src/gallium/drivers/r300/r300_fs.c - fp2-dev/platform/external/mesa3d - Gitiles

 /*
  * Copyright 2008 Corbin Simpson <MostAwesomeDude@gmail.com>
  *                Joakim Sindholt <opensource@zhasha.com>
  * Copyright 2009 Marek Olšák <maraeo@gmail.com>
  *
  * 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
  * on 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
  * THE AUTHOR(S) AND/OR THEIR 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 "util/u_math.h"
 #include "util/u_memory.h"

 #include "tgsi/tgsi_dump.h"
 #include "tgsi/tgsi_ureg.h"

 #include "r300_cb.h"
 #include "r300_context.h"
 #include "r300_emit.h"
 #include "r300_screen.h"
 #include "r300_fs.h"
 #include "r300_reg.h"
 #include "r300_tgsi_to_rc.h"

 #include "radeon_code.h"
 #include "radeon_compiler.h"

 /* Convert info about FS input semantics to r300_shader_semantics. */
 void r300_shader_read_fs_inputs(struct tgsi_shader_info* info,
                                 struct r300_shader_semantics* fs_inputs)
 {
     int i;
     unsigned index;

     r300_shader_semantics_reset(fs_inputs);

     for (i = 0; i < info->num_inputs; i++) {
         index = info->input_semantic_index[i];

         switch (info->input_semantic_name[i]) {
             case TGSI_SEMANTIC_COLOR:
                 assert(index < ATTR_COLOR_COUNT);
                 fs_inputs->color[index] = i;
                 break;

             case TGSI_SEMANTIC_GENERIC:
                 assert(index < ATTR_GENERIC_COUNT);
                 fs_inputs->generic[index] = i;
                 break;

             case TGSI_SEMANTIC_FOG:
                 assert(index == 0);
                 fs_inputs->fog = i;
                 break;

             case TGSI_SEMANTIC_POSITION:
                 assert(index == 0);
                 fs_inputs->wpos = i;
                 break;

             default:
                 fprintf(stderr, "r300: FP: Unknown input semantic: %i\n",
                         info->input_semantic_name[i]);
         }
     }
 }

 static void find_output_registers(struct r300_fragment_program_compiler * compiler,
                                   struct r300_fragment_shader_code *shader)
 {
     unsigned i, colorbuf_count = 0;

     /* Mark the outputs as not present initially */
     compiler->OutputColor[0] = shader->info.num_outputs;
     compiler->OutputColor[1] = shader->info.num_outputs;
     compiler->OutputColor[2] = shader->info.num_outputs;
     compiler->OutputColor[3] = shader->info.num_outputs;
     compiler->OutputDepth = shader->info.num_outputs;

     /* Now see where they really are. */
     for(i = 0; i < shader->info.num_outputs; ++i) {
         switch(shader->info.output_semantic_name[i]) {
             case TGSI_SEMANTIC_COLOR:
                 compiler->OutputColor[colorbuf_count] = i;
                 colorbuf_count++;
                 break;
             case TGSI_SEMANTIC_POSITION:
                 compiler->OutputDepth = i;
                 break;
         }
     }
 }

 static void allocate_hardware_inputs(
     struct r300_fragment_program_compiler * c,
     void (*allocate)(void * data, unsigned input, unsigned hwreg),
     void * mydata)
 {
     struct r300_shader_semantics* inputs =
         (struct r300_shader_semantics*)c->UserData;
     int i, reg = 0;

     /* Allocate input registers. */
     for (i = 0; i < ATTR_COLOR_COUNT; i++) {
         if (inputs->color[i] != ATTR_UNUSED) {
             allocate(mydata, inputs->color[i], reg++);
         }
     }
     for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
         if (inputs->generic[i] != ATTR_UNUSED) {
             allocate(mydata, inputs->generic[i], reg++);
         }
     }
     if (inputs->fog != ATTR_UNUSED) {
         allocate(mydata, inputs->fog, reg++);
     }
     if (inputs->wpos != ATTR_UNUSED) {
         allocate(mydata, inputs->wpos, reg++);
     }
 }

 static void get_external_state(
     struct r300_context* r300,
     struct r300_fragment_program_external_state* state)
 {
     struct r300_textures_state *texstate = r300->textures_state.state;
     unsigned i;
     unsigned char *swizzle;

     for (i = 0; i < texstate->sampler_state_count; i++) {
         struct r300_sampler_state* s = texstate->sampler_states[i];

         if (!s) {
             continue;
         }

         if (s->state.compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
             state->unit[i].compare_mode_enabled = 1;

