From cdacca4868bbfe2e39f72d524556e7b2c7200ba5 Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Sun, 31 Oct 2010 10:51:59 -0700 Subject: mesa: Move texenvprogram.c to ff_fragment_shader.cpp. This file is about to change to generating a shader program instead of a fragment program. --- src/mesa/main/ff_fragment_shader.cpp | 1623 ++++++++++++++++++++++++++++++++++ 1 file changed, 1623 insertions(+) create mode 100644 src/mesa/main/ff_fragment_shader.cpp (limited to 'src/mesa/main/ff_fragment_shader.cpp') diff --git a/src/mesa/main/ff_fragment_shader.cpp b/src/mesa/main/ff_fragment_shader.cpp new file mode 100644 index 0000000000..9be531735e --- /dev/null +++ b/src/mesa/main/ff_fragment_shader.cpp @@ -0,0 +1,1623 @@ +/************************************************************************** + * + * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. + * All Rights Reserved. + * Copyright 2009 VMware, Inc. 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. + * + **************************************************************************/ + +extern "C" { +#include "glheader.h" +#include "imports.h" +#include "mtypes.h" +#include "program/program.h" +#include "program/prog_parameter.h" +#include "program/prog_cache.h" +#include "program/prog_instruction.h" +#include "program/prog_print.h" +#include "program/prog_statevars.h" +#include "program/programopt.h" +#include "texenvprogram.h" +} + +/* + * Note on texture units: + * + * The number of texture units supported by fixed-function fragment + * processing is MAX_TEXTURE_COORD_UNITS, not MAX_TEXTURE_IMAGE_UNITS. + * That's because there's a one-to-one correspondence between texture + * coordinates and samplers in fixed-function processing. + * + * Since fixed-function vertex processing is limited to MAX_TEXTURE_COORD_UNITS + * sets of texcoords, so is fixed-function fragment processing. + * + * We can safely use ctx->Const.MaxTextureUnits for loop bounds. + */ + + +struct texenvprog_cache_item +{ + GLuint hash; + void *key; + struct gl_fragment_program *data; + struct texenvprog_cache_item *next; +}; + +static GLboolean +texenv_doing_secondary_color(struct gl_context *ctx) +{ + if (ctx->Light.Enabled && + (ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) + return GL_TRUE; + + if (ctx->Fog.ColorSumEnabled) + return GL_TRUE; + + return GL_FALSE; +} + +/** + * Up to nine instructions per tex unit, plus fog, specular color. + */ +#define MAX_INSTRUCTIONS ((MAX_TEXTURE_COORD_UNITS * 9) + 12) + +#define DISASSEM (MESA_VERBOSE & VERBOSE_DISASSEM) + +struct mode_opt { +#ifdef __GNUC__ + __extension__ GLubyte Source:4; /**< SRC_x */ + __extension__ GLubyte Operand:3; /**< OPR_x */ +#else + GLubyte Source; /**< SRC_x */ + GLubyte Operand; /**< OPR_x */ +#endif +}; + +struct state_key { + GLuint nr_enabled_units:8; + GLuint enabled_units:8; + GLuint separate_specular:1; + GLuint fog_enabled:1; + GLuint fog_mode:2; /**< FOG_x */ + GLuint inputs_available:12; + GLuint num_draw_buffers:4; + + /* NOTE: This array of structs must be last! (see "keySize" below) */ + struct { + GLuint enabled:1; + GLuint source_index:3; /**< TEXTURE_x_INDEX */ + GLuint shadow:1; + GLuint ScaleShiftRGB:2; + GLuint ScaleShiftA:2; + + GLuint NumArgsRGB:3; /**< up to MAX_COMBINER_TERMS */ + GLuint ModeRGB:5; /**< MODE_x */ + + GLuint NumArgsA:3; /**< up to MAX_COMBINER_TERMS */ + GLuint ModeA:5; /**< MODE_x */ + + GLuint texture_cyl_wrap:1; /**< For gallium test/debug only */ + + struct mode_opt OptRGB[MAX_COMBINER_TERMS]; + struct mode_opt OptA[MAX_COMBINER_TERMS]; + } unit[MAX_TEXTURE_UNITS]; +}; + +#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: + assert(0); + 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_ZERO 12 +#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; + case GL_ZERO: + return SRC_ZERO; + default: + assert(0); + return SRC_UNKNOWN; + } +} + +#define MODE_REPLACE 0 /* r = a0 */ +#define MODE_MODULATE 1 /* r = a0 * a1 */ +#define MODE_ADD 2 /* r = a0 + a1 */ +#define MODE_ADD_SIGNED 3 /* r = a0 + a1 - 0.5 */ +#define MODE_INTERPOLATE 4 /* r = a0 * a2 + a1 * (1 - a2) */ +#define MODE_SUBTRACT 5 /* r = a0 - a1 */ +#define MODE_DOT3_RGB 6 /* r = a0 . a1 */ +#define MODE_DOT3_RGB_EXT 7 /* r = a0 . a1 */ +#define MODE_DOT3_RGBA 8 /* r = a0 . a1 */ +#define MODE_DOT3_RGBA_EXT 9 /* r = a0 . a1 */ +#define MODE_MODULATE_ADD_ATI 10 /* r = a0 * a2 + a1 */ +#define MODE_MODULATE_SIGNED_ADD_ATI 11 /* r = a0 * a2 + a1 - 0.5 */ +#define MODE_MODULATE_SUBTRACT_ATI 12 /* r = a0 * a2 - a1 */ +#define MODE_ADD_PRODUCTS 13 /* r = a0 * a1 + a2 * a3 */ +#define MODE_ADD_PRODUCTS_SIGNED 14 /* r = a0 * a1 + a2 * a3 - 0.5 */ +#define MODE_BUMP_ENVMAP_ATI 15 /* special */ +#define MODE_UNKNOWN 16 + +/** + * Translate GL combiner state into a MODE_x value + */ +static GLuint translate_mode( GLenum envMode, GLenum mode ) +{ + switch (mode) { + case GL_REPLACE: return MODE_REPLACE; + case GL_MODULATE: return MODE_MODULATE; + case GL_ADD: + if (envMode == GL_COMBINE4_NV) + return MODE_ADD_PRODUCTS; + else + return MODE_ADD; + case GL_ADD_SIGNED: + if (envMode == GL_COMBINE4_NV) + return MODE_ADD_PRODUCTS_SIGNED; + else + 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; + case GL_BUMP_ENVMAP_ATI: return MODE_BUMP_ENVMAP_ATI; + default: + assert(0); + return MODE_UNKNOWN; + } +} + + +/** + * Do we need to clamp the results of the given texture env/combine mode? + * If the inputs to the mode are in [0,1] we don't always have to clamp + * the results. + */ +static GLboolean +need_saturate( GLuint mode ) +{ + switch (mode) { + case MODE_REPLACE: + case MODE_MODULATE: + case MODE_INTERPOLATE: + return GL_FALSE; + case MODE_ADD: + case MODE_ADD_SIGNED: + case MODE_SUBTRACT: + case MODE_DOT3_RGB: + case MODE_DOT3_RGB_EXT: + case MODE_DOT3_RGBA: + case MODE_DOT3_RGBA_EXT: + case MODE_MODULATE_ADD_ATI: + case MODE_MODULATE_SIGNED_ADD_ATI: + case MODE_MODULATE_SUBTRACT_ATI: + case MODE_ADD_PRODUCTS: + case MODE_ADD_PRODUCTS_SIGNED: + case MODE_BUMP_ENVMAP_ATI: + return GL_TRUE; + default: + assert(0); + return GL_FALSE; + } +} + + + +/** + * Translate TEXTURE_x_BIT to TEXTURE_x_INDEX. + */ +static GLuint translate_tex_src_bit( GLbitfield bit ) +{ + ASSERT(bit); + return _mesa_ffs(bit) - 1; +} + + +#define VERT_BIT_TEX_ANY (0xff << VERT_ATTRIB_TEX0) +#define VERT_RESULT_TEX_ANY (0xff << VERT_RESULT_TEX0) + +/** + * Identify all possible varying inputs. The fragment program will + * never reference non-varying inputs, but will track them via state + * constants instead. + * + * This function figures out all the inputs that the fragment program + * has access to. The bitmask is later reduced to just those which + * are actually referenced. + */ +static GLbitfield get_fp_input_mask( struct gl_context *ctx ) +{ + /* _NEW_PROGRAM */ + const GLboolean vertexShader = + (ctx->Shader.CurrentVertexProgram && + ctx->Shader.CurrentVertexProgram->LinkStatus && + ctx->Shader.CurrentVertexProgram->VertexProgram); + const GLboolean vertexProgram = ctx->VertexProgram._Enabled; + GLbitfield fp_inputs = 0x0; + + if (ctx->VertexProgram._Overriden) { + /* Somebody's messing with the vertex program and we don't have + * a clue what's happening. Assume that it could be producing + * all possible outputs. + */ + fp_inputs = ~0; + } + else if (ctx->RenderMode == GL_FEEDBACK) { + /* _NEW_RENDERMODE */ + fp_inputs = (FRAG_BIT_COL0 | FRAG_BIT_TEX0); + } + else if (!(vertexProgram || vertexShader) || + !ctx->VertexProgram._Current) { + /* Fixed function vertex logic */ + /* _NEW_ARRAY */ + GLbitfield varying_inputs = ctx->varying_vp_inputs; + + /* These get generated in the setup routine regardless of the + * vertex program: + */ + /* _NEW_POINT */ + if (ctx->Point.PointSprite) + varying_inputs |= FRAG_BITS_TEX_ANY; + + /* First look at what values may be computed by the generated + * vertex program: + */ + /* _NEW_LIGHT */ + if (ctx->Light.Enabled) { + fp_inputs |= FRAG_BIT_COL0; + + if (texenv_doing_secondary_color(ctx)) + fp_inputs |= FRAG_BIT_COL1; + } + + /* _NEW_TEXTURE */ + fp_inputs |= (ctx->Texture._TexGenEnabled | + ctx->Texture._TexMatEnabled) << FRAG_ATTRIB_TEX0; + + /* Then look at what might be varying as a result of enabled + * arrays, etc: + */ + if (varying_inputs & VERT_BIT_COLOR0) + fp_inputs |= FRAG_BIT_COL0; + if (varying_inputs & VERT_BIT_COLOR1) + fp_inputs |= FRAG_BIT_COL1; + + fp_inputs |= (((varying_inputs & VERT_BIT_TEX_ANY) >> VERT_ATTRIB_TEX0) + << FRAG_ATTRIB_TEX0); + + } + else { + /* calculate from vp->outputs */ + struct gl_vertex_program *vprog; + GLbitfield64 vp_outputs; + + /* Choose GLSL vertex shader