mesa: add flag for GL_NV_conditional_render extension

src/mesa/main/condrender.c

@@ -43,7 +43,7 @@ _mesa_BeginConditionalRender(GLuint queryId, GLenum mode)
    struct gl_query_object *q;
    GET_CURRENT_CONTEXT(ctx);
 
-   if (ctx->Query.CondRenderQuery) {
+   if (!ctx->Extensions.NV_conditional_render || ctx->Query.CondRenderQuery) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "glBeginConditionalRender()");
       return;
    }
@@ -89,7 +89,7 @@ _mesa_EndConditionalRender(void)
 {
    GET_CURRENT_CONTEXT(ctx);
 
-   if (!ctx->Query.CondRenderQuery) {
+   if (!ctx->Extensions.NV_conditional_render || !ctx->Query.CondRenderQuery) {
       _mesa_error(ctx, GL_INVALID_OPERATION, "glEndConditionalRender()");
       return;
    }

src/mesa/main/extensions.c

@@ -167,6 +167,7 @@ static const struct {
    { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
    { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
+   { OFF, "GL_NV_conditional_render",          F(NV_conditional_render) },
    { OFF, "GL_NV_depth_clamp",                 F(ARB_depth_clamp) },
    { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
    { OFF, "GL_NV_fragment_program_option",     F(NV_fragment_program_option) },

src/mesa/main/mtypes.h

@@ -2496,6 +2496,7 @@ struct gl_extensions
    GLboolean MESA_texture_array;
    GLboolean MESA_texture_signed_rgba;
    GLboolean NV_blend_square;
+   GLboolean NV_conditional_render;
    GLboolean NV_fragment_program;
    GLboolean NV_fragment_program_option;
    GLboolean NV_light_max_exponent;