src/mesa/drivers/dri/r300/r300_fragprog_common.c

   1 /*
   2  * Copyright (C) 2009 Maciej Cencora <m.cencora@gmail.com>
   3  *
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining
   7  * a copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sublicense, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial
  16  * portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  */
  27
  28 /**
  29  * \file
  30  *
  31  * Fragment program compiler. Perform transformations on the intermediate
  32  * representation until the program is in a form where we can translate
  33  * it more or less directly into machine-readable form.
  34  *
  35  * \author Ben Skeggs <darktama@iinet.net.au>
  36  * \author Jerome Glisse <j.glisse@gmail.com>
  37  */
  38
  39 #include "r300_fragprog_common.h"
  40
  41 #include "shader/program.h"
  42 #include "shader/prog_parameter.h"
  43 #include "shader/prog_print.h"
  44
  45 #include "compiler/radeon_compiler.h"
  46
  47 #include "r300_state.h"
  48
  49
  50 static GLuint build_dtm(GLuint depthmode)
  51 {
  52         switch(depthmode) {
  53         default:
  54         case GL_LUMINANCE: return 0;
  55         case GL_INTENSITY: return 1;
  56         case GL_ALPHA: return 2;
  57         }
  58 }
  59
  60 static GLuint build_func(GLuint comparefunc)
  61 {
  62         return comparefunc - GL_NEVER;
  63 }
  64
  65 /**
  66  * Collect all external state that is relevant for compiling the given
  67  * fragment program.
  68  */
  69 static void build_state(
  70         r300ContextPtr r300,
  71         struct gl_fragment_program *fp,
  72         struct r300_fragment_program_external_state *state)
  73 {
  74         int unit;
  75
  76         _mesa_bzero(state, sizeof(*state));
  77
  78         for(unit = 0; unit < 16; ++unit) {
  79                 if (fp->Base.ShadowSamplers & (1 << unit)) {
  80                         struct gl_texture_object* tex = r300->radeon.glCtx->Texture.Unit[unit]._Current;
  81
  82                         state->unit[unit].depth_texture_mode = build_dtm(tex->DepthMode);
  83                         state->unit[unit].texture_compare_func = build_func(tex->CompareFunc);
  84                 }
  85         }
  86 }
  87
  88
  89 /**
  90  * Transform the program to support fragment.position.
  91  *
  92  * Introduce a small fragment at the start of the program that will be
  93  * the only code that directly reads the FRAG_ATTRIB_WPOS input.
  94  * All other code pieces that reference that input will be rewritten
  95  * to read from a newly allocated temporary.
  96  *
  97  */
  98 static void insert_WPOS_trailer(struct r300_fragment_program_compiler *compiler, struct r300_fragment_program * fp)
  99 {
 100         int i;
 101
 102         if (!(compiler->Base.Program.InputsRead & FRAG_BIT_WPOS)) {
 103                 fp->wpos_attr = FRAG_ATTRIB_MAX;
 104                 return;
 105         }
 106
 107         for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
 108         {
 109                 if (!(compiler->Base.Program.InputsRead & (1 << i))) {
 110                         fp->wpos_attr = i;
 111                         break;
 112                 }
 113         }
 114
 115         rc_transform_fragment_wpos(&compiler->Base, FRAG_ATTRIB_WPOS, fp->wpos_attr);
 116 }
 117
 118 /**
 119  * Rewrite fragment.fogcoord to use a texture coordinate slot.
 120  * Note that fogcoord is forced into an X001 pattern, and this enforcement
 121  * is done here.
 122  *
 123  * See also the counterpart rewriting for vertex programs.
 124  */
 125 static void rewriteFog(struct r300_fragment_program_compiler *compiler, struct r300_fragment_program * fp)
 126 {
 127         struct prog_src_register src;
 128         int i;
 129
 130         if (!(compiler->Base.Program.InputsRead & FRAG_BIT_FOGC)) {
 131                 fp->fog_attr = FRAG_ATTRIB_MAX;
 132                 return;
 133         }
 134
 135         for (i = FRAG_ATTRIB_TEX0; i <= FRAG_ATTRIB_TEX7; ++i)
 136         {
 137                 if (!(compiler->Base.Program.InputsRead & (1 << i))) {
 138                         fp->fog_attr = i;
 139                         break;
 140                 }
 141         }
 142
 143         memset(&src, 0, sizeof(src));
 144         src.File = PROGRAM_INPUT;
 145         src.Index = fp->fog_attr;
 146         src.Swizzle = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_ZERO, SWIZZLE_ZERO, SWIZZLE_ONE);
 147         rc_move_input(&compiler->Base, FRAG_ATTRIB_FOGC, src);
 148 }
 149
 150
 151 /**
 152  * Reserve hardware temporary registers for the program inputs.
 153  *
 154  * @note This allocation is performed explicitly, because the order of inputs
 155  * is determined by the RS hardware.
