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-rw-r--r--src/mesa/main/nvvertexec.c699
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diff --git a/src/mesa/main/nvvertexec.c b/src/mesa/main/nvvertexec.c
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+++ b/src/mesa/main/nvvertexec.c
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+/* $Id: nvvertexec.c,v 1.1 2003/01/14 04:55:46 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 5.1
+ *
+ * Copyright (C) 1999-2003 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.
+ */
+
+/**
+ * \file nvvertexec.c
+ * \brief Code to execute vertex programs.
+ * \author Brian Paul
+ */
+
+#include "glheader.h"
+#include "context.h"
+#include "imports.h"
+#include "macros.h"
+#include "mtypes.h"
+#include "nvvertexec.h"
+#include "nvvertprog.h"
+#include "mmath.h"
+#include "math/m_matrix.h"
+
+
+/**
+ * Load/initialize the vertex program registers.
+ * This needs to be done per vertex.
+ */
+void
+_mesa_init_vp_registers(GLcontext *ctx)
+{
+ struct vp_machine *machine = &(ctx->VertexProgram.Machine);
+ GLuint i;
+
+ /* Input registers get initialized from the current vertex attribs */
+ MEMCPY(machine->Registers[VP_INPUT_REG_START],
+ ctx->Current.Attrib,
+ 16 * 4 * sizeof(GLfloat));
+
+ /* Output and temp regs are initialized to [0,0,0,1] */
+ for (i = VP_OUTPUT_REG_START; i <= VP_OUTPUT_REG_END; i++) {
+ machine->Registers[i][0] = 0.0F;
+ machine->Registers[i][1] = 0.0F;
+ machine->Registers[i][2] = 0.0F;
+ machine->Registers[i][3] = 1.0F;
+ }
+ for (i = VP_TEMP_REG_START; i <= VP_TEMP_REG_END; i++) {
+ machine->Registers[i][0] = 0.0F;
+ machine->Registers[i][1] = 0.0F;
+ machine->Registers[i][2] = 0.0F;
+ machine->Registers[i][3] = 1.0F;
+ }
+
+ /* The program regs aren't touched */
+}
+
+
+
+/**
+ * Copy the 16 elements of a matrix into four consecutive program
+ * registers starting at 'pos'.
+ */
+static void
+load_matrix(GLfloat registers[][4], GLuint pos, const GLfloat mat[16])
+{
+ GLuint i;
+ pos += VP_PROG_REG_START;
+ for (i = 0; i < 4; i++) {
+ registers[pos + i][0] = mat[0 + i];
+ registers[pos + i][1] = mat[4 + i];
+ registers[pos + i][2] = mat[8 + i];
+ registers[pos + i][3] = mat[12 + i];
+ }
+}
+
+
+/**
+ * As above, but transpose the matrix.
+ */
+static void
+load_transpose_matrix(GLfloat registers[][4], GLuint pos,
+ const GLfloat mat[16])
+{
+ pos += VP_PROG_REG_START;
+ MEMCPY(registers[pos], mat, 16 * sizeof(GLfloat));
+}
+
+
+/**
+ * Load all currently tracked matrices into the program registers.
+ * This needs to be done per glBegin/glEnd.
