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 }
  28 #include "brw_fs.h"
  29 #include "../glsl/ir_optimization.h"
  30 #include "../glsl/ir_print_visitor.h"
  31
  32 struct gl_shader *
  33 brw_new_shader(struct gl_context *ctx, GLuint name, GLuint type)
  34 {
  35    struct brw_shader *shader;
  36
  37    shader = rzalloc(NULL, struct brw_shader);
  38    if (shader) {
  39       shader->base.Type = type;
  40       shader->base.Name = name;
  41       _mesa_init_shader(ctx, &shader->base);
  42    }
  43
  44    return &shader->base;
  45 }
  46
  47 struct gl_shader_program *
  48 brw_new_shader_program(struct gl_context *ctx, GLuint name)
  49 {
  50    struct brw_shader_program *prog;
  51    prog = rzalloc(NULL, struct brw_shader_program);
  52    if (prog) {
  53       prog->base.Name = name;
  54       _mesa_init_shader_program(ctx, &prog->base);
  55    }
  56    return &prog->base;
  57 }
  58
  59 /**
  60  * Performs a compile of the shader stages even when we don't know
  61  * what non-orthogonal state will be set, in the hope that it reflects
  62  * the eventual NOS used, and thus allows us to produce link failures.
  63  */
  64 bool
  65 brw_shader_precompile(struct gl_context *ctx, struct gl_shader_program *prog)
  66 {
  67    if (!brw_fs_precompile(ctx, prog))
  68       return false;
  69
  70    return true;
  71 }
  72
  73 GLboolean
  74 brw_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
  75 {
  76    struct brw_context *brw = brw_context(ctx);
  77    struct intel_context *intel = &brw->intel;
  78    unsigned int stage;
  79
  80    for (stage = 0; stage < ARRAY_SIZE(prog->_LinkedShaders); stage++) {
  81       struct brw_shader *shader =
  82          (struct brw_shader *)prog->_LinkedShaders[stage];
  83
  84       if (!shader)
  85          continue;
  86
  87       void *mem_ctx = ralloc_context(NULL);
  88       bool progress;
  89
  90       if (shader->ir)
  91          ralloc_free(shader->ir);
  92       shader->ir = new(shader) exec_list;
  93       clone_ir_list(mem_ctx, shader->ir, shader->base.ir);
  94
  95       do_mat_op_to_vec(shader->ir);
  96       lower_instructions(shader->ir,
  97                          MOD_TO_FRACT |
  98                          DIV_TO_MUL_RCP |
  99                          SUB_TO_ADD_NEG |
 100                          EXP_TO_EXP2 |
 101                          LOG_TO_LOG2);
 102
 103       /* Pre-gen6 HW can only nest if-statements 16 deep.  Beyond this,
 104        * if-statements need to be flattened.
 105        */
 106       if (intel->gen < 6)
 107          lower_if_to_cond_assign(shader->ir, 16);
 108
 109       do_lower_texture_projection(shader->ir);
 110       do_vec_index_to_cond_assign(shader->ir);
 111       brw_do_cubemap_normalize(shader->ir);
 112       lower_noise(shader->ir);
 113       lower_quadop_vector(shader->ir, false);
 114       lower_variable_index_to_cond_assign(shader->ir,
 115                                           GL_TRUE, /* input */
 116                                           GL_TRUE, /* output */
 117                                           GL_TRUE, /* temp */
 118                                           GL_TRUE /* uniform */
 119                                           );
 120
 121       do {
 122          progress = false;
 123
 124          if (stage == MESA_SHADER_FRAGMENT) {
 125             brw_do_channel_expressions(shader->ir);
 126             brw_do_vector_splitting(shader->ir);
 127          }
 128
 129          progress = do_lower_jumps(shader->ir, true, true,
 130                                    true, /* main return */
 131                                    false, /* continue */
 132                                    false /* loops */
 133                                    ) || progress;
 134
 135          progress = do_common_optimization(shader->ir, true, 32) || progress;
 136       } while (progress);
 137
 138       validate_ir_tree(shader->ir);
 139
 140       reparent_ir(shader->ir, shader->ir);
 141       ralloc_free(mem_ctx);
 142    }
 143
 144    if (!_mesa_ir_link_shader(ctx, prog))
 145       return GL_FALSE;
 146
 147    if (!brw_shader_precompile(ctx, prog))
 148       return GL_FALSE;
 149
 150    return GL_TRUE;
 151 }
 152
 153
 154 int
 155 brw_type_for_base_type(const struct glsl_type *type)
 156 {
 157    switch (type->base_type) {
 158    case GLSL_TYPE_FLOAT:
 159       return BRW_REGISTER_TYPE_F;
 160    case GLSL_TYPE_INT:
 161    case GLSL_TYPE_BOOL:
 162       return BRW_REGISTER_TYPE_D;
 163    case GLSL_TYPE_UINT:
 164       return BRW_REGISTER_TYPE_UD;
 165    case GLSL_TYPE_ARRAY:
 166    case GLSL_TYPE_STRUCT:
 167    case GLSL_TYPE_SAMPLER:
 168       /* These should be overridden with the type of the member when
 169        * dereferenced into.  BRW_REGISTER_TYPE_UD seems like a likely
 170        * way to trip up if we don't.
 171        */
 172       return BRW_REGISTER_TYPE_UD;
 173    default:
 174       assert(!"not reached");
 175       return BRW_REGISTER_TYPE_F;
 176    }
 177 }
 178
 179 uint32_t
 180 brw_conditional_for_comparison(unsigned int op)
 181 {
 182    switch (op) {
 183    case ir_binop_less:
 184       return BRW_CONDITIONAL_L;
 185    case ir_binop_greater:
 186       return BRW_CONDITIONAL_G;
 187    case ir_binop_lequal:
 188       return BRW_CONDITIONAL_LE;
 189    case ir_binop_gequal:
 190       return BRW_CONDITIONAL_GE;
 191    case ir_binop_equal:
 192    case ir_binop_all_equal: /* same as equal for scalars */
 193       return BRW_CONDITIONAL_Z;
 194    case ir_binop_nequal:
 195    case ir_binop_any_nequal: /* same as nequal for scalars */
 196       return BRW_CONDITIONAL_NZ;
 197    default:
 198       assert(!"not reached: bad operation for comparison");
 199       return BRW_CONDITIONAL_NZ;
 200    }
 201 }
 202
 203 uint32_t
 204 brw_math_function(enum opcode op)
 205 {
 206    switch (op) {
 207    case SHADER_OPCODE_RCP:
 208       return BRW_MATH_FUNCTION_INV;
 209    case SHADER_OPCODE_RSQ:
 210       return BRW_MATH_FUNCTION_RSQ;
 211    case SHADER_OPCODE_SQRT:
 212       return BRW_MATH_FUNCTION_SQRT;
 213    case SHADER_OPCODE_EXP2:
 214       return BRW_MATH_FUNCTION_EXP;
 215    case SHADER_OPCODE_LOG2:
 216       return BRW_MATH_FUNCTION_LOG;
 217    case SHADER_OPCODE_POW:
 218       return BRW_MATH_FUNCTION_POW;
 219    case SHADER_OPCODE_SIN:
 220       return BRW_MATH_FUNCTION_SIN;
 221    case SHADER_OPCODE_COS:
 222       return BRW_MATH_FUNCTION_COS;
 223    default:
 224       assert(!"not reached: unknown math function");
 225       return 0;
 226    }
 227 }