Imported nx-X11-3.1.0-1.tar.gznx-X11/3.1.0-1

Summary: Imported nx-X11-3.1.0-1.tar.gz
Keywords:

Imported nx-X11-3.1.0-1.tar.gz
into Git repository

1 files changed, 1165 insertions, 0 deletions

diff --git a/nx-X11/extras/Mesa/src/mesa/main/texenvprogram.c b/nx-X11/extras/Mesa/src/mesa/main/texenvprogram.c
new file mode 100644
index 000000000..4cb97469a
--- /dev/null
+++ b/nx-X11/extras/Mesa/src/mesa/main/texenvprogram.c
@@ -0,0 +1,1165 @@
+/**************************************************************************
+ * 
+ * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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, sub license, 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 (including the
+ * next paragraph) 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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 "macros.h"
+#include "enums.h"
+#include "texenvprogram.h"
+
+#include "shader/program.h"
+#include "shader/nvfragprog.h"
+#include "shader/arbfragparse.h"
+
+
+#define DISASSEM (MESA_VERBOSE & VERBOSE_DISASSEM)
+
+struct mode_opt {
+   unsigned Source:4;
+   unsigned Operand:3;
+};
+
+struct state_key {
+   GLuint enabled_units;
+   unsigned separate_specular:1;
+   unsigned fog_enabled:1;
+   unsigned fog_mode:2;
+
+   struct {
+      unsigned enabled:1;
+      unsigned source_index:3;
+      unsigned ScaleShiftRGB:2;
+      unsigned ScaleShiftA:2;
+
+      unsigned NumArgsRGB:2;
+      unsigned ModeRGB:4;
+      struct mode_opt OptRGB[3];
+
+      unsigned NumArgsA:2;
+      unsigned ModeA:4;
+      struct mode_opt OptA[3];
+   } unit[8];
+};
+
+#define FOG_LINEAR  0
+#define FOG_EXP     1
+#define FOG_EXP2    2
+#define FOG_UNKNOWN 3
+
+static GLuint translate_fog_mode( GLenum mode )
+{
+   switch (mode) {
+   case GL_LINEAR: return FOG_LINEAR;
+   case GL_EXP: return FOG_EXP;
+   case GL_EXP2: return FOG_EXP2;
+   default: return FOG_UNKNOWN;
+   }
+}
+
+#define OPR_SRC_COLOR           0
+#define OPR_ONE_MINUS_SRC_COLOR 1
+#define OPR_SRC_ALPHA           2
+#define OPR_ONE_MINUS_SRC_ALPHA	3
+#define OPR_ZERO                4
+#define OPR_ONE                 5
+#define OPR_UNKNOWN             7
+
+static GLuint translate_operand( GLenum operand )
+{
+   switch (operand) {
+   case GL_SRC_COLOR: return OPR_SRC_COLOR;
+   case GL_ONE_MINUS_SRC_COLOR: return OPR_ONE_MINUS_SRC_COLOR;
+   case GL_SRC_ALPHA: return OPR_SRC_ALPHA;
+   case GL_ONE_MINUS_SRC_ALPHA: return OPR_ONE_MINUS_SRC_ALPHA;
+   case GL_ZERO: return OPR_ZERO;
+   case GL_ONE: return OPR_ONE;
+   default:	return OPR_UNKNOWN;
+   }
+}
+
+#define SRC_TEXTURE  0
+#define SRC_TEXTURE0 1
+#define SRC_TEXTURE1 2
+#define SRC_TEXTURE2 3
+#define SRC_TEXTURE3 4
+#define SRC_TEXTURE4 5
+#define SRC_TEXTURE5 6
+#define SRC_TEXTURE6 7
+#define SRC_TEXTURE7 8
+#define SRC_CONSTANT 9
+#define SRC_PRIMARY_COLOR 10
+#define SRC_PREVIOUS 11
+#define SRC_UNKNOWN  15
+
+static GLuint translate_source( GLenum src )
+{
+   switch (src) {
+   case GL_TEXTURE: return SRC_TEXTURE;
+   case GL_TEXTURE0:
+   case GL_TEXTURE1:
+   case GL_TEXTURE2:
+   case GL_TEXTURE3:
+   case GL_TEXTURE4:
+   case GL_TEXTURE5:
+   case GL_TEXTURE6:
+   case GL_TEXTURE7: return SRC_TEXTURE0 + (src - GL_TEXTURE0);
+   case GL_CONSTANT: return SRC_CONSTANT;
+   case GL_PRIMARY_COLOR: return SRC_PRIMARY_COLOR;
+   case GL_PREVIOUS: return SRC_PREVIOUS;
+   default: return SRC_UNKNOWN;
+   }
+}
+
+#define MODE_REPLACE       0
+#define MODE_MODULATE      1
+#define MODE_ADD           2
+#define MODE_ADD_SIGNED    3
+#define MODE_INTERPOLATE   4
+#define MODE_SUBTRACT      5
+#define MODE_DOT3_RGB      6
+#define MODE_DOT3_RGB_EXT  7
+#define MODE_DOT3_RGBA     8
+#define MODE_DOT3_RGBA_EXT 9
