| /* |
| * Mesa 3-D graphics library |
| * Version: 7.0.3 |
| * |
| * 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 |
| * 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. |
| */ |
| |
| #include "main/glheader.h" |
| #include "main/colormac.h" |
| #include "main/context.h" |
| #include "main/texstate.h" |
| #include "shader/prog_instruction.h" |
| |
| #include "s_fragprog.h" |
| #include "s_span.h" |
| |
| |
| /** |
| * Fetch a texel with given lod. |
| * Called via machine->FetchTexelLod() |
| */ |
| static void |
| fetch_texel_lod( GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda, |
| GLuint unit, GLfloat color[4] ) |
| { |
| GLchan rgba[4]; |
| SWcontext *swrast = SWRAST_CONTEXT(ctx); |
| const struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current; |
| |
| if (texObj) |
| lambda = CLAMP(lambda, texObj->MinLod, texObj->MaxLod); |
| |
| /* XXX use a float-valued TextureSample routine here!!! */ |
| swrast->TextureSample[unit](ctx, texObj, 1, (const GLfloat (*)[4]) texcoord, |
| &lambda, &rgba); |
| color[0] = CHAN_TO_FLOAT(rgba[0]); |
| color[1] = CHAN_TO_FLOAT(rgba[1]); |
| color[2] = CHAN_TO_FLOAT(rgba[2]); |
| color[3] = CHAN_TO_FLOAT(rgba[3]); |
| } |
| |
| |
| /** |
| * Fetch a texel with the given partial derivatives to compute a level |
| * of detail in the mipmap. |
| * Called via machine->FetchTexelDeriv() |
| */ |
| static void |
| fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4], |
| const GLfloat texdx[4], const GLfloat texdy[4], |
| GLfloat lodBias, GLuint unit, GLfloat color[4] ) |
| { |
| SWcontext *swrast = SWRAST_CONTEXT(ctx); |
| const struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current; |
| GLfloat lambda; |
| GLchan rgba[4]; |
| |
| if (texObj) { |
| const struct gl_texture_image *texImg = texObj->Image[0][texObj->BaseLevel]; |
| const GLfloat texW = (GLfloat) texImg->WidthScale; |
| const GLfloat texH = (GLfloat) texImg->HeightScale; |
| |
| lambda = _swrast_compute_lambda(texdx[0], texdy[0], /* ds/dx, ds/dy */ |
| texdx[1], texdy[1], /* dt/dx, dt/dy */ |
| texdx[3], texdy[2], /* dq/dx, dq/dy */ |
| texW, texH, |
| texcoord[0], texcoord[1], texcoord[3], |
| 1.0F / texcoord[3]) + lodBias; |
| |
| lambda = CLAMP(lambda, texObj->MinLod, texObj->MaxLod); |
| } |
| |
| swrast->TextureSample[unit](ctx, texObj, 1, (const GLfloat (*)[4]) texcoord, |
| &lambda, &rgba); |
| color[0] = CHAN_TO_FLOAT(rgba[0]); |
| color[1] = CHAN_TO_FLOAT(rgba[1]); |
| color[2] = CHAN_TO_FLOAT(rgba[2]); |
| color[3] = CHAN_TO_FLOAT(rgba[3]); |
| } |
| |
| |
| /** |
| * Initialize the virtual fragment program machine state prior to running |
| * fragment program on a fragment. This involves initializing the input |
| * registers, condition codes, etc. |
| * \param machine the virtual machine state to init |
| * \param program the fragment program we're about to run |
| * \param span the span of pixels we'll operate on |
| * \param col which element (column) of the span we'll operate on |
| */ |
| static void |
| init_machine(GLcontext *ctx, struct gl_program_machine *machine, |
| const struct gl_fragment_program *program, |
| const SWspan *span, GLuint col) |
| { |
| if (program->Base.Target == GL_FRAGMENT_PROGRAM_NV) { |
| /* Clear temporary registers (undefined for ARB_f_p) */ |
| _mesa_bzero(machine->Temporaries, |
| MAX_PROGRAM_TEMPS * 4 * sizeof(GLfloat)); |
| } |
| |
| /* Setup pointer to input attributes */ |
| machine->Attribs = span->array->attribs; |
| |
| machine->DerivX = (GLfloat (*)[4]) span->attrStepX; |
