From f069e5e412eebabe64286d35598173caac5c132e Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Thu, 21 Apr 2005 13:13:49 +0000
Subject: Facility to construct a vertex program which executes the current
 fixed function t&l pipeline.

Currently runs most of the Mesa demos OK, but still needs debugging &
polishing.
---
 src/mesa/tnl/t_vp_build.c | 1047 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1047 insertions(+)
 create mode 100644 src/mesa/tnl/t_vp_build.c

(limited to 'src/mesa/tnl/t_vp_build.c')

diff --git a/src/mesa/tnl/t_vp_build.c b/src/mesa/tnl/t_vp_build.c
new file mode 100644
index 0000000000..7113c3393c
--- /dev/null
+++ b/src/mesa/tnl/t_vp_build.c
@@ -0,0 +1,1047 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.3
+ *
+ * Copyright (C) 2005  Tungsten Graphics   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
+ * TUNGSTEN GRAPHICS 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 t_vp_build.c
+ * Create a vertex program to execute the current fixed function T&L pipeline.
+ * \author Keith Whitwell
+ */
+
+
+#include <strings.h>
+
+#include "glheader.h"
+#include "macros.h"
+#include "enums.h"
+#include "t_context.h"
+#include "t_vp_build.h"
+
+#include "shader/program.h"
+#include "shader/nvvertprog.h"
+#include "shader/arbvertparse.h"
+
+
+/* Very useful debugging tool - produces annotated listing of
+ * generated program with line/function references for each
+ * instruction back into this file:
+ */
+#define DISASSEM 1
+
+/* Use uregs to represent registers internally, translate to Mesa's
+ * expected formats on emit.  
+ *
+ * NOTE: These are passed by value extensively in this file rather
+ * than as usual by pointer reference.  If this disturbs you, try
+ * remembering they are just 32bits in size.
+ *
+ * GCC is smart enough to deal with these dword-sized structures in
+ * much the same way as if I had defined them as dwords and was using
+ * macros to access and set the fields.  This is much nicer and easier
+ * to evolve.
+ */
+struct ureg {
+   GLuint file:4;
+   GLuint idx:8;
+   GLuint negate:1;
+   GLuint swz:12;
+   GLuint pad:7;
+};
+
+
+struct tnl_program {
+   GLcontext *ctx;
+   struct vertex_program *program;
+   
+   GLuint temp_flag;
+   GLuint temp_reserved;
+   
+   struct ureg eye_position;
+   struct ureg eye_position_normalized;
+   struct ureg eye_normal;
+   struct ureg identity;
+
+   GLuint materials;
+   GLuint color_materials;
+};
+
+
+const static struct ureg undef = { 
+   ~0,
+   ~0,
+   0,
+   0,
+   0
+};
+
+/* Local shorthand:
+ */
+#define X    SWIZZLE_X
+#define Y    SWIZZLE_Y
+#define Z    SWIZZLE_Z
+#define W    SWIZZLE_W
+
+
+/* Construct a ureg:
+ */
+static struct ureg make_ureg(GLuint file, GLuint idx)
+{
+   struct ureg reg;
+   reg.file = file;
+   reg.idx = idx;
+   reg.negate = 0;
+   reg.swz = SWIZZLE_NOOP;
+   reg.pad = 0;
+   return reg;
+}
+
+
+
+static struct ureg negate( struct ureg reg )
+{
+   reg.negate ^= 1;
+   return reg;
+} 
+
+
+static struct ureg swizzle( struct ureg reg, int x, int y, int z, int w )
+{
+   reg.swz = MAKE_SWIZZLE4(GET_SWZ(reg.swz, x),
+			   GET_SWZ(reg.swz, y),
+			   GET_SWZ(reg.swz, z),
+			   GET_SWZ(reg.swz, w));
+
+   return reg;
+}
+
+static struct ureg swizzle1( struct ureg reg, int x )
+{
+   return swizzle(reg, x, x, x, x);
+}
+
+static struct ureg get_temp( struct tnl_program *p )
+{
+   int bit = ffs( ~p->temp_flag );
+   if (!bit) {
+      fprintf(stderr, "%s: out of temporaries\n", __FILE__);
+      exit(1);
+   }
+
+   p->temp_flag |= 1<<(bit-1);
+   return make_ureg(PROGRAM_TEMPORARY, bit-1);
+}
+
+static struct ureg reserve_temp( struct tnl_program *p )
+{
+   struct ureg temp = get_temp( p );
+   p->temp_reserved |= 1<<temp.idx;
+   return temp;
+}
+
+static void release_temp( struct tnl_program *p, struct ureg reg )
+{
+   if (reg.file == PROGRAM_TEMPORARY) {
+      p->temp_flag &= ~(1<<reg.idx);
+      p->temp_flag |= p->temp_reserved; /* can't release reserved temps */
+   }
+}
+
+static void release_temps( struct tnl_program *p )
+{
+   p->temp_flag = p->temp_reserved;
+}
+
+
+
+static struct ureg register_input( struct tnl_program *p, GLuint input )
+{
+   p->program->InputsRead |= (1<<input);
+   return make_ureg(PROGRAM_INPUT, input);
+}
+
+static struct ureg register_output( struct tnl_program *p, GLuint output )
+{
+   p->program->OutputsWritten |= (1<<output);
