[Mesa-dev] [PATCH 10/13] mesa: add new _mesa_Get[Compressed]TextureSubImage() functions

[Brian Paul]

Simple implementations in terms of get_[compressed_]texture_image().
---
 src/mesa/main/texgetimage.c | 38 ++++++++++++++++++++++++++++++++++++++
 src/mesa/main/texgetimage.h | 15 +++++++++++++++
 2 files changed, 53 insertions(+)

diff --git a/src/mesa/main/texgetimage.c b/src/mesa/main/texgetimage.c
index bcdcfe8..07da5f4 100644
--- a/src/mesa/main/texgetimage.c
+++ b/src/mesa/main/texgetimage.c
@@ -1367,6 +1367,22 @@ _mesa_GetTextureImage(GLuint texture, GLint level, GLenum format, GLenum type,
 }
 
 
+void GLAPIENTRY
+_mesa_GetTextureSubImage(GLuint texture, GLint level,
+                         GLint xoffset, GLint yoffset, GLint zoffset,
+                         GLsizei width, GLsizei height, GLsizei depth,
+                         GLenum format, GLenum type, GLsizei bufSize,
+                         void *pixels)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, texture);
+
+   get_texture_image(ctx, texObj, 0, level,
+                     xoffset, yoffset, zoffset, width, height, depth,
+                     format, type, bufSize, pixels, "glGetTextureSubImage");
+}
+
+
 
 /**
  * Do error checking for getting compressed texture images.
@@ -1423,6 +1439,10 @@ getcompressedteximage_error_check(struct gl_context *ctx,
 }
 
 
+/**
+ * Compute the number of bytes which will be written when retrieving
+ * a sub-region of a compressed texture.
+ */
 static GLsizei
 packed_compressed_size(GLuint dimensions, mesa_format format,
                        GLsizei width, GLsizei height, GLsizei depth,
@@ -1637,3 +1657,21 @@ _mesa_GetCompressedTextureImage(GLuint texture, GLint level,
                                 bufSize, pixels,
                                 "glGetCompressedTextureImage");
 }
+
+
+void APIENTRY
+_mesa_GetCompressedTextureSubImage(GLuint texture, GLint level,
+                                   GLint xoffset, GLint yoffset,
+                                   GLint zoffset, GLsizei width,
+                                   GLsizei height, GLsizei depth,
+                                   GLsizei bufSize, void *pixels)
+{
+   GET_CURRENT_CONTEXT(ctx);
+   struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, texture);
+
+   get_compressed_texture_image(ctx, texObj, 0, level,
+                                xoffset, yoffset, zoffset,
+                                width, height, depth,
+                                bufSize, pixels,
+                                "glGetCompressedTextureImage");
+}
diff --git a/src/mesa/main/texgetimage.h b/src/mesa/main/texgetimage.h
index 040495a..63c75eb 100644
--- a/src/mesa/main/texgetimage.h
+++ b/src/mesa/main/texgetimage.h
@@ -71,6 +71,14 @@ _mesa_GetTextureImage(GLuint texture, GLint level, GLenum format,
                       GLenum type, GLsizei bufSize, GLvoid *pixels);
 
 extern void GLAPIENTRY
+_mesa_GetTextureSubImage(GLuