nir: gather which images are MSAA

Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5209>

2 files changed, 7 insertions, 8 deletions

diff --git a/src/compiler/nir/nir_gather_info.c b/src/compiler/nir/nir_gather_info.c
index 5a2f8cfc06a..3a65c27b02e 100644
--- a/src/compiler/nir/nir_gather_info.c
+++ b/src/compiler/nir/nir_gather_info.c
@@ -598,7 +598,7 @@ nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint)
    shader->info.num_textures = 0;
    shader->info.num_images = 0;
    shader->info.image_buffers = 0;
-   shader->info.last_msaa_image = -1;
+   shader->info.msaa_images = 0;
 
    nir_foreach_variable(var, &shader->uniforms) {
       /* Bindless textures and images don't use non-bindless slots.
@@ -618,13 +618,12 @@ nir_shader_gather_info(nir_shader *shader, nir_function_impl *entrypoint)
             shader->info.image_buffers |=
                BITFIELD_RANGE(shader->info.num_images, num_image_slots);
          }
+         if (glsl_get_sampler_dim(image_type) == GLSL_SAMPLER_DIM_MS) {
+            shader->info.msaa_images |=
+               BITFIELD_RANGE(shader->info.num_images, num_image_slots);
+         }
          shader->info.num_images += num_image_slots;
       }
-
-      /* Assuming image slots don't have holes (e.g. OpenGL) */
-      if (glsl_type_is_image(var->type) &&
-          glsl_get_sampler_dim(var->type) == GLSL_SAMPLER_DIM_MS)
-         shader->info.last_msaa_image = shader->info.num_images - 1;
    }
 
    shader->info.inputs_read = 0;
diff --git a/src/compiler/shader_info.h b/src/compiler/shader_info.h
index 6537008af93..57b0eabd79a 100644
--- a/src/compiler/shader_info.h
+++ b/src/compiler/shader_info.h
@@ -116,8 +116,6 @@ typedef struct shader_info {
    uint8_t num_ssbos;
    /* Number of images used by this shader */
    uint8_t num_images;
-   /* Index of the last MSAA image. */
-   int8_t last_msaa_image;
 
    /* Which inputs are actually read */
    uint64_t inputs_read;
@@ -154,6 +152,8 @@ typedef struct shader_info {
    uint32_t images_used;
    /** Bitfield of which images are buffers. */
    uint32_t image_buffers;
+   /** Bitfield of which images are MSAA. */
+   uint32_t msaa_images;
 
    /* SPV_KHR_float_controls: execution mode for floating point ops */
    uint16_t float_controls_execution_mode;