+   return make_ureg(PROGRAM_OUTPUT, output);
+}
+
+static struct ureg register_const4f( struct tnl_program *p, 
+			      GLfloat s0,
+			      GLfloat s1,
+			      GLfloat s2,
+			      GLfloat s3)
+{
+   GLfloat values[4];
+   GLuint idx;
+   values[0] = s0;
+   values[1] = s1;
+   values[2] = s2;
+   values[3] = s3;
+   idx = _mesa_add_unnamed_constant( p->program->Parameters, values );
+   return make_ureg(PROGRAM_STATE_VAR, idx);
+}
+
+#define register_const1f(p, s0)         register_const4f(p, s0, 0, 0, 1)
+#define register_const2f(p, s0, s1)     register_const4f(p, s0, s1, 0, 1)
+#define register_const3f(p, s0, s1, s2) register_const4f(p, s0, s1, s2, 1)
+
+static GLboolean is_undef( struct ureg reg )
+{
+   return reg.file == 0xf;
+}
+
+static struct ureg get_identity_param( struct tnl_program *p )
+{
+   if (is_undef(p->identity)) 
+      p->identity = register_const4f(p, 0,0,0,1);
+
+   return p->identity;
+}
+
+static struct ureg register_param6( struct tnl_program *p, 
+				   GLint s0,
+				   GLint s1,
+				   GLint s2,
+				   GLint s3,
+				   GLint s4,
+				   GLint s5)
+{
+   GLint tokens[6];
+   GLuint idx;
+   tokens[0] = s0;
+   tokens[1] = s1;
+   tokens[2] = s2;
+   tokens[3] = s3;
+   tokens[4] = s4;
+   tokens[5] = s5;
+   idx = _mesa_add_state_reference( p->program->Parameters, tokens );
+   return make_ureg(PROGRAM_STATE_VAR, idx);
+}
+
+
+#define register_param1(p,s0)          register_param6(p,s0,0,0,0,0,0)
+#define register_param2(p,s0,s1)       register_param6(p,s0,s1,0,0,0,0)
+#define register_param3(p,s0,s1,s2)    register_param6(p,s0,s1,s2,0,0,0)
+#define register_param4(p,s0,s1,s2,s3) register_param6(p,s0,s1,s2,s3,0,0)
+
+
+static void register_matrix_param6( struct tnl_program *p,
+				    GLint s0,
+				    GLint s1,
+				    GLint s2,
+				    GLint s3,
+				    GLint s4,
+				    GLint s5,
+				    struct ureg *matrix )
+{
+   GLuint i;
+
+   /* This is a bit sad as the support is there to pull the whole
+    * matrix out in one go:
+    */
+   for (i = 0; i <= s4 - s3; i++) 
+      matrix[i] = register_param6( p, s0, s1, s2, i, i, s5 );
+}
+
+
+static void emit_arg( struct vp_src_register *src,
+		      struct ureg reg )
+{
+   src->File = reg.file;
+   src->Index = reg.idx;
+   src->Swizzle = reg.swz;
+   src->Negate = reg.negate;
+   src->RelAddr = 0;
+   src->pad = 0;
+}
+
+static void emit_dst( struct vp_dst_register *dst,
+		      struct ureg reg, GLuint mask )
+{
+   dst->File = reg.file;
+   dst->Index = reg.idx;
+   dst->WriteMask = mask ? mask : WRITEMASK_XYZW; /* allow zero as a shorthand for xyzw */
+   dst->pad = 0;
+}
+
+static void debug_insn( struct vp_instruction *inst, const char *fn, GLuint line )
+{
+#if DISASSEM
+   static const char *last_fn;
+   
+   if (fn != last_fn) {
+      last_fn = fn;
+      _mesa_printf("%s:\n", fn);
+   }
+	 
+   _mesa_printf("%d:\t", line);
+   _mesa_debug_vp_inst(1, inst);
+#endif
+}
+
+
+static void emit_op3fn(struct tnl_program *p,
+		       GLuint op,
+		       struct ureg dest,
+		       GLuint mask,
+		       struct ureg src0,
+		       struct ureg src1,
+		       struct ureg src2,
+		       const char *fn,
+		       GLuint line)
+{
+   GLuint nr = p->program->Base.NumInstructions++;
+   struct vp_instruction *inst = &p->program->Instructions[nr];
+      
+   inst->Opcode = op; 
+   
+   emit_arg( &inst->SrcReg[0], src0 );
+   emit_arg( &inst->SrcReg[1], src1 );
+   emit_arg( &inst->SrcReg[2], src2 );   
+
+   emit_dst( &inst->DstReg, dest, mask );
+
+   debug_insn(inst, fn, line);
+}
+
+   
+
+#define emit_op3(p, op, dst, mask, src0, src1, src2) emit_op3fn(p, op, dst, mask, src0, src1, src2, __FUNCTION__, __LINE__)
+#define emit_op2(p, op, dst, mask, src0, src1) emit_op3fn(p, op, dst, mask, src0, src1, undef, __FUNCTION__, __LINE__)
+#define emit_op1(p, op, dst, mask, src0)       emit_op3fn(p, op, dst, mask, src0, undef,    undef, __FUNCTION__, __LINE__)
+
+
+static struct ureg make_temp( struct tnl_program *p, struct ureg reg )
+{
+   if (reg.file == PROGRAM_TEMPORARY && 
+       !(p->temp_reserved & (1<<reg.idx)))
+      return reg;
+   else {
+      struct ureg temp = get_temp(p);
+      emit_op1(p, VP_OPCODE_MOV, temp, 0, reg);
+      return temp;
+   }
+}
+
+
+/* Currently no tracking performed of input/output/register size or
+ * active elements.  Could be used to reduce these operations, as
+ * could the matrix type.
