[Mesa-dev] [PATCH 7/7] st/mesa: enable GL image extensions when backend supports them

[Ilia Mirkin]

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 at alum.mit.edu>
---
 src/mesa/state_tracker/st_extensions.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index d066784..f0fee88 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -223,6 +223,9 @@ 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.
        */
@@ -363,6 +366,19 @@ 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->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;
+   }
 }
 
 
-- 
2.4.10