             /* Pass depth texture swizzling to the compiler. */
             if (texstate->sampler_views[i]) {
                 swizzle = texstate->sampler_views[i]->swizzle;

                 state->unit[i].depth_texture_swizzle =
                     RC_MAKE_SWIZZLE(swizzle[0], swizzle[1],
                                     swizzle[2], swizzle[3]);
             } else {
                 state->unit[i].depth_texture_swizzle = RC_SWIZZLE_XYZW;
             }

             /* Fortunately, no need to translate this. */
             state->unit[i].texture_compare_func = s->state.compare_func;
         }

         state->unit[i].non_normalized_coords = !s->state.normalized_coords;

         if (texstate->sampler_views[i]) {
             struct r300_texture *t;
             t = (struct r300_texture*)texstate->sampler_views[i]->base.texture;

             /* XXX this should probably take into account STR, not just S. */
             if (t->uses_pitch) {
                 switch (s->state.wrap_s) {
                     case PIPE_TEX_WRAP_REPEAT:
                         state->unit[i].wrap_mode = RC_WRAP_REPEAT;
                         state->unit[i].fake_npot = TRUE;
                         break;

                     case PIPE_TEX_WRAP_MIRROR_REPEAT:
                         state->unit[i].wrap_mode = RC_WRAP_MIRRORED_REPEAT;
                         state->unit[i].fake_npot = TRUE;
                         break;

                     case PIPE_TEX_WRAP_MIRROR_CLAMP:
                     case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
                     case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
                         state->unit[i].wrap_mode = RC_WRAP_MIRRORED_CLAMP;
                         state->unit[i].fake_npot = TRUE;
                         break;

                     default:
                         state->unit[i].wrap_mode = RC_WRAP_NONE;
                         break;
                 }
             }
         }
     }
 }

 static void r300_translate_fragment_shader(
     struct r300_context* r300,
     struct r300_fragment_shader_code* shader,
     const struct tgsi_token *tokens);

 static void r300_dummy_fragment_shader(
     struct r300_context* r300,
     struct r300_fragment_shader_code* shader)
 {
     struct pipe_shader_state state;
     struct ureg_program *ureg;
     struct ureg_dst out;
     struct ureg_src imm;

     /* Make a simple fragment shader which outputs (0, 0, 0, 1) */
     ureg = ureg_create(TGSI_PROCESSOR_FRAGMENT);
     out = ureg_DECL_output(ureg, TGSI_SEMANTIC_COLOR, 0);
     imm = ureg_imm4f(ureg, 0, 0, 0, 1);

     ureg_MOV(ureg, out, imm);
     ureg_END(ureg);

     state.tokens = ureg_finalize(ureg);

     shader->dummy = TRUE;
     r300_translate_fragment_shader(r300, shader, state.tokens);

     ureg_destroy(ureg);
 }

 static void r300_emit_fs_code_to_buffer(
     struct r300_context *r300,
     struct r300_fragment_shader_code *shader)
 {
     struct rX00_fragment_program_code *generic_code = &shader->code;
     unsigned imm_count = shader->immediates_count;
     unsigned imm_first = shader->externals_count;
     unsigned imm_end = generic_code->constants.Count;
     struct rc_constant *constants = generic_code->constants.Constants;
     unsigned i;
     CB_LOCALS;

     if (r300->screen->caps.is_r500) {
         struct r500_fragment_program_code *code = &generic_code->code.r500;

         shader->cb_code_size = 17 +
                                ((code->inst_end + 1) * 6) +
                                imm_count * 7;

         NEW_CB(shader->cb_code, shader->cb_code_size);
         OUT_CB_REG(R500_US_CONFIG, R500_ZERO_TIMES_ANYTHING_EQUALS_ZERO);
         OUT_CB_REG(R500_US_PIXSIZE, code->max_temp_idx);
         OUT_CB_REG(R500_US_CODE_RANGE,
                    R500_US_CODE_RANGE_ADDR(0) | R500_US_CODE_RANGE_SIZE(code->inst_end));
         OUT_CB_REG(R500_US_CODE_OFFSET, 0);
         OUT_CB_REG(R500_US_CODE_ADDR,
                    R500_US_CODE_START_ADDR(0) | R500_US_CODE_END_ADDR(code->inst_end));

         OUT_CB_REG(R500_GA_US_VECTOR_INDEX, R500_GA_US_VECTOR_INDEX_TYPE_INSTR);
         OUT_CB_ONE_REG(R500_GA_US_VECTOR_DATA, (code->inst_end + 1) * 6);
         for (i = 0; i <= code->inst_end; i++) {
             OUT_CB(code->inst[i].inst0);
             OUT_CB(code->inst[i].inst1);
             OUT_CB(code->inst[i].inst2);
             OUT_CB(code->inst[i].inst3);
             OUT_CB(code->inst[i].inst4);
             OUT_CB(code->inst[i].inst5);
         }

