[Mesa-dev] [PATCH v4 (part2) 45/59] glsl: fix UNIFORM_BUFFER_START or UNIFORM_BUFFER_SIZE query when no buffer object is bound

[Iago Toral Quiroga]

From: Samuel Iglesias Gonsalvez <siglesias at igalia.com>

According to ARB_uniform_buffer_object spec:

"If the parameter (starting offset or size) was not specified when the
 buffer object was bound (e.g. if bound with BindBufferBase), or if no
 buffer object is bound to <index>, zero is returned."

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias at igalia.com>
---
 src/mesa/main/get.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/mesa/main/get.c b/src/mesa/main/get.c
index e2bfb5f..b89c49f 100644
--- a/src/mesa/main/get.c
+++ b/src/mesa/main/get.c
@@ -1925,7 +1925,8 @@ find_value_indexed(const char *func, GLenum pname, GLuint index, union value *v)
 	 goto invalid_value;
       if (!ctx->Extensions.ARB_uniform_buffer_object)
 	 goto invalid_enum;
-      v->value_int = ctx->UniformBufferBindings[index].Offset;
+      v->value_int = ctx->UniformBufferBindings[index].Offset < 0 ? 0 :
+                     ctx->UniformBufferBindings[index].Offset;
       return TYPE_INT;
 
    case GL_UNIFORM_BUFFER_SIZE:
@@ -1933,7 +1934,8 @@ find_value_indexed(const char *func, GLenum pname, GLuint index, union value *v)
 	 goto invalid_value;
       if (!ctx->Extensions.ARB_uniform_buffer_object)
 	 goto invalid_enum;
-      v->value_int = ctx->UniformBufferBindings[index].Size;
+      v->value_int = ctx->UniformBufferBindings[index].Size < 0 ? 0 :
+                     ctx->UniformBufferBindings[index].Size;
       return TYPE_INT;
 
    /* ARB_shader_storage_buffer_object */
-- 
1.9.1