[Mesa-dev] [PATCH 5/5] glsl: Use Geom.VerticesOut == -1 to specify unset

[Ian Romanick]

From: Ian Romanick <ian.d.romanick at intel.com>

Because apparently layout(max_vertices=0) is a thing.

Signed-off-by: Ian Romanick <ian.d.romanick at intel.com>
Cc: "12.0" <mesa-stable at lists.freedesktop.org>
---
 src/compiler/glsl/glsl_parser_extras.cpp | 2 +-
 src/compiler/glsl/linker.cpp             | 8 ++++----
 src/mesa/main/shaderobj.c                | 2 +-
 3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index 843998d..2e3395e 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -1687,7 +1687,7 @@ set_shader_inout_layout(struct gl_shader *shader,
          shader->TessEval.PointMode = state->in_qualifier->point_mode;
       break;
    case MESA_SHADER_GEOMETRY:
-      shader->Geom.VerticesOut = 0;
+      shader->Geom.VerticesOut = -1;
       if (state->out_qualifier->flags.q.max_vertices) {
          unsigned qual_max_vertices;
          if (state->out_qualifier->max_vertices->
diff --git a/src/compiler/glsl/linker.cpp b/src/compiler/glsl/linker.cpp
index 010dbd7..0f01a97 100644
--- a/src/compiler/glsl/linker.cpp
+++ b/src/compiler/glsl/linker.cpp
@@ -1980,7 +1980,7 @@ link_gs_inout_layout_qualifiers(struct gl_shader_program *prog,
 				struct gl_shader **shader_list,
 				unsigned num_shaders)
 {
-   linked_shader->Geom.VerticesOut = 0;
+   linked_shader->Geom.VerticesOut = -1;
    linked_shader->Geom.Invocations = 0;
    linked_shader->Geom.InputType = PRIM_UNKNOWN;
    linked_shader->Geom.OutputType = PRIM_UNKNOWN;
@@ -2024,8 +2024,8 @@ link_gs_inout_layout_qualifiers(struct gl_shader_program *prog,
 	 linked_shader->Geom.OutputType = shader->Geom.OutputType;
       }
 
-      if (shader->Geom.VerticesOut != 0) {
-	 if (linked_shader->Geom.VerticesOut != 0 &&
+      if (shader->Geom.VerticesOut != -1) {
+	 if (linked_shader->Geom.VerticesOut != -1 &&
 	     linked_shader->Geom.VerticesOut != shader->Geom.VerticesOut) {
 	    linker_error(prog, "geometry shader defined with conflicting "
 			 "output vertex count (%d and %d)\n",
@@ -2067,7 +2067,7 @@ link_gs_inout_layout_qualifiers(struct gl_shader_program *prog,
    }
    prog->Geom.OutputType = linked_shader->Geom.OutputType;
 
-   if (linked_shader->Geom.VerticesOut == 0) {
+   if (linked_shader->Geom.VerticesOut == -1) {
       linker_error(prog,
 		   "geometry shader didn't declare max_vertices\n");
       return;
diff --git a/src/mesa/main/shaderobj.c b/src/mesa/main/shaderobj.c
index 274cb12..189317c 100644
--- a/src/mesa/main/shaderobj.c
+++ b/src/mesa/main/shaderobj.c
@@ -232,7 +232,7 @@ init_shader_program(struct gl_shader_program *prog)
    prog->FragDataBindings = string_to_uint_map_ctor();
    prog->FragDataIndexBindings = string_to_uint_map_ctor();
 
-   prog->Geom.VerticesOut = 0;
+   prog->Geom.VerticesOut = -1;
    prog->Geom.InputType = GL_TRIANGLES;
    prog->Geom.OutputType = GL_TRIANGLE_STRIP;
    prog->Geom.UsesEndPrimitive = false;
-- 
2.5.5