+#define MODE_MODULATE_ADD_ATI           10
+#define MODE_MODULATE_SIGNED_ADD_ATI    11
+#define MODE_MODULATE_SUBTRACT_ATI      12
+#define MODE_UNKNOWN       15
+
+static GLuint translate_mode( GLenum mode )
+{
+   switch (mode) {
+   case GL_REPLACE: return MODE_REPLACE;
+   case GL_MODULATE: return MODE_MODULATE;
+   case GL_ADD: return MODE_ADD;
+   case GL_ADD_SIGNED: return MODE_ADD_SIGNED;
+   case GL_INTERPOLATE: return MODE_INTERPOLATE;
+   case GL_SUBTRACT: return MODE_SUBTRACT;
+   case GL_DOT3_RGB: return MODE_DOT3_RGB;
+   case GL_DOT3_RGB_EXT: return MODE_DOT3_RGB_EXT;
+   case GL_DOT3_RGBA: return MODE_DOT3_RGBA;
+   case GL_DOT3_RGBA_EXT: return MODE_DOT3_RGBA_EXT;
+   case GL_MODULATE_ADD_ATI: return MODE_MODULATE_ADD_ATI;
+   case GL_MODULATE_SIGNED_ADD_ATI: return MODE_MODULATE_SIGNED_ADD_ATI;
+   case GL_MODULATE_SUBTRACT_ATI: return MODE_MODULATE_SUBTRACT_ATI;
+   default: return MODE_UNKNOWN;
+   }
+}
+
+#define TEXTURE_UNKNOWN_INDEX 7
+static GLuint translate_tex_src_bit( GLuint bit )
+{
+   switch (bit) {
+   case TEXTURE_1D_BIT:   return TEXTURE_1D_INDEX;
+   case TEXTURE_2D_BIT:   return TEXTURE_2D_INDEX;
+   case TEXTURE_RECT_BIT: return TEXTURE_RECT_INDEX;
+   case TEXTURE_3D_BIT:   return TEXTURE_3D_INDEX;
+   case TEXTURE_CUBE_BIT: return TEXTURE_CUBE_INDEX;
+   default: return TEXTURE_UNKNOWN_INDEX;
+   }
+}
+
+static struct state_key *make_state_key( GLcontext *ctx )
+{
+   struct state_key *key = CALLOC_STRUCT(state_key);
+   GLuint i, j;
+	
+   for (i=0;i<MAX_TEXTURE_UNITS;i++) {
+      struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i];
+		
+      if (!texUnit->_ReallyEnabled)
+         continue;
+
+      key->unit[i].enabled = 1;
+      key->enabled_units |= (1<<i);
+
+      key->unit[i].source_index = 
+	 translate_tex_src_bit(texUnit->_ReallyEnabled);		
+
+      key->unit[i].NumArgsRGB = texUnit->_CurrentCombine->_NumArgsRGB;
+      key->unit[i].NumArgsA = texUnit->_CurrentCombine->_NumArgsA;
+
+      key->unit[i].ModeRGB =
+	 translate_mode(texUnit->_CurrentCombine->ModeRGB);
+      key->unit[i].ModeA =
+	 translate_mode(texUnit->_CurrentCombine->ModeA);
+		
+      key->unit[i].ScaleShiftRGB = texUnit->_CurrentCombine->ScaleShiftRGB;
+      key->unit[i].ScaleShiftA = texUnit->_CurrentCombine->ScaleShiftRGB;
+
+      for (j=0;j<3;j++) {
+         key->unit[i].OptRGB[j].Operand =
+	    translate_operand(texUnit->_CurrentCombine->OperandRGB[j]);
+         key->unit[i].OptA[j].Operand =
+	    translate_operand(texUnit->_CurrentCombine->OperandA[j]);
+         key->unit[i].OptRGB[j].Source =
+	    translate_source(texUnit->_CurrentCombine->SourceRGB[j]);
+         key->unit[i].OptA[j].Source =
+	    translate_source(texUnit->_CurrentCombine->SourceA[j]);
+      }
+   }
+	
+   if (ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
+      key->separate_specular = 1;
+
+   if (ctx->Fog.Enabled) {
+      key->fog_enabled = 1;
+      key->fog_mode = translate_fog_mode(ctx->Fog.Mode);
+   }
+	
+   return key;
+}
+
+/* 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 negatebase:1;
+   GLuint abs:1;
+   GLuint negateabs:1;
+   GLuint swz:12;
+   GLuint pad:5;
+};
+
+const static struct ureg undef = { 
+   ~0,
+   ~0,
+   0,
+   0,
+   0,
+   0,
+   0
+};
+
+#define X    0
+#define Y    1
+#define Z    2
+#define W    3
+
+/* State used to build the fragment program:
+ */
+struct texenv_fragment_program {
+   struct fragment_program *program;
+   GLcontext *ctx;
+   struct state_key *state;
+
+   GLuint alu_temps;		/* Track texture indirections, see spec. */
+   GLuint temps_output;		/* Track texture indirections, see spec. */
+
+   GLuint temp_in_use;		/* Tracks temporary regs which are in
+				 * use.
