Mesa (master): i965/fs_surface_builder: Add a helper for converting GL to ISL formats

[Jason Ekstrand]

Module: Mesa
Branch: master
Commit: 1831fa104c706658741dabeac03ed7e3bf48ed5f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1831fa104c706658741dabeac03ed7e3bf48ed5f

Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Fri Apr 15 16:38:18 2016 -0700

i965/fs_surface_builder: Add a helper for converting GL to ISL formats

Reviewed-by: Chad Versace <chad.versace at intel.com>

---

 .../drivers/dri/i965/brw_fs_surface_builder.cpp    | 55 ++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp b/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp
index 0932336..23ad511 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp
@@ -21,6 +21,7 @@
  * IN THE SOFTWARE.
  */
 
+#include "isl/isl.h"
 #include "main/shaderimage.h"
 #include "brw_fs_surface_builder.h"
 #include "brw_fs.h"
@@ -165,6 +166,60 @@ namespace brw {
 
 namespace {
    namespace image_format_info {
+      /* The higher compiler layers use the GL enums for image formats even if
+       * they come in from SPIR-V or Vulkan.  We need to turn them into an ISL
+       * enum before we can use them.
+       */
+      enum isl_format
+      isl_format_for_gl_format(uint32_t gl_format)
+      {
+         switch (gl_format) {
+         case GL_R8:             return ISL_FORMAT_R8_UNORM;
+         case GL_R8_SNORM:       return ISL_FORMAT_R8_SNORM;
+         case GL_R8UI:           return ISL_FORMAT_R8_UINT;
+         case GL_R8I:            return ISL_FORMAT_R8_SINT;
+         case GL_RG8:            return ISL_FORMAT_R8G8_UNORM;
+         case GL_RG8_SNORM:      return ISL_FORMAT_R8G8_SNORM;
+         case GL_RG8UI:          return ISL_FORMAT_R8G8_UINT;
+         case GL_RG8I:           return ISL_FORMAT_R8G8_SINT;
+         case GL_RGBA8:          return ISL_FORMAT_R8G8B8A8_UNORM;
+         case GL_RGBA8_SNORM:    return ISL_FORMAT_R8G8B8A8_SNORM;
+         case GL_RGBA8UI:        return ISL_FORMAT_R8G8B8A8_UINT;
+         case GL_RGBA8I:         return ISL_FORMAT_R8G8B8A8_SINT;
+         case GL_R11F_G11F_B10F: return ISL_FORMAT_R11G11B10_FLOAT;
+         case GL_RGB10_A2:       return ISL_FORMAT_R10G10B10A2_UNORM;
+         case GL_RGB10_A2UI:     return ISL_FORMAT_R10G10B10A2_UINT;
+         case GL_R16:            return ISL_FORMAT_R16_UNORM;
+         case GL_R16_SNORM:      return ISL_FORMAT_R16_SNORM;
+         case GL_R16F:           return ISL_FORMAT_R16_FLOAT;
+         case GL_R16UI:          return ISL_FORMAT_R16_UINT;
+         case GL_R16I:           return ISL_FORMAT_R16_SINT;
+         case GL_RG16:           return ISL_FORMAT_R16G16_UNORM;
+         case GL_RG16_SNORM:     return ISL_FORMAT_R16G16_SNORM;
+         case GL_RG16F:          return ISL_FORMAT_R16G16_FLOAT;
+         case GL_RG16UI:         return ISL_FORMAT_R16G16_UINT;
+         case GL_RG16I:          return ISL_FORMAT_R16G16_SINT;
+         case GL_RGBA16:         return ISL_FORMAT_R16G16B16A16_UNORM;
+         case GL_RGBA16_SNORM:   return ISL_FORMAT_R16G16B16A16_SNORM;
+         case GL_RGBA16F:        return ISL_FORMAT_R16G16B16A16_FLOAT;
+         case GL_RGBA16UI:       return ISL_FORMAT_R16G16B16A16_UINT;
+         case GL_RGBA16I:        return ISL_FORMAT_R16G16B16A16_SINT;
+         case GL_R32F:           return ISL_FORMAT_R32_FLOAT;
+         case GL_R32UI:          return ISL_FORMAT_R32_UINT;
+         case GL_R32I:           return ISL_FORMAT_R32_SINT;
+         case GL_RG32F:          return ISL_FORMAT_R32G32_FLOAT;
+         case GL_RG32UI:         return ISL_FORMAT_R32G32_UINT;
+         case GL_RG32I:          return ISL_FORMAT_R32G32_SINT;
+         case GL_RGBA32F:        return ISL_FORMAT_R32G32B32A32_FLOAT;
+         case GL_RGBA32UI:       return ISL_FORMAT_R32G32B32A32_UINT;
+         case GL_RGBA32I:        return ISL_FORMAT_R32G32B32A32_SINT;
+         case GL_NONE:           return ISL_FORMAT_UNSUPPORTED;
+         default:
+            assert(!"Invalid image format");
+            return ISL_FORMAT_UNSUPPORTED;
+         }
+      }
+
       /**
        * Simple 4-tuple of scalars used to pass around per-color component
        * values.