u].Enabled; + save->TexGenEnabled[u] = ctx->Texture.Unit[u].TexGenEnabled; + _mesa_ActiveTextureARB(GL_TEXTURE0 + u); + _mesa_set_enable(ctx, GL_TEXTURE_1D, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_2D, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_3D, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_CUBE_MAP, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_RECTANGLE, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_GEN_S, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_GEN_T, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_GEN_R, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_GEN_Q, GL_FALSE); + } + + /* save current texture objects for unit[0] only */ + for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) { + _mesa_reference_texobj(&save->CurrentTexture[tgt], + ctx->Texture.Unit[0].CurrentTex[tgt]); + } + + /* set defaults for unit[0] */ + _mesa_ActiveTextureARB(GL_TEXTURE0); + _mesa_ClientActiveTextureARB(GL_TEXTURE0); + _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); + _mesa_set_enable(ctx, GL_TEXTURE_GEN_S, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_GEN_T, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_GEN_R, GL_FALSE); + _mesa_set_enable(ctx, GL_TEXTURE_GEN_Q, GL_FALSE); + } + + if (state & META_TRANSFORM) { + _mesa_memcpy(save->ModelviewMatrix, ctx->ModelviewMatrixStack.Top->m, + 16 * sizeof(GLfloat)); + _mesa_memcpy(save->ProjectionMatrix, ctx->ProjectionMatrixStack.Top->m, + 16 * sizeof(GLfloat)); + save->MatrixMode = ctx->Transform.MatrixMode; + /* set 1:1 vertex:pixel coordinate transform */ + _mesa_MatrixMode(GL_MODELVIEW); + _mesa_LoadIdentity(); + _mesa_MatrixMode(GL_PROJECTION); + _mesa_LoadIdentity(); + _mesa_Ortho(0.0F, ctx->DrawBuffer->Width, + 0.0F, ctx->DrawBuffer->Height, + -1.0F, 1.0F); + save->ClipPlanesEnabled = ctx->Transform.ClipPlanesEnabled; + if (ctx->Transform.ClipPlanesEnabled) { + GLuint i; + for (i = 0; i < ctx->Const.MaxClipPlanes; i++) { + _mesa_set_enable(ctx, GL_CLIP_PLANE0 + i, GL_FALSE); + } + } + } + + if (state & META_VERTEX) { + /* save vertex array object state */ + _mesa_reference_array_object(ctx, &save->ArrayObj, + ctx->Array.ArrayObj); + _mesa_reference_buffer_object(ctx, &save->ArrayBufferObj, + ctx->Array.ArrayBufferObj); + /* set some default state? */ + } + + if (state & META_VIEWPORT) { + save->ViewportX = ctx->Viewport.X; + save->ViewportY = ctx->Viewport.Y; + save->ViewportW = ctx->Viewport.Width; + save->ViewportH = ctx->Viewport.Height; + _mesa_Viewport(0, 0, ctx->DrawBuffer->Width, ctx->DrawBuffer->Height); + save->DepthNear = ctx->Viewport.Near; + save->DepthFar = ctx->Viewport.Far; + _mesa_DepthRange(0.0, 1.0); + } + + /* misc */ + { + save->Lighting = ctx->Light.Enabled; + if (ctx->Light.Enabled) + _mesa_set_enable(ctx, GL_LIGHTING, GL_FALSE); + + save->Fog = ctx->Fog.Enabled; + if (ctx->Fog.Enabled) + _mesa_set_enable(ctx, GL_FOG, GL_FALSE); + } +} + + +/** + * Leave meta state. This is like a light-weight version of glPopAttrib(). + */ +static void +_mesa_meta_end(GLcontext *ctx) +{ + struct save_state *save = &ctx->Meta->Save; + const GLbitfield state = save->SavedState; + + if (state & META_ALPHA_TEST) { + if (ctx->Color.AlphaEnabled != save->AlphaEnabled) + _mesa_set_enable(ctx, GL_ALPHA_TEST, save->AlphaEnabled); + } + + if (state & META_BLEND) { + if (ctx->Color.BlendEnabled != save->BlendEnabled) + _mesa_set_enable(ctx, GL_BLEND, save->BlendEnabled); + if (ctx->Color.ColorLogicOpEnabled != save->ColorLogicOpEnabled) + _mesa_set_enable(ctx, GL_COLOR_LOGIC_OP, save->ColorLogicOpEnabled); + } + + if (state & META_COLOR_MASK) { + if (!TEST_EQ_4V(ctx->Color.ColorMask, save->ColorMask)) + _mesa_ColorMask(save->ColorMask[0], save->ColorMask[1], + save->ColorMask[2], save->ColorMask[3]); + } + + if (state & META_DEPTH_TEST) { + if (ctx->Depth.Test != save->Depth.Test) + _mesa_set_enable(ctx, GL_DEPTH_TEST, save->Depth.Test); + _mesa_DepthFunc(save->Depth.Func); + _mesa_DepthMask(save->Depth.Mask); + } + + if (state & META_RASTERIZATION) { + _mesa_PolygonMode(GL_FRONT, save->FrontPolygonMode); + _mesa_PolygonMode(GL_BACK, save->BackPolygonMode); + _mesa_set_enable(ctx, GL_POLYGON_STIPPLE, save->PolygonStipple); + _mesa_set_enable(ctx, GL_POLYGON_OFFSET_FILL, save->PolygonOffset); + _mesa_set_enable(ctx, GL_POLYGON_SMOOTH, save->PolygonSmooth); + _mesa_set_enable(ctx, GL_CULL_FACE, save->PolygonCull); + } + + if (state & META_SCISSOR) { + _mesa_set_enable(ctx, GL_SCISSOR_TEST, save->Scissor.Enabled); + _mesa_Scissor(save->Scissor.X, save->Scissor.Y, + save->Scissor.Width, save->Scissor.Height); + } + + if (state & META_SHADER) { + if (ctx->Extensions.ARB_vertex_program) { + _mesa_set_enable(ctx, GL_VERTEX_PROGRAM_ARB, + save->VertexProgramEnabled); + _mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, + save->VertexProgram); + } + + if (ctx->Extensions.ARB_fragment_program) { + _mesa_set_enable(ctx, GL_FRAGMENT_PROGRAM_ARB, + save->FragmentProgramEnabled); + _mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, + save->FragmentProgram); + } + + if (ctx->Extensions.ARB_shader_objects) { + _mesa_UseProgramObjectARB(save->Shader); + } + } + + if (state & META_STENCIL_TEST) { + const struct gl_stencil_attrib *stencil = &save->Stencil; + + _mesa_set_enable(ctx, GL_STENCIL_TEST, stencil->Enabled); + _mesa_ClearStencil(stencil->Clear); + if (ctx->Extensions.EXT_stencil_two_side) { + _mesa_set_enable(ctx, GL_STENCIL_TEST_TWO_SIDE_EXT, + stencil->TestTwoSide); + _mesa_ActiveStencilFaceEXT(stencil->ActiveFace + ? GL_BACK : GL_FRONT); + } + /* front state */ + _mesa_StencilFuncSeparate(GL_FRONT, + stencil->Function[0], + stencil->Ref[0], + stencil->ValueMask[0]); + _mesa_StencilMaskSeparate(GL_FRONT, stencil->WriteMask[0]); + _mesa_StencilOpSeparate(GL_FRONT, stencil->FailFunc[0], + stencil->ZFailFunc[0], + stencil->ZPassFunc[0]); + /* back state */ + _mesa_StencilFuncSeparate(GL_BACK, + stencil->Function[1], + stencil->Ref[1], + stencil->ValueMask[1]); + _mesa_StencilMaskSeparate(GL_BACK, stencil->WriteMask[1]); + _mesa_StencilOpSeparate(GL_BACK, stencil->FailFunc[1], + stencil->ZFailFunc[1], + stencil->ZPassFunc[1]); + } + + if (state & META_TEXTURE) { + GLuint u, tgt; + + ASSERT(ctx->Texture.CurrentUnit == 0); + + /* restore texenv for unit[0] */ + _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, save->EnvMode); + + /* restore texture objects for unit[0] only */ + for (tgt = 0; tgt < NUM_TEXTURE_TARGETS; tgt++) { + _mesa_reference_texobj(&ctx->Texture.Unit[0].CurrentTex[tgt], + save->CurrentTexture[tgt]); + } + + /* Re-enable textures, texgen */ + for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { + if (save->TexEnabled[u]) { + _mesa_ActiveTextureARB(GL_TEXTURE0 + u); + + if (save->TexEnabled[u] & TEXTURE_1D_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_1D, GL_TRUE); + if (save->TexEnabled[u] & TEXTURE_2D_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_2D, GL_TRUE); + if (save->TexEnabled[u] & TEXTURE_3D_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_3D, GL_TRUE); + if (save->TexEnabled[u] & TEXTURE_CUBE_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_CUBE_MAP, GL_TRUE); + if (save->TexEnabled[u] & TEXTURE_RECT_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_RECTANGLE, GL_TRUE); + } + + if (save->TexGenEnabled[u]) { + _mesa_ActiveTextureARB(GL_TEXTURE0 + u); + + if (save->TexGenEnabled[u] & S_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_GEN_S, GL_TRUE); + if (save->TexGenEnabled[u] & T_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_GEN_T, GL_TRUE); + if (save->TexGenEnabled[u] & R_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_GEN_R, GL_TRUE); + if (save->TexGenEnabled[u] & Q_BIT) + _mesa_set_enable(ctx, GL_TEXTURE_GEN_Q, GL_TRUE); + } + } + + /* restore current unit state */ + _mesa_ActiveTextureARB(GL_TEXTURE0 + save->ActiveUnit); + _mesa_ClientActiveTextureARB(GL_TEXTURE0 + save->ClientActiveUnit); + } + + if (state & META_TRANSFORM) { + _mesa_MatrixMode(GL_MODELVIEW); + _mesa_LoadMatrixf(save->ModelviewMatrix); + _mesa_MatrixMode(GL_PROJECTION); + _mesa_LoadMatrixf(save->ProjectionMatrix); + _mesa_MatrixMode(save->MatrixMode); + save->ClipPlanesEnabled = ctx->Transform.ClipPlanesEnabled; + if (save->ClipPlanesEnabled) { + GLuint i; + for (i = 0; i < ctx->Const.MaxClipPlanes; i++) { + if (save->ClipPlanesEnabled & (1 << i)) { + _mesa_set_enable(ctx, GL_CLIP_PLANE0 + i, GL_TRUE); + } + } + } + } + + if (state & META_VERTEX) { + /* restore vertex buffer object */ + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, save->ArrayBufferObj->Name); + _mesa_reference_buffer_object(ctx, &save->ArrayBufferObj, NULL); + + /* restore vertex array object */ + _mesa_BindVertexArray(save->ArrayObj->Name); + _mesa_reference_array_object(ctx, &save->ArrayObj, NULL); + } + + if (state & META_VIEWPORT) { + _mesa_Viewport(save->ViewportX, save->ViewportY, + save->ViewportW, save->ViewportH); + _mesa_DepthRange(save->DepthNear, save->DepthFar); + } + + /* misc */ + if (save->Lighting) { + _mesa_set_enable(ctx, GL_LIGHTING, GL_TRUE); + } + if (save->Fog) { + _mesa_set_enable(ctx, GL_FOG, GL_TRUE); + } +} + + +/** + * Meta implementation of ctx->Driver.BlitFramebuffer() in terms + * of texture mapping and polygon rendering. + * Note: this function requires GL_ARB_texture_rectangle support. + */ +void +_mesa_meta_blit_framebuffer(GLcontext *ctx, + GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, + GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, + GLbitfield