+				 */
+
+
+   GLboolean error;
+
+   struct ureg src_texture[MAX_TEXTURE_UNITS];   
+   /* Reg containing each texture unit's sampled texture color,
+    * else undef.
+    */
+
+   struct ureg src_previous;	/* Reg containing color from previous 
+				 * stage.  May need to be decl'd.
+				 */
+
+   GLuint last_tex_stage;	/* Number of last enabled texture unit */
+
+   struct ureg half;
+   struct ureg one;
+   struct ureg zero;
+};
+
+
+
+static struct ureg make_ureg(GLuint file, GLuint idx)
+{
+   struct ureg reg;
+   reg.file = file;
+   reg.idx = idx;
+   reg.negatebase = 0;
+   reg.abs = 0;
+   reg.negateabs = 0;
+   reg.swz = SWIZZLE_NOOP;
+   reg.pad = 0;
+   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 negate( struct ureg reg )
+{
+   reg.negatebase ^= 1;
+   return reg;
+}
+
+static GLboolean is_undef( struct ureg reg )
+{
+   return reg.file == 0xf;
+}
+
+
+static struct ureg get_temp( struct texenv_fragment_program *p )
+{
+   int bit;
+   
+   /* First try and reuse temps which have been used already:
+    */
+   bit = ffs( ~p->temp_in_use & p->alu_temps );
+
+   /* Then any unused temporary:
+    */
+   if (!bit)
+      bit = ffs( ~p->temp_in_use );
+
+   if (!bit) {
+      _mesa_problem(NULL, "%s: out of temporaries\n", __FILE__);
+      exit(1);
+   }
+
+   p->temp_in_use |= 1<<(bit-1);
+   return make_ureg(PROGRAM_TEMPORARY, (bit-1));
+}
+
+static struct ureg get_tex_temp( struct texenv_fragment_program *p )
+{
+   int bit;
+   
+   /* First try to find availble temp not previously used (to avoid
+    * starting a new texture indirection).  According to the spec, the
+    * ~p->temps_output isn't necessary, but will keep it there for
+    * now:
+    */
+   bit = ffs( ~p->temp_in_use & ~p->alu_temps & ~p->temps_output );
+
+   /* Then any unused temporary:
+    */
+   if (!bit) 
+      bit = ffs( ~p->temp_in_use );
+
+   if (!bit) {
+      _mesa_problem(NULL, "%s: out of temporaries\n", __FILE__);
+      exit(1);
+   }
+
+   p->temp_in_use |= 1<<(bit-1);
+   return make_ureg(PROGRAM_TEMPORARY, (bit-1));
+}
+
+
+static void release_temps( struct texenv_fragment_program *p )
+{
+   GLuint max_temp = p->ctx->Const.MaxFragmentProgramTemps;
+
+   /* KW: To support tex_env_crossbar, don't release the registers in
+    * temps_output.
+    */
+   if (max_temp >= sizeof(int) * 8)
+      p->temp_in_use = p->temps_output;
+   else
+      p->temp_in_use = ~((1<<max_temp)-1) | p->temps_output;
+}
+
+
+static struct ureg register_param6( struct texenv_fragment_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 struct ureg register_input( struct texenv_fragment_program *p, GLuint input )
+{
+   p->program->InputsRead |= (1<<input);
+   return make_ureg(PROGRAM_INPUT, input);
+}
+
+
+static void emit_arg( struct fp_src_register *reg,
+		      struct ureg ureg )
+{
+   reg->File = ureg.file;
+   reg->Index = ureg.idx;
+   reg->Swizzle = ureg.swz;
+   reg->NegateBase = ureg.negatebase;
+   reg->Abs = ureg.abs;
+   reg->NegateAbs = ureg.negateabs;
+}
+
+static void emit_dst( struct fp_dst_register *dst,
+		      struct ureg ureg, GLuint mask )
+{
+   dst->File = ureg.file;
+   dst->Index = ureg.idx;
+   dst->WriteMask = mask;
+   dst->CondMask = 0;
+   dst->CondSwizzle = 0;
+}
+
+static struct fp_instruction *
+emit_op(struct texenv_fragment_program *p,
+	GLuint op,
+	struct ureg dest,
+	GLuint mask,
+	GLuint saturate,
+	struct ureg src0,
+	struct ureg src1,
+	struct ureg src2 )
+{
+   GLuint nr = p->program->Base.NumInstructions++;
+   struct fp_instruction *inst = &p->program->Instructions[nr];
+      
+   memset(inst, 0, sizeof(*inst));
+   inst->Opcode = op;
+   
+   emit_arg( &inst->SrcReg[0], src0 );
+   emit_arg( &inst->SrcReg[1], src1 );
+   emit_arg( &inst->SrcReg[2], src2 );
+   
+   inst->Saturate = saturate;
+