+ */
+static void emit_matrix_transform_vec4( struct tnl_program *p,
+					struct ureg dest,
+					const struct ureg *mat,
+					struct ureg src)
+{
+   emit_op2(p, VP_OPCODE_DP4, dest, WRITEMASK_X, src, mat[0]);
+   emit_op2(p, VP_OPCODE_DP4, dest, WRITEMASK_Y, src, mat[1]);
+   emit_op2(p, VP_OPCODE_DP4, dest, WRITEMASK_Z, src, mat[2]);
+   emit_op2(p, VP_OPCODE_DP4, dest, WRITEMASK_W, src, mat[3]);
+
+}
+
+static void emit_matrix_transform_vec3( struct tnl_program *p,
+					struct ureg dest,
+					const struct ureg *mat,
+					struct ureg src)
+{
+   emit_op2(p, VP_OPCODE_DP3, dest, WRITEMASK_X, src, mat[0]);
+   emit_op2(p, VP_OPCODE_DP3, dest, WRITEMASK_Y, src, mat[1]);
+   emit_op2(p, VP_OPCODE_DP3, dest, WRITEMASK_Z, src, mat[2]);
+}
+
+
+static void emit_normalize_vec3( struct tnl_program *p,
+				 struct ureg dest,
+				 struct ureg src )
+{
+   struct ureg tmp = get_temp(p);
+   emit_op2(p, VP_OPCODE_DP3, tmp, 0, src, src);
+   emit_op1(p, VP_OPCODE_RSQ, tmp, 0, tmp);
+   emit_op2(p, VP_OPCODE_MUL, dest, 0, src, tmp);
+   release_temp(p, tmp);
+}
+
+static struct ureg get_eye_position( struct tnl_program *p )
+{
+   if (is_undef(p->eye_position)) {
+      struct ureg pos = register_input( p, VERT_ATTRIB_POS ); 
+      struct ureg modelview[4];
+
+      register_matrix_param6( p, STATE_MATRIX, STATE_MODELVIEW, 0, 0, 3, 0, modelview );
+      p->eye_position = reserve_temp(p);
+
+      emit_matrix_transform_vec4( p, p->eye_position, modelview, pos );
+   }
+   
+   return p->eye_position;
+}
+
+
+static struct ureg get_eye_position_normalized( struct tnl_program *p )
+{
+   if (is_undef(p->eye_position_normalized)) {
+      struct ureg eye = get_eye_position(p);
+      p->eye_position_normalized = reserve_temp(p);
+      emit_normalize_vec3(p, p->eye_position_normalized, eye);
+   }
+   
+   return p->eye_position_normalized;
+}
+
+
+static struct ureg get_eye_normal( struct tnl_program *p )
+{
+   if (is_undef(p->eye_normal)) {
+      struct ureg normal = register_input(p, VERT_ATTRIB_NORMAL );
+      struct ureg mvinv[3];
+
+      register_matrix_param6( p, STATE_MATRIX, STATE_MODELVIEW, 0, 0, 2, STATE_MATRIX_INVTRANS, mvinv );
+
+      p->eye_normal = reserve_temp(p);
+
+      /* Transform to eye space:
+       */
+      emit_matrix_transform_vec3( p, p->eye_normal, mvinv, normal );
+
+      /* Normalize/Rescale:
+       */
+      if (p->ctx->Transform.Normalize) {
+	 emit_normalize_vec3( p, p->eye_normal, p->eye_normal );
+      }
+      else if (p->ctx->Transform.RescaleNormals) {
+	 struct ureg rescale = register_param2(p, STATE_INTERNAL, STATE_NORMAL_SCALE);
+	 emit_op2( p, VP_OPCODE_MUL, p->eye_normal, 0, normal, swizzle1(rescale, X));
+      }
+   }
+
+   return p->eye_normal;
+}
+
+
+
+static void build_hpos( struct tnl_program *p )
+{
+   struct ureg pos = register_input( p, VERT_ATTRIB_POS ); 
+   struct ureg hpos = register_output( p, VERT_RESULT_HPOS );
+   struct ureg mvp[4];
+
+   register_matrix_param6( p, STATE_MATRIX, STATE_MVP, 0, 0, 3, 0, mvp );
+   emit_matrix_transform_vec4( p, hpos, mvp, pos );
+}
+
+
+static GLuint material_attrib( GLuint side, GLuint property )
+{
+   return _TNL_ATTRIB_MAT_FRONT_AMBIENT + (property - STATE_AMBIENT) * 2 + side;
+}
+
+static void set_material_flags( struct tnl_program *p )
+{
+   GLcontext *ctx = p->ctx;
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   GLuint i;
+
+   p->color_materials = 0;
+   p->materials = 0;
+
+   if (ctx->Light.ColorMaterialEnabled) {
+      p->materials = 
+	 p->color_materials = 
+	 ctx->Light.ColorMaterialBitmask << _TNL_ATTRIB_MAT_FRONT_AMBIENT;
+   }
+
+   for (i = _TNL_ATTRIB_MAT_FRONT_AMBIENT ; i < _TNL_ATTRIB_INDEX ; i++) 
+      if (tnl->vb.AttribPtr[i]->stride) 
+	 p->materials |= 1<<i;
+}
+
+
+static struct ureg get_material( struct tnl_program *p, GLuint side, GLuint property )
+{
+   GLuint attrib = material_attrib(side, property);
+
+   if (p->color_materials & (1<<attrib))
+      return register_input(p, VERT_ATTRIB_COLOR0);
+   else if (p->materials & (1<<attrib)) 
+      return register_input( p, attrib );
+   else
+      return register_param3( p, STATE_MATERIAL, side, property );
+}
+
+#define SCENE_COLOR_BITS(side) (( _TNL_BIT_MAT_FRONT_EMISSION | \
+				   _TNL_BIT_MAT_FRONT_AMBIENT | \
+				   _TNL_BIT_MAT_FRONT_DIFFUSE) << (side))
+
+/* Either return a precalculated constant value or emit code to
+ * calculate these values dynamically in the case where material calls
+ * are present between begin/end pairs.
