GPU: Add Image Load Store extension support

This wraps the functionality used to speedup EEVEE volumetrics.

This touches the rendering code of EEVEE as it should fix a mis-usage of
the GL barrier. The barrier changed type and location, removing an
unused barrier.

1 files changed, 18 insertions, 2 deletions

diff --git a/source/blender/gpu/opengl/gl_debug.cc b/source/blender/gpu/opengl/gl_debug.cc
index db99e90d0ec..747d8ee2e3e 100644
--- a/source/blender/gpu/opengl/gl_debug.cc
+++ b/source/blender/gpu/opengl/gl_debug.cc
@@ -200,13 +200,16 @@ void check_gl_resources(const char *info)
    * be big enough to feed the data range the shader awaits. */
   uint16_t ubo_needed = interface->enabled_ubo_mask_;
   ubo_needed &= ~ctx->bound_ubo_slots;
-
   /* NOTE: This only check binding. To be valid, the bound texture needs to
    * be the same format/target the shader expects. */
   uint64_t tex_needed = interface->enabled_tex_mask_;
   tex_needed &= ~GLContext::state_manager_active_get()->bound_texture_slots();
+  /* NOTE: This only check binding. To be valid, the bound image needs to
+   * be the same format/target the shader expects. */
+  uint8_t ima_needed = interface->enabled_ima_mask_;
+  ima_needed &= ~GLContext::state_manager_active_get()->bound_image_slots();
 
-  if (ubo_needed == 0 && tex_needed == 0) {
+  if (ubo_needed == 0 && tex_needed == 0 && ima_needed == 0) {
     return;
   }
 
@@ -223,6 +226,7 @@ void check_gl_resources(const char *info)
 
   for (int i = 0; tex_needed != 0; i++, tex_needed >>= 1) {
     if ((tex_needed & 1) != 0) {
+      /* FIXME: texture_get might return an image input instead. */
       const ShaderInput *tex_input = interface->texture_get(i);
       const char *tex_name = interface->input_name_get(tex_input);
       const char *sh_name = ctx->shader->name_get();
@@ -231,6 +235,18 @@ void check_gl_resources(const char *info)
       debug_callback(0, GL_DEBUG_TYPE_ERROR, 0, GL_DEBUG_SEVERITY_HIGH, 0, msg, NULL);
     }
   }
+
+  for (int i = 0; ima_needed != 0; i++, ima_needed >>= 1) {
+    if ((ima_needed & 1) != 0) {
+      /* FIXME: texture_get might return a texture input instead. */
+      const ShaderInput *tex_input = interface->texture_get(i);
+      const char *tex_name = interface->input_name_get(tex_input);
+      const char *sh_name = ctx->shader->name_get();
+      char msg[256];
+      SNPRINTF(msg, "Missing Image bind at slot %d : %s > %s : %s", i, sh_name, tex_name, info);
+      debug_callback(0, GL_DEBUG_TYPE_ERROR, 0, GL_DEBUG_SEVERITY_HIGH, 0, msg, NULL);
+    }
+  }
 }
 
 void raise_gl_error(const char *info)