+   emit_dst( &inst->DstReg, dest, mask );
+
+   /* Accounting for indirection tracking:
+    */
+   if (dest.file == PROGRAM_TEMPORARY)
+      p->temps_output |= 1 << dest.idx;
+
+   return inst;
+}
+   
+
+static struct ureg emit_arith( struct texenv_fragment_program *p,
+			       GLuint op,
+			       struct ureg dest,
+			       GLuint mask,
+			       GLuint saturate,
+			       struct ureg src0,
+			       struct ureg src1,
+			       struct ureg src2 )
+{
+   emit_op(p, op, dest, mask, saturate, src0, src1, src2);
+   
+   /* Accounting for indirection tracking:
+    */
+   if (src0.file == PROGRAM_TEMPORARY)
+      p->alu_temps |= 1 << src0.idx;
+
+   if (!is_undef(src1) && src1.file == PROGRAM_TEMPORARY)
+      p->alu_temps |= 1 << src1.idx;
+
+   if (!is_undef(src2) && src2.file == PROGRAM_TEMPORARY)
+      p->alu_temps |= 1 << src2.idx;
+
+   if (dest.file == PROGRAM_TEMPORARY)
+      p->alu_temps |= 1 << dest.idx;
+       
+   p->program->NumAluInstructions++;
+   return dest;
+}
+
+static struct ureg emit_texld( struct texenv_fragment_program *p,
+			       GLuint op,
+			       struct ureg dest,
+			       GLuint destmask,
+			       GLuint tex_unit,
+			       GLuint tex_idx,
+			       struct ureg coord )
+{
+   struct fp_instruction *inst = emit_op( p, op, 
+					  dest, destmask, 
+					  0,		/* don't saturate? */
+					  coord, 	/* arg 0? */
+					  undef,
+					  undef);
+   
+   inst->TexSrcIdx = tex_idx;
+   inst->TexSrcUnit = tex_unit;
+
+   p->program->NumTexInstructions++;
+
+   /* Is this a texture indirection?
+    */
+   if ((coord.file == PROGRAM_TEMPORARY &&
+	(p->temps_output & (1<<coord.idx))) ||
+       (dest.file == PROGRAM_TEMPORARY &&
+	(p->alu_temps & (1<<dest.idx)))) {
+      p->program->NumTexIndirections++;
+      p->temps_output = 1<<coord.idx;
+      p->alu_temps = 0;
+      assert(0);		/* KW: texture env crossbar */
+   }
+
+   return dest;
+}
+
+
+static struct ureg register_const4f( struct texenv_fragment_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_scalar_const(p, s0)    register_const4f(p, s0, s0, s0, s0)
+#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 struct ureg get_one( struct texenv_fragment_program *p )
+{
+   if (is_undef(p->one)) 
+      p->one = register_scalar_const(p, 1.0);
+   return p->one;
+}
+
+static struct ureg get_half( struct texenv_fragment_program *p )
+{
+   if (is_undef(p->half)) 
+      p->one = register_scalar_const(p, 0.5);
+   return p->half;
+}
+
+static struct ureg get_zero( struct texenv_fragment_program *p )
+{
+   if (is_undef(p->zero)) 
+      p->one = register_scalar_const(p, 0.0);
+   return p->zero;
+}
+
+
+
+
+
+static void program_error( struct texenv_fragment_program *p, const char *msg )
+{
+   _mesa_problem(NULL, msg);
+   p->error = 1;
+}
+
+static struct ureg get_source( struct texenv_fragment_program *p, 
+			       GLuint src, GLuint unit )
+{
+   switch (src) {
+   case SRC_TEXTURE: 
+      assert(!is_undef(p->src_texture[unit]));
+      return p->src_texture[unit];
+
+   case SRC_TEXTURE0:
+   case SRC_TEXTURE1:
+   case SRC_TEXTURE2:
+   case SRC_TEXTURE3:
+   case SRC_TEXTURE4:
+   case SRC_TEXTURE5:
+   case SRC_TEXTURE6:
+   case SRC_TEXTURE7: 
+      assert(!is_undef(p->src_texture[src - SRC_TEXTURE0]));
+      return p->src_texture[src - SRC_TEXTURE0];
+
+   case SRC_CONSTANT:
+      return register_param2(p, STATE_TEXENV_COLOR, unit);
+
+   case SRC_PRIMARY_COLOR:
+      return register_input(p, FRAG_ATTRIB_COL0);
+
+   case SRC_PREVIOUS:
+   default:
+      if (is_undef(p->src_previous))
+	 return register_input(p, FRAG_ATTRIB_COL0);
+      else
+	 return p->src_previous;
+   }
+}
+
+static struct ureg emit_combine_source( struct texenv_fragment_program *p, 
+					GLuint mask,
+					GLuint unit,
+					GLuint source, 
+					GLuint operand )
