glsl2: Add EmitNoNoise flag, use it to remove noise opcodes

src/mesa/drivers/dri/i915/i915_context.c

@@ -179,6 +179,7 @@ i915CreateContext(int api,
     */
    ctx->ShaderCompilerOptions[MESA_SHADER_VERTEX].EmitCondCodes = GL_TRUE;
    ctx->ShaderCompilerOptions[MESA_SHADER_FRAGMENT].EmitNoIfs = GL_TRUE;
+   ctx->ShaderCompilerOptions[MESA_SHADER_FRAGMENT].EmitNoNoise = GL_TRUE;
 
    ctx->Const.MaxDrawBuffers = 1;
 

src/mesa/drivers/dri/i965/brw_context.c

@@ -114,6 +114,7 @@ GLboolean brwCreateContext( int api,
    for (i = 0; i <= MESA_SHADER_FRAGMENT; i++) {
       ctx->ShaderCompilerOptions[i].EmitCondCodes = GL_TRUE;
       ctx->ShaderCompilerOptions[i].EmitNVTempInitialization = GL_TRUE;
+      ctx->ShaderCompilerOptions[i].EmitNoNoise = GL_TRUE;
    }
 
    ctx->Const.VertexProgram.MaxNativeInstructions = (16 * 1024);

src/mesa/main/mtypes.h

@@ -2199,6 +2199,7 @@ struct gl_shader_compiler_options
    GLboolean EmitNoFunctions;
    GLboolean EmitNoCont;                  /**< Emit CONT opcode? */
    GLboolean EmitNoMainReturn;            /**< Emit CONT/RET opcodes? */
+   GLboolean EmitNoNoise;                 /**< Emit NOISE opcodes? */
 
    GLuint MaxUnrollIterations;
 

src/mesa/main/shaderapi.c

@@ -96,21 +96,12 @@ _mesa_init_shader_state(GLcontext *ctx)
     */
    struct gl_shader_compiler_options options;
    GLuint i;
-   options.EmitHighLevelInstructions = GL_TRUE;
-   options.EmitCondCodes = GL_FALSE;
-   options.EmitComments = GL_FALSE;
-   options.EmitNoIfs = GL_FALSE;
-   options.EmitNoLoops = GL_FALSE;
-   options.EmitNoFunctions = GL_FALSE;
-   options.EmitNoCont = GL_FALSE;
-   options.EmitNoMainReturn = GL_FALSE;
+
+   memset(&options, 0, sizeof(options));
    options.MaxUnrollIterations = 32;
 
    /* Default pragma settings */
-   options.DefaultPragmas.IgnoreOptimize = GL_FALSE;
-   options.DefaultPragmas.IgnoreDebug = GL_FALSE;
    options.DefaultPragmas.Optimize = GL_TRUE;
-   options.DefaultPragmas.Debug = GL_FALSE;
 
    for(i = 0; i < MESA_SHADER_TYPES; ++i)
       memcpy(&ctx->ShaderCompilerOptions[i], &options, sizeof(options));

src/mesa/program/ir_to_mesa.cpp

@@ -2734,6 +2734,9 @@ _mesa_ir_link_shader(GLcontext *ctx, struct gl_shader_program *prog)
 	 if (options->EmitNoIfs)
 	    progress = do_if_to_cond_assign(ir) || progress;
 
+	 if (options->EmitNoNoise)
+	    progress = lower_noise(ir) || progress;
+
 	 progress = do_vec_index_to_cond_assign(ir) || progress;
       } while (progress);