And to check if it can have layers at all. This will be used by the
implementation of ARB_shader_image_load_store.
---
src/mesa/main/teximage.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
src/mesa/main/teximage.h | 6 ++++
2 files changed, 91 insertions(+)
diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index 793c5d3..77697ea 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -1091,6 +1091,91 @@ _mesa_get_texture_dimensions(GLenum target)
/**
+ * Check if a texture target can have more than one layer.
+ */
+GLboolean
+_mesa_tex_target_is_layered(GLenum target)
+{
+ switch (target) {
+ case GL_TEXTURE_1D:
+ case GL_PROXY_TEXTURE_1D:
+ case GL_TEXTURE_2D:
+ case GL_PROXY_TEXTURE_2D:
+ case GL_TEXTURE_RECTANGLE:
+ case GL_PROXY_TEXTURE_RECTANGLE:
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ case GL_PROXY_TEXTURE_2D_MULTISAMPLE:
+ case GL_TEXTURE_BUFFER:
+ case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
+ case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
+ case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
+ case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
+ case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
+ case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
+ case GL_TEXTURE_EXTERNAL_OES:
+ return GL_FALSE;
+
+ case GL_TEXTURE_3D:
+ case GL_PROXY_TEXTURE_3D:
+ case GL_TEXTURE_CUBE_MAP:
+ case GL_PROXY_TEXTURE_CUBE_MAP:
+ case GL_TEXTURE_1D_ARRAY:
+ case GL_PROXY_TEXTURE_1D_ARRAY:
+ case GL_TEXTURE_2D_ARRAY:
+ case GL_PROXY_TEXTURE_2D_ARRAY:
+ case GL_TEXTURE_CUBE_MAP_ARRAY:
+ case GL_PROXY_TEXTURE_CUBE_MAP_ARRAY:
+ case GL_TEXTURE_2D_MULTISAMPLE_ARRAY:
+ case GL_PROXY_TEXTURE_2D_MULTISAMPLE_ARRAY:
+ return GL_TRUE;
+
+ default:
+ unreachable();
+ }
+}
+
+
+/**
+ * Return the number of layers present in the given level of an array,
+ * cubemap or 3D texture. If the texture is not layered return zero.
+ */
+GLuint
+_mesa_get_texture_layers(struct gl_texture_object *texObj, GLint level)
+{
+ assert(level >= 0 && level < MAX_TEXTURE_LEVELS);
+
+ switch (texObj->Target) {
+ case GL_TEXTURE_1D:
+ case GL_TEXTURE_2D:
+ case GL_TEXTURE_RECTANGLE:
+ case GL_TEXTURE_2D_MULTISAMPLE:
+ case GL_TEXTURE_BUFFER:
+ case GL_TEXTURE_EXTERNAL_OES:
+ return 0;
+
+ case GL_TEXTURE_CUBE_MAP:
+ return 6;
+
+ case GL_TEXTURE_1D_ARRAY: {
+ struct gl_texture_image *img = texObj->Image[0][level];
+ return (img ? img->Height : 0);
+ }
+
+ case GL_TEXTURE_3D:
+ case GL_TEXTURE_2D_ARRAY:
+ case GL_TEXTURE_CUBE_MAP_ARRAY:
+ case GL_TEXTURE_2D_MULTISAMPLE_ARRAY: {
+ struct gl_texture_image *img = texObj->Image[0][level];
+ return (img ? img->Depth : 0);
+ }
+
+ default:
+ unreachable();
+ }
+}
+
+
+/**
* Return the maximum number of mipmap levels for the given target
* and the dimensions.
* The dimensions are expected not to include the border.
diff --git a/src/mesa/main/teximage.h b/src/mesa/main/teximage.h
index 792383d..fcee071 100644
--- a/src/mesa/main/teximage.h
+++ b/src/mesa/main/teximage.h
@@ -138,6 +138,12 @@ _mesa_tex_target_to_face(GLenum target);
extern GLint
_mesa_get_texture_dimensions(GLenum target);
+extern GLboolean
+_mesa_tex_target_is_layered(GLenum target);
+
+extern GLuint
+_mesa_get_texture_layers(struct gl_texture_object *texObj, GLint level);
+
extern GLsizei
_mesa_get_tex_max_num_levels(GLenum target, GLsizei width, GLsizei height,
GLsizei depth);
--
1.8.4
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