glsl2: Add flags to enable variable index lowering

3 files changed, 30 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index de78400d424..d08538ec20c 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -116,6 +116,13 @@ GLboolean brwCreateContext( int api,
       ctx->ShaderCompilerOptions[i].EmitNVTempInitialization = GL_TRUE;
       ctx->ShaderCompilerOptions[i].EmitNoNoise = GL_TRUE;
       ctx->ShaderCompilerOptions[i].EmitNoMainReturn = GL_TRUE;
+      ctx->ShaderCompilerOptions[i].EmitNoIndirectInput = GL_TRUE;
+      ctx->ShaderCompilerOptions[i].EmitNoIndirectOutput = GL_TRUE;
+
+      ctx->ShaderCompilerOptions[i].EmitNoIndirectUniform =
+	 (i == MESA_SHADER_FRAGMENT);
+      ctx->ShaderCompilerOptions[i].EmitNoIndirectTemp =
+	 (i == MESA_SHADER_FRAGMENT);
    }
 
    ctx->Const.VertexProgram.MaxNativeInstructions = (16 * 1024);
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 864805af0ef..fdf8100c8cd 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -2191,6 +2191,16 @@ struct gl_shader_compiler_options
    GLboolean EmitNoMainReturn;            /**< Emit CONT/RET opcodes? */
    GLboolean EmitNoNoise;                 /**< Emit NOISE opcodes? */
 
+   /**
+    * \name Forms of indirect addressing the driver cannot do.
+    */
+   /*@{*/
+   GLboolean EmitNoIndirectInput;   /**< No indirect addressing of inputs */
+   GLboolean EmitNoIndirectOutput;  /**< No indirect addressing of outputs */
+   GLboolean EmitNoIndirectTemp;    /**< No indirect addressing of temps */
+   GLboolean EmitNoIndirectUniform; /**< No indirect addressing of constants */
+   /*@}*/
+
    GLuint MaxUnrollIterations;
 
    struct gl_sl_pragmas DefaultPragmas; /**< Default #pragma settings */
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 227dfdbd50a..29b92821f6d 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -2745,6 +2745,19 @@ _mesa_ir_link_shader(GLcontext *ctx, struct gl_shader_program *prog)
 	 if (options->EmitNoNoise)
 	    progress = lower_noise(ir) || progress;
 
+	 /* If there are forms of indirect addressing that the driver
+	  * cannot handle, perform the lowering pass.
+	  */
+	 if (options->EmitNoIndirectInput || options->EmitNoIndirectOutput
+	     || options->EmitNoIndirectTemp || options->EmitNoIndirectUniform)
+	   progress =
+	     lower_variable_index_to_cond_assign(ir,
+						 options->EmitNoIndirectInput,
+						 options->EmitNoIndirectOutput,
+						 options->EmitNoIndirectTemp,
+						 options->EmitNoIndirectUniform)
+	     || progress;
+
 	 progress = do_vec_index_to_cond_assign(ir) || progress;
       } while (progress);