over ARB vertex program. Need this + * since vertex shader state validation comes after fragment state + * validation (see additional comments in state.c). + */ + if (vertexShader) + vprog = ctx->Shader.CurrentVertexProgram->VertexProgram; + else + vprog = ctx->VertexProgram.Current; + + vp_outputs = vprog->Base.OutputsWritten; + + /* These get generated in the setup routine regardless of the + * vertex program: + */ + /* _NEW_POINT */ + if (ctx->Point.PointSprite) + vp_outputs |= FRAG_BITS_TEX_ANY; + + if (vp_outputs & (1 << VERT_RESULT_COL0)) + fp_inputs |= FRAG_BIT_COL0; + if (vp_outputs & (1 << VERT_RESULT_COL1)) + fp_inputs |= FRAG_BIT_COL1; + + fp_inputs |= (((vp_outputs & VERT_RESULT_TEX_ANY) >> VERT_RESULT_TEX0) + << FRAG_ATTRIB_TEX0); + } + + return fp_inputs; +} + + +/** + * Examine current texture environment state and generate a unique + * key to identify it. + */ +static GLuint make_state_key( struct gl_context *ctx, struct state_key *key ) +{ + GLuint i, j; + GLbitfield inputs_referenced = FRAG_BIT_COL0; + const GLbitfield inputs_available = get_fp_input_mask( ctx ); + GLuint keySize; + + memset(key, 0, sizeof(*key)); + + /* _NEW_TEXTURE */ + for (i = 0; i < ctx->Const.MaxTextureUnits; i++) { + const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[i]; + const struct gl_texture_object *texObj = texUnit->_Current; + const struct gl_tex_env_combine_state *comb = texUnit->_CurrentCombine; + GLenum format; + + if (!texUnit->_ReallyEnabled || !texUnit->Enabled) + continue; + + format = texObj->Image[0][texObj->BaseLevel]->_BaseFormat; + + key->unit[i].enabled = 1; + key->enabled_units |= (1<nr_enabled_units = i + 1; + inputs_referenced |= FRAG_BIT_TEX(i); + + key->unit[i].source_index = + translate_tex_src_bit(texUnit->_ReallyEnabled); + + key->unit[i].shadow = ((texObj->CompareMode == GL_COMPARE_R_TO_TEXTURE) && + ((format == GL_DEPTH_COMPONENT) || + (format == GL_DEPTH_STENCIL_EXT))); + + key->unit[i].NumArgsRGB = comb->_NumArgsRGB; + key->unit[i].NumArgsA = comb->_NumArgsA; + + key->unit[i].ModeRGB = + translate_mode(texUnit->EnvMode, comb->ModeRGB); + key->unit[i].ModeA = + translate_mode(texUnit->EnvMode, comb->ModeA); + + key->unit[i].ScaleShiftRGB = comb->ScaleShiftRGB; + key->unit[i].ScaleShiftA = comb->ScaleShiftA; + + for (j = 0; j < MAX_COMBINER_TERMS; j++) { + key->unit[i].OptRGB[j].Operand = translate_operand(comb->OperandRGB[j]); + key->unit[i].OptA[j].Operand = translate_operand(comb->OperandA[j]); + key->unit[i].OptRGB[j].Source = translate_source(comb->SourceRGB[j]); + key->unit[i].OptA[j].Source = translate_source(comb->SourceA[j]); + } + + if (key->unit[i].ModeRGB == MODE_BUMP_ENVMAP_ATI) { + /* requires some special translation */ + key->unit[i].NumArgsRGB = 2; + key->unit[i].ScaleShiftRGB = 0; + key->unit[i].OptRGB[0].Operand = OPR_SRC_COLOR; + key->unit[i].OptRGB[0].Source = SRC_TEXTURE; + key->unit[i].OptRGB[1].Operand = OPR_SRC_COLOR; + key->unit[i].OptRGB[1].Source = texUnit->BumpTarget - GL_TEXTURE0 + SRC_TEXTURE0; + } + + /* this is a back-door for enabling cylindrical texture wrap mode */ + if (texObj->Priority == 0.125) + key->unit[i].texture_cyl_wrap = 1; + } + + /* _NEW_LIGHT | _NEW_FOG */ + if (texenv_doing_secondary_color(ctx)) { + key->separate_specular = 1; + inputs_referenced |= FRAG_BIT_COL1; + } + + /* _NEW_FOG */ + if (ctx->Fog.Enabled) { + key->fog_enabled = 1; + key->fog_mode = translate_fog_mode(ctx->Fog.Mode); + inputs_referenced |= FRAG_BIT_FOGC; /* maybe */ + } + + /* _NEW_BUFFERS */ + key->num_draw_buffers = ctx->DrawBuffer->_NumColorDrawBuffers; + + key->inputs_available = (inputs_available & inputs_referenced); + + /* compute size of state key, ignoring unused texture units */ + keySize = sizeof(*key) - sizeof(key->unit) + + key->nr_enabled_units * sizeof(key->unit[0]); + + return keySize; +} + + +/** + * 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 swz:12; + GLuint pad:7; +}; + +static const struct ureg undef = { + PROGRAM_UNDEFINED, + 255, + 0, + 0, + 0 +}; + + +/** State used to build the fragment program: + */ +struct texenv_fragment_program { + struct gl_fragment_program *program; + struct state_key *state; + + GLbitfield alu_temps; /**< Track texture indirections, see spec. */ + GLbitfield temps_output; /**< Track texture indirections, see spec. */ + GLbitfield temp_in_use; /**< Tracks temporary regs which are in use. */ + GLboolean error; + + struct ureg src_texture[MAX_TEXTURE_COORD_UNITS]; + /* Reg containing each texture unit's sampled texture color, + * else undef. + */ + + struct ureg texcoord_tex[MAX_TEXTURE_COORD_UNITS]; + /* Reg containing texcoord for a texture unit, + * needed for bump mapping, 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.