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-rw-r--r--src/mesa/swrast/s_fragprog.c224
1 files changed, 224 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c
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index 00000000000..7f7c0d6db52
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+++ b/src/mesa/swrast/s_fragprog.c
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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.5.2
+ *
+ * Copyright (C) 1999-2006 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 "glheader.h"
+#include "colormac.h"
+#include "context.h"
+#include "prog_execute.h"
+#include "prog_instruction.h"
+
+#include "s_fragprog.h"
+#include "s_span.h"
+
+
+/**
+ * Fetch a texel.
+ */
+static void
+fetch_texel( GLcontext *ctx, const GLfloat texcoord[4], GLfloat lambda,
+ GLuint unit, GLfloat color[4] )
+{
+ GLchan rgba[4];
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+
+ /* XXX use a float-valued TextureSample routine here!!! */
+ swrast->TextureSample[unit](ctx, ctx->Texture.Unit[unit]._Current,
+ 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.
+ */
+static void
+fetch_texel_deriv( GLcontext *ctx, const GLfloat texcoord[4],
+ const GLfloat texdx[4], const GLfloat texdy[4],
+ GLuint unit, GLfloat color[4] )
+{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+ const struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
+ const struct gl_texture_image *texImg = texObj->Image[0][texObj->BaseLevel];
+ const GLfloat texW = (GLfloat) texImg->WidthScale;
+ const GLfloat texH = (GLfloat) texImg->HeightScale;
+ GLchan rgba[4];
+
+ GLfloat 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]);
+
+ swrast->TextureSample[unit](ctx, ctx->Texture.Unit[unit]._Current,
+ 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)
+{
+ GLuint inputsRead = program->Base.InputsRead;
+
+ if (ctx->FragmentProgram.CallbackEnabled)
+ inputsRead = ~0;
+
+ 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;
+
+ /* Store front/back facing value in register FOGC.Y */
+ machine->Attribs[FRAG_ATTRIB_FOGC][col][1] = (GLfloat) ctx->_Facing;
+
+ 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;
+ 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;
+ 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 output;
+ for (output = 0; output < swrast->_NumColorOutputs; output++) {
+ if (outputsWritten & (1 << (FRAG_RESULT_DATA0 + output))) {
+ COPY_4V(span->array->attribs[FRAG_ATTRIB_COL0+output][i],
+ machine.Outputs[FRAG_RESULT_DATA0 + output]);
+ }
+ }
+ }
+
+ /* 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;
+}
+
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