st/mesa: enable GL image extensions when backend supports them

This enables ARB_shader_image_load_store and ARB_shader_image_size when
the backend claims support for these. It will also implicitly enable the
image component of ARB_shader_texture_image_samples.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index bdfbded..57eeed6 100644 (file)
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -226,6 +226,9 @@ void st_init_limits(struct pipe_screen *screen,
             screen, sh, PIPE_SHADER_CAP_MAX_SHADER_BUFFERS) / 2;
       pc->MaxShaderStorageBlocks = pc->MaxAtomicBuffers;
 
+      pc->MaxImageUniforms = screen->get_shader_param(
+            screen, sh, PIPE_SHADER_CAP_MAX_SHADER_IMAGES);
+
       /* Gallium doesn't really care about local vs. env parameters so use the
        * same limits.
        */
@@ -371,6 +374,20 @@ void st_init_limits(struct pipe_screen *screen,
       c->MaxShaderStorageBlockSize = 1 << 27;
       extensions->ARB_shader_storage_buffer_object = GL_TRUE;
    }
+
+   c->MaxCombinedImageUniforms =
+         c->Program[MESA_SHADER_VERTEX].MaxImageUniforms +
+         c->Program[MESA_SHADER_TESS_CTRL].MaxImageUniforms +
+         c->Program[MESA_SHADER_TESS_EVAL].MaxImageUniforms +
+         c->Program[MESA_SHADER_GEOMETRY].MaxImageUniforms +
+         c->Program[MESA_SHADER_FRAGMENT].MaxImageUniforms +
+         c->Program[MESA_SHADER_COMPUTE].MaxImageUniforms;
+   c->MaxImageUnits = MAX_IMAGE_UNITS;
+   c->MaxImageSamples = 0; /* XXX */
+   if (c->MaxCombinedImageUniforms) {
+      extensions->ARB_shader_image_load_store = GL_TRUE;
+      extensions->ARB_shader_image_size = GL_TRUE;
+   }
 }