+ */
+void
+_mesa_init_tracked_matrices(GLcontext *ctx)
+{
+ GLuint i;
+
+ for (i = 0; i < VP_NUM_PROG_REGS / 4; i++) {
+ /* point 'mat' at source matrix */
+ GLmatrix *mat;
+ if (ctx->VertexProgram.TrackMatrix[i] == GL_MODELVIEW) {
+ mat = ctx->ModelviewMatrixStack.Top;
+ }
+ else if (ctx->VertexProgram.TrackMatrix[i] == GL_PROJECTION) {
+ mat = ctx->ProjectionMatrixStack.Top;
+ }
+ else if (ctx->VertexProgram.TrackMatrix[i] == GL_TEXTURE) {
+ mat = ctx->TextureMatrixStack[ctx->Texture.CurrentUnit].Top;
+ }
+ else if (ctx->VertexProgram.TrackMatrix[i] == GL_COLOR) {
+ mat = ctx->ColorMatrixStack.Top;
+ }
+ else if (ctx->VertexProgram.TrackMatrix[i]==GL_MODELVIEW_PROJECTION_NV) {
+ /* XXX verify the combined matrix is up to date */
+ mat = &ctx->_ModelProjectMatrix;
+ }
+ else if (ctx->VertexProgram.TrackMatrix[i] >= GL_MATRIX0_NV &&
+ ctx->VertexProgram.TrackMatrix[i] <= GL_MATRIX7_NV) {
+ GLuint n = ctx->VertexProgram.TrackMatrix[i] - GL_MATRIX0_NV;
+ ASSERT(n < MAX_PROGRAM_MATRICES);
+ mat = ctx->ProgramMatrixStack[n].Top;
+ }
+ else {
+ /* no matrix is tracked, but we leave the register values as-is */
+ assert(ctx->VertexProgram.TrackMatrix[i] == GL_NONE);
+ continue;
+ }
+
+ /* load the matrix */
+ if (ctx->VertexProgram.TrackMatrixTransform[i] == GL_IDENTITY_NV) {
+ load_matrix(ctx->VertexProgram.Machine.Registers, i*4, mat->m);
+ }
+ else if (ctx->VertexProgram.TrackMatrixTransform[i] == GL_INVERSE_NV) {
+ _math_matrix_analyse(mat); /* update the inverse */
+ assert((mat->flags & MAT_DIRTY_INVERSE) == 0);
+ load_matrix(ctx->VertexProgram.Machine.Registers, i*4, mat->inv);
+ }
+ else if (ctx->VertexProgram.TrackMatrixTransform[i] == GL_TRANSPOSE_NV) {
+ load_transpose_matrix(ctx->VertexProgram.Machine.Registers, i*4, mat->m);
+ }
+ else {
+ assert(ctx->VertexProgram.TrackMatrixTransform[i]
+ == GL_INVERSE_TRANSPOSE_NV);
+ _math_matrix_analyse(mat); /* update the inverse */
+ assert((mat->flags & MAT_DIRTY_INVERSE) == 0);
+ load_transpose_matrix(ctx->VertexProgram.Machine.Registers,
+ i*4, mat->inv);
+ }
+ }
+}
+
+
+
+/**
+ * For debugging. Dump the current vertex program machine registers.
+ */
+void
+_mesa_dump_vp_machine( const struct vp_machine *machine )
+{
+ int i;
+ _mesa_printf("VertexIn:\n");
+ for (i = 0; i < VP_NUM_INPUT_REGS; i++) {
+ _mesa_printf("%d: %f %f %f %f ", i,
+ machine->Registers[i + VP_INPUT_REG_START][0],
+ machine->Registers[i + VP_INPUT_REG_START][1],
+ machine->Registers[i + VP_INPUT_REG_START][2],
+ machine->Registers[i + VP_INPUT_REG_START][3]);
+ }
+ _mesa_printf("\n");
+
+ _mesa_printf("VertexOut:\n");
+ for (i = 0; i < VP_NUM_OUTPUT_REGS; i++) {
+ _mesa_printf("%d: %f %f %f %f ", i,
+ machine->Registers[i + VP_OUTPUT_REG_START][0],
+ machine->Registers[i + VP_OUTPUT_REG_START][1],
+ machine->Registers[i + VP_OUTPUT_REG_START][2],
+ machine->Registers[i + VP_OUTPUT_REG_START][3]);
+ }
+ _mesa_printf("\n");
+
+ _mesa_printf("Registers:\n");
+ for (i = 0; i < VP_NUM_TEMP_REGS; i++) {
+ _mesa_printf("%d: %f %f %f %f ", i,
+ machine->Registers[i + VP_TEMP_REG_START][0],
+ machine->Registers[i + VP_TEMP_REG_START][1],
+ machine->Registers[i + VP_TEMP_REG_START][2],
+ machine->Registers[i + VP_TEMP_REG_START][3]);
+ }
+ _mesa_printf("\n");
+
+ _mesa_printf("Parameters:\n");
+ for (i = 0; i < VP_NUM_PROG_REGS; i++) {
+ _mesa_printf("%d: %f %f %f %f ", i,
+ machine->Registers[i + VP_PROG_REG_START][0],
+ machine->Registers[i + VP_PROG_REG_START][1],
+ machine->Registers[i + VP_PROG_REG_START][2],
+ machine->Registers[i + VP_PROG_REG_START][3]);
+ }
+ _mesa_printf("\n");
+}
+
+
+/**
+ * Fetch a 4-element float vector from the given source register.