         /* Emit immediates. */
         if (imm_count) {
             for(i = imm_first; i < imm_end; ++i) {
                 if (constants[i].Type == RC_CONSTANT_IMMEDIATE) {
                     const float *data = constants[i].u.Immediate;

                     OUT_CB_REG(R500_GA_US_VECTOR_INDEX,
                                R500_GA_US_VECTOR_INDEX_TYPE_CONST |
                                (i & R500_GA_US_VECTOR_INDEX_MASK));
                     OUT_CB_ONE_REG(R500_GA_US_VECTOR_DATA, 4);
                     OUT_CB_TABLE(data, 4);
                 }
             }
         }
     } else { /* r300 */
         struct r300_fragment_program_code *code = &generic_code->code.r300;

         shader->cb_code_size = 19 +
                                (r300->screen->caps.is_r400 ? 2 : 0) +
                                code->alu.length * 4 +
                                (code->tex.length ? (1 + code->tex.length) : 0) +
                                imm_count * 5;

         NEW_CB(shader->cb_code, shader->cb_code_size);

         if (r300->screen->caps.is_r400)
             OUT_CB_REG(R400_US_CODE_BANK, 0);

         OUT_CB_REG(R300_US_CONFIG, code->config);
         OUT_CB_REG(R300_US_PIXSIZE, code->pixsize);
         OUT_CB_REG(R300_US_CODE_OFFSET, code->code_offset);

         OUT_CB_REG_SEQ(R300_US_CODE_ADDR_0, 4);
         OUT_CB_TABLE(code->code_addr, 4);

         OUT_CB_REG_SEQ(R300_US_ALU_RGB_INST_0, code->alu.length);
         for (i = 0; i < code->alu.length; i++)
             OUT_CB(code->alu.inst[i].rgb_inst);

         OUT_CB_REG_SEQ(R300_US_ALU_RGB_ADDR_0, code->alu.length);
         for (i = 0; i < code->alu.length; i++)
             OUT_CB(code->alu.inst[i].rgb_addr);

         OUT_CB_REG_SEQ(R300_US_ALU_ALPHA_INST_0, code->alu.length);
         for (i = 0; i < code->alu.length; i++)
             OUT_CB(code->alu.inst[i].alpha_inst);

         OUT_CB_REG_SEQ(R300_US_ALU_ALPHA_ADDR_0, code->alu.length);
         for (i = 0; i < code->alu.length; i++)
             OUT_CB(code->alu.inst[i].alpha_addr);

         if (code->tex.length) {
             OUT_CB_REG_SEQ(R300_US_TEX_INST_0, code->tex.length);
             OUT_CB_TABLE(code->tex.inst, code->tex.length);
         }

         /* Emit immediates. */
         if (imm_count) {
             for(i = imm_first; i < imm_end; ++i) {
                 if (constants[i].Type == RC_CONSTANT_IMMEDIATE) {
                     const float *data = constants[i].u.Immediate;

                     OUT_CB_REG_SEQ(R300_PFS_PARAM_0_X + i * 16, 4);
                     OUT_CB(pack_float24(data[0]));
                     OUT_CB(pack_float24(data[1]));
                     OUT_CB(pack_float24(data[2]));
                     OUT_CB(pack_float24(data[3]));
                 }
             }
         }
     }

     OUT_CB_REG(R300_FG_DEPTH_SRC, shader->fg_depth_src);
     OUT_CB_REG(R300_US_W_FMT, shader->us_out_w);
     END_CB;
 }

 static void r300_translate_fragment_shader(
     struct r300_context* r300,
     struct r300_fragment_shader_code* shader,
     const struct tgsi_token *tokens)
 {
     struct r300_fragment_program_compiler compiler;
     struct tgsi_to_rc ttr;
     int wpos;
     unsigned i;

     tgsi_scan_shader(tokens, &shader->info);
     r300_shader_read_fs_inputs(&shader->info, &shader->inputs);

     wpos = shader->inputs.wpos;

     /* Setup the compiler. */
     memset(&compiler, 0, sizeof(compiler));
     rc_init(&compiler.Base);
     compiler.Base.Debug = DBG_ON(r300, DBG_FP);

     compiler.code = &shader->code;
     compiler.state = shader->compare_state;
     compiler.Base.is_r500 = r300->screen->caps.is_r500;
     compiler.Base.max_temp_regs = compiler.Base.is_r500 ? 128 : 32;
     compiler.AllocateHwInputs = &allocate_hardware_inputs;
     compiler.UserData = &shader->inputs;

     find_output_registers(&compiler, shader);

     if (compiler.Base.Debug) {
         debug_printf("r300: Initial fragment program\n");
         tgsi_dump(tokens, 0);
     }