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 == PROGRAM_UNDEFINED; +} + + +static struct ureg get_temp( struct texenv_fragment_program *p ) +{ + GLint bit; + + /* First try and reuse temps which have been used already: + */ + bit = _mesa_ffs( ~p->temp_in_use & p->alu_temps ); + + /* Then any unused temporary: + */ + if (!bit) + bit = _mesa_ffs( ~p->temp_in_use ); + + if (!bit) { + _mesa_problem(NULL, "%s: out of temporaries\n", __FILE__); + exit(1); + } + + if ((GLuint) bit > p->program->Base.NumTemporaries) + p->program->Base.NumTemporaries = bit; + + 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 available 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 = _mesa_ffs( ~p->temp_in_use & ~p->alu_temps & ~p->temps_output ); + + /* Then any unused temporary: + */ + if (!bit) + bit = _mesa_ffs( ~p->temp_in_use ); + + if (!bit) { + _mesa_problem(NULL, "%s: out of temporaries\n", __FILE__); + exit(1); + } + + if ((GLuint) bit > p->program->Base.NumTemporaries) + p->program->Base.NumTemporaries = bit; + + p->temp_in_use |= 1<<(bit-1); + return make_ureg(PROGRAM_TEMPORARY, (bit-1)); +} + + +/** Mark a temp reg as being no longer allocatable. */ +static void reserve_temp( struct texenv_fragment_program *p, struct ureg r ) +{ + if (r.file == PROGRAM_TEMPORARY) + p->temps_output |= (1 << r.idx); +} + + +static void release_temps(struct gl_context *ctx, struct texenv_fragment_program *p ) +{ + GLuint max_temp = ctx->Const.FragmentProgram.MaxTemps; + + /* 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<temps_output; +} + + +static struct ureg register_param5( struct texenv_fragment_program *p, + GLint s0, + GLint s1, + GLint s2, + GLint s3, + GLint s4) +{ + int tokens[STATE_LENGTH]; + GLuint idx; + tokens[0] = s0; + tokens[1] = s1; + tokens[2] = s2; + tokens[3] = s3; + tokens[4] = s4; + idx = _mesa_add_state_reference(p->program->Base.Parameters, + (gl_state_index *)tokens); + return make_ureg(PROGRAM_STATE_VAR, idx); +} + + +#define register_param1(p,s0) register_param5(p,s0,0,0,0,0) +#define register_param2(p,s0,s1) register_param5(p,s0,s1,0,0,0) +#define register_param3(p,s0,s1,s2) register_param5(p,s0,s1,s2,0,0) +#define register_param4(p,s0,s1,s2,s3) register_param5(p,s0,s1,s2,s3,0) + +static GLuint frag_to_vert_attrib( GLuint attrib ) +{ + switch (attrib) { + case FRAG_ATTRIB_COL0: return VERT_ATTRIB_COLOR0; + case FRAG_ATTRIB_COL1: return VERT_ATTRIB_COLOR1; + default: + assert(attrib >= FRAG_ATTRIB_TEX0); + assert(attrib <= FRAG_ATTRIB_TEX7); + return attrib - FRAG_ATTRIB_TEX0 + VERT_ATTRIB_TEX0; + } +} + + +static struct ureg register_input( struct texenv_fragment_program *p, GLuint input ) +{ + if (p->state->inputs_available & (1<program->Base.InputsRead |= (1 << input); + return make_ureg(PROGRAM_INPUT, input); + } + else { + GLuint idx = frag_to_vert_attrib( input ); + return register_param3( p, STATE_INTERNAL, STATE_CURRENT_ATTRIB, idx ); + } +} + + +static void emit_arg( struct prog_src_register *reg, + struct ureg ureg ) +{ + reg->File = ureg.file; + reg->Index = ureg.idx; + reg->Swizzle = ureg.swz; + reg->Negate = ureg.negatebase ? NEGATE_XYZW : NEGATE_NONE; + reg->Abs = GL_FALSE; +} + +static void emit_dst( struct prog_dst_register *dst, + struct ureg ureg, GLuint mask ) +{ + dst->File = ureg.file; + dst->Index = ureg.idx; + dst->WriteMask = mask; + dst->CondMask = COND_TR; /* always pass cond test */ + dst->CondSwizzle = SWIZZLE_NOOP; +} + +static struct prog_instruction * +emit_op(struct texenv_fragment_program *p, + enum prog_opcode op, + struct ureg dest, + GLuint mask, + GLboolean saturate, + struct ureg src0, + struct ureg src1, + struct ureg src2 ) +{ + const GLuint nr = p->program->Base.NumInstructions++; + struct prog_instruction *inst = &p->program->Base.Instructions[nr]; + + assert(nr < MAX_INSTRUCTIONS); + + _mesa_init_instructions(inst, 1); + inst->Opcode = op; + + emit_arg( &inst->SrcReg[0], src0 ); + emit_arg( &inst->SrcReg[1], src1 ); + emit_arg( &inst->SrcReg[2], src2 ); + + inst->SaturateMode = saturate ? SATURATE_ZERO_ONE : SATURATE_OFF; + + emit_dst( &inst->DstReg, dest, mask ); + +#if 0 + /* Accounting for indirection tracking: + */ + if (dest.file == PROGRAM_TEMPORARY) + p->temps_output |= 1 << dest.idx; +#endif + + return inst; +} + + +static struct ureg emit_arith( struct texenv_fragment_program *p, + enum prog_opcode op, + struct ureg dest, + GLuint mask, + GLboolean 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->Base.NumAluInstructions++; + return dest; +} + +static struct ureg emit_texld( struct texenv_fragment_program *p, + enum prog_opcode op, + struct ureg dest, + GLuint destmask, + GLuint tex_unit, + GLuint tex_idx, + GLuint tex_shadow, + struct ureg coord ) +{ + struct prog_instruction *inst = emit_op( p, op, + dest, destmask, + GL_FALSE, /* don't saturate? */ + coord, /* arg 0? */ + undef, + undef); + + inst->TexSrcTarget = tex_idx; + inst->TexSrcUnit = tex_unit; + inst->TexShadow = tex_shadow; + + p->program->Base.NumTexInstructions++; + + /* Accounting for indirection tracking: + */ + reserve_temp(p, dest); + +#if 0 + /* Is this a texture indirection? + */ + if ((coord.file == PROGRAM_TEMPORARY && + (p->temps_output & (1<alu_temps & (1<program->Base.NumTexIndirections++; + p->temps_output = 1<alu_temps = 0; + assert(0); /* KW: texture env crossbar */ + } +#endif + + 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, swizzle; + struct ureg r; + values[0] = s0; + values[1] = s1; + values[2] = s2; + values[3] = s3; + idx = _mesa_add_unnamed_constant( p->program->Base.Parameters, values, 4, + &swizzle ); + r = make_ureg(PROGRAM_CONSTANT, idx); + r.swz = swizzle; + return r; +} + +#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->half = 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->zero = register_scalar_const(p, 0.0); + return p->zero; +} + + +static void program_error( struct texenv_fragment_program *p, const char *msg ) +{ + _mesa_problem(NULL, "%s", 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_ZERO: + return get_zero(p); + + case SRC_PREVIOUS: + if (is_undef(p->src_previous)) + return register_input(p, FRAG_ATTRIB_COL0); + else + return p->src_previous; + + default: + assert(0); + return undef; + } +} + +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, OPCODE_SUB, arg, mask, 0, one, src, undef); + + case OPR_SRC_ALPHA: + if (mask == WRITEMASK_W) + return src; + else + return swizzle1( src, SWIZZLE_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, OPCODE_SUB, arg, mask, 0, + one, swizzle1(src, SWIZZLE_W), undef); + case OPR_ZERO: + return get_zero(p); + case OPR_ONE: + return get_one(p); + case OPR_SRC_COLOR: + return src; + default: + assert(0); + return src; + } +} + +/** + * Check if the RGB and Alpha sources and operands match for the given + * texture unit's combinder state. When the RGB and A sources and + * operands match, we can emit fewer instructions. + */ +static GLboolean args_match( const struct state_key *key, GLuint unit ) +{ + GLuint i, numArgs = key->unit[unit].NumArgsRGB; + + for (i = 0; i < numArgs; 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, + GLboolean saturate, + GLuint unit, + GLuint nr, + GLuint mode, + const struct mode_opt *opt) +{ + struct ureg src[MAX_COMBINER_TERMS]; + struct ureg tmp, half; + GLuint i; + + assert(nr <= MAX_COMBINER_TERMS); + + 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, OPCODE_MOV, dest, mask, saturate, src[0], undef, undef ); + case MODE_MODULATE: + return emit_arith( p, OPCODE_MUL, dest, mask, saturate, + src[0], src[1], undef ); + case MODE_ADD: + return emit_arith( p, OPCODE_ADD, dest, mask, saturate, + src[0], src[1], undef ); + case MODE_ADD_SIGNED: + /* tmp = arg0 + arg1 + * result = tmp - .5 + */ + half = get_half(p); + tmp = get_temp( p ); + emit_arith( p, OPCODE_ADD, tmp, mask, 0, src[0], src[1], undef ); + emit_arith( p, 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, OPCODE_LRP, dest, mask, saturate, src[2], src[0], src[1] ); + + case MODE_SUBTRACT: + return emit_arith( p, 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, 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, OPCODE_MAD, tmp1, WRITEMASK_XYZW, 