+ * Apply swizzling and negating as needed.
+ */
+static void
+fetch_vector4( const struct vp_src_register *source,
+ const struct vp_machine *machine,
+ GLfloat result[4] )
+{
+ static const GLfloat zero[4] = { 0, 0, 0, 0 };
+ const GLfloat *src;
+
+ if (source->RelAddr) {
+ GLint reg = source->Register + machine->AddressReg;
+ if (reg < VP_PROG_REG_START || reg > VP_PROG_REG_END)
+ src = zero;
+ else
+ src = machine->Registers[reg];
+ }
+ else {
+ src = machine->Registers[source->Register];
+ }
+
+ if (source->Negate) {
+ result[0] = -src[source->Swizzle[0]];
+ result[1] = -src[source->Swizzle[1]];
+ result[2] = -src[source->Swizzle[2]];
+ result[3] = -src[source->Swizzle[3]];
+ }
+ else {
+ result[0] = src[source->Swizzle[0]];
+ result[1] = src[source->Swizzle[1]];
+ result[2] = src[source->Swizzle[2]];
+ result[3] = src[source->Swizzle[3]];
+ }
+}
+
+
+/**
+ * As above, but only return result[0] element.
+ */
+static void
+fetch_vector1( const struct vp_src_register *source,
+ const struct vp_machine *machine,
+ GLfloat result[4] )
+{
+ static const GLfloat zero[4] = { 0, 0, 0, 0 };
+ const GLfloat *src;
+
+ if (source->RelAddr) {
+ GLint reg = source->Register + machine->AddressReg;
+ if (reg < VP_PROG_REG_START || reg > VP_PROG_REG_END)
+ src = zero;
+ else
+ src = machine->Registers[reg];
+ }
+ else {
+ src = machine->Registers[source->Register];
+ }
+
+ if (source->Negate) {
+ result[0] = -src[source->Swizzle[0]];
+ }
+ else {
+ result[0] = src[source->Swizzle[0]];
+ }
+}
+
+
+/**
+ * Store 4 floats into a register.
+ */
+static void
+store_vector4( const struct vp_dst_register *dest, struct vp_machine *machine,
+ const GLfloat value[4] )
+{
+ GLfloat *dst = machine->Registers[dest->Register];
+
+ if (dest->WriteMask[0])
+ dst[0] = value[0];
+ if (dest->WriteMask[1])
+ dst[1] = value[1];
+ if (dest->WriteMask[2])
+ dst[2] = value[2];
+ if (dest->WriteMask[3])
+ dst[3] = value[3];
+}
+
+
+/**
+ * Set x to positive or negative infinity.
+ */
+#ifdef USE_IEEE
+#define SET_POS_INFINITY(x) ( *((GLuint *) &x) = 0x7F800000 )
+#define SET_NEG_INFINITY(x) ( *((GLuint *) &x) = 0xFF800000 )
+#elif defined(VMS)
+#define SET_POS_INFINITY(x) x = __MAXFLOAT
+#define SET_NEG_INFINITY(x) x = -__MAXFLOAT
+#else
+#define SET_POS_INFINITY(x) x = (GLfloat) HUGE_VAL
+#define SET_NEG_INFINITY(x) x = (GLfloat) -HUGE_VAL
+#endif
+
+#define SET_FLOAT_BITS(x, bits) ((fi_type *) &(x))->i = bits
+
+
+/**
+ * Execute the given vertex program
+ */
+void