+ *
+ * Probably want to shift this to the program compilation phase - if
+ * we always emitted the calculation here, a smart compiler could
+ * detect that it was constant (given a certain set of inputs), and
+ * lift it out of the main loop.  That way the programs created here
+ * would be independent of the vertex_buffer details.
+ */
+static struct ureg get_scenecolor( struct tnl_program *p, GLuint side )
+{
+   if (p->materials & SCENE_COLOR_BITS(side)) {
+      struct ureg lightmodel_ambient = register_param1(p, STATE_LIGHTMODEL_AMBIENT);
+      struct ureg material_emission = get_material(p, side, STATE_EMISSION);
+      struct ureg material_ambient = get_material(p, side, STATE_AMBIENT);
+      struct ureg material_diffuse = get_material(p, side, STATE_DIFFUSE);
+      struct ureg tmp = make_temp(p, material_diffuse);
+      emit_op3(p, VP_OPCODE_MAD, tmp,  WRITEMASK_XYZ, lightmodel_ambient, material_ambient, material_emission);
+      return tmp;
+   }
+   else
+      return register_param2( p, STATE_LIGHTMODEL_SCENECOLOR, side );
+}
+
+
+static struct ureg get_lightprod( struct tnl_program *p, GLuint light, GLuint side, GLuint property )
+{
+   GLuint attrib = material_attrib(side, property);
+   if (p->materials & (1<<attrib)) {
+      struct ureg light_value = register_param3(p, STATE_LIGHT, light, property);
+      struct ureg material_value = get_material(p, side, property);
+      struct ureg tmp = get_temp(p);
+      emit_op2(p, VP_OPCODE_MUL, tmp,  0, light_value, material_value);
+      return tmp;
+   }
+   else
+      return register_param4(p, STATE_LIGHTPROD, light, side, property);
+}
+
+
+
+
+/* Need to add some addtional parameters to allow lighting in object
+ * space - STATE_SPOT_DIRECTION and STATE_HALF implicitly assume eye
+ * space lighting.
+ */
+static void build_lighting( struct tnl_program *p )
+{
+   GLcontext *ctx = p->ctx;
+   const GLboolean twoside = ctx->Light.Model.TwoSide;
+   const GLboolean separate = (ctx->Light.Model.ColorControl ==
+			       GL_SEPARATE_SPECULAR_COLOR);
+   GLuint nr_lights = 0, count = 0;
+   struct ureg normal = get_eye_normal(p);
+   struct ureg lit = get_temp(p);
+   struct ureg dots = get_temp(p);
+   struct ureg _col0 = undef, _col1 = undef;
+   struct ureg _bfc0 = undef, _bfc1 = undef;
+   GLuint i;
+
+   for (i = 0; i < MAX_LIGHTS; i++) 
+      if (ctx->Light.Light[i].Enabled)
+	 nr_lights++;
+   
+   set_material_flags(p);
+
+   {
+      struct ureg shininess = get_material(p, 0, STATE_SHININESS);
+      emit_op1(p, VP_OPCODE_MOV, dots,  WRITEMASK_W, swizzle1(shininess,X));
+      release_temp(p, shininess);
+
+      _col0 = make_temp(p, get_scenecolor(p, 0));
+      if (separate)
+	 _col1 = make_temp(p, get_identity_param(p));
+      else
+	 _col1 = _col0;
+
+   }
+
+   if (twoside) {
+      struct ureg shininess = get_material(p, 1, STATE_SHININESS);
+      emit_op1(p, VP_OPCODE_MOV, dots,  WRITEMASK_Z, negate(swizzle1(shininess,X)));
+      release_temp(p, shininess);
+
+      _bfc0 = make_temp(p, get_scenecolor(p, 1));
+      if (separate)
+	 _bfc1 = make_temp(p, get_identity_param(p));
+      else
+	 _bfc1 = _bfc0;
+   }
+
+   for (i = 0; i < MAX_LIGHTS; i++) {
+      struct gl_light *light = &ctx->Light.Light[i];
+
+      if (light->Enabled) {
+	 struct ureg half = undef;
+	 struct ureg att = undef, VPpli = undef;
+	  
+	 count++;
+
+	 if (light->EyePosition[3] == 0) {
+	    /* Can used precomputed constants in this case:
+	     */
+	    VPpli = register_param3(p, STATE_LIGHT, i, STATE_POSITION_NORMALIZED); 
+	    half = register_param3(p, STATE_LIGHT, i, STATE_HALF);
+	    
+	    /* Spot attenuation maybe applies to this case?  Could precompute if so? */
+	 } 
+	 else {
+	    struct ureg Ppli = register_param3(p, STATE_LIGHT, i, STATE_POSITION); 
+	    struct ureg V = get_eye_position(p);
+	    struct ureg dst = get_temp(p);
+
+	    VPpli = get_temp(p); 
+	    half = get_temp(p);
+ 
+	    /* Calulate VPpli vector
+	     */
+	    emit_op2(p, VP_OPCODE_SUB, VPpli, 0, Ppli, V); 
+
+	    /* Normalize VPpli.  The dst value also used in
+	     * attenuation below.