     /* Translate TGSI to our internal representation */
     ttr.compiler = &compiler.Base;
     ttr.info = &shader->info;
     ttr.use_half_swizzles = TRUE;

     r300_tgsi_to_rc(&ttr, tokens);

     /**
      * Transform the program to support WPOS.
      *
      * Introduce a small fragment at the start of the program that will be
      * the only code that directly reads the WPOS input.
      * All other code pieces that reference that input will be rewritten
      * to read from a newly allocated temporary. */
     if (wpos != ATTR_UNUSED) {
         /* Moving the input to some other reg is not really necessary. */
         rc_transform_fragment_wpos(&compiler.Base, wpos, wpos, TRUE);
     }

     /* Invoke the compiler */
     r3xx_compile_fragment_program(&compiler);

     /* Shaders with zero instructions are invalid,
      * use the dummy shader instead. */
     if (shader->code.code.r500.inst_end == -1) {
         rc_destroy(&compiler.Base);
         r300_dummy_fragment_shader(r300, shader);
         return;
     }

     if (compiler.Base.Error) {
         fprintf(stderr, "r300 FP: Compiler Error:\n%sUsing a dummy shader"
                 " instead.\nIf there's an 'unknown opcode' message, please"
                 " file a bug report and attach this log.\n", compiler.Base.ErrorMsg);

         if (shader->dummy) {
             fprintf(stderr, "r300 FP: Cannot compile the dummy shader! "
                     "Giving up...\n");
             abort();
         }

         rc_destroy(&compiler.Base);
         r300_dummy_fragment_shader(r300, shader);
         return;
     }

     /* Initialize numbers of constants for each type. */
     shader->externals_count = ttr.immediate_offset;
     shader->immediates_count = 0;
     shader->rc_state_count = 0;

     for (i = shader->externals_count; i < shader->code.constants.Count; i++) {
         switch (shader->code.constants.Constants[i].Type) {
             case RC_CONSTANT_IMMEDIATE:
                 ++shader->immediates_count;
                 break;
             case RC_CONSTANT_STATE:
                 ++shader->rc_state_count;
                 break;
             default:
                 assert(0);
         }
     }

     /* Setup shader depth output. */
     if (shader->code.writes_depth) {
         shader->fg_depth_src = R300_FG_DEPTH_SRC_SHADER;
         shader->us_out_w = R300_W_FMT_W24 | R300_W_SRC_US;
     } else {
         shader->fg_depth_src = R300_FG_DEPTH_SRC_SCAN;
         shader->us_out_w = R300_W_FMT_W0 | R300_W_SRC_US;
     }

     /* And, finally... */
     rc_destroy(&compiler.Base);

     /* Build the command buffer. */
     r300_emit_fs_code_to_buffer(r300, shader);
 }

 boolean r300_pick_fragment_shader(struct r300_context* r300)
 {
     struct r300_fragment_shader* fs = r300_fs(r300);
     struct r300_fragment_program_external_state state = {{{ 0 }}};
     struct r300_fragment_shader_code* ptr;

     get_external_state(r300, &state);

     if (!fs->first) {
         /* Build the fragment shader for the first time. */
         fs->first = fs->shader = CALLOC_STRUCT(r300_fragment_shader_code);

         memcpy(&fs->shader->compare_state, &state,
             sizeof(struct r300_fragment_program_external_state));
         r300_translate_fragment_shader(r300, fs->shader, fs->state.tokens);
         return TRUE;

     } else {
         /* Check if the currently-bound shader has been compiled
          * with the texture-compare state we need. */
         if (memcmp(&fs->shader->compare_state, &state, sizeof(state)) != 0) {
             /* Search for the right shader. */
             ptr = fs->first;
             while (ptr) {
                 if (memcmp(&ptr->compare_state, &state, sizeof(state)) == 0) {
                     if (fs->shader != ptr) {
                         fs->shader = ptr;
                         return TRUE;
                     }
                     /* The currently-bound one is OK. */
                     return FALSE;
                 }
                 ptr = ptr->next;
             }