+_mesa_exec_vertex_program(GLcontext *ctx, const struct vertex_program *program)
+{
+ struct vp_machine *machine = &ctx->VertexProgram.Machine;
+ const struct vp_instruction *inst;
+
+ /* XXX load vertex fields into input registers */
+ /* and do other initialization */
+
+
+ for (inst = program->Instructions; inst->Opcode != VP_OPCODE_END; inst++) {
+ switch (inst->Opcode) {
+ case VP_OPCODE_MOV:
+ {
+ GLfloat t[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ store_vector4( &inst->DstReg, machine, t );
+ }
+ break;
+ case VP_OPCODE_LIT:
+ {
+ const GLfloat epsilon = 1.0e-5F; /* XXX fix? */
+ GLfloat t[4], lit[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ if (t[3] < -(128.0F - epsilon))
+ t[3] = - (128.0F - epsilon);
+ else if (t[3] > 128.0F - epsilon)
+ t[3] = 128.0F - epsilon;
+ if (t[0] < 0.0)
+ t[0] = 0.0;
+ if (t[1] < 0.0)
+ t[1] = 0.0;
+ lit[0] = 1.0;
+ lit[1] = t[0];
+ lit[2] = (t[0] > 0.0) ? (GLfloat) exp(t[3] * log(t[1])) : 0.0F;
+ lit[3] = 1.0;
+ store_vector4( &inst->DstReg, machine, lit );
+ }
+ break;
+ case VP_OPCODE_RCP:
+ {
+ GLfloat t[4];
+ fetch_vector1( &inst->SrcReg[0], machine, t );
+ if (t[0] != 1.0F)
+ t[0] = 1.0F / t[0]; /* div by zero is infinity! */
+ t[1] = t[2] = t[3] = t[0];
+ store_vector4( &inst->DstReg, machine, t );
+ }
+ break;
+ case VP_OPCODE_RSQ:
+ {
+ GLfloat t[4];
+ fetch_vector1( &inst->SrcReg[0], machine, t );
+ t[0] = (float) (1.0 / sqrt(fabs(t[0])));
+ t[1] = t[2] = t[3] = t[0];
+ store_vector4( &inst->DstReg, machine, t );
+ }
+ break;
+ case VP_OPCODE_EXP:
+ {
+ GLfloat t[4], q[4], floor_t0;
+ fetch_vector1( &inst->SrcReg[0], machine, t );
+ floor_t0 = (float) floor(t[0]);
+ if (floor_t0 > FLT_MAX_EXP) {
+ SET_POS_INFINITY(q[0]);
+ q[1] = 0.0F;
+ SET_POS_INFINITY(q[2]);
+ q[3] = 1.0F;
+ }
+ else if (floor_t0 < FLT_MIN_EXP) {
+ q[0] = 0.0F;
+ q[1] = 0.0F;
+ q[2] = 0.0F;
+ q[3] = 0.0F;
+ }
+ else {
+#ifdef USE_IEEE
+ GLint ii = (GLint) floor_t0;
+ ii = (ii < 23) + 0x3f800000;
+ SET_FLOAT_BITS(q[0], ii);
+ q[0] = *((GLfloat *) &ii);
+#else
+ q[0] = (GLfloat) pow(2.0, floor_t0);
+#endif
+ q[1] = t[0] - floor_t0;
+ q[2] = (GLfloat) (q[0] * LOG2(q[1]));
+ q[3] = 1.0F;
+ }
+ store_vector4( &inst->DstReg, machine, t );
+ }
+ break;
+ case VP_OPCODE_LOG:
+ {
+ GLfloat t[4], q[4], abs_t0;
+ fetch_vector1( &inst->SrcReg[0], machine, t );
+ abs_t0 = (GLfloat) fabs(t[0]);
+ if (abs_t0 != 0.0F) {
+ /* Since we really can't handle infinite values on VMS
+ * like other OSes we'll use __MAXFLOAT to represent
+ * infinity. This may need some tweaking.