+	     */
+	    emit_op2(p, VP_OPCODE_DP3, dst, 0, VPpli, VPpli);
+	    emit_op1(p, VP_OPCODE_RSQ, dst, 0, dst);
+	    emit_op2(p, VP_OPCODE_MUL, VPpli, 0, VPpli, dst);
+
+
+	    /* Calculate  attenuation:
+	     */ 
+	    if (light->SpotCutoff != 180.0 ||
+		light->ConstantAttenuation != 1.0 ||
+		light->LinearAttenuation != 1.0 ||
+		light->QuadraticAttenuation != 1.0) {
+
+	       struct ureg attenuation = register_param3(p, STATE_LIGHT, i, STATE_ATTENUATION);
+	       att = get_temp(p);
+
+	       /* Calculate spot attenuation:
+		*/
+	       if (light->SpotCutoff != 180.0F) {
+		  struct ureg spot_dir = register_param3(p, STATE_LIGHT, i, STATE_SPOT_DIRECTION);
+		  struct ureg spot = get_temp(p);
+		  struct ureg slt = get_temp(p);
+	       
+		  emit_normalize_vec3( p, spot, spot_dir ); /* XXX: precompute! */
+		  emit_op2(p, VP_OPCODE_DP3, spot, 0, negate(VPpli), spot_dir);
+		  emit_op2(p, VP_OPCODE_SLT, slt, 0, swizzle1(spot_dir,W), spot);
+		  emit_op2(p, VP_OPCODE_POW, spot, 0, spot, swizzle1(attenuation, W));
+		  emit_op2(p, VP_OPCODE_MUL, att, 0, slt, spot);
+
+		  release_temp(p, spot);
+		  release_temp(p, slt);
+	       }
+
+	       /* Calculate distance attenuation:
+		*/
+	       if (light->ConstantAttenuation != 1.0 ||
+		   light->LinearAttenuation != 1.0 ||
+		   light->QuadraticAttenuation != 1.0) {
+
+		  emit_op1(p, VP_OPCODE_RCP, dst, WRITEMASK_YZ, dst); /* 1/d,d,d,1/d */
+		  emit_op2(p, VP_OPCODE_MUL, dst, WRITEMASK_XZ, dst, swizzle1(dst,Y)); /* 1,d,d*d,1/d */
+		  emit_op2(p, VP_OPCODE_DP3, dst, 0, attenuation, dst); /* 1/dist-atten */
+
+		  if (light->SpotCutoff != 180.0F) {
+		     emit_op1(p, VP_OPCODE_RCP, dst, 0, dst); /* dist-atten */
+		     emit_op2(p, VP_OPCODE_MUL, att, 0, dst, att);	/* spot-atten * dist-atten */
+		  } else {
+		     emit_op1(p, VP_OPCODE_RCP, att, 0, dst); /* dist-atten */
+		  }
+	       }
+	    }
+	 
+      
+	    /* Calculate viewer direction, or use infinite viewer:
+	     */
+	    if (ctx->Light.Model.LocalViewer) {
+	       struct ureg eye_hat = get_eye_position_normalized(p);
+	       emit_op2(p, VP_OPCODE_SUB, half, 0, VPpli, eye_hat);
+	    }
+	    else {
+	       struct ureg z_dir = swizzle(get_identity_param(p),X,Y,W,Z); /* 0,0,1,0 */
+	       emit_op2(p, VP_OPCODE_ADD, half, 0, VPpli, z_dir);
+	    }
+
+	    emit_normalize_vec3(p, half, half);
+
+	    release_temp(p, dst);
+	 }
+
+	 /* Calculate dot products:
+	  */
+	 emit_op2(p, VP_OPCODE_DP3, dots, WRITEMASK_X, normal, VPpli);
+	 emit_op2(p, VP_OPCODE_DP3, dots, WRITEMASK_Y, normal, half);
+
+	
+	 /* Front face lighting:
+	  */
+	 {
+	    struct ureg ambient = get_lightprod(p, i, 0, STATE_AMBIENT);
+	    struct ureg diffuse = get_lightprod(p, i, 0, STATE_DIFFUSE);
+	    struct ureg specular = get_lightprod(p, i, 0, STATE_SPECULAR);
+	    struct ureg res0, res1;
+
+	    emit_op1(p, VP_OPCODE_LIT, lit, 0, dots);
+   
+	    if (!is_undef(att)) 
+	       emit_op2(p, VP_OPCODE_MUL, lit, 0, lit, att);
+   
+   
+	    if (count == nr_lights) {
+	       if (separate) {
+		  res0 = register_output( p, VERT_RESULT_COL0 );
+		  res1 = register_output( p, VERT_RESULT_COL1 );
+	       }
+	       else {
+		  res0 = _col0;
+		  res1 = register_output( p, VERT_RESULT_COL0 );
+	       }
+	    } else {
+	       res0 = _col0;
