src/mesa/drivers/dri/i965/brw_shader.cpp

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 extern "C" {
  25 #include "main/macros.h"
  26 #include "brw_context.h"
  27 #include "brw_vs.h"
  28 }
  29 #include "brw_fs.h"
  30 #include "glsl/ir_optimization.h"
  31 #include "glsl/ir_print_visitor.h"
  32
  33 struct gl_shader *
  34 brw_new_shader(struct gl_context *ctx, GLuint name, GLuint type)
  35 {
  36    struct brw_shader *shader;
  37
  38    shader = rzalloc(NULL, struct brw_shader);
  39    if (shader) {
  40       shader->base.Type = type;
  41       shader->base.Name = name;
  42       _mesa_init_shader(ctx, &shader->base);
  43    }
  44
  45    return &shader->base;
  46 }
  47
  48 struct gl_shader_program *
  49 brw_new_shader_program(struct gl_context *ctx, GLuint name)
  50 {
  51    struct brw_shader_program *prog;
  52    prog = rzalloc(NULL, struct brw_shader_program);
  53    if (prog) {
  54       prog->base.Name = name;
  55       _mesa_init_shader_program(ctx, &prog->base);
  56    }
  57    return &prog->base;
  58 }
  59
  60 /**
  61  * Performs a compile of the shader stages even when we don't know
  62  * what non-orthogonal state will be set, in the hope that it reflects
  63  * the eventual NOS used, and thus allows us to produce link failures.
  64  */
  65 static bool
  66 brw_shader_precompile(struct gl_context *ctx, struct gl_shader_program *prog)
  67 {
  68    struct brw_context *brw = brw_context(ctx);
  69
  70    if (brw->precompile && !brw_fs_precompile(ctx, prog))
  71       return false;
  72
  73    if (brw->precompile && !brw_vs_precompile(ctx, prog))
  74       return false;
  75
  76    return true;
  77 }
  78
  79 GLboolean
  80 brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
  81 {
  82    struct brw_context *brw = brw_context(ctx);
  83    struct intel_context *intel = &brw->intel;
  84    unsigned int stage;
  85
  86    for (stage = 0; stage < ARRAY_SIZE(shProg->_LinkedShaders); stage++) {
  87       struct brw_shader *shader =
  88          (struct brw_shader *)shProg->_LinkedShaders[stage];
  89       static const GLenum targets[] = {
  90          GL_VERTEX_PROGRAM_ARB,
  91          GL_FRAGMENT_PROGRAM_ARB,
  92          GL_GEOMETRY_PROGRAM_NV
  93       };
  94
  95       if (!shader)
  96          continue;
  97
  98       struct gl_program *prog =
  99          ctx->Driver.NewProgram(ctx, targets[stage], shader->base.Name);
 100       if (!prog)
 101         return false;
 102       prog->Parameters = _mesa_new_parameter_list();
 103
 104       _mesa_generate_parameters_list_for_uniforms(shProg, &shader->base,
 105                                                   prog->Parameters);
 106
 107       if (stage == 0) {
 108          struct gl_vertex_program *vp = (struct gl_vertex_program *) prog;
 109          vp->UsesClipDistance = shProg->Vert.UsesClipDistance;
 110       }
 111
 112       void *mem_ctx = ralloc_context(NULL);
 113       bool progress;
 114
 115       if (shader->ir)
 116          ralloc_free(shader->ir);
 117       shader->ir = new(shader) exec_list;
 118       clone_ir_list(mem_ctx, shader->ir, shader->base.ir);
 119
 120       do_mat_op_to_vec(shader->ir);
 121       lower_instructions(shader->ir,
 122                          MOD_TO_FRACT |
 123                          DIV_TO_MUL_RCP |
 124                          SUB_TO_ADD_NEG |
 125                          EXP_TO_EXP2 |
 126                          LOG_TO_LOG2);
 127
 128       /* Pre-gen6 HW can only nest if-statements 16 deep.  Beyond this,
 129        * if-statements need to be flattened.
