/* * Mesa 3-D graphics library * * Copyright (C) 1999-2007 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 * 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. * * Authors: * Keith Whitwell <keithw@vmware.com> */ #include "main/glheader.h" #include "main/context.h" #include "main/mtypes.h" #include "t_context.h" #include "t_pipeline.h" #include "t_vp_build.h" #include "t_vertex.h" void _tnl_install_pipeline( struct gl_context *ctx, const struct tnl_pipeline_stage **stages ) { TNLcontext *tnl = TNL_CONTEXT(ctx); GLuint i; tnl->pipeline.new_state = ~0; /* Create a writeable copy of each stage. */ for (i = 0 ; i < MAX_PIPELINE_STAGES && stages[i] ; i++) { struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i]; memcpy(s, stages[i], sizeof(*s)); if (s->create) s->create(ctx, s); } tnl->pipeline.nr_stages = i; } void _tnl_destroy_pipeline( struct gl_context *ctx ) { TNLcontext *tnl = TNL_CONTEXT(ctx); GLuint i; for (i = 0 ; i < tnl->pipeline.nr_stages ; i++) { struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i]; if (s->destroy) s->destroy(s); } tnl->pipeline.nr_stages = 0; } static GLuint check_input_changes( struct gl_context *ctx ) { TNLcontext *tnl = TNL_CONTEXT(ctx); GLuint i; for (i = 0; i <= _TNL_LAST_MAT; i++) { if (tnl->vb.AttribPtr[i]->size != tnl->pipeline.last_attrib_size[i] || tnl->vb.AttribPtr[i]->stride != tnl->pipeline.last_attrib_stride[i]) { tnl->pipeline.last_attrib_size[i] = tnl->vb.AttribPtr[i]->size; tnl->pipeline.last_attrib_stride[i] = tnl->vb.AttribPtr[i]->stride; tnl->pipeline.input_changes |= 1<<i; } } return tnl->pipeline.input_changes; } static GLuint check_output_changes( struct gl_context *ctx ) { #if 0 TNLcontext *tnl = TNL_CONTEXT(ctx); for (i = 0; i < VARYING_SLOT_MAX; i++) { if (tnl->vb.ResultPtr[i]->size != tnl->last_result_size[i] || tnl->vb.ResultPtr[i]->stride != tnl->last_result_stride[i]) { tnl->last_result_size[i] = tnl->vb.ResultPtr[i]->size; tnl->last_result_stride[i] = tnl->vb.ResultPtr[i]->stride; tnl->pipeline.output_changes |= 1<<i; } } if (tnl->pipeline.output_changes) tnl->Driver.NotifyOutputChanges( ctx, tnl->pipeline.output_changes ); return tnl->pipeline.output_changes; #else return ~0; #endif } /** * START/END_FAST_MATH macros: * * START_FAST_MATH: Set x86 FPU to faster, 32-bit precision mode (and save * original mode to a temporary). * END_FAST_MATH: Restore x86 FPU to original mode. */ #if defined(__GNUC__) && defined(__i386__) /* * Set the x86 FPU control word to guarentee only 32 bits of precision * are stored in registers. Allowing the FPU to store more introduces * differences between situations where numbers are pulled out of memory * vs. situations where the compiler is able to optimize register usage. * * In the worst case, we force the compiler to use a memory access to * truncate the float, by specifying the 'volatile' keyword. */ /* Hardware default: All exceptions masked, extended double precision, * round to nearest (IEEE compliant): */ #define DEFAULT_X86_FPU 0x037f /* All exceptions masked, single precision, round to nearest: */ #define FAST_X86_FPU 0x003f /* The fldcw instruction will cause any pending FP exceptions to be * raised prior to entering the block, and we clear any pending * exceptions before exiting the block. Hence, asm code has free * reign over the FPU while in the fast math block. */ #if defined(NO_FAST_MATH) #define START_FAST_MATH(x) \ do { \ static GLuint mask = DEFAULT_X86_FPU; \ __asm__ ( "fnstcw %0" : "=m" (*&(x)) ); \ __asm__ ( "fldcw %0" : : "m" (mask) ); \ } while (0) #else #define START_FAST_MATH(x) \ do { \ static GLuint mask = FAST_X86_FPU; \ __asm__ ( "fnstcw %0" : "=m" (*&(x)) ); \ __asm__ ( "fldcw %0" : : "m" (mask) ); \ } while (0) #endif /* Restore original FPU mode, and clear any exceptions that may have * occurred in the FAST_MATH block. */ #define END_FAST_MATH(x) \ do { \ __asm__ ( "fnclex ; fldcw %0" : : "m" (*&(x)) ); \ } while (0) #elif defined(_MSC_VER) && defined(_M_IX86) #define DEFAULT_X86_FPU 0x037f /* See