+ */
+#ifdef VMS
+ if (abs_t0 == __MAXFLOAT) {
+#else
+ if (IS_INF_OR_NAN(abs_t0)) {
+#endif
+ SET_POS_INFINITY(q[0]);
+ q[1] = 1.0F;
+ SET_POS_INFINITY(q[2]);
+ }
+ else {
+ int exponent;
+ double mantissa = frexp(t[0], &exponent);
+ q[0] = (GLfloat) (exponent - 1);
+ q[1] = (GLfloat) (2.0 * mantissa); /* map [.5, 1) -> [1, 2) */
+ q[2] = (GLfloat) (q[0] + LOG2(q[1]));
+ }
+ }
+ else {
+ SET_NEG_INFINITY(q[0]);
+ q[1] = 1.0F;
+ SET_NEG_INFINITY(q[2]);
+ }
+ q[3] = 1.0;
+ store_vector4( &inst->DstReg, machine, q );
+ }
+ break;
+ case VP_OPCODE_MUL:
+ {
+ GLfloat t[4], u[4], prod[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ prod[0] = t[0] * u[0];
+ prod[1] = t[1] * u[1];
+ prod[2] = t[2] * u[2];
+ prod[3] = t[3] * u[3];
+ store_vector4( &inst->DstReg, machine, prod );
+ }
+ break;
+ case VP_OPCODE_ADD:
+ {
+ GLfloat t[4], u[4], sum[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ sum[0] = t[0] + u[0];
+ sum[1] = t[1] + u[1];
+ sum[2] = t[2] + u[2];
+ sum[3] = t[3] + u[3];
+ store_vector4( &inst->DstReg, machine, sum );
+ }
+ break;
+ case VP_OPCODE_DP3:
+ {
+ GLfloat t[4], u[4], dot[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ dot[0] = t[0] * u[0] + t[1] * u[1] + t[2] * u[2];
+ dot[1] = dot[2] = dot[3] = dot[0];
+ store_vector4( &inst->DstReg, machine, dot );
+ }
+ break;
+ case VP_OPCODE_DP4:
+ {
+ GLfloat t[4], u[4], dot[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ dot[0] = t[0] * u[0] + t[1] * u[1] + t[2] * u[2] + t[3] * u[3];
+ dot[1] = dot[2] = dot[3] = dot[0];
+ store_vector4( &inst->DstReg, machine, dot );
+ }
+ break;
+ case VP_OPCODE_DST:
+ {
+ GLfloat t[4], u[4], dst[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ dst[0] = 1.0F;
+ dst[1] = t[1] * u[1];
+ dst[2] = t[2];
+ dst[3] = u[3];
+ store_vector4( &inst->DstReg, machine, dst );
+ }
+ break;
+ case VP_OPCODE_MIN:
+ {
+ GLfloat t[4], u[4], min[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ min[0] = (t[0] < u[0]) ? t[0] : u[0];
+ min[1] = (t[1] < u[1]) ? t[1] : u[1];
+ min[2] = (t[2] < u[2]) ? t[2] : u[2];
+ min[3] = (t[3] < u[3]) ? t[3] : u[3];
+ store_vector4( &inst->DstReg, machine, min );
+ }
+ break;
+ case VP_OPCODE_MAX:
+ {
+ GLfloat t[4], u[4], max[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ max[0] = (t[0] > u[0]) ? t[0] : u[0];
+ max[1] = (t[1] > u[1]) ? t[1] : u[1];
+ max[2] = (t[2] > u[2]) ? t[2] : u[2];
+ max[3] = (t[3] > u[3]) ? t[3] : u[3];
+ store_vector4( &inst->DstReg, machine, max );
+ }
+ break;
+ case VP_OPCODE_SLT:
+ {
+ GLfloat t[4], u[4], slt[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ slt[0] = (t[0] < u[0]) ? 1.0F : 0.0F;
+ slt[1] = (t[1] < u[1]) ? 1.0F : 0.0F;
+ slt[2] = (t[2] < u[2]) ? 1.0F : 0.0F;
+ slt[3] = (t[3] < u[3]) ? 1.0F : 0.0F;
+ store_vector4( &inst->DstReg, machine, slt );
+ }
+ break;
+ case VP_OPCODE_SGE:
+ {
+ GLfloat t[4], u[4], sge[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ sge[0] = (t[0] >= u[0]) ? 1.0F : 0.0F;
+ sge[1] = (t[1] >= u[1]) ? 1.0F : 0.0F;
+ sge[2] = (t[2] >= u[2]) ? 1.0F : 0.0F;
+ sge[3] = (t[3] >= u[3]) ? 1.0F : 0.0F;
+ store_vector4( &inst->DstReg, machine, sge );
+ }
+ break;
+ case VP_OPCODE_MAD:
+ {
+ GLfloat t[4], u[4], v[4], sum[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ fetch_vector4( &inst->SrcReg[2], machine, v );
+ sum[0] = t[0] * u[0] + v[0];
+ sum[1] = t[1] * u[1] + v[1];
+ sum[2] = t[2] * u[2] + v[2];