0, + two, src[1], neg1); + emit_arith( p, OPCODE_DP3, dest, mask, saturate, tmp0, tmp1, undef); + return dest; + } + case MODE_MODULATE_ADD_ATI: + /* Arg0 * Arg2 + Arg1 */ + return emit_arith( p, 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, OPCODE_MAD, tmp0, mask, 0, src[0], src[2], src[1] ); + emit_arith( p, OPCODE_SUB, dest, mask, saturate, tmp0, half, undef ); + return dest; + } + case MODE_MODULATE_SUBTRACT_ATI: + /* Arg0 * Arg2 - Arg1 */ + emit_arith( p, OPCODE_MAD, dest, mask, 0, src[0], src[2], negate(src[1]) ); + return dest; + case MODE_ADD_PRODUCTS: + /* Arg0 * Arg1 + Arg2 * Arg3 */ + { + struct ureg tmp0 = get_temp(p); + emit_arith( p, OPCODE_MUL, tmp0, mask, 0, src[0], src[1], undef ); + emit_arith( p, OPCODE_MAD, dest, mask, saturate, src[2], src[3], tmp0 ); + } + return dest; + case MODE_ADD_PRODUCTS_SIGNED: + /* Arg0 * Arg1 + Arg2 * Arg3 - 0.5 */ + { + struct ureg tmp0 = get_temp(p); + half = get_half(p); + emit_arith( p, OPCODE_MUL, tmp0, mask, 0, src[0], src[1], undef ); + emit_arith( p, OPCODE_MAD, tmp0, mask, 0, src[2], src[3], tmp0 ); + emit_arith( p, OPCODE_SUB, dest, mask, saturate, tmp0, half, undef ); + } + return dest; + case MODE_BUMP_ENVMAP_ATI: + /* special - not handled here */ + assert(0); + return src[0]; + default: + assert(0); + return src[0]; + } +} + + +/** + * Generate instructions for one texture unit's env/combiner mode. + */ +static struct ureg +emit_texenv(struct texenv_fragment_program *p, GLuint unit) +{ + const struct state_key *key = p->state; + GLboolean rgb_saturate, alpha_saturate; + GLuint rgb_shift, alpha_shift; + struct ureg out, dest; + + if (!key->unit[unit].enabled) { + return get_source(p, SRC_PREVIOUS, 0); + } + if (key->unit[unit].ModeRGB == MODE_BUMP_ENVMAP_ATI) { + /* this isn't really a env stage delivering a color and handled elsewhere */ + 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 we'll do rgb/alpha shifting don't saturate in emit_combine(). + * We don't want to clamp twice. + */ + if (rgb_shift) + rgb_saturate = GL_FALSE; /* saturate after rgb shift */ + else if (need_saturate(key->unit[unit].ModeRGB)) + rgb_saturate = GL_TRUE; + else + rgb_saturate = GL_FALSE; + + if (alpha_shift) + alpha_saturate = GL_FALSE; /* saturate after alpha shift */ + else if (need_saturate(key->unit[unit].ModeA)) + alpha_saturate = GL_TRUE; + else + alpha_saturate = GL_FALSE; + + /* If this is the very last calculation (and various other conditions + * are met), emit directly to the color output register. Otherwise, + * emit to a temporary register. + */ + if (key->separate_specular || + unit != p->last_tex_stage || + alpha_shift || + key->num_draw_buffers != 1 || + rgb_shift) + dest = get_temp( p ); + else + dest = make_ureg(PROGRAM_OUTPUT, FRAG_RESULT_COLOR); + + /* 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, rgb_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].ModeRGB == MODE_DOT3_RGBA) { + out = emit_combine( p, dest, WRITEMASK_XYZW, rgb_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, rgb_saturate, + unit, + key->unit[unit].NumArgsRGB, + key->unit[unit].ModeRGB, + key->unit[unit].OptRGB); + out = emit_combine( p, dest, WRITEMASK_W, alpha_saturate, + unit, + key->unit[unit].NumArgsA, + key->unit[unit].ModeA, + key->unit[unit].OptA); + } + + /* Deal with the final shift: + */ + if (alpha_shift || rgb_shift) { + struct ureg shift; + GLboolean saturate = GL_TRUE; /* always saturate at this point */ + + if (rgb_shift == alpha_shift) { + shift = register_scalar_const(p, (GLfloat)(1<src_texture[unit])) { + const GLuint texTarget = p->state->unit[unit].source_index; + struct ureg texcoord; + struct ureg tmp = get_tex_temp( p ); + + if (is_undef(p->texcoord_tex[unit])) { + texcoord = register_input(p, FRAG_ATTRIB_TEX0+unit); + } + else { + /* might want to reuse this reg for tex output actually */ + texcoord = p->texcoord_tex[unit]; + } + + /* TODO: Use D0_MASK_XY where possible. + */ + if (p->state->unit[unit].enabled) { + GLboolean shadow = GL_FALSE; + + if (p->state->unit[unit].shadow) { + p->program->Base.ShadowSamplers |= 1 << unit; + shadow = GL_TRUE; + } + + p->src_texture[unit] = emit_texld( p, OPCODE_TXP, + tmp, WRITEMASK_XYZW, + unit, texTarget, shadow, + texcoord ); + + p->program->Base.SamplersUsed |= (1 << unit); + /* This