 130        */
 131       if (intel->gen < 6)
 132          lower_if_to_cond_assign(shader->ir, 16);
 133
 134       do_lower_texture_projection(shader->ir);
 135       brw_lower_texture_gradients(shader->ir);
 136       do_vec_index_to_cond_assign(shader->ir);
 137       brw_do_cubemap_normalize(shader->ir);
 138       lower_noise(shader->ir);
 139       lower_quadop_vector(shader->ir, false);
 140
 141       bool input = true;
 142       bool output = stage == MESA_SHADER_FRAGMENT;
 143       bool temp = stage == MESA_SHADER_FRAGMENT;
 144       bool uniform = stage == MESA_SHADER_FRAGMENT;
 145
 146       lower_variable_index_to_cond_assign(shader->ir,
 147                                           input, output, temp, uniform);
 148
 149       /* FINISHME: Do this before the variable index lowering. */
 150       lower_ubo_reference(&shader->base, shader->ir);
 151
 152       do {
 153          progress = false;
 154
 155          if (stage == MESA_SHADER_FRAGMENT) {
 156             brw_do_channel_expressions(shader->ir);
 157             brw_do_vector_splitting(shader->ir);
 158          }
 159
 160          progress = do_lower_jumps(shader->ir, true, true,
 161                                    true, /* main return */
 162                                    false, /* continue */
 163                                    false /* loops */
 164                                    ) || progress;
 165
 166          progress = do_common_optimization(shader->ir, true, true, 32)
 167            || progress;
 168       } while (progress);
 169
 170       /* Make a pass over the IR to add state references for any built-in
 171        * uniforms that are used.  This has to be done now (during linking).
 172        * Code generation doesn't happen until the first time this shader is
 173        * used for rendering.  Waiting until then to generate the parameters is
 174        * too late.  At that point, the values for the built-in informs won't
 175        * get sent to the shader.
 176        */
 177       foreach_list(node, shader->ir) {
 178          ir_variable *var = ((ir_instruction *) node)->as_variable();
 179
 180          if ((var == NULL) || (var->mode != ir_var_uniform)
 181              || (strncmp(var->name, "gl_", 3) != 0))
 182             continue;
 183
 184          const ir_state_slot *const slots = var->state_slots;
 185          assert(var->state_slots != NULL);
 186
 187          for (unsigned int i = 0; i < var->num_state_slots; i++) {
 188             _mesa_add_state_reference(prog->Parameters,
 189                                       (gl_state_index *) slots[i].tokens);
 190          }
 191       }
 192
 193       validate_ir_tree(shader->ir);
 194
 195       reparent_ir(shader->ir, shader->ir);
 196       ralloc_free(mem_ctx);
 197
 198       do_set_program_inouts(shader->ir, prog,
 199                             shader->base.Type == GL_FRAGMENT_SHADER);
 200
 201       prog->SamplersUsed = shader->base.active_samplers;
 202       _mesa_update_shader_textures_used(shProg, prog);
 203
 204       _mesa_reference_program(ctx, &shader->base.Program, prog);
 205
 206       /* This has to be done last.  Any operation that can cause
 207        * prog->ParameterValues to get reallocated (e.g., anything that adds a
 208        * program constant) has to happen before creating this linkage.
 209        */
 210       _mesa_associate_uniform_storage(ctx, shProg, prog->Parameters);
 211
 212       _mesa_reference_program(ctx, &prog, NULL);
 213
 214       if (ctx->Shader.Flags & GLSL_DUMP) {
 215          static const char *target_strings[]
 216             = { "vertex", "fragment", "geometry" };
 217          printf("\n");
 218          printf("GLSL IR for linked %s program %d:\n", target_strings[stage],
 219                 shProg->Name);
 220          _mesa_print_ir(shader->base.ir, NULL);
 221       }
 222    }
 223
 224    if (!brw_shader_precompile(ctx, shProg))
 225       return false;
 226
 227    return true;
 228 }
 229
 230
 231 int
 232 brw_type_for_base_type(const struct glsl_type *type)
 233 {
 234    switch (type->base_type) {
 235    case GLSL_TYPE_FLOAT:
 236       return BRW_REGISTER_TYPE_F;
 237    case GLSL_TYPE_INT:
 238    case GLSL_TYPE_BOOL:
 239       return BRW_REGISTER_TYPE_D;
 240    case GLSL_TYPE_UINT:
 241       return BRW_REGISTER_TYPE_UD;
 242    case GLSL_TYPE_ARRAY:
 243       return brw_type_for_base_type(type->fields.array);
 244    case GLSL_TYPE_STRUCT:
 245    case GLSL_TYPE_SAMPLER:
 246       /* These should be overridden with the type of the member when
 247        * dereferenced into.  BRW_REGISTER_TYPE_UD seems like a likely
 248        * way to trip up if we don't.
