/* * Mesa 3-D graphics library * Version: 6.5 * * Copyright (C) 1999-2005 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. * * Authors: * Keith Whitwell * Brian Paul */ #include "imports.h" #include "bufferobj.h" #include "context.h" #include "colormac.h" #include "mtypes.h" #include "program.h" #include "swrast.h" #include "s_blend.h" #include "s_context.h" #include "s_lines.h" #include "s_points.h" #include "s_span.h" #include "s_triangle.h" #include "s_texfilter.h" /** * Recompute the value of swrast->_RasterMask, etc. according to * the current context. The _RasterMask field can be easily tested by * drivers to determine certain basic GL state (does the primitive need * stenciling, logic-op, fog, etc?). */ static void _swrast_update_rasterflags( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); GLbitfield rasterMask = 0; if (ctx->Color.AlphaEnabled) rasterMask |= ALPHATEST_BIT; if (ctx->Color.BlendEnabled) rasterMask |= BLEND_BIT; if (ctx->Depth.Test) rasterMask |= DEPTH_BIT; if (swrast->_FogEnabled) rasterMask |= FOG_BIT; if (ctx->Scissor.Enabled) rasterMask |= CLIP_BIT; if (ctx->Stencil.Enabled) rasterMask |= STENCIL_BIT; if (ctx->Visual.rgbMode) { const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask); if (colorMask != 0xffffffff) rasterMask |= MASKING_BIT; if (ctx->Color._LogicOpEnabled) rasterMask |= LOGIC_OP_BIT; if (ctx->Texture._EnabledUnits) rasterMask |= TEXTURE_BIT; } else { if (ctx->Color.IndexMask != 0xffffffff) rasterMask |= MASKING_BIT; if (ctx->Color.IndexLogicOpEnabled) rasterMask |= LOGIC_OP_BIT; } if ( ctx->Viewport.X < 0 || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width || ctx->Viewport.Y < 0 || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) { rasterMask |= CLIP_BIT; } if (ctx->Query.CurrentOcclusionObject) rasterMask |= OCCLUSION_BIT; /* If we're not drawing to exactly one color buffer set the * MULTI_DRAW_BIT flag. Also set it if we're drawing to no * buffers or the RGBA or CI mask disables all writes. */ if (ctx->DrawBuffer->_NumColorDrawBuffers[0] != 1) { /* more than one color buffer designated for writing (or zero buffers) */ rasterMask |= MULTI_DRAW_BIT; } else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) { rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */ } else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) { rasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */ } if (ctx->FragmentProgram._Active) { rasterMask |= FRAGPROG_BIT; } if (ctx->ATIFragmentShader._Enabled) { rasterMask |= ATIFRAGSHADER_BIT; } #if CHAN_TYPE == GL_FLOAT if (ctx->Color.ClampFragmentColor == GL_TRUE) { rasterMask |= CLAMPING_BIT; } #endif SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask; } /** * Examine polycon culls tate to compute the _BackfaceSign field. * _BackfaceSign will be 0 if no culling, -1 if culling back-faces, * and 1 if culling front-faces. The Polygon FrontFace state also * factors in. */ static void _swrast_update_polygon( GLcontext *ctx ) { GLfloat backface_sign = 1; if (ctx->Polygon.CullFlag) { backface_sign = 1; switch(ctx->Polygon.CullFaceMode) { case GL_BACK: if(ctx->Polygon.FrontFace==GL_CCW) backface_sign = -1; break; case GL_FRONT: if(ctx->Polygon.FrontFace!=GL_CCW) backface_sign = -1; break; default: case GL_FRONT_AND_BACK: backface_sign = 0; break; } } else { backface_sign = 0; } SWRAST_CONTEXT(ctx)->_BackfaceSign = backface_sign; } /** * Update the _PreferPixelFog field to indicate if we need to compute * fog factors per-fragment. */ static void _swrast_update_fog_hint( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); swrast->_PreferPixelFog = (!swrast->AllowVertexFog || ctx->FragmentProgram._Enabled || /* not _Active! */ (ctx->Hint.Fog == GL_NICEST && swrast->AllowPixelFog)); } /** * Update the swrast->_AnyTextureCombine flag. */ static void _swrast_update_texture_env( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); GLuint i; swrast->_AnyTextureCombine = GL_FALSE; for (i = 0; i < ctx->Const.MaxTextureUnits; i++) { if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT || ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) { swrast->_AnyTextureCombine = GL_TRUE; return; } } } /** * Update swrast->_FogColor and swrast->_FogEnable values. */ static void _swrast_update_fog_state( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); /* convert fog color to GLchan values */ CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[RCOMP], ctx->Fog.Color[RCOMP]); CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[GCOMP], ctx->Fog.Color[GCOMP]); CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[BCOMP], ctx->Fog.Color[BCOMP]); /* determine if fog is needed, and if so, which fog mode */ swrast->_FogEnabled = GL_FALSE; if (ctx->FragmentProgram._Active) { if (ctx->FragmentProgram._Current->Base.Target==GL_FRAGMENT_PROGRAM_ARB) { const struct fragment_program *p = (struct fragment_program *) ctx->FragmentProgram._Current; if (p->FogOption != GL_NONE) { swrast->_FogEnabled = GL_TRUE; swrast->_FogMode = p->FogOption; } } } else if (ctx->Fog.Enabled) { swrast->_FogEnabled = GL_TRUE; swrast->_FogMode = ctx->Fog.Mode; } } /** * Update state for running fragment programs. Basically, load the * program parameters with current state values. */ static void _swrast_update_fragment_program( GLcontext *ctx ) { if (ctx->FragmentProgram._Active) { struct fragment_program *program = ctx->FragmentProgram._Current; _mesa_load_state_parameters(ctx, program->Base.Parameters); } } #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK | \ _NEW_TEXTURE | \ _NEW_HINT | \ _NEW_POLYGON ) /* State referenced by _swrast_choose_triangle, _swrast_choose_line. */ #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED | \ _NEW_RENDERMODE| \ _NEW_POLYGON| \ _NEW_DEPTH| \ _NEW_STENCIL| \ _NEW_COLOR| \ _NEW_TEXTURE| \ _SWRAST_NEW_RASTERMASK| \ _NEW_LIGHT| \ _NEW_FOG | \ _DD_NEW_SEPARATE_SPECULAR) #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED | \ _NEW_RENDERMODE| \ _NEW_LINE| \ _NEW_TEXTURE| \ _NEW_LIGHT| \ _NEW_FOG| \ _NEW_DEPTH | \ _DD_NEW_SEPARATE_SPECULAR) #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED | \ _NEW_RENDERMODE | \ _NEW_POINT | \ _NEW_TEXTURE | \ _NEW_LIGHT | \ _NEW_FOG | \ _DD_NEW_SEPARATE_SPECULAR) #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR /** * Stub for swrast->Triangle to select a true triangle function * after a state change. */ static void _swrast_validate_triangle( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1, const SWvertex *v2 ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); _swrast_validate_derived( ctx ); swrast->choose_triangle( ctx ); if (ctx->Texture._EnabledUnits == 0 && NEED_SECONDARY_COLOR(ctx) && !ctx->FragmentProgram._Active) { /* separate specular color, but no texture */ swrast->SpecTriangle = swrast->Triangle; swrast->Triangle = _swrast_add_spec_terms_triangle; } swrast->Triangle( ctx, v0, v1, v2 ); } /** * Called via swrast->Line. Examine current GL state and choose a software * line routine. Then call it. */ static void _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); _swrast_validate_derived( ctx ); swrast->choose_line( ctx ); if (ctx->Texture._EnabledUnits == 0 && NEED_SECONDARY_COLOR(ctx) && !ctx->FragmentProgram._Active) { swrast->SpecLine = swrast->Line; swrast->Line = _swrast_add_spec_terms_line; } swrast->Line( ctx, v0, v1 ); } /** * Called via swrast->Point. Examine current GL state and choose a software * point routine. Then call it. */ static void _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); _swrast_validate_derived( ctx ); swrast->choose_point( ctx ); if (ctx->Texture._EnabledUnits == 0 && NEED_SECONDARY_COLOR(ctx) && !ctx->FragmentProgram._Active) { swrast->SpecPoint = swrast->Point; swrast->Point = _swrast_add_spec_terms_point; } swrast->Point( ctx, v0 ); } /** * Called via swrast->BlendFunc. Examine GL state to choose a blending * function, then call it. */ static void _ASMAPI _swrast_validate_blend_func( GLcontext *ctx, GLuint n, const GLubyte mask[], GLchan src[][4], CONST GLchan dst[][4] ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); _swrast_validate_derived( ctx ); _swrast_choose_blend_func( ctx ); swrast->BlendFunc( ctx, n, mask, src, dst ); } static void _swrast_sleep( GLcontext *ctx, GLbitfield new_state ) { (void) ctx; (void) new_state; } static void _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); GLuint i; swrast->NewState |= new_state; /* After 10 statechanges without any swrast functions being called, * put the module to sleep. */ if (++swrast->StateChanges > 10) { swrast->InvalidateState = _swrast_sleep; swrast->NewState = ~0; new_state = ~0; } if (new_state & swrast->InvalidateTriangleMask) swrast->Triangle = _swrast_validate_triangle; if (new_state & swrast->InvalidateLineMask) swrast->Line = _swrast_validate_line; if (new_state & swrast->InvalidatePointMask) swrast->Point = _swrast_validate_point; if (new_state & _SWRAST_NEW_BLEND_FUNC) swrast->BlendFunc = _swrast_validate_blend_func; if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC) for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) swrast->TextureSample[i] = NULL; } static void _swrast_update_texture_samplers(GLcontext *ctx) { SWcontext *swrast = SWRAST_CONTEXT(ctx); GLuint u; for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) { const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current; if (tObj) swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj); } } void _swrast_validate_derived( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); if (swrast->NewState) { if (swrast->NewState & _SWRAST_NEW_RASTERMASK) _swrast_update_rasterflags( ctx ); if (swrast->NewState & _NEW_POLYGON) _swrast_update_polygon( ctx ); if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM)) _swrast_update_fog_hint( ctx ); if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE) _swrast_update_texture_env( ctx ); if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM)) _swrast_update_fog_state( ctx ); if (swrast->NewState & _NEW_PROGRAM) _swrast_update_fragment_program( ctx ); if (swrast->NewState & _NEW_TEXTURE) _swrast_update_texture_samplers( ctx ); swrast->NewState = 0; swrast->StateChanges = 0; swrast->InvalidateState = _swrast_invalidate_state; } } #define SWRAST_DEBUG 0 /* Public entrypoints: See also s_accum.c, s_bitmap.c, etc. */ void _swrast_Quad( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1, const SWvertex *v2, const SWvertex *v3 ) { if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_Quad\n"); _swrast_print_vertex( ctx, v0 ); _swrast_print_vertex( ctx, v1 ); _swrast_print_vertex( ctx, v2 ); _swrast_print_vertex( ctx, v3 ); } SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 ); SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 ); } void _swrast_Triangle( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1, const SWvertex *v2 ) { if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_Triangle\n"); _swrast_print_vertex( ctx, v0 ); _swrast_print_vertex( ctx, v1 ); _swrast_print_vertex( ctx, v2 ); } SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 ); } void _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 ) { if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_Line\n"); _swrast_print_vertex( ctx, v0 ); _swrast_print_vertex( ctx, v1 ); } SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 ); } void _swrast_Point( GLcontext *ctx, const SWvertex *v0 ) { if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_Point\n"); _swrast_print_vertex( ctx, v0 ); } SWRAST_CONTEXT(ctx)->Point( ctx, v0 ); } void _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state ) { if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_InvalidateState\n"); } SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state ); } void _swrast_ResetLineStipple( GLcontext *ctx ) { if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_ResetLineStipple\n"); } SWRAST_CONTEXT(ctx)->StippleCounter = 0; } void _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value ) { if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value); } SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT ); SWRAST_CONTEXT(ctx)->AllowVertexFog = value; } void _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value ) { if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value); } SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT ); SWRAST_CONTEXT(ctx)->AllowPixelFog = value; } GLboolean _swrast_CreateContext( GLcontext *ctx ) { GLuint i; SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext)); if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_CreateContext\n"); } if (!swrast) return GL_FALSE; swrast->NewState = ~0; swrast->choose_point = _swrast_choose_point; swrast->choose_line = _swrast_choose_line; swrast->choose_triangle = _swrast_choose_triangle; swrast->InvalidatePointMask = _SWRAST_NEW_POINT; swrast->InvalidateLineMask = _SWRAST_NEW_LINE; swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE; swrast->Point = _swrast_validate_point; swrast->Line = _swrast_validate_line; swrast->Triangle = _swrast_validate_triangle; swrast->InvalidateState = _swrast_sleep; swrast->BlendFunc = _swrast_validate_blend_func; swrast->AllowVertexFog = GL_TRUE; swrast->AllowPixelFog = GL_TRUE; /* Optimized Accum buffer */ swrast->_IntegerAccumMode = GL_FALSE; swrast->_IntegerAccumScaler = 0.0; for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++) swrast->TextureSample[i] = NULL; swrast->SpanArrays = MALLOC_STRUCT(span_arrays); if (!swrast->SpanArrays) { FREE(swrast); return GL_FALSE; } /* init point span buffer */ swrast->PointSpan.primitive = GL_POINT; swrast->PointSpan.start = 0; swrast->PointSpan.end = 0; swrast->PointSpan.facing = 0; swrast->PointSpan.array = swrast->SpanArrays; assert(ctx->Const.MaxTextureUnits > 0); assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_UNITS); swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureUnits * MAX_WIDTH * 4 * sizeof(GLchan)); if (!swrast->TexelBuffer) { FREE(swrast->SpanArrays); FREE(swrast); return GL_FALSE; } ctx->swrast_context = swrast; return GL_TRUE; } void _swrast_DestroyContext( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); if (SWRAST_DEBUG) { _mesa_debug(ctx, "_swrast_DestroyContext\n"); } FREE( swrast->SpanArrays ); FREE( swrast->TexelBuffer ); FREE( swrast ); ctx->swrast_context = 0; } struct swrast_device_driver * _swrast_GetDeviceDriverReference( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); return &swrast->Driver; } void _swrast_flush( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); /* flush any pending fragments from rendering points */ if (swrast->PointSpan.end > 0) { if (ctx->Visual.rgbMode) { _swrast_write_rgba_span(ctx, &(swrast->PointSpan)); } else { _swrast_write_index_span(ctx, &(swrast->PointSpan)); } swrast->PointSpan.end = 0; } } void _swrast_render_primitive( GLcontext *ctx, GLenum prim ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) { _swrast_flush(ctx); } swrast->Primitive = prim; } void _swrast_render_start( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); if (swrast->Driver.SpanRenderStart) swrast->Driver.SpanRenderStart( ctx ); swrast->PointSpan.end = 0; } void _swrast_render_finish( GLcontext *ctx ) { SWcontext *swrast = SWRAST_CONTEXT(ctx); if (swrast->Driver.SpanRenderFinish) swrast->Driver.SpanRenderFinish( ctx ); _swrast_flush(ctx); } #define SWRAST_DEBUG_VERTICES 0 void _swrast_print_vertex( GLcontext *ctx, const SWvertex *v ) { GLuint i; if (SWRAST_DEBUG_VERTICES) { _mesa_debug(ctx, "win %f %f %f %f\n", v->win[0], v->win[1], v->win[2], v->win[3]); for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++) if (ctx->Texture.Unit[i]._ReallyEnabled) _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i, v->texcoord[i][0], v->texcoord[i][1], v->texcoord[i][2], v->texcoord[i][3]); #if CHAN_TYPE == GL_FLOAT _mesa_debug(ctx, "color %f %f %f %f\n", v->color[0], v->color[1], v->color[2], v->color[3]); _mesa_debug(ctx, "spec %f %f %f %f\n", v->specular[0], v->specular[1], v->specular[2], v->specular[3]); #else _mesa_debug(ctx, "color %d %d %d %d\n", v->color[0], v->color[1], v->color[2], v->color[3]); _mesa_debug(ctx, "spec %d %d %d %d\n", v->specular[0], v->specular[1], v->specular[2], v->specular[3]); #endif _mesa_debug(ctx, "fog %f\n", v->fog); _mesa_debug(ctx, "index %d\n", v->index); _mesa_debug(ctx, "pointsize %f\n", v->pointSize); _mesa_debug(ctx, "\n"); } }