+{
+   struct ureg arg, src, one;
+
+   src = get_source(p, source, unit);
+
+   switch (operand) {
+   case OPR_ONE_MINUS_SRC_COLOR: 
+      /* Get unused tmp,
+       * Emit tmp = 1.0 - arg.xyzw
+       */
+      arg = get_temp( p );
+      one = get_one( p );
+      return emit_arith( p, FP_OPCODE_SUB, arg, mask, 0, one, src, undef);
+
+   case OPR_SRC_ALPHA: 
+      if (mask == WRITEMASK_W)
+	 return src;
+      else
+	 return swizzle1( src, W );
+   case OPR_ONE_MINUS_SRC_ALPHA: 
+      /* Get unused tmp,
+       * Emit tmp = 1.0 - arg.wwww
+       */
+      arg = get_temp(p);
+      one = get_one(p);
+      return emit_arith(p, FP_OPCODE_SUB, arg, mask, 0,
+			one, swizzle1(src, W), undef);
+   case OPR_ZERO:
+      return get_zero(p);
+   case OPR_ONE:
+      return get_one(p);
+   case OPR_SRC_COLOR: 
+   default:
+      return src;
+   }
+}
+
+static GLboolean args_match( struct state_key *key, GLuint unit )
+{
+   int i, nr = key->unit[unit].NumArgsRGB;
+
+   for (i = 0 ; i < nr ; i++) {
+      if (key->unit[unit].OptA[i].Source != key->unit[unit].OptRGB[i].Source) 
+	 return GL_FALSE;
+
+      switch(key->unit[unit].OptA[i].Operand) {
+      case OPR_SRC_ALPHA: 
+	 switch(key->unit[unit].OptRGB[i].Operand) {
+	 case OPR_SRC_COLOR: 
+	 case OPR_SRC_ALPHA: 
+	    break;
+	 default:
+	    return GL_FALSE;
+	 }
+	 break;
+      case OPR_ONE_MINUS_SRC_ALPHA: 
+	 switch(key->unit[unit].OptRGB[i].Operand) {
+	 case OPR_ONE_MINUS_SRC_COLOR: 
+	 case OPR_ONE_MINUS_SRC_ALPHA: 
+	    break;
+	 default:
+	    return GL_FALSE;
+	 }
+	 break;
+      default: 
+	 return GL_FALSE;	/* impossible */
+      }
+   }
+
+   return GL_TRUE;
+}
+
+static struct ureg emit_combine( struct texenv_fragment_program *p,
+				 struct ureg dest,
+				 GLuint mask,
+				 GLuint saturate,
+				 GLuint unit,
+				 GLuint nr,
+				 GLuint mode,
+				 struct mode_opt *opt)
+{
+   struct ureg src[3];
+   struct ureg tmp, half;
+   int i;
+
+   for (i = 0; i < nr; i++)
+      src[i] = emit_combine_source( p, mask, unit, opt[i].Source, opt[i].Operand );
+
+   switch (mode) {
+   case MODE_REPLACE: 
+      if (mask == WRITEMASK_XYZW && !saturate)
+	 return src[0];
+      else
+	 return emit_arith( p, FP_OPCODE_MOV, dest, mask, saturate, src[0], undef, undef );
+   case MODE_MODULATE: 
+      return emit_arith( p, FP_OPCODE_MUL, dest, mask, saturate,
+			 src[0], src[1], undef );
+   case MODE_ADD: 
+      return emit_arith( p, FP_OPCODE_ADD, dest, mask, saturate, 
+			 src[0], src[1], undef );
+   case MODE_ADD_SIGNED:
+      /* tmp = arg0 + arg1
+       * result = tmp - .5
+       */
+      half = get_half(p);
+      emit_arith( p, FP_OPCODE_ADD, tmp, mask, 0, src[0], src[1], undef );
+      emit_arith( p, FP_OPCODE_SUB, dest, mask, saturate, tmp, half, undef );
+      return dest;
+   case MODE_INTERPOLATE: 
+      /* Arg0 * (Arg2) + Arg1 * (1-Arg2) -- note arguments are reordered:
+       */
+      return emit_arith( p, FP_OPCODE_LRP, dest, mask, saturate, src[2], src[0], src[1] );
+
+   case MODE_SUBTRACT: 
+      return emit_arith( p, FP_OPCODE_SUB, dest, mask, saturate, src[0], src[1], undef );
+
+   case MODE_DOT3_RGBA:
+   case MODE_DOT3_RGBA_EXT: 
+   case MODE_DOT3_RGB_EXT:
+   case MODE_DOT3_RGB: {
+      struct ureg tmp0 = get_temp( p );
+      struct ureg tmp1 = get_temp( p );
+      struct ureg neg1 = register_scalar_const(p, -1);
+      struct ureg two  = register_scalar_const(p, 2);
+
+      /* tmp0 = 2*src0 - 1
+       * tmp1 = 2*src1 - 1
+       *
+       * dst = tmp0 dot3 tmp1 
+       */
+      emit_arith( p, FP_OPCODE_MAD, tmp0, WRITEMASK_XYZW, 0, 
+		  two, src[0], neg1);
+
+      if (memcmp(&src[0], &src[1], sizeof(struct ureg)) == 0)
+	 tmp1 = tmp0;
+      else
+	 emit_arith( p, FP_OPCODE_MAD, tmp1, WRITEMASK_XYZW, 0, 
+		     two, src[1], neg1);
