[Mesa-dev] [v3 7/8] mesa: add texture_view helper function for TexStorage

[Courtney Goeltzenleuchter]

Add helper function to set texture_view state from TexStorage calls.

Signed-off-by: Courtney Goeltzenleuchter <courtney at LunarG.com>
---
 src/mesa/main/textureview.c | 59 +++++++++++++++++++++++++++++++++++++++++++++
 src/mesa/main/textureview.h |  4 +++
 2 files changed, 63 insertions(+)

diff --git a/src/mesa/main/textureview.c b/src/mesa/main/textureview.c
index 1858465..a25b928 100644
--- a/src/mesa/main/textureview.c
+++ b/src/mesa/main/textureview.c
@@ -379,6 +379,65 @@ compatible_format(struct gl_context *ctx, struct gl_texture_object *origTexObj,
                _mesa_lookup_enum_by_nr(origInternalFormat));
    return GL_FALSE;
 }
+/**
+ * Helper function for TexStorage to set TextureView state
+ */
+void
+set_texture_view_state(struct gl_context *ctx, struct gl_texture_object *texObj,
+                       GLenum target, GLuint levels)
+{
+   struct gl_texture_image *texImage;
+
+   /* Get a reference to what will become this View's base level */
+   texImage = _mesa_select_tex_image(ctx, texObj, target, 0);
+
+   /* If the command is successful,
+    * TEXTURE_IMMUTABLE_FORMAT becomes TRUE.
+    * TEXTURE_IMMUTABLE_LEVELS and TEXTURE_VIEW_NUM_LEVELS become levels.
+    * If the texture target is TEXTURE_1D_ARRAY then
+    * TEXTURE_VIEW_NUM_LAYERS becomes height.
+    * If the texture target is TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY,
+    * or TEXTURE_2D_MULTISAMPLE_ARRAY then TEXTURE_VIEW_NUM_LAYERS becomes depth.
+    * If the texture target is TEXTURE_CUBE_MAP, then
+    * TEXTURE_VIEW_NUM_LAYERS becomes 6.
+    * For any other texture target, TEXTURE_VIEW_NUM_LAYERS becomes 1.
+    * 
+    * ARB_texture_multisample: Multisample textures do
+    * not have multiple image levels.
+    */
+
+   texObj->Immutable = GL_TRUE;
+   texObj->ImmutableLevels = levels;
+   texObj->MinLevel = 0;
+   texObj->NumLevels = levels;
+   texObj->MinLayer = 0;
+   texObj->NumLayers = 1;
+   switch (target) {
+   case GL_TEXTURE_1D_ARRAY:
+      texObj->NumLayers = texImage->Height;
+      break;
+
+   case GL_TEXTURE_2D_MULTISAMPLE:
+      texObj->NumLevels = 1;
+      texObj->ImmutableLevels = 1;
+      break;
+
+   case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+      texObj->NumLevels = 1;
+      texObj->ImmutableLevels = 1;
+      /* fall through to set NumLayers */
+
+   case GL_TEXTURE_2D_ARRAY:
+   case GL_TEXTURE_CUBE_MAP_ARRAY:
+      texObj->NumLayers = texImage->Depth;
+      break;
+
+   case GL_TEXTURE_CUBE_MAP:
+      texObj->NumLayers = 6;
+      break;
+
+   }
+}
 
 /**
  * glTextureView (ARB_texture_view)
diff --git a/src/mesa/main/textureview.h b/src/mesa/main/textureview.h
index c2f0f32..36a8ed3 100644
--- a/src/mesa/main/textureview.h
+++ b/src/mesa/main/textureview.h
@@ -36,4 +36,8 @@ _mesa_TextureView(GLuint texture, GLenum target, GLuint origtexture,
                   GLuint minlevel, GLuint numlevels,
                   GLuint minlayer, GLuint numlayers);
 
+extern void
+set_texture_view_state(struct gl_context *ctx, struct gl_texture_object *texObj,
+                       GLenum target, GLuint levels);
+
 #endif /* TEXTUREVIEW_H */
-- 
1.8.1.2