+	       res1 = _col1;
+	    }
+
+	    emit_op3(p, VP_OPCODE_MAD, _col0, 0, swizzle1(lit,X), ambient, _col0);
+	    emit_op3(p, VP_OPCODE_MAD, res0, 0, swizzle1(lit,Y), diffuse, _col0);
+	    emit_op3(p, VP_OPCODE_MAD, res1, 0, swizzle1(lit,Z), specular, _col1);
+      
+	    release_temp(p, ambient);
+	    release_temp(p, diffuse);
+	    release_temp(p, specular);
+	 }
+
+	 /* Back face lighting:
+	  */
+	 if (twoside) {
+	    struct ureg ambient = get_lightprod(p, i, 1, STATE_AMBIENT);
+	    struct ureg diffuse = get_lightprod(p, i, 1, STATE_DIFFUSE);
+	    struct ureg specular = get_lightprod(p, i, 1, STATE_SPECULAR);
+	    struct ureg res0, res1;
+	       
+	    emit_op1(p, VP_OPCODE_LIT, lit, 0, negate(swizzle(dots,X,Y,W,Z)));
+
+	    if (!is_undef(att)) 
+	       emit_op2(p, VP_OPCODE_MUL, lit, 0, lit, att);
+
+	    if (count == nr_lights) {
+	       if (separate) {
+		  res0 = register_output( p, VERT_RESULT_BFC0 );
+		  res1 = register_output( p, VERT_RESULT_BFC1 );
+	       }
+	       else {
+		  res0 = _bfc0;
+		  res1 = register_output( p, VERT_RESULT_BFC0 );
+	       }
+	    } else {
+	       res0 = _bfc0;
+	       res1 = _bfc1;
+	    }
+
+
+	    emit_op3(p, VP_OPCODE_MAD, _bfc0, 0, swizzle1(lit,X), ambient, _bfc0);
+	    emit_op3(p, VP_OPCODE_MAD, res0, 0, swizzle1(lit,Y), diffuse, _bfc0);
+	    emit_op3(p, VP_OPCODE_MAD, res1, 0, swizzle1(lit,Z), specular, _bfc1);
+
+	    release_temp(p, ambient);
+	    release_temp(p, diffuse);
+	    release_temp(p, specular);
+	 }
+
+	 release_temp(p, half);
+	 release_temp(p, VPpli);
+	 release_temp(p, att);
+      }
+   }
+
+   release_temps( p );
+}
+
+
+static void build_fog( struct tnl_program *p )
+{
+   GLcontext *ctx = p->ctx;
+   TNLcontext *tnl = TNL_CONTEXT(ctx);
+   struct ureg fog = register_output(p, VERT_RESULT_FOGC);
+   struct ureg input;
+
+   if (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT) {
+      input = swizzle1(get_eye_position(p), Z);
+   }
+   else {
+      input = swizzle1(register_input(p, VERT_ATTRIB_FOG), X);
+   }
+
+   if (tnl->_DoVertexFog) {
+      struct ureg params = register_param1(p, STATE_FOG_PARAMS);
+      struct ureg tmp = get_temp(p);
+
+      switch (ctx->Fog.Mode) {
+      case GL_LINEAR: {
+	 struct ureg id = get_identity_param(p);
+	 emit_op2(p, VP_OPCODE_SUB, tmp, 0, swizzle1(params,Z), input); 
+	 emit_op2(p, VP_OPCODE_MUL, tmp, 0, tmp, swizzle1(params,W)); 
+	 emit_op2(p, VP_OPCODE_MAX, tmp, 0, tmp, swizzle1(id,X)); /* saturate */
+	 emit_op2(p, VP_OPCODE_MIN, fog, WRITEMASK_X, tmp, swizzle1(id,W)); /* saturate */
+	 break;
+      }
+      case GL_EXP:
+	 emit_op1(p, VP_OPCODE_ABS, tmp, 0, input); 
+	 emit_op2(p, VP_OPCODE_MUL, tmp, 0, tmp, swizzle1(params,X)); 
+	 emit_op2(p, VP_OPCODE_POW, fog, WRITEMASK_X, register_const1f(p, M_E), negate(tmp)); 
+	 break;
+      case GL_EXP2:
+	 emit_op2(p, VP_OPCODE_MUL, tmp, 0, input, swizzle1(params,X)); 
+	 emit_op2(p, VP_OPCODE_MUL, tmp, 0, tmp, tmp); 
+	 emit_op2(p, VP_OPCODE_POW, fog, WRITEMASK_X, register_const1f(p, M_E), negate(tmp)); 
+	 break;
+      }
+      
+      release_temp(p, tmp);
+   }
+   else {
+      /* results = incoming fog coords (compute fog per-fragment later) 
+       *
+       * KW:  Is it really necessary to do anything in this case?