+      emit_arith( p, FP_OPCODE_DP3, dest, mask, saturate, tmp0, tmp1, undef);
+      return dest;
+   }
+   case MODE_MODULATE_ADD_ATI:
+      /* Arg0 * Arg2 + Arg1 */
+      return emit_arith( p, FP_OPCODE_MAD, dest, mask, saturate,
+			 src[0], src[2], src[1] );
+   case MODE_MODULATE_SIGNED_ADD_ATI: {
+      /* Arg0 * Arg2 + Arg1 - 0.5 */
+      struct ureg tmp0 = get_temp(p);
+      half = get_half(p);
+      emit_arith( p, FP_OPCODE_MAD, tmp0, mask, 0, src[0], src[2], src[1] );
+      emit_arith( p, FP_OPCODE_SUB, dest, mask, saturate, tmp0, half, undef );
+      return dest;
+   }
+   case MODE_MODULATE_SUBTRACT_ATI:
+      /* Arg0 * Arg2 - Arg1 */
+      emit_arith( p, FP_OPCODE_MAD, dest, mask, 0, src[0], src[2], negate(src[1]) );
+      return dest;
+   default: 
+      return src[0];
+   }
+}
+
+
+static struct ureg emit_texenv( struct texenv_fragment_program *p, int unit )
+{
+   struct state_key *key = p->state;
+   GLuint saturate = (unit < p->last_tex_stage);
+   GLuint rgb_shift, alpha_shift;
+   struct ureg out, shift;
+   struct ureg dest;
+
+   if (!key->unit[unit].enabled) {
+      return get_source(p, SRC_PREVIOUS, 0);
+   }
+   
+   switch (key->unit[unit].ModeRGB) {
+   case MODE_DOT3_RGB_EXT:
+      alpha_shift = key->unit[unit].ScaleShiftA;
+      rgb_shift = 0;
+      break;
+   case MODE_DOT3_RGBA_EXT:
+      alpha_shift = 0;
+      rgb_shift = 0;
+      break;
+   default:
+      rgb_shift = key->unit[unit].ScaleShiftRGB;
+      alpha_shift = key->unit[unit].ScaleShiftA;
+      break;
+   }
+   
+   /* If this is the very last calculation, emit direct to output reg:
+    */
+   if (key->separate_specular ||
+       unit != p->last_tex_stage ||
+       alpha_shift ||
+       rgb_shift)
+      dest = get_temp( p );
+   else
+      dest = make_ureg(PROGRAM_OUTPUT, FRAG_OUTPUT_COLR);
+
+   /* Emit the RGB and A combine ops
+    */
+   if (key->unit[unit].ModeRGB == key->unit[unit].ModeA &&
+       args_match(key, unit)) {
+      out = emit_combine( p, dest, WRITEMASK_XYZW, saturate,
+			  unit,
+			  key->unit[unit].NumArgsRGB,
+			  key->unit[unit].ModeRGB,
+			  key->unit[unit].OptRGB);
+   }
+   else if (key->unit[unit].ModeRGB == MODE_DOT3_RGBA_EXT ||
+	    key->unit[unit].ModeA == MODE_DOT3_RGBA) {
+
+      out = emit_combine( p, dest, WRITEMASK_XYZW, saturate,
+			  unit,
+			  key->unit[unit].NumArgsRGB,
+			  key->unit[unit].ModeRGB,
+			  key->unit[unit].OptRGB);
+   }
+   else {
+      /* Need to do something to stop from re-emitting identical
+       * argument calculations here:
+       */
+      out = emit_combine( p, dest, WRITEMASK_XYZ, saturate,
+			  unit,
+			  key->unit[unit].NumArgsRGB,
+			  key->unit[unit].ModeRGB,
+			  key->unit[unit].OptRGB);
+      out = emit_combine( p, dest, WRITEMASK_W, saturate,
+			  unit,
+			  key->unit[unit].NumArgsA,
+			  key->unit[unit].ModeA,
+			  key->unit[unit].OptA);
+   }
+
+   /* Deal with the final shift:
+    */
+   if (alpha_shift || rgb_shift) {
+      if (rgb_shift == alpha_shift) {
+	 shift = register_scalar_const(p, 1<<rgb_shift);
+      }
+      else {
+	 shift = register_const4f(p, 
+				  1<<rgb_shift,
+				  1<<rgb_shift,
+				  1<<rgb_shift,
+				  1<<alpha_shift);
+      }
+      return emit_arith( p, FP_OPCODE_MUL, dest, WRITEMASK_XYZW, 
+			 saturate, out, shift, undef );
+   }
+   else
+      return out;
+}
+
+
+
+static void load_texture( struct texenv_fragment_program *p, GLuint unit )
+{
+   if (is_undef(p->src_texture[unit])) {
+      GLuint dim = p->state->unit[unit].source_index;
+      struct ureg texcoord = register_input(p, FRAG_ATTRIB_TEX0+unit);
+      struct ureg tmp = get_tex_temp( p );
+
+      if (dim == TEXTURE_UNKNOWN_INDEX)
+         program_error(p, "TexSrcBit");
+			  
+      /* TODO: Use D0_MASK_XY where possible.
