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/* |
* 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. |
*/ |
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#include "main/glheader.h" |
#include "main/colormac.h" |
#include "program/prog_instruction.h" |
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#include "s_context.h" |
#include "s_fragprog.h" |
#include "s_span.h" |
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/** |
* Apply texture object's swizzle (X/Y/Z/W/0/1) to incoming 'texel' |
* and return results in 'colorOut'. |
*/ |
static INLINE void |
swizzle_texel(const GLfloat texel[4], GLfloat colorOut[4], GLuint swizzle) |
{ |
if (swizzle == SWIZZLE_NOOP) { |
COPY_4V(colorOut, texel); |
} |
else { |
GLfloat vector[6]; |
vector[SWIZZLE_X] = texel[0]; |
vector[SWIZZLE_Y] = texel[1]; |
vector[SWIZZLE_Z] = texel[2]; |
vector[SWIZZLE_W] = texel[3]; |
vector[SWIZZLE_ZERO] = 0.0F; |
vector[SWIZZLE_ONE] = 1.0F; |
colorOut[0] = vector[GET_SWZ(swizzle, 0)]; |
colorOut[1] = vector[GET_SWZ(swizzle, 1)]; |
colorOut[2] = vector[GET_SWZ(swizzle, 2)]; |
colorOut[3] = vector[GET_SWZ(swizzle, 3)]; |
} |
} |
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/** |
* Fetch a texel with given lod. |
* Called via machine->FetchTexelLod() |
*/ |
static void |
fetch_texel_lod( struct gl_context *ctx, const GLfloat texcoord[4], GLfloat lambda, |
GLuint unit, GLfloat color[4] ) |
{ |
const struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current; |
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if (texObj) { |
SWcontext *swrast = SWRAST_CONTEXT(ctx); |
GLfloat rgba[4]; |
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lambda = CLAMP(lambda, texObj->MinLod, texObj->MaxLod); |
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swrast->TextureSample[unit](ctx, texObj, 1, |
(const GLfloat (*)[4]) texcoord, |
&lambda, &rgba); |
swizzle_texel(rgba, color, texObj->_Swizzle); |
} |
else { |
ASSIGN_4V(color, 0.0F, 0.0F, 0.0F, 1.0F); |
} |
} |
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/** |
* Fetch a texel with the given partial derivatives to compute a level |
* of detail in the mipmap. |
* Called via machine->FetchTexelDeriv() |
* \param lodBias the lod bias which may be specified by a TXB instruction, |
* otherwise zero. |
*/ |
static void |
fetch_texel_deriv( struct gl_context *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_unit *texUnit = &ctx->Texture.Unit[unit]; |
const struct gl_texture_object *texObj = texUnit->_Current; |
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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; |
GLfloat lambda; |
GLfloat rgba[4]; |
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lambda = _swrast_compute_lambda(texdx[0], texdy[0], /* ds/dx, ds/dy */ |
texdx[1], texdy[1], /* dt/dx, dt/dy */ |
texdx[3], texdy[3], /* dq/dx, dq/dy */ |
texW, texH, |
texcoord[0], texcoord[1], texcoord[3], |
1.0F / texcoord[3]); |
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lambda += lodBias + texUnit->LodBias + texObj->LodBias; |
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lambda = CLAMP(lambda, texObj->MinLod, texObj->MaxLod); |
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swrast->TextureSample[unit](ctx, texObj, 1, |
(const GLfloat (*)[4]) texcoord, |
&lambda, &rgba); |
swizzle_texel(rgba, color, texObj->_Swizzle); |
} |
else { |
ASSIGN_4V(color, 0.0F, 0.0F, 0.0F, 1.0F); |
} |
} |
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/** |
* 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(struct gl_context *ctx, struct gl_program_machine *machine, |
const struct gl_fragment_program *program, |
const SWspan *span, GLuint col) |
{ |
GLfloat *wpos = span->array->attribs[FRAG_ATTRIB_WPOS][col]; |
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if (program->Base.Target == GL_FRAGMENT_PROGRAM_NV) { |
/* Clear temporary registers (undefined for ARB_f_p) */ |
memset(machine->Temporaries, 0, MAX_PROGRAM_TEMPS * 4 * sizeof(GLfloat)); |
} |
