glsl: Optionally lower TCS gl_PatchVerticesIn to a uniform.

[mesa.git] / src / compiler / glsl / builtin_variables.cpp

diff --git a/src/compiler/glsl/builtin_variables.cpp b/src/compiler/glsl/builtin_variables.cpp
index 401c7136659d2e984e4c0fd0721ee90d83bd9cf2..e1a95e3bf8cddc1fb07ff5857e2ab005a7212ca8 100644 (file)
--- a/src/compiler/glsl/builtin_variables.cpp
+++ b/src/compiler/glsl/builtin_variables.cpp
@@ -37,6 +37,11 @@ static const struct gl_builtin_uniform_element gl_NumSamples_elements[] = {
    {NULL, {STATE_NUM_SAMPLES, 0, 0}, SWIZZLE_XXXX}
 };
 
+/* only for TCS */
+static const struct gl_builtin_uniform_element gl_PatchVerticesIn_elements[] = {
+   {NULL, {STATE_INTERNAL, STATE_TCS_PATCH_VERTICES_IN}, SWIZZLE_XXXX}
+};
+
 static const struct gl_builtin_uniform_element gl_DepthRange_elements[] = {
    {"near", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_XXXX},
    {"far", {STATE_DEPTH_RANGE, 0, 0}, SWIZZLE_YYYY},
@@ -234,6 +239,7 @@ static const struct gl_builtin_uniform_element gl_NormalMatrix_elements[] = {
 #define STATEVAR(name) {#name, name ## _elements, ARRAY_SIZE(name ## _elements)}
 
 static const struct gl_builtin_uniform_desc _mesa_builtin_uniform_desc[] = {
+   STATEVAR(gl_PatchVerticesIn),
    STATEVAR(gl_NumSamples),
    STATEVAR(gl_DepthRange),
    STATEVAR(gl_ClipPlane),
@@ -864,7 +870,7 @@ builtin_variable_generator::generate_constants()
       }
    }
 
-   if (state->is_version(450, 310) ||
+   if (state->is_version(440, 310) ||
        state->ARB_ES3_1_compatibility_enable) {
       add_const("gl_MaxCombinedShaderOutputResources",
                 state->Const.MaxCombinedShaderOutputResources);
@@ -1029,9 +1035,14 @@ void
 builtin_variable_generator::generate_tcs_special_vars()
 {
    add_system_value(SYSTEM_VALUE_PRIMITIVE_ID, int_t, "gl_PrimitiveID");
-   add_system_value(SYSTEM_VALUE_VERTICES_IN, int_t, "gl_PatchVerticesIn");
    add_system_value(SYSTEM_VALUE_INVOCATION_ID, int_t, "gl_InvocationID");
 
+   if (state->ctx->Const.LowerTCSPatchVerticesIn) {
+      add_uniform(int_t, "gl_PatchVerticesIn");
+   } else {
+      add_system_value(SYSTEM_VALUE_VERTICES_IN, int_t, "gl_PatchVerticesIn");
+   }
+
    add_output(VARYING_SLOT_TESS_LEVEL_OUTER, array(float_t, 4),
               "gl_TessLevelOuter")->data.patch = 1;
    add_output(VARYING_SLOT_TESS_LEVEL_INNER, array(float_t, 2),
@@ -1201,8 +1212,15 @@ builtin_variable_generator::generate_cs_special_vars()
                     "gl_LocalInvocationID");
    add_system_value(SYSTEM_VALUE_WORK_GROUP_ID, uvec3_t, "gl_WorkGroupID");
    add_system_value(SYSTEM_VALUE_NUM_WORK_GROUPS, uvec3_t, "gl_NumWorkGroups");
-   add_variable("gl_GlobalInvocationID", uvec3_t, ir_var_auto, 0);
-   add_variable("gl_LocalInvocationIndex", uint_t, ir_var_auto, 0);
+   if (state->ctx->Const.LowerCsDerivedVariables) {
+      add_variable("gl_GlobalInvocationID", uvec3_t, ir_var_auto, 0);
+      add_variable("gl_LocalInvocationIndex", uint_t, ir_var_auto, 0);
+   } else {
+      add_system_value(SYSTEM_VALUE_GLOBAL_INVOCATION_ID,
+                       uvec3_t, "gl_GlobalInvocationID");
+      add_system_value(SYSTEM_VALUE_LOCAL_INVOCATION_INDEX,
+                       uint_t, "gl_LocalInvocationIndex");
+   }
 }
 
 
@@ -1431,16 +1449,16 @@ initialize_cs_derived_variables(gl_shader *shader,
  * These are initialized in the main function.
  */
 void
-_mesa_glsl_initialize_derived_variables(gl_shader *shader)
+_mesa_glsl_initialize_derived_variables(struct gl_context *ctx,
+                                        gl_shader *shader)
 {
    /* We only need to set CS variables currently. */
-   if (shader->Stage != MESA_SHADER_COMPUTE)
-      return;
+   if (shader->Stage == MESA_SHADER_COMPUTE &&
+       ctx->Const.LowerCsDerivedVariables) {
+      ir_function_signature *const main_sig =
+         _mesa_get_main_function_signature(shader);
 
-   ir_function_signature *const main_sig =
-      _mesa_get_main_function_signature(shader);
-   if (main_sig == NULL)
-      return;
-
-   initialize_cs_derived_variables(shader, main_sig);
+      if (main_sig != NULL)
+         initialize_cs_derived_variables(shader, main_sig);
+   }
 }