+       */
+      p->src_texture[unit] = emit_texld( p, FP_OPCODE_TXP,
+					 tmp, WRITEMASK_XYZW, 
+					 unit, dim, texcoord );
+   }
+}
+
+static GLboolean load_texenv_source( struct texenv_fragment_program *p, 
+				     GLuint src, GLuint unit )
+{
+   switch (src) {
+   case SRC_TEXTURE: 
+      load_texture(p, unit);
+      break;
+
+   case SRC_TEXTURE0:
+   case SRC_TEXTURE1:
+   case SRC_TEXTURE2:
+   case SRC_TEXTURE3:
+   case SRC_TEXTURE4:
+   case SRC_TEXTURE5:
+   case SRC_TEXTURE6:
+   case SRC_TEXTURE7:       
+      if (!p->state->unit[src - SRC_TEXTURE0].enabled) 
+	 return GL_FALSE;
+      load_texture(p, src - SRC_TEXTURE0);
+      break;
+      
+   default:
+      break;
+   }
+ 
+   return GL_TRUE;
+}
+
+static GLboolean load_texunit_sources( struct texenv_fragment_program *p, int unit )
+{
+   struct state_key *key = p->state;
+   int i, nr = key->unit[unit].NumArgsRGB;
+   for (i = 0; i < nr; i++) {
+      if (!load_texenv_source( p, key->unit[unit].OptRGB[i].Source, unit) ||
+	  !load_texenv_source( p, key->unit[unit].OptA[i].Source, unit ))
+	 return GL_FALSE;
+   }
+   return GL_TRUE;
+}
+
+static void create_new_program(struct state_key *key, GLcontext *ctx,
+			       struct fragment_program *program)
+{
+   struct texenv_fragment_program p;
+   GLuint unit;
+   struct ureg cf, out;
+
+   _mesa_memset(&p, 0, sizeof(p));
+   p.ctx = ctx;
+   p.state = key;
+   p.program = program;
+
+   p.program->Instructions = MALLOC(sizeof(struct fp_instruction) * 100);
+   p.program->Base.NumInstructions = 0;
+   p.program->Base.Target = GL_FRAGMENT_PROGRAM_ARB;
+   p.program->NumTexIndirections = 1;	/* correct? */
+   p.program->NumTexInstructions = 0;
+   p.program->NumAluInstructions = 0;
+   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;
+   p.program->Parameters = _mesa_new_parameter_list();
+
+   p.program->InputsRead = 0;
+   p.program->OutputsWritten = 1 << FRAG_OUTPUT_COLR;
+
+   for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++)
+      p.src_texture[unit] = undef;
+
+   p.src_previous = undef;
+   p.last_tex_stage = 0;
+   release_temps(&p);
+
+   if (key->enabled_units) {
+      /* First pass - to support texture_env_crossbar, first identify
+       * all referenced texture sources and emit texld instructions
+       * for each:
+       */
+      for (unit = 0 ; unit < ctx->Const.MaxTextureUnits ; unit++)
+	 if (key->unit[unit].enabled) {
+	    if (load_texunit_sources( &p, unit ))
+	       p.last_tex_stage = unit;
+	 }
+
+      /* Second pass - emit combine instructions to build final color:
+       */
+      for (unit = 0 ; unit < ctx->Const.MaxTextureUnits; unit++)
+	 if (key->enabled_units & (1<<unit)) {
+	    p.src_previous = emit_texenv( &p, unit );
+	    release_temps(&p);	/* release all temps */
+	 }
+   }
+
+   cf = get_source( &p, SRC_PREVIOUS, 0 );
+   out = make_ureg( PROGRAM_OUTPUT, FRAG_OUTPUT_COLR );
+
+   if (key->separate_specular) {
+      /* Emit specular add.