mask, GLenum filter) +{ + struct blit_state *blit = &ctx->Meta->Blit; + const GLint srcX = MIN2(srcX0, srcX1); + const GLint srcY = MIN2(srcY0, srcY1); + const GLint srcW = abs(srcX1 - srcX0); + const GLint srcH = abs(srcY1 - srcY0); + GLboolean srcFlipX = srcX1 < srcX0; + GLboolean srcFlipY = srcY1 < srcY0; + + ASSERT(ctx->Extensions.NV_texture_rectangle); + + if (srcFlipX) { + GLint tmp = dstX0; + dstX0 = dstX1; + dstX1 = tmp; + } + + if (srcFlipY) { + GLint tmp = dstY0; + dstY0 = dstY1; + dstY1 = tmp; + } + + /* only scissor effects blit so save/clear all other relevant state */ + _mesa_meta_begin(ctx, ~META_SCISSOR); + + if (blit->TexObj == 0) { + /* one-time setup */ + + /* create texture object */ + _mesa_GenTextures(1, &blit->TexObj); + _mesa_BindTexture(GL_TEXTURE_RECTANGLE, blit->TexObj); + _mesa_TexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); + } + else { + _mesa_BindTexture(GL_TEXTURE_RECTANGLE, blit->TexObj); + } + + _mesa_TexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MIN_FILTER, filter); + _mesa_TexParameteri(GL_TEXTURE_RECTANGLE, GL_TEXTURE_MAG_FILTER, filter); + + if (blit->ArrayObj == 0) { + /* one-time setup */ + + /* create vertex array object */ + _mesa_GenVertexArrays(1, &blit->ArrayObj); + _mesa_BindVertexArray(blit->ArrayObj); + + /* create vertex array buffer */ + _mesa_GenBuffersARB(1, &blit->VBO); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, blit->VBO); + _mesa_BufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(blit->verts), + blit->verts, GL_STREAM_DRAW_ARB); + + /* setup vertex arrays */ + _mesa_VertexPointer(2, GL_FLOAT, 4 * sizeof(GLfloat), + (void*) (0 * sizeof(GLfloat))); + _mesa_TexCoordPointer(2, GL_FLOAT, 4 * sizeof(GLfloat), + (void *) (2 * sizeof(GLfloat))); + _mesa_EnableClientState(GL_VERTEX_ARRAY); + _mesa_EnableClientState(GL_TEXTURE_COORD_ARRAY); + } + else { + _mesa_BindVertexArray(blit->ArrayObj); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, blit->VBO); + } + + /* vertex positions */ + blit->verts[0][0] = (GLfloat) dstX0; + blit->verts[0][1] = (GLfloat) dstY0; + blit->verts[1][0] = (GLfloat) dstX1; + blit->verts[1][1] = (GLfloat) dstY0; + blit->verts[2][0] = (GLfloat) dstX1; + blit->verts[2][1] = (GLfloat) dstY1; + blit->verts[3][0] = (GLfloat) dstX0; + blit->verts[3][1] = (GLfloat) dstY1; + + /* texcoords */ + blit->verts[0][2] = 0.0F; + blit->verts[0][3] = 0.0F; + blit->verts[1][2] = (GLfloat) srcW; + blit->verts[1][3] = 0.0F; + blit->verts[2][2] = (GLfloat) srcW; + blit->verts[2][3] = (GLfloat) srcH; + blit->verts[3][2] = 0.0F; + blit->verts[3][3] = (GLfloat) srcH; + + /* upload new vertex data */ + _mesa_BufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, + sizeof(blit->verts), blit->verts); + + /* copy framebuffer image to texture */ + if (mask & GL_COLOR_BUFFER_BIT) { + _mesa_CopyTexImage2D(GL_TEXTURE_RECTANGLE, 0, GL_RGBA, + srcX, srcY, srcW, srcH, 0); + mask &= ~GL_COLOR_BUFFER_BIT; + } + + _mesa_Enable(GL_TEXTURE_RECTANGLE); + + /* draw textured quad */ + _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4); + + _mesa_Disable(GL_TEXTURE_RECTANGLE); + + _mesa_meta_end(ctx); + + /* XXX, TO-DO: