mesa: Export shader image format to mesa format conversion function.

This function will be useful for back-ends to translate an image internal
format as specified in GLSL code into a mesa format.

Reviewed-by: Matt Turner <[email protected]>

2 files changed, 12 insertions, 5 deletions

diff --git a/src/mesa/main/shaderimage.c b/src/mesa/main/shaderimage.c
index dcbcca62360..f8120731e5a 100644
--- a/src/mesa/main/shaderimage.c
+++ b/src/mesa/main/shaderimage.c
@@ -58,8 +58,8 @@
 # define MESA_FORMAT_SIGNED_RG_8 MESA_FORMAT_R8G8_SNORM
 #endif
 
-static mesa_format
-get_image_format(GLenum format)
+mesa_format
+_mesa_get_shader_image_format(GLenum format)
 {
    switch (format) {
    case GL_RGBA32F:
@@ -421,7 +421,7 @@ validate_bind_image_texture(struct gl_context *ctx, GLuint unit,
       return GL_FALSE;
    }
 
-   if (!get_image_format(format)) {
+   if (!_mesa_get_shader_image_format(format)) {
       _mesa_error(ctx, GL_INVALID_VALUE, "glBindImageTexture(format)");
       return GL_FALSE;
    }
@@ -458,7 +458,7 @@ _mesa_BindImageTexture(GLuint unit, GLuint texture, GLint level,
       u->Level = level;
       u->Access = access;
       u->Format = format;
-      u->_ActualFormat = get_image_format(format);
+      u->_ActualFormat = _mesa_get_shader_image_format(format);
 
       if (_mesa_tex_target_is_layered(t->Target)) {
          u->Layered = layered;
@@ -573,7 +573,7 @@ _mesa_BindImageTextures(GLuint first, GLsizei count, const GLuint *textures)
             continue;
          }
 
-         actualFormat = get_image_format(image->InternalFormat);
+         actualFormat = _mesa_get_shader_image_format(image->InternalFormat);
 
          if (actualFormat == MESA_FORMAT_NONE) {
             /* The ARB_multi_bind spec says:
diff --git a/src/mesa/main/shaderimage.h b/src/mesa/main/shaderimage.h
index 733ac774777..4aa859ca5cc 100644
--- a/src/mesa/main/shaderimage.h
+++ b/src/mesa/main/shaderimage.h
@@ -28,10 +28,17 @@
 #define SHADERIMAGE_H
 
 #include "glheader.h"
+#include "formats.h"
 
 struct gl_context;
 
 /**
+ * Get the matching mesa_format for a shader image format GL enum.
+ */
+mesa_format
+_mesa_get_shader_image_format(GLenum format);
+
+/**
  * Recalculate the \c _Valid flag of a context's shader image units.
  *
  * To be called when the state of any texture bound to an image unit