+       */
+      emit_op1(p, VP_OPCODE_MOV, fog, WRITEMASK_X, input);
+   }
+}
+
+
+
+static void build_texture_transform( struct tnl_program *p )
+{
+   GLcontext *ctx = p->ctx;
+   GLuint i, j;
+
+   for (i = 0; i < ctx->Const.MaxTextureCoordUnits; i++) {
+      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
+      GLuint texmat_enabled = ctx->Texture._TexMatEnabled & ENABLE_TEXMAT(i);
+      struct ureg out = register_output(p, VERT_RESULT_TEX0 + i);
+
+      if (texUnit->TexGenEnabled || texmat_enabled) {
+	 struct ureg out_texgen = undef;
+
+	 if (texUnit->TexGenEnabled) {
+	    GLuint copy_mask = 0;
+	    GLuint sphere_mask = 0;
+	    GLuint reflect_mask = 0;
+	    GLuint normal_mask = 0;
+	    GLuint modes[4];
+	 
+	    if (texmat_enabled) 
+	       out_texgen = get_temp(p);
+	    else
+	       out_texgen = out;
+
+	    modes[0] = texUnit->GenModeS;
+	    modes[1] = texUnit->GenModeT;
+	    modes[2] = texUnit->GenModeR;
+	    modes[3] = texUnit->GenModeQ;
+
+	    for (j = 0; j < 4; j++) {
+	       if (texUnit->TexGenEnabled & (1<<j)) {
+		  switch (modes[j]) {
+		  case GL_OBJECT_LINEAR: {
+		     struct ureg obj = register_input(p, VERT_ATTRIB_POS);
+		     struct ureg plane = register_param3(p, STATE_TEXGEN, i, STATE_TEXGEN_OBJECT_S + j);
+		     emit_op2(p, VP_OPCODE_DP4, out_texgen, WRITEMASK_X << j, obj, plane );
+		     break;
+		  }
+		  case GL_EYE_LINEAR: {
+		     struct ureg eye = get_eye_position(p);
+		     struct ureg plane = register_param3(p, STATE_TEXGEN, i, STATE_TEXGEN_EYE_S + j);
+		     emit_op2(p, VP_OPCODE_DP4, out_texgen, WRITEMASK_X << j, eye, plane );
+		     break;
+		  }
+		  case GL_SPHERE_MAP: 
+		     sphere_mask |= WRITEMASK_X << j;
+		     break;
+		  case GL_REFLECTION_MAP_NV:
+		     reflect_mask |= WRITEMASK_X << j;
+		     break;
+		  case GL_NORMAL_MAP_NV: 
+		     normal_mask |= WRITEMASK_X << j;
+		     break;
+		  }
+	       }
+	       else 
+		  copy_mask |= WRITEMASK_X << j;
+	    }
+
+	 
+	    if (sphere_mask) {
+	       struct ureg normal = get_eye_normal(p);
+	       struct ureg eye_hat = get_eye_position_normalized(p);
+	       struct ureg tmp = get_temp(p);
+	       struct ureg half = register_const1f(p, .5);
+	       struct ureg r = get_temp(p);
+	       struct ureg inv_m = get_temp(p);
+
+	       emit_op2(p, VP_OPCODE_DP3, tmp, 0, normal, eye_hat); /* n.u */
+	       emit_op2(p, VP_OPCODE_ADD, tmp, 0, tmp, tmp); /* 2n.u */
+	       emit_op3(p, VP_OPCODE_MAD, r, 0, negate(tmp), normal, eye_hat); /* (-2n.u)n + u */
+	       emit_op2(p, VP_OPCODE_ADD, tmp, 0, r, swizzle(get_identity_param(p),X,Y,W,Z)); /* r + 0,0,1 */
+	       emit_op2(p, VP_OPCODE_DP3, tmp, 0, tmp, tmp); /* rx^2 + ry^2 + (rz+1)^2 */
+	       emit_op1(p, VP_OPCODE_RSQ, tmp, 0, tmp); /* 2/m */
+	       emit_op2(p, VP_OPCODE_MUL, inv_m, 0, tmp, swizzle1(half,X)); /* 1/m */
+	       emit_op3(p, VP_OPCODE_MAD, out_texgen, sphere_mask, r, inv_m, swizzle1(half,X));	/* r/m + 1/2 */
+	       
+	       release_temp(p, tmp);
+	       release_temp(p, r);
+	       release_temp(p, inv_m);
+	    }
+
+	    /* Could duplicate the above calculations, but it would be
+	     * a fairly odd state for someone to set (both sphere and
+	     * reflection active for different texture coordinate
+	     * components.  Of course - if two texture units enable
+	     * reflect and/or sphere, things start to tilt in favour
+	     * of seperating this out:
+	     */
+	    if (reflect_mask) {
+	       struct ureg normal = get_eye_normal(p);
+	       struct ureg eye_hat = get_eye_position_normalized(p);