             /* Not found, gotta compile a new one. */
             ptr = CALLOC_STRUCT(r300_fragment_shader_code);
             ptr->next = fs->first;
             fs->first = fs->shader = ptr;

             ptr->compare_state = state;
             r300_translate_fragment_shader(r300, ptr, fs->state.tokens);
             return TRUE;
         }
     }

     return FALSE;
 }
	/*
	* Copyright 2008 Corbin Simpson <MostAwesomeDude@gmail.com>
	* Joakim Sindholt <opensource@zhasha.com>
	* Copyright 2009 Marek Olšák <maraeo@gmail.com>
	*
	* 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
	* on 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
	* THE AUTHOR(S) AND/OR THEIR 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 "util/u_math.h"
	#include "util/u_memory.h"

	#include "tgsi/tgsi_dump.h"
	#include "tgsi/tgsi_ureg.h"

	#include "r300_cb.h"
	#include "r300_context.h"
	#include "r300_emit.h"
	#include "r300_screen.h"
	#include "r300_fs.h"
	#include "r300_reg.h"
	#include "r300_tgsi_to_rc.h"

	#include "radeon_code.h"
	#include "radeon_compiler.h"

	/* Convert info about FS input semantics to r300_shader_semantics. */
	void r300_shader_read_fs_inputs(struct tgsi_shader_info* info,
	struct r300_shader_semantics* fs_inputs)
	{
	int i;
	unsigned index;

	r300_shader_semantics_reset(fs_inputs);

	for (i = 0; i < info->num_inputs; i++) {
	index = info->input_semantic_index[i];

	switch (info->input_semantic_name[i]) {
	case TGSI_SEMANTIC_COLOR:
	assert(index < ATTR_COLOR_COUNT);
	fs_inputs->color[index] = i;
	break;

	case TGSI_SEMANTIC_GENERIC:
	assert(index < ATTR_GENERIC_COUNT);
	fs_inputs->generic[index] = i;
	break;

	case TGSI_SEMANTIC_FOG:
	assert(index == 0);
	fs_inputs->fog = i;
	break;

	case TGSI_SEMANTIC_POSITION:
	assert(index == 0);
	fs_inputs->wpos = i;
	break;

	default:
	fprintf(stderr, "r300: FP: Unknown input semantic: %i\n",
	info->input_semantic_name[i]);
	}
	}
	}

	static void find_output_registers(struct r300_fragment_program_compiler * compiler,
	struct r300_fragment_shader_code *shader)
	{
	unsigned i, colorbuf_count = 0;

	/* Mark the outputs as not present initially */
	compiler->OutputColor[0] = shader->info.num_outputs;
	compiler->OutputColor[1] = shader->info.num_outputs;
	compiler->OutputColor[2] = shader->info.num_outputs;
	compiler->OutputColor[3] = shader->info.num_outputs;
	compiler->OutputDepth = shader->info.num_outputs;

	/* Now see where they really are. */
	for(i = 0; i < shader->info.num_outputs; ++i) {
	switch(shader->info.output_semantic_name[i]) {
	case TGSI_SEMANTIC_COLOR:
	compiler->OutputColor[colorbuf_count] = i;
	colorbuf_count++;
	break;
	case TGSI_SEMANTIC_POSITION:
	compiler->OutputDepth = i;
	break;
	}
	}
	}

	static void allocate_hardware_inputs(
	struct r300_fragment_program_compiler * c,
	void (allocate)(void data, unsigned input, unsigned hwreg),
	void * mydata)
	{
	struct r300_shader_semantics* inputs =
	(struct r300_shader_semantics*)c->UserData;
	int i, reg = 0;

	/* Allocate input registers. */
	for (i = 0; i < ATTR_COLOR_COUNT; i++) {
	if (inputs->color[i] != ATTR_UNUSED) {
	allocate(mydata, inputs->color[i], reg++);
	}
	}
	for (i = 0; i < ATTR_GENERIC_COUNT; i++) {
	if (inputs->generic[i] != ATTR_UNUSED) {
	allocate(mydata, inputs->generic[i], reg++);
	}
	}
	if (inputs->fog != ATTR_UNUSED) {
	allocate(mydata, inputs->fog, reg++);
	}
	if (inputs->wpos != ATTR_UNUSED) {
	allocate(mydata, inputs->wpos, reg++);
	}
	}

	static void get_external_state(
	struct r300_context* r300,
	struct r300_fragment_program_external_state* state)
	{
	struct r300_textures_state *texstate = r300->textures_state.state;
	unsigned i;
	unsigned char *swizzle;

	for (i = 0; i < texstate->sampler_state_count; i++) {
	struct r300_sampler_state* s = texstate->sampler_states[i];

	if (!s) {
	continue;
	}

	if (s->state.compare_mode == PIPE_TEX_COMPARE_R_TO_TEXTURE) {
	state->unit[i].compare_mode_enabled = 1;