+ sum[3] = t[3] * u[3] + v[3];
+ store_vector4( &inst->DstReg, machine, sum );
+ }
+ break;
+ case VP_OPCODE_ARL:
+ {
+ GLfloat t[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ machine->AddressReg = (GLint) floor(t[0]);
+ }
+ break;
+ case VP_OPCODE_DPH:
+ {
+ GLfloat t[4], u[4], dot[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ dot[0] = t[0] * u[0] + t[1] * u[1] + t[2] * u[2] + u[3];
+ dot[1] = dot[2] = dot[3] = dot[0];
+ store_vector4( &inst->DstReg, machine, dot );
+ }
+ break;
+ case VP_OPCODE_RCC:
+ {
+ GLfloat t[4], u;
+ fetch_vector1( &inst->SrcReg[0], machine, t );
+ if (t[0] == 1.0F)
+ u = 1.0F;
+ else
+ u = 1.0F / t[0];
+ if (u > 0.0F) {
+ if (u > 1.884467e+019F) {
+ u = 1.884467e+019F; /* IEEE 32-bit binary value 0x5F800000 */
+ }
+ else if (u < 5.42101e-020F) {
+ u = 5.42101e-020F; /* IEEE 32-bit binary value 0x1F800000 */
+ }
+ }
+ else {
+ if (u < -1.884467e+019F) {
+ u = -1.884467e+019F; /* IEEE 32-bit binary value 0xDF800000 */
+ }
+ else if (u > -5.42101e-020F) {
+ u = -5.42101e-020F; /* IEEE 32-bit binary value 0x9F800000 */
+ }
+ }
+ t[0] = t[1] = t[2] = t[3] = u;
+ store_vector4( &inst->DstReg, machine, t );
+ }
+ break;
+ case VP_OPCODE_SUB:
+ {
+ GLfloat t[4], u[4], sum[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ fetch_vector4( &inst->SrcReg[1], machine, u );
+ sum[0] = t[0] - u[0];
+ sum[1] = t[1] - u[1];
+ sum[2] = t[2] - u[2];
+ sum[3] = t[3] - u[3];
+ store_vector4( &inst->DstReg, machine, sum );
+ }
+ break;
+ case VP_OPCODE_ABS:
+ {
+ GLfloat t[4];
+ fetch_vector4( &inst->SrcReg[0], machine, t );
+ if (t[0] < 0.0) t[0] = -t[0];
+ if (t[1] < 0.0) t[1] = -t[1];
+ if (t[2] < 0.0) t[2] = -t[2];
+ if (t[3] < 0.0) t[3] = -t[3];
+ store_vector4( &inst->DstReg, machine, t );
+ }
+ break;
+
+ case VP_OPCODE_END:
+ return;
+ default:
+ /* bad instruction opcode */
+ _mesa_problem(ctx, "Bad VP Opcode in _mesa_exec_vertex_program");
+ return;
+ }
+ }
+}
+
+
+
+/**
+Thoughts on vertex program optimization:
+
+The obvious thing to do is to compile the vertex program into X86/SSE/3DNow!
+assembly code. That will probably be a lot of work.
+
+Another approach might be to replace the vp_instruction->Opcode field with
+a pointer to a specialized C function which executes the instruction.
+In particular we can write functions which skip swizzling, negating,
+masking, relative addressing, etc. when they're not needed.
+
+For example:
+
+void simple_add( struct vp_instruction *inst )
+{
+ GLfloat *sum = machine->Registers[inst->DstReg.Register];
+ GLfloat *a = machine->Registers[inst->SrcReg[0].Register];
+ GLfloat *b = machine->Registers[inst->SrcReg[1].Register];
+ sum[0] = a[0] + b[0];
+ sum[1] = a[1] + b[1];
+ sum[2] = a[2] + b[2];
+ sum[3] = a[3] + b[3];
+}
+
+*/
+
+/*
+
+KW:
+
+A first step would be to 'vectorize' the programs in the same way as
+the normal transformation code in the tnl module. Thus each opcode
+takes zero or more input vectors (registers) and produces one or more
+output vectors.
+
+These operations would intially be coded in C, with machine-specific
+assembly following, as is currently the case for matrix
+transformations in the math/ directory. The preprocessing scheme for
+selecting simpler operations Brian describes above would also work
+here.
+
+This should give reasonable performance without excessive effort.
+
+*/
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