+	       struct ureg tmp = get_temp(p);
+
+	       emit_op2(p, VP_OPCODE_DP3, tmp, 0, normal, eye_hat); 
+	       emit_op2(p, VP_OPCODE_ADD, tmp, 0, tmp, tmp); 
+	       emit_op3(p, VP_OPCODE_MAD, out_texgen, reflect_mask, negate(tmp), normal, eye_hat); 
+	    }
+
+	    if (normal_mask) {
+	       struct ureg normal = get_eye_normal(p);
+	       emit_op1(p, VP_OPCODE_MOV, out_texgen, normal_mask, normal );
+	    }
+
+	    if (copy_mask) {
+	       struct ureg in = register_input(p, VERT_ATTRIB_TEX0+i);
+	       emit_op1(p, VP_OPCODE_MOV, out_texgen, copy_mask, in );
+	    }
+	 }
+
+	 if (texmat_enabled) {
+	    struct ureg texmat[4];
+	    struct ureg in = !is_undef(out_texgen) ? out_texgen : register_input(p, VERT_ATTRIB_TEX0+i);
+	    register_matrix_param6( p, STATE_MATRIX, STATE_TEXTURE, i, 0, 3, 0, texmat );
+	    emit_matrix_transform_vec4( p, out, texmat, in );
+	 }
+
+	 release_temps(p);
+      }
+   }
+}
+
+
+/* Seems like it could be tighter:
+ */
+static void build_pointsize( struct tnl_program *p )
+{
+   struct ureg eye = get_eye_position(p);
+   struct ureg state_size = register_param1( p, STATE_POINT_SIZE );
+   struct ureg state_attenuation = register_param1( p, STATE_POINT_ATTENUATION );
+   struct ureg out = register_output( p, VERT_RESULT_PSIZ );
+   struct ureg ut = get_temp(p);
+
+   /* 1, -Z, Z * Z, 1 */      
+   emit_op1(p, VP_OPCODE_MOV, ut, 0, swizzle1(get_identity_param(p), W));
+   emit_op2(p, VP_OPCODE_MUL, ut, WRITEMASK_YZ, ut, negate(swizzle1(eye, Z)));
+   emit_op2(p, VP_OPCODE_MUL, ut, WRITEMASK_Z, ut, negate(swizzle1(eye, Z)));
+
+
+   /* p1 +  p2 * dst + p3 * dst * dst, 0 */
+   emit_op2(p, VP_OPCODE_DP3, ut, 0, ut, state_attenuation);
+
+   /* 1 / factor */
+   emit_op1(p, VP_OPCODE_RCP, ut, 0, ut ); 
+
+   /* out = pointSize / factor */
+   emit_op2(p, VP_OPCODE_MUL, out, WRITEMASK_X, ut, state_size); 
+
+   release_temp(p, ut);
+}
+
+
+
+void _tnl_UpdateFixedFunctionProgram( GLcontext *ctx )
+{
+   struct tnl_program p;
+
+   if (ctx->VertexProgram._Enabled)
+      return;
+
+   memset(&p, 0, sizeof(p));
+   p.ctx = ctx;
+   p.program = &ctx->_TnlProgram;
+   
+   p.eye_position = undef;
+   p.eye_position_normalized = undef;
+   p.eye_normal = undef;
+   p.identity = undef;
+
+   p.temp_flag = 0;
+   p.temp_reserved = ~((1<<MAX_NV_VERTEX_PROGRAM_TEMPS)-1);
+
+   if (p.program->Instructions == NULL) {
+      p.program->Instructions = MALLOC(sizeof(struct vp_instruction) * 100);
+   }
+
+   /* Initialize the arb_program struct */
+   p.program->Base.String = 0;
+   p.program->Base.NumInstructions =
+   p.program->Base.NumTemporaries =
+   p.program->Base.NumParameters =
+   p.program->Base.NumAttributes = p.program->Base.NumAddressRegs = 0;
+   if (p.program->Parameters)
+      _mesa_free_parameter_list(p.program->Parameters);
+   p.program->Parameters = _mesa_new_parameter_list ();
+   p.program->InputsRead = 0;
+   p.program->OutputsWritten = 0;
+
+   /* Emit the program, starting with modelviewproject:
+    */
+   build_hpos(&p);
+
+   /* Lighting calculations:
+    */
+   if (ctx->Light.Enabled)
+      build_lighting(&p);
+
+   if (ctx->Fog.Enabled)
+      build_fog(&p);
+
+   if (ctx->Texture._TexGenEnabled || ctx->Texture._TexMatEnabled)
+      build_texture_transform(&p);
+
+   if (ctx->Point._Attenuated)
+      build_pointsize(&p);
+
+
+   /* Finish up:
+    */
+   emit_op1(&p, VP_OPCODE_END, undef, 0, undef);
+
+   /* Disassemble:
+    */
+   if (DISASSEM) {
+      _mesa_printf ("\n");
+   }
+}
-- 
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