	/* Pass depth texture swizzling to the compiler. */
	if (texstate->sampler_views[i]) {
	swizzle = texstate->sampler_views[i]->swizzle;

	state->unit[i].depth_texture_swizzle =
	RC_MAKE_SWIZZLE(swizzle[0], swizzle[1],
	swizzle[2], swizzle[3]);
	} else {
	state->unit[i].depth_texture_swizzle = RC_SWIZZLE_XYZW;
	}

	/* Fortunately, no need to translate this. */
	state->unit[i].texture_compare_func = s->state.compare_func;
	}

	state->unit[i].non_normalized_coords = !s->state.normalized_coords;

	if (texstate->sampler_views[i]) {
	struct r300_texture *t;
	t = (struct r300_texture*)texstate->sampler_views[i]->base.texture;

	/* XXX this should probably take into account STR, not just S. */
	if (t->uses_pitch) {
	switch (s->state.wrap_s) {
	case PIPE_TEX_WRAP_REPEAT:
	state->unit[i].wrap_mode = RC_WRAP_REPEAT;
	state->unit[i].fake_npot = TRUE;
	break;

	case PIPE_TEX_WRAP_MIRROR_REPEAT:
	state->unit[i].wrap_mode = RC_WRAP_MIRRORED_REPEAT;
	state->unit[i].fake_npot = TRUE;
	break;

	case PIPE_TEX_WRAP_MIRROR_CLAMP:
	case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE:
	case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER:
	state->unit[i].wrap_mode = RC_WRAP_MIRRORED_CLAMP;
	state->unit[i].fake_npot = TRUE;
	break;

	default:
	state->unit[i].wrap_mode = RC_WRAP_NONE;
	break;
	}
	}
	}
	}
	}

	static void r300_translate_fragment_shader(
	struct r300_context* r300,
	struct r300_fragment_shader_code* shader,
	const struct tgsi_token *tokens);

	static void r300_dummy_fragment_shader(
	struct r300_context* r300,
	struct r300_fragment_shader_code* shader)
	{
	struct pipe_shader_state state;
	struct ureg_program *ureg;
	struct ureg_dst out;
	struct ureg_src imm;

	/* Make a simple fragment shader which outputs (0, 0, 0, 1) */
	ureg = ureg_create(TGSI_PROCESSOR_FRAGMENT);
	out = ureg_DECL_output(ureg, TGSI_SEMANTIC_COLOR, 0);
	imm = ureg_imm4f(ureg, 0, 0, 0, 1);

	ureg_MOV(ureg, out, imm);
	ureg_END(ureg);

	state.tokens = ureg_finalize(ureg);

	shader->dummy = TRUE;
	r300_translate_fragment_shader(r300, shader, state.tokens);

	ureg_destroy(ureg);
	}

	static void r300_emit_fs_code_to_buffer(
	struct r300_context *r300,
	struct r300_fragment_shader_code *shader)
	{
	struct rX00_fragment_program_code *generic_code = &shader->code;
	unsigned imm_count = shader->immediates_count;
	unsigned imm_first = shader->externals_count;
	unsigned imm_end = generic_code->constants.Count;
	struct rc_constant *constants = generic_code->constants.Constants;
	unsigned i;
	CB_LOCALS;

	if (r300->screen->caps.is_r500) {
	struct r500_fragment_program_code *code = &generic_code->code.r500;

	shader->cb_code_size = 17 +
	((code->inst_end + 1) * 6) +
	imm_count * 7;

	NEW_CB(shader->cb_code, shader->cb_code_size);
	OUT_CB_REG(R500_US_CONFIG, R500_ZERO_TIMES_ANYTHING_EQUALS_ZERO);
	OUT_CB_REG(R500_US_PIXSIZE, code->max_temp_idx);
	OUT_CB_REG(R500_US_CODE_RANGE,
	R500_US_CODE_RANGE_ADDR(0) \| R500_US_CODE_RANGE_SIZE(code->inst_end));
	OUT_CB_REG(R500_US_CODE_OFFSET, 0);
	OUT_CB_REG(R500_US_CODE_ADDR,
	R500_US_CODE_START_ADDR(0) \| R500_US_CODE_END_ADDR(code->inst_end));

	OUT_CB_REG(R500_GA_US_VECTOR_INDEX, R500_GA_US_VECTOR_INDEX_TYPE_INSTR);
	OUT_CB_ONE_REG(R500_GA_US_VECTOR_DATA, (code->inst_end + 1) * 6);
	for (i = 0; i <= code->inst_end; i++) {
	OUT_CB(code->inst[i].inst0);
	OUT_CB(code->inst[i].inst1);
	OUT_CB(code->inst[i].inst2);
	OUT_CB(code->inst[i].inst3);
	OUT_CB(code->inst[i].inst4);
	OUT_CB(code->inst[i].inst5);
	}