try to handle these cases above! */ + if (mask & (GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT)) { + _swrast_BlitFramebuffer(ctx, srcX0, srcY0, srcX1, srcY1, + dstX0, dstY0, dstX1, dstY1, mask, filter); + } + + _mesa_Finish(); +} + + +/** + * Meta implementation of ctx->Driver.Clear() in terms of polygon rendering. + */ +void +_mesa_meta_clear(GLcontext *ctx, GLbitfield buffers) +{ + struct clear_state *clear = &ctx->Meta->Clear; + GLfloat z = 1.0 - 2.0 * ctx->Depth.Clear; + GLuint i; + + /* only scissor and color mask effects clearing */ + _mesa_meta_begin(ctx, ~(META_SCISSOR | META_COLOR_MASK)); + + if (clear->ArrayObj == 0) { + /* one-time setup */ + + /* create vertex array object */ + _mesa_GenVertexArrays(1, &clear->ArrayObj); + _mesa_BindVertexArray(clear->ArrayObj); + + /* create vertex array buffer */ + _mesa_GenBuffersARB(1, &clear->VBO); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, clear->VBO); + _mesa_BufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(clear->verts), + clear->verts, GL_STREAM_DRAW_ARB); + + /* setup vertex arrays */ + _mesa_VertexPointer(3, GL_FLOAT, 7 * sizeof(GLfloat), (void *) 0); + _mesa_ColorPointer(4, GL_FLOAT, 7 * sizeof(GLfloat), + (void *) (3 * sizeof(GLfloat))); + _mesa_EnableClientState(GL_VERTEX_ARRAY); + _mesa_EnableClientState(GL_COLOR_ARRAY); + } + else { + _mesa_BindVertexArray(clear->ArrayObj); + _mesa_BindBufferARB(GL_ARRAY_BUFFER_ARB, clear->VBO); + } + + /* GL_COLOR_BUFFER_BIT */ + if (buffers & BUFFER_BITS_COLOR) { + /* leave colormask, glDrawBuffer state as-is */ + } + else { + _mesa_ColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE); + } + + /* GL_DEPTH_BUFFER_BIT */ + if (buffers & BUFFER_BIT_DEPTH) { + _mesa_set_enable(ctx, GL_DEPTH_TEST, GL_TRUE); + _mesa_DepthFunc(GL_ALWAYS); + _mesa_DepthMask(GL_TRUE); + } + else { + assert(!ctx->Depth.Test); + } + + /* GL_STENCIL_BUFFER_BIT */ + if (buffers & BUFFER_BIT_STENCIL) { + _mesa_set_enable(ctx, GL_STENCIL_TEST, GL_TRUE); + _mesa_StencilOpSeparate(GL_FRONT_AND_BACK, + GL_REPLACE, GL_REPLACE, GL_REPLACE); + _mesa_StencilFuncSeparate(GL_FRONT_AND_BACK, GL_ALWAYS, + ctx->Stencil.Clear & 0x7fffffff, + ctx->Stencil.WriteMask[0]); + } + else { + assert(!ctx->Stencil.Enabled); + } + + /* vertex positions */ + clear->verts[0][0] = (GLfloat) ctx->DrawBuffer->_Xmin; + clear->verts[0][1] = (GLfloat) ctx->DrawBuffer->_Ymin; + clear->verts[0][2] = z; + clear->verts[1][0] = (GLfloat) ctx->DrawBuffer->_Xmax; + clear->verts[1][1] = (GLfloat) ctx->DrawBuffer->_Ymin; + clear->verts[1][2] = z; + clear->verts[2][0] = (GLfloat) ctx->DrawBuffer->_Xmax; + clear->verts[2][1] = (GLfloat) ctx->DrawBuffer->_Ymax; + clear->verts[2][2] = z; + clear->verts[3][0] = (GLfloat) ctx->DrawBuffer->_Xmin; + clear->verts[3][1] = (GLfloat) ctx->DrawBuffer->_Ymax; + clear->verts[3][2] = z; + + /* vertex colors */ + for (i = 0; i < 4; i++) { + COPY_4FV(&clear->verts[i][3], ctx->Color.ClearColor); + } + + /* upload new vertex data */ + _mesa_BufferSubDataARB(GL_ARRAY_BUFFER_ARB, 0, + sizeof(clear->verts), clear->verts); + + /* draw quad */ + _mesa_DrawArrays(GL_TRIANGLE_FAN, 0, 4); + + _mesa_meta_end(ctx); +} + |