i965: Define and initialize image parameter structure.

This will be used to pass image meta-data to the shader when we cannot
use typed surface reads and writes.  All entries except surface_idx
and size are otherwise unused and will get eliminated by the uniform
packing pass.  size will be used for bounds checking with some image
formats and will be useful for ARB_shader_image_size too.  surface_idx
is always used.

v2: Add CS support.  Move the image_params array back to
    brw_stage_prog_data.
v3: Improve documentation.

Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_vs.c b/src/mesa/drivers/dri/i965/brw_vs.c
index 2b9b005..20bc7a9 100644
--- a/src/mesa/drivers/dri/i965/brw_vs.c
+++ b/src/mesa/drivers/dri/i965/brw_vs.c
@@ -122,7 +122,7 @@ brw_codegen_vs_prog(struct brw_context *brw,
        * conservative here.
        */
       param_count = vs->num_uniform_components * 4;
-
+      stage_prog_data->nr_image_params = vs->NumImages;
    } else {
       param_count = vp->program.Base.Parameters->NumParameters * 4;
    }
@@ -135,6 +135,9 @@ brw_codegen_vs_prog(struct brw_context *brw,
       rzalloc_array(NULL, const gl_constant_value *, param_count);
    stage_prog_data->pull_param =
       rzalloc_array(NULL, const gl_constant_value *, param_count);
+   stage_prog_data->image_param =
+      rzalloc_array(NULL, struct brw_image_param,
+                    stage_prog_data->nr_image_params);
    stage_prog_data->nr_params = param_count;
 
    GLbitfield64 outputs_written = vp->program.Base.OutputsWritten;