	/* Emit immediates. */
	if (imm_count) {
	for(i = imm_first; i < imm_end; ++i) {
	if (constants[i].Type == RC_CONSTANT_IMMEDIATE) {
	const float *data = constants[i].u.Immediate;

	OUT_CB_REG(R500_GA_US_VECTOR_INDEX,
	R500_GA_US_VECTOR_INDEX_TYPE_CONST \|
	(i & R500_GA_US_VECTOR_INDEX_MASK));
	OUT_CB_ONE_REG(R500_GA_US_VECTOR_DATA, 4);
	OUT_CB_TABLE(data, 4);
	}
	}
	}
	} else { /* r300 */
	struct r300_fragment_program_code *code = &generic_code->code.r300;

	shader->cb_code_size = 19 +
	(r300->screen->caps.is_r400 ? 2 : 0) +
	code->alu.length * 4 +
	(code->tex.length ? (1 + code->tex.length) : 0) +
	imm_count * 5;

	NEW_CB(shader->cb_code, shader->cb_code_size);

	if (r300->screen->caps.is_r400)
	OUT_CB_REG(R400_US_CODE_BANK, 0);

	OUT_CB_REG(R300_US_CONFIG, code->config);
	OUT_CB_REG(R300_US_PIXSIZE, code->pixsize);
	OUT_CB_REG(R300_US_CODE_OFFSET, code->code_offset);

	OUT_CB_REG_SEQ(R300_US_CODE_ADDR_0, 4);
	OUT_CB_TABLE(code->code_addr, 4);

	OUT_CB_REG_SEQ(R300_US_ALU_RGB_INST_0, code->alu.length);
	for (i = 0; i < code->alu.length; i++)
	OUT_CB(code->alu.inst[i].rgb_inst);

	OUT_CB_REG_SEQ(R300_US_ALU_RGB_ADDR_0, code->alu.length);
	for (i = 0; i < code->alu.length; i++)
	OUT_CB(code->alu.inst[i].rgb_addr);

	OUT_CB_REG_SEQ(R300_US_ALU_ALPHA_INST_0, code->alu.length);
	for (i = 0; i < code->alu.length; i++)
	OUT_CB(code->alu.inst[i].alpha_inst);

	OUT_CB_REG_SEQ(R300_US_ALU_ALPHA_ADDR_0, code->alu.length);
	for (i = 0; i < code->alu.length; i++)
	OUT_CB(code->alu.inst[i].alpha_addr);

	if (code->tex.length) {
	OUT_CB_REG_SEQ(R300_US_TEX_INST_0, code->tex.length);
	OUT_CB_TABLE(code->tex.inst, code->tex.length);
	}

	/* Emit immediates. */
	if (imm_count) {
	for(i = imm_first; i < imm_end; ++i) {
	if (constants[i].Type == RC_CONSTANT_IMMEDIATE) {
	const float *data = constants[i].u.Immediate;

	OUT_CB_REG_SEQ(R300_PFS_PARAM_0_X + i * 16, 4);
	OUT_CB(pack_float24(data[0]));
	OUT_CB(pack_float24(data[1]));
	OUT_CB(pack_float24(data[2]));
	OUT_CB(pack_float24(data[3]));
	}
	}
	}
	}

	OUT_CB_REG(R300_FG_DEPTH_SRC, shader->fg_depth_src);
	OUT_CB_REG(R300_US_W_FMT, shader->us_out_w);
	END_CB;
	}

	static void r300_translate_fragment_shader(
	struct r300_context* r300,
	struct r300_fragment_shader_code* shader,
	const struct tgsi_token *tokens)
	{
	struct r300_fragment_program_compiler compiler;
	struct tgsi_to_rc ttr;
	int wpos;
	unsigned i;

	tgsi_scan_shader(tokens, &shader->info);
	r300_shader_read_fs_inputs(&shader->info, &shader->inputs);

	wpos = shader->inputs.wpos;

	/* Setup the compiler. */
	memset(&compiler, 0, sizeof(compiler));
	rc_init(&compiler.Base);
	compiler.Base.Debug = DBG_ON(r300, DBG_FP);

	compiler.code = &shader->code;
	compiler.state = shader->compare_state;
	compiler.Base.is_r500 = r300->screen->caps.is_r500;
	compiler.Base.max_temp_regs = compiler.Base.is_r500 ? 128 : 32;
	compiler.AllocateHwInputs = &allocate_hardware_inputs;
	compiler.UserData = &shader->inputs;

	find_output_registers(&compiler, shader);

	if (compiler.Base.Debug) {
	debug_printf("r300: Initial fragment program\n");
	tgsi_dump(tokens, 0);
	}