GCC comments above */ #define FAST_X86_FPU 0x003f /* See GCC comments above */ #if defined(NO_FAST_MATH) #define START_FAST_MATH(x) do {\ static GLuint mask = DEFAULT_X86_FPU;\ __asm fnstcw word ptr [x]\ __asm fldcw word ptr [mask]\ } while(0) #else #define START_FAST_MATH(x) do {\ static GLuint mask = FAST_X86_FPU;\ __asm fnstcw word ptr [x]\ __asm fldcw word ptr [mask]\ } while(0) #endif #define END_FAST_MATH(x) do {\ __asm fnclex\ __asm fldcw word ptr [x]\ } while(0) #else #define START_FAST_MATH(x) x = 0 #define END_FAST_MATH(x) (void)(x) #endif void _tnl_run_pipeline( struct gl_context *ctx ) { TNLcontext *tnl = TNL_CONTEXT(ctx); unsigned short __tmp; GLuint i; if (!tnl->vb.Count) return; /* Check for changed input sizes or change in stride to/from zero * (ie const or non-const). */ if (check_input_changes( ctx ) || tnl->pipeline.new_state) { if (ctx->VertexProgram._MaintainTnlProgram) _tnl_UpdateFixedFunctionProgram( ctx ); for (i = 0; i < tnl->pipeline.nr_stages ; i++) { struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i]; if (s->validate) s->validate( ctx, s ); } tnl->pipeline.new_state = 0; tnl->pipeline.input_changes = 0; /* Pipeline can only change its output in response to either a * statechange or an input size/stride change. No other changes * are allowed. */ if (check_output_changes( ctx )) _tnl_notify_pipeline_output_change( ctx ); } #ifndef _OPENMP /* Don't adjust FPU precision mode in case multiple threads are to be used. * This would require that the additional threads also changed the FPU mode * which is quite a mess as this had to be done in all parallelized sections; * otherwise the master thread and all other threads are running in different * modes, producing inconsistent results. * Note that all x64 implementations don't define/use START_FAST_MATH, so * this is "hack" is only used in i386 mode */ START_FAST_MATH(__tmp); #endif for (i = 0; i < tnl->pipeline.nr_stages ; i++) { struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i]; if (!s->run( ctx, s )) break; } #ifndef _OPENMP END_FAST_MATH(__tmp); #endif } /* The default pipeline. This is useful for software rasterizers, and * simple hardware rasterizers. For customization, I don't recommend * tampering with the internals of these stages in the way that * drivers did in Mesa 3.4. These stages are basically black boxes, * and should be left intact. * * To customize the pipeline, consider: * * - removing redundant stages (making sure that the software rasterizer * can cope with this on fallback paths). An example is fog * coordinate generation, which is not required in the FX driver. * * - replacing general-purpose machine-independent stages with * general-purpose machine-specific stages. There is no example of * this to date, though it must be borne in mind that all subsequent * stages that reference the output of the new stage must cope with * any machine-specific data introduced. This may not be easy * unless there are no such stages (ie the new stage is the last in * the pipe). * * - inserting optimized (but specialized) stages ahead of the * general-purpose fallback implementation. For example, the old * fastpath mechanism, which only works when the VB->Elts input is * available, can be duplicated by placing the fastpath stage at the * head of this pipeline. Such specialized stages are currently * constrained to have no outputs (ie. they must either finish the * * pipeline by returning GL_FALSE from run(), or do nothing). * * Some work can be done to lift some of the restrictions in the final * case, if it becomes necessary to do so. */ const struct tnl_pipeline_stage *_tnl_default_pipeline[] = { &_tnl_vertex_transform_stage, &_tnl_normal_transform_stage, &_tnl_lighting_stage, &_tnl_texgen_stage, &_tnl_texture_transform_stage, &_tnl_point_attenuation_stage, &_tnl_vertex_program_stage, &_tnl_fog_coordinate_stage, &_tnl_render_stage, NULL }; const struct tnl_pipeline_stage *_tnl_vp_pipeline[] = { &_tnl_vertex_program_stage, &_tnl_render_stage, NULL };