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/* ARB_fragment_coord_conventions */ |
if (program->OriginUpperLeft) |
wpos[1] = ctx->DrawBuffer->Height - 1 - wpos[1]; |
if (!program->PixelCenterInteger) { |
wpos[0] += 0.5F; |
wpos[1] += 0.5F; |
} |
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/* Setup pointer to input attributes */ |
machine->Attribs = span->array->attribs; |
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machine->DerivX = (GLfloat (*)[4]) span->attrStepX; |
machine->DerivY = (GLfloat (*)[4]) span->attrStepY; |
machine->NumDeriv = FRAG_ATTRIB_MAX; |
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machine->Samplers = program->Base.SamplerUnits; |
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/* if running a GLSL program (not ARB_fragment_program) */ |
if (ctx->Shader.CurrentFragmentProgram) { |
/* Store front/back facing value */ |
machine->Attribs[FRAG_ATTRIB_FACE][col][0] = 1.0F - span->facing; |
} |
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machine->CurElement = col; |
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/* init condition codes */ |
machine->CondCodes[0] = COND_EQ; |
machine->CondCodes[1] = COND_EQ; |
machine->CondCodes[2] = COND_EQ; |
machine->CondCodes[3] = COND_EQ; |
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/* init call stack */ |
machine->StackDepth = 0; |
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machine->FetchTexelLod = fetch_texel_lod; |
machine->FetchTexelDeriv = fetch_texel_deriv; |
} |
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/** |
* Run fragment program on the pixels in span from 'start' to 'end' - 1. |
*/ |
static void |
run_program(struct gl_context *ctx, SWspan *span, GLuint start, GLuint end) |
{ |
SWcontext *swrast = SWRAST_CONTEXT(ctx); |
const struct gl_fragment_program *program = ctx->FragmentProgram._Current; |
const GLbitfield64 outputsWritten = program->Base.OutputsWritten; |
struct gl_program_machine *machine = &swrast->FragProgMachine; |
GLuint i; |
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for (i = start; i < end; i++) { |
if (span->array->mask[i]) { |
init_machine(ctx, machine, program, span, i); |
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if (_mesa_execute_program(ctx, &program->Base, machine)) { |
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/* Store result color */ |
if (outputsWritten & BITFIELD64_BIT(FRAG_RESULT_COLOR)) { |
COPY_4V(span->array->attribs[FRAG_ATTRIB_COL0][i], |
machine->Outputs[FRAG_RESULT_COLOR]); |
} |
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 & BITFIELD64_BIT(FRAG_RESULT_DATA0 + buf)) { |
COPY_4V(span->array->attribs[FRAG_ATTRIB_COL0 + buf][i], |
machine->Outputs[FRAG_RESULT_DATA0 + buf]); |
} |
} |
} |
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/* Store result depth/z */ |
if (outputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH)) { |
const GLfloat depth = machine->Outputs[FRAG_RESULT_DEPTH][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; |
} |
} |
} |
} |
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/** |
* Execute the current fragment program for all the fragments |
* in the given span. |
*/ |
void |
_swrast_exec_fragment_program( struct gl_context *ctx, SWspan *span ) |
{ |
const struct gl_fragment_program *program = ctx->FragmentProgram._Current; |
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/* incoming colors should be floats */ |
if (program->Base.InputsRead & FRAG_BIT_COL0) { |
ASSERT(span->array->ChanType == GL_FLOAT); |
} |
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run_program(ctx, span, 0, span->end); |
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if (program->Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_COLOR)) { |
span->interpMask &= ~SPAN_RGBA; |
span->arrayMask |= SPAN_RGBA; |
} |
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if (program->Base.OutputsWritten & BITFIELD64_BIT(FRAG_RESULT_DEPTH)) { |
span->interpMask &= ~SPAN_Z; |
span->arrayMask |= SPAN_Z; |
} |
} |
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