 249        */
 250       return BRW_REGISTER_TYPE_UD;
 251    default:
 252       assert(!"not reached");
 253       return BRW_REGISTER_TYPE_F;
 254    }
 255 }
 256
 257 uint32_t
 258 brw_conditional_for_comparison(unsigned int op)
 259 {
 260    switch (op) {
 261    case ir_binop_less:
 262       return BRW_CONDITIONAL_L;
 263    case ir_binop_greater:
 264       return BRW_CONDITIONAL_G;
 265    case ir_binop_lequal:
 266       return BRW_CONDITIONAL_LE;
 267    case ir_binop_gequal:
 268       return BRW_CONDITIONAL_GE;
 269    case ir_binop_equal:
 270    case ir_binop_all_equal: /* same as equal for scalars */
 271       return BRW_CONDITIONAL_Z;
 272    case ir_binop_nequal:
 273    case ir_binop_any_nequal: /* same as nequal for scalars */
 274       return BRW_CONDITIONAL_NZ;
 275    default:
 276       assert(!"not reached: bad operation for comparison");
 277       return BRW_CONDITIONAL_NZ;
 278    }
 279 }
 280
 281 uint32_t
 282 brw_math_function(enum opcode op)
 283 {
 284    switch (op) {
 285    case SHADER_OPCODE_RCP:
 286       return BRW_MATH_FUNCTION_INV;
 287    case SHADER_OPCODE_RSQ:
 288       return BRW_MATH_FUNCTION_RSQ;
 289    case SHADER_OPCODE_SQRT:
 290       return BRW_MATH_FUNCTION_SQRT;
 291    case SHADER_OPCODE_EXP2:
 292       return BRW_MATH_FUNCTION_EXP;
 293    case SHADER_OPCODE_LOG2:
 294       return BRW_MATH_FUNCTION_LOG;
 295    case SHADER_OPCODE_POW:
 296       return BRW_MATH_FUNCTION_POW;
 297    case SHADER_OPCODE_SIN:
 298       return BRW_MATH_FUNCTION_SIN;
 299    case SHADER_OPCODE_COS:
 300       return BRW_MATH_FUNCTION_COS;
 301    case SHADER_OPCODE_INT_QUOTIENT:
 302       return BRW_MATH_FUNCTION_INT_DIV_QUOTIENT;
 303    case SHADER_OPCODE_INT_REMAINDER:
 304       return BRW_MATH_FUNCTION_INT_DIV_REMAINDER;
 305    default:
 306       assert(!"not reached: unknown math function");
 307       return 0;
 308    }
 309 }
 310
 311 uint32_t
 312 brw_texture_offset(ir_constant *offset)
 313 {
 314    assert(offset != NULL);
 315
 316    signed char offsets[3];
 317    for (unsigned i = 0; i < offset->type->vector_elements; i++)
 318       offsets[i] = (signed char) offset->value.i[i];
 319
 320    /* Combine all three offsets into a single unsigned dword:
 321     *
 322     *    bits 11:8 - U Offset (X component)
 323     *    bits  7:4 - V Offset (Y component)
 324     *    bits  3:0 - R Offset (Z component)
 325     */
 326    unsigned offset_bits = 0;
 327    for (unsigned i = 0; i < offset->type->vector_elements; i++) {
 328       const unsigned shift = 4 * (2 - i);
 329       offset_bits |= (offsets[i] << shift) & (0xF << shift);
 330    }
 331    return offset_bits;
 332 }