	/* Translate TGSI to our internal representation */
	ttr.compiler = &compiler.Base;
	ttr.info = &shader->info;
	ttr.use_half_swizzles = TRUE;

	r300_tgsi_to_rc(&ttr, tokens);

	/**
	* Transform the program to support WPOS.
	*
	* Introduce a small fragment at the start of the program that will be
	* the only code that directly reads the WPOS input.
	* All other code pieces that reference that input will be rewritten
	* to read from a newly allocated temporary. */
	if (wpos != ATTR_UNUSED) {
	/* Moving the input to some other reg is not really necessary. */
	rc_transform_fragment_wpos(&compiler.Base, wpos, wpos, TRUE);
	}

	/* Invoke the compiler */
	r3xx_compile_fragment_program(&compiler);

	/* Shaders with zero instructions are invalid,
	* use the dummy shader instead. */
	if (shader->code.code.r500.inst_end == -1) {
	rc_destroy(&compiler.Base);
	r300_dummy_fragment_shader(r300, shader);
	return;
	}

	if (compiler.Base.Error) {
	fprintf(stderr, "r300 FP: Compiler Error:\n%sUsing a dummy shader"
	" instead.\nIf there's an 'unknown opcode' message, please"
	" file a bug report and attach this log.\n", compiler.Base.ErrorMsg);

	if (shader->dummy) {
	fprintf(stderr, "r300 FP: Cannot compile the dummy shader! "
	"Giving up...\n");
	abort();
	}

	rc_destroy(&compiler.Base);
	r300_dummy_fragment_shader(r300, shader);
	return;
	}

	/* Initialize numbers of constants for each type. */
	shader->externals_count = ttr.immediate_offset;
	shader->immediates_count = 0;
	shader->rc_state_count = 0;

	for (i = shader->externals_count; i < shader->code.constants.Count; i++) {
	switch (shader->code.constants.Constants[i].Type) {
	case RC_CONSTANT_IMMEDIATE:
	++shader->immediates_count;
	break;
	case RC_CONSTANT_STATE:
	++shader->rc_state_count;
	break;
	default:
	assert(0);
	}
	}

	/* Setup shader depth output. */
	if (shader->code.writes_depth) {
	shader->fg_depth_src = R300_FG_DEPTH_SRC_SHADER;
	shader->us_out_w = R300_W_FMT_W24 \| R300_W_SRC_US;
	} else {
	shader->fg_depth_src = R300_FG_DEPTH_SRC_SCAN;
	shader->us_out_w = R300_W_FMT_W0 \| R300_W_SRC_US;
	}

	/* And, finally... */
	rc_destroy(&compiler.Base);

	/* Build the command buffer. */
	r300_emit_fs_code_to_buffer(r300, shader);
	}

	boolean r300_pick_fragment_shader(struct r300_context* r300)
	{
	struct r300_fragment_shader* fs = r300_fs(r300);
	struct r300_fragment_program_external_state state = {{{ 0 }}};
	struct r300_fragment_shader_code* ptr;

	get_external_state(r300, &state);

	if (!fs->first) {
	/* Build the fragment shader for the first time. */
	fs->first = fs->shader = CALLOC_STRUCT(r300_fragment_shader_code);

	memcpy(&fs->shader->compare_state, &state,
	sizeof(struct r300_fragment_program_external_state));
	r300_translate_fragment_shader(r300, fs->shader, fs->state.tokens);
	return TRUE;

	} else {
	/* Check if the currently-bound shader has been compiled
	* with the texture-compare state we need. */
	if (memcmp(&fs->shader->compare_state, &state, sizeof(state)) != 0) {
	/* Search for the right shader. */
	ptr = fs->first;
	while (ptr) {
	if (memcmp(&ptr->compare_state, &state, sizeof(state)) == 0) {
	if (fs->shader != ptr) {
	fs->shader = ptr;
	return TRUE;
	}
	/* The currently-bound one is OK. */
	return FALSE;
	}
	ptr = ptr->next;
	}

	/* Not found, gotta compile a new one. */
	ptr = CALLOC_STRUCT(r300_fragment_shader_code);
	ptr->next = fs->first;
	fs->first = fs->shader = ptr;

	ptr->compare_state = state;
	r300_translate_fragment_shader(r300, ptr, fs->state.tokens);
	return TRUE;
	}
	}

	return FALSE;
	}