| machine->DerivY = (GLfloat (*)[4]) span->attrStepY; |
| machine->NumDeriv = FRAG_ATTRIB_MAX; |
| |
| machine->Samplers = program->Base.SamplerUnits; |
| |
| /* if running a GLSL program (not ARB_fragment_program) */ |
| if (ctx->Shader.CurrentProgram) { |
| /* Store front/back facing value in register FOGC.Y */ |
| machine->Attribs[FRAG_ATTRIB_FOGC][col][1] = 1.0 - span->facing; |
| /* Note FOGC.ZW is gl_PointCoord if drawing a sprite */ |
| } |
| |
| machine->CurElement = col; |
| |
| /* init condition codes */ |
| machine->CondCodes[0] = COND_EQ; |
| machine->CondCodes[1] = COND_EQ; |
| machine->CondCodes[2] = COND_EQ; |
| machine->CondCodes[3] = COND_EQ; |
| |
| /* init call stack */ |
| machine->StackDepth = 0; |
| |
| machine->FetchTexelLod = fetch_texel_lod; |
| machine->FetchTexelDeriv = fetch_texel_deriv; |
| } |
| |
| |
| /** |
| * Run fragment program on the pixels in span from 'start' to 'end' - 1. |
| */ |
| static void |
| run_program(GLcontext *ctx, SWspan *span, GLuint start, GLuint end) |
| { |
| SWcontext *swrast = SWRAST_CONTEXT(ctx); |
| const struct gl_fragment_program *program = ctx->FragmentProgram._Current; |
| const GLbitfield outputsWritten = program->Base.OutputsWritten; |
| struct gl_program_machine *machine = &swrast->FragProgMachine; |
| GLuint i; |
| |
| for (i = start; i < end; i++) { |
| if (span->array->mask[i]) { |
| init_machine(ctx, machine, program, span, i); |
| |
| if (_mesa_execute_program(ctx, &program->Base, machine)) { |
| |
| /* Store result color */ |
| if (outputsWritten & (1 << FRAG_RESULT_COLR)) { |
| COPY_4V(span->array->attribs[FRAG_ATTRIB_COL0][i], |
| machine->Outputs[FRAG_RESULT_COLR]); |
| } |
| else { |
| /* Multiple drawbuffers / render targets |
| * Note that colors beyond 0 and 1 will overwrite other |
| * attributes, such as FOGC, TEX0, TEX1, etc. That's OK. |
| */ |
| GLuint buf; |
| for (buf = 0; buf < ctx->DrawBuffer->_NumColorDrawBuffers; buf++) { |
| if (outputsWritten & (1 << (FRAG_RESULT_DATA0 + buf))) { |
| COPY_4V(span->array->attribs[FRAG_ATTRIB_COL0 + buf][i], |
| machine->Outputs[FRAG_RESULT_DATA0 + buf]); |
| } |
| } |
| } |
| |
| /* Store result depth/z */ |
| if (outputsWritten & (1 << FRAG_RESULT_DEPR)) { |
| const GLfloat depth = machine->Outputs[FRAG_RESULT_DEPR][2]; |
| if (depth <= 0.0) |
| span->array->z[i] = 0; |
| else if (depth >= 1.0) |
| span->array->z[i] = ctx->DrawBuffer->_DepthMax; |
| else |
| span->array->z[i] = IROUND(depth * ctx->DrawBuffer->_DepthMaxF); |
| } |
| } |
| else { |
| /* killed fragment */ |
| span->array->mask[i] = GL_FALSE; |
| span->writeAll = GL_FALSE; |
| } |
| } |
| } |
| } |
| |
| |
| /** |
| * Execute the current fragment program for all the fragments |
| * in the given span. |
| */ |
| void |
| _swrast_exec_fragment_program( GLcontext *ctx, SWspan *span ) |
| { |
| const struct gl_fragment_program *program = ctx->FragmentProgram._Current; |
| |
| /* incoming colors should be floats */ |
| if (program->Base.InputsRead & FRAG_BIT_COL0) { |
| ASSERT(span->array->ChanType == GL_FLOAT); |
| } |
| |
| ctx->_CurrentProgram = GL_FRAGMENT_PROGRAM_ARB; /* or NV, doesn't matter */ |
| |
| run_program(ctx, span, 0, span->end); |
| |
| if (program->Base.OutputsWritten & (1 << FRAG_RESULT_COLR)) { |
| span->interpMask &= ~SPAN_RGBA; |
| span->arrayMask |= SPAN_RGBA; |
| } |
| |
| if (program->Base.OutputsWritten & (1 << FRAG_RESULT_DEPR)) { |
| span->interpMask &= ~SPAN_Z; |
| span->arrayMask |= SPAN_Z; |
| } |
| |
| ctx->_CurrentProgram = 0; |
| } |
| |