identity mapping should already be in place + * (see _mesa_init_program_struct()) but let's be safe. + */ + p->program->Base.SamplerUnits[unit] = unit; + } + else + p->src_texture[unit] = get_zero(p); + + if (p->state->unit[unit].texture_cyl_wrap) { + /* set flag which is checked by Mesa->Gallium program translation */ + p->program->Base.InputFlags[0] |= PROG_PARAM_BIT_CYL_WRAP; + } + + } +} + +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: + load_texture(p, src - SRC_TEXTURE0); + break; + + default: + /* not a texture src - do nothing */ + break; + } + + return GL_TRUE; +} + + +/** + * Generate instructions for loading all texture source terms. + */ +static GLboolean +load_texunit_sources( struct texenv_fragment_program *p, GLuint unit ) +{ + const struct state_key *key = p->state; + GLuint i; + + for (i = 0; i < key->unit[unit].NumArgsRGB; i++) { + load_texenv_source( p, key->unit[unit].OptRGB[i].Source, unit ); + } + + for (i = 0; i < key->unit[unit].NumArgsA; i++) { + load_texenv_source( p, key->unit[unit].OptA[i].Source, unit ); + } + + return GL_TRUE; +} + +/** + * Generate instructions for loading bump map textures. + */ +static GLboolean +load_texunit_bumpmap( struct texenv_fragment_program *p, GLuint unit ) +{ + const struct state_key *key = p->state; + GLuint bumpedUnitNr = key->unit[unit].OptRGB[1].Source - SRC_TEXTURE0; + struct ureg texcDst, bumpMapRes; + struct ureg constdudvcolor = register_const4f(p, 0.0, 0.0, 0.0, 1.0); + struct ureg texcSrc = register_input(p, FRAG_ATTRIB_TEX0 + bumpedUnitNr); + struct ureg rotMat0 = register_param3( p, STATE_INTERNAL, STATE_ROT_MATRIX_0, unit ); + struct ureg rotMat1 = register_param3( p, STATE_INTERNAL, STATE_ROT_MATRIX_1, unit ); + + load_texenv_source( p, unit + SRC_TEXTURE0, unit ); + + bumpMapRes = get_source(p, key->unit[unit].OptRGB[0].Source, unit); + texcDst = get_tex_temp( p ); + p->texcoord_tex[bumpedUnitNr] = texcDst; + + /* Apply rot matrix and add coords to be available in next phase. + * dest = (Arg0.xxxx * rotMat0 + Arg1) + (Arg0.yyyy * rotMat1) + * note only 2 coords are affected the rest are left unchanged (mul by 0) + */ + emit_arith( p, OPCODE_MAD, texcDst, WRITEMASK_XYZW, 0, + swizzle1(bumpMapRes, SWIZZLE_X), rotMat0, texcSrc ); + emit_arith( p, OPCODE_MAD, texcDst, WRITEMASK_XYZW, 0, + swizzle1(bumpMapRes, SWIZZLE_Y), rotMat1, texcDst ); + + /* Move 0,0,0,1 into bumpmap src if someone (crossbar) is foolish + * enough to access this later, should optimize away. + */ + emit_arith( p, OPCODE_MOV, bumpMapRes, WRITEMASK_XYZW, 0, + constdudvcolor, undef, undef ); + + return GL_TRUE; +} + +/** + * Generate a new fragment program which implements the context's + * current texture env/combine mode. + */ +static void +create_new_program(struct gl_context *ctx, struct state_key *key, + struct gl_fragment_program *program) +{ + struct prog_instruction instBuffer[MAX_INSTRUCTIONS]; + struct texenv_fragment_program p; + GLuint unit; + struct ureg cf, out; + int i; + + memset(&p, 0, sizeof(p)); + p.state = key; + p.program = program; + + /* During code generation, use locally-allocated instruction buffer, + * then alloc dynamic storage below. + */ + p.program->Base.Instructions = instBuffer; + p.program->Base.Target = GL_FRAGMENT_PROGRAM_ARB; + p.program->Base.String = NULL; + p.program->Base.NumTexIndirections = 1; /* is this right? */ + p.program->Base.NumTexInstructions = 0; + p.program->Base.NumAluInstructions = 0; + p.program->Base.NumInstructions = 0; + p.program->Base.NumTemporaries = 0; + p.program->Base.NumParameters = 0; + p.program->Base.NumAttributes = 0; + p.program->Base.NumAddressRegs = 0; + p.program->Base.Parameters = _mesa_new_parameter_list(); + p.program->Base.InputsRead = 0x0; + + if (key->num_draw_buffers == 1) + p.program->Base.OutputsWritten = 1 << FRAG_RESULT_COLOR; + else { + for (i = 0; i < key->num_draw_buffers; i++) + p.program->Base.OutputsWritten |= (1 << (FRAG_RESULT_DATA0 + i)); + } + + for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { + p.src_texture[unit] = undef; + p.texcoord_tex[unit] = undef; + } + + p.src_previous = undef; + p.half = undef; + p.zero = undef; + p.one = undef; + + p.last_tex_stage = 0; + release_temps(ctx, &p); + + if (key->enabled_units && key->num_draw_buffers) { + GLboolean needbumpstage = GL_FALSE; + + /* Zeroth pass - bump map textures first */ + for (unit = 0; unit < key->nr_enabled_units; unit++) + if (key->unit[unit].enabled && + key->unit[unit].ModeRGB == MODE_BUMP_ENVMAP_ATI) { + needbumpstage = GL_TRUE; + load_texunit_bumpmap( &p, unit ); + } + if (needbumpstage) + p.program->Base.NumTexIndirections++; + + /* First pass - to support texture_env_crossbar, first identify + * all referenced texture sources and emit texld instructions + * for each: + */ + for (unit = 0; unit < key->nr_enabled_units; unit++) + if (key->unit[unit].enabled) { + load_texunit_sources( &p, unit ); + p.last_tex_stage = unit; + } + + /* Second pass - emit combine instructions to build final color: + */ + for (unit = 0; unit < key->nr_enabled_units; unit++) + if (key->unit[unit].enabled) { + p.src_previous = emit_texenv( &p, unit ); + reserve_temp(&p, p.src_previous); /* don't re-use this temp reg */ + release_temps(ctx, &p); /* release all temps */ + } + } + + cf = get_source( &p, SRC_PREVIOUS, 0 ); + + for (i = 0; i < key->num_draw_buffers; i++) { + if (key->num_draw_buffers == 1) + out = make_ureg( PROGRAM_OUTPUT, FRAG_RESULT_COLOR ); + else { + out = make_ureg( PROGRAM_OUTPUT, FRAG_RESULT_DATA0 + i ); + } + + if (key->separate_specular) { + /* Emit specular add. + */ + struct ureg s = register_input(&p, FRAG_ATTRIB_COL1); + emit_arith( &p, OPCODE_ADD, out, WRITEMASK_XYZ, 0, cf, s, undef ); + emit_arith( &p, OPCODE_MOV, out, WRITEMASK_W, 0, cf, undef, 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, OPCODE_MOV, out, WRITEMASK_XYZW, 0, cf, undef, undef ); + } + } + /* Finish up: + */ + emit_arith( &p, OPCODE_END, undef, WRITEMASK_XYZW, 0, undef, undef, undef); + + if (key->fog_enabled) { + /* Pull fog mode from struct gl_context, the value in the state key is + * a reduced value and not what is expected in FogOption + */ + p.program->FogOption = ctx->Fog.Mode; + p.program->Base.InputsRead |= FRAG_BIT_FOGC; + } + else { + p.program->FogOption = GL_NONE; + } + + if (p.program->Base.NumTexIndirections > ctx->Const.FragmentProgram.MaxTexIndirections) + program_error(&p, "Exceeded max nr indirect texture lookups"); + + if (p.program->Base.NumTexInstructions > ctx->Const.FragmentProgram.MaxTexInstructions) + program_error(&p, "Exceeded max TEX instructions"); + + if (p.program->Base.NumAluInstructions > ctx->Const.FragmentProgram.MaxAluInstructions) + program_error(&p, "Exceeded max ALU instructions"); + + ASSERT(p.program->Base.NumInstructions <= MAX_INSTRUCTIONS); + + /* Allocate final instruction array */ + p.program->Base.Instructions + = _mesa_alloc_instructions(p.program->Base.NumInstructions); + if (!p.program->Base.Instructions) { + _mesa_error(ctx, GL_OUT_OF_MEMORY, + "generating tex env program"); + return; + } + _mesa_copy_instructions(p.program->Base.Instructions, instBuffer, + p.program->Base.NumInstructions); + + if (key->num_draw_buffers && p.program->FogOption) { + _mesa_append_fog_code(ctx, p.program); + p.program->FogOption = GL_NONE; + } + + + /* Notify driver the fragment program has (actually) changed. + */ + if (ctx->Driver.ProgramStringNotify) { + GLboolean ok = ctx->Driver.ProgramStringNotify(ctx, + GL_FRAGMENT_PROGRAM_ARB, + &p.program->Base); + /* Driver should be able to handle any texenv programs as long as + * the driver correctly reported max number of texture units correctly, + * etc. + */ + ASSERT(ok); + (void) ok; /* silence unused var warning */ + } + + if (DISASSEM) { + _mesa_print_program(&p.program->Base); + printf("\n"); + } +} + +extern "C" { + +/** + * Return a fragment program which implements the current + * fixed-function texture, fog and color-sum operations. + */ +struct gl_fragment_program * +_mesa_get_fixed_func_fragment_program(struct gl_context *ctx) +{ + struct gl_fragment_program *prog; + struct state_key key; + GLuint keySize; + + keySize = make_state_key(ctx, &key); + + prog = (struct gl_fragment_program *) + _mesa_search_program_cache(ctx->FragmentProgram.Cache, + &key, keySize); + + if (!prog) { + prog = (struct gl_fragment_program *) + ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0); + + create_new_program(ctx, &key, prog); + + _mesa_program_cache_insert(ctx, ctx->FragmentProgram.Cache, + &key, keySize, &prog->Base); + } + + return prog; +} + +} -- cgit v1.2.3