 156  */
 157 static void allocate_hw_inputs(
 158         struct r300_fragment_program_compiler * c,
 159         void (*allocate)(void * data, unsigned input, unsigned hwreg),
 160         void * mydata)
 161 {
 162         GLuint InputsRead = c->Base.Program.InputsRead;
 163         int i;
 164         GLuint hwindex = 0;
 165
 166         /* Primary colour */
 167         if (InputsRead & FRAG_BIT_COL0)
 168                 allocate(mydata, FRAG_ATTRIB_COL0, hwindex++);
 169         InputsRead &= ~FRAG_BIT_COL0;
 170
 171         /* Secondary color */
 172         if (InputsRead & FRAG_BIT_COL1)
 173                 allocate(mydata, FRAG_ATTRIB_COL1, hwindex++);
 174         InputsRead &= ~FRAG_BIT_COL1;
 175
 176         /* Texcoords */
 177         for (i = 0; i < 8; i++) {
 178                 if (InputsRead & (FRAG_BIT_TEX0 << i))
 179                         allocate(mydata, FRAG_ATTRIB_TEX0+i, hwindex++);
 180         }
 181         InputsRead &= ~FRAG_BITS_TEX_ANY;
 182
 183         /* Fogcoords treated as a texcoord */
 184         if (InputsRead & FRAG_BIT_FOGC)
 185                 allocate(mydata, FRAG_ATTRIB_FOGC, hwindex++);
 186         InputsRead &= ~FRAG_BIT_FOGC;
 187
 188         /* fragment position treated as a texcoord */
 189         if (InputsRead & FRAG_BIT_WPOS)
 190                 allocate(mydata, FRAG_ATTRIB_WPOS, hwindex++);
 191         InputsRead &= ~FRAG_BIT_WPOS;
 192
 193         /* Anything else */
 194         if (InputsRead)
 195                 rc_error(&c->Base, "Don't know how to handle inputs 0x%x\n", InputsRead);
 196 }
 197
 198
 199 static void translate_fragment_program(GLcontext *ctx, struct r300_fragment_program_cont *cont, struct r300_fragment_program *fp)
 200 {
 201         r300ContextPtr r300 = R300_CONTEXT(ctx);
 202         struct r300_fragment_program_compiler compiler;
 203
 204         rc_init(&compiler.Base);
 205         compiler.Base.Debug = (RADEON_DEBUG & DEBUG_PIXEL) ? GL_TRUE : GL_FALSE;
 206
 207         compiler.code = &fp->code;
 208         compiler.state = fp->state;
 209         compiler.is_r500 = (r300->radeon.radeonScreen->chip_family >= CHIP_FAMILY_RV515) ? GL_TRUE : GL_FALSE;
 210         compiler.OutputDepth = FRAG_RESULT_DEPTH;
 211         compiler.OutputColor = FRAG_RESULT_COLOR;
 212         compiler.AllocateHwInputs = &allocate_hw_inputs;
 213
 214         if (compiler.Base.Debug) {
 215                 fflush(stderr);
 216                 _mesa_printf("Fragment Program: Initial program:\n");
 217                 _mesa_print_program(&cont->Base.Base);
 218                 fflush(stderr);
 219         }
 220
 221         rc_mesa_to_rc_program(&compiler.Base, &cont->Base.Base);
 222
 223         insert_WPOS_trailer(&compiler, fp);
 224
 225         rewriteFog(&compiler, fp);
 226
 227         r3xx_compile_fragment_program(&compiler);
 228         fp->error = compiler.Base.Error;
 229
 230         fp->InputsRead = compiler.Base.Program.InputsRead;
 231
 232         rc_destroy(&compiler.Base);
 233 }
 234
 235 struct r300_fragment_program *r300SelectAndTranslateFragmentShader(GLcontext *ctx)
 236 {
 237         r300ContextPtr r300 = R300_CONTEXT(ctx);
 238         struct r300_fragment_program_cont *fp_list;
 239         struct r300_fragment_program *fp;
 240         struct r300_fragment_program_external_state state;
 241
 242         fp_list = (struct r300_fragment_program_cont *)ctx->FragmentProgram._Current;
 243         build_state(r300, ctx->FragmentProgram._Current, &state);
 244
 245         fp = fp_list->progs;
 246         while (fp) {
 247                 if (_mesa_memcmp(&fp->state, &state, sizeof(state)) == 0) {
 248                         return r300->selected_fp = fp;
 249                 }
 250                 fp = fp->next;
 251         }
 252
 253         fp = _mesa_calloc(sizeof(struct r300_fragment_program));
 254
 255         fp->state = state;
 256
 257         fp->next = fp_list->progs;
 258         fp_list->progs = fp;
 259
 260         translate_fragment_program(ctx, fp_list, fp);
 261
 262         return r300->selected_fp = fp;
 263 }