+       */
+      struct ureg s = register_input(&p, FRAG_ATTRIB_COL1);
+      emit_arith( &p, FP_OPCODE_ADD, out, WRITEMASK_XYZ, 0, cf, s, undef );
+   }
+   else if (memcmp(&cf, &out, sizeof(cf)) != 0) {
+      /* Will wind up in here if no texture enabled or a couple of
+       * other scenarios (GL_REPLACE for instance).
+       */
+      emit_arith( &p, FP_OPCODE_MOV, out, WRITEMASK_XYZW, 0, cf, undef, undef );
+   }
+
+   /* Finish up:
+    */
+   emit_arith( &p, FP_OPCODE_END, undef, WRITEMASK_XYZW, 0, undef, undef, undef);
+
+   if (key->fog_enabled) {
+      /* Pull fog mode from GLcontext, the value in the state key is
+       * a reduced value and not what is expected in FogOption
+       */
+      p.program->FogOption = ctx->Fog.Mode;
+   } else
+      p.program->FogOption = GL_NONE;
+
+   if (p.program->NumTexIndirections > ctx->Const.MaxFragmentProgramTexIndirections) 
+      program_error(&p, "Exceeded max nr indirect texture lookups");
+
+   if (p.program->NumTexInstructions > ctx->Const.MaxFragmentProgramTexInstructions)
+      program_error(&p, "Exceeded max TEX instructions");
+
+   if (p.program->NumAluInstructions > ctx->Const.MaxFragmentProgramAluInstructions)
+      program_error(&p, "Exceeded max ALU instructions");
+
+
+   /* Notify driver the fragment program has (actually) changed.
+    */
+   if (ctx->Driver.ProgramStringNotify || DISASSEM) {
+      if (ctx->Driver.ProgramStringNotify)
+	 ctx->Driver.ProgramStringNotify( ctx, GL_FRAGMENT_PROGRAM_ARB, 
+					  &p.program->Base );
+
+      if (DISASSEM) {
+	 _mesa_debug_fp_inst(p.program->NumTexInstructions + p.program->NumAluInstructions,
+			     p.program->Instructions);
+	 _mesa_printf("\n");
+      }
+      
+   }
+
+}
+
+static void *search_cache( struct texenvprog_cache *cache,
+			   GLuint hash,
+			   const void *key,
+			   GLuint keysize)
+{
+   struct texenvprog_cache *c;
+
+   for (c = cache; c; c = c->next) {
+      if (c->hash == hash && memcmp(c->key, key, keysize) == 0)
+	 return c->data;
+   }
+
+   return NULL;
+}
+
+static void cache_item( struct texenvprog_cache **cache,
+			GLuint hash,
+			void *key,
+			void *data )
+{
+   struct texenvprog_cache *c = MALLOC(sizeof(*c));
+   c->hash = hash;
+   c->key = key;
+   c->data = data;
+   c->next = *cache;
+   *cache = c;
+}
+
+static GLuint hash_key( struct state_key *key )
+{
+   GLuint *ikey = (GLuint *)key;
+   GLuint hash = 0, i;
+
+   /* I'm sure this can be improved on, but speed is important:
+    */
+   for (i = 0; i < sizeof(*key)/sizeof(GLuint); i++)
+      hash ^= ikey[i];
+
+   return hash;
+}
+
+void _mesa_UpdateTexEnvProgram( GLcontext *ctx )
+{
+   struct state_key *key;
+   GLuint hash;
+	
+   if (ctx->FragmentProgram._Enabled)
+      return;
+	
+   key = make_state_key(ctx);
+   hash = hash_key(key);
+
+   ctx->FragmentProgram._Current = ctx->_TexEnvProgram =
+      (struct fragment_program *)
+      search_cache(ctx->Texture.env_fp_cache, hash, key, sizeof(*key));
+	
+   if (!ctx->_TexEnvProgram) {
+      if (0) _mesa_printf("Building new texenv proggy for key %x\n", hash);
+		
+      ctx->FragmentProgram._Current = ctx->_TexEnvProgram = 
+	 (struct fragment_program *) 
+	 ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
+		
+      create_new_program(key, ctx, ctx->_TexEnvProgram);
+
+      cache_item(&ctx->Texture.env_fp_cache, hash, key, ctx->_TexEnvProgram);
+   } else {
+      FREE(key);
+      if (0) _mesa_printf("Found existing texenv program for key %x\n", hash);
+   }
+	
+}
+
+void _mesa_TexEnvProgramCacheDestroy( GLcontext *ctx )
+{
+   struct texenvprog_cache *a, *tmp;
+
+   for (a = ctx->Texture.env_fp_cache; a; a = tmp) {
+      tmp = a->next;
+      FREE(a->key);
+      FREE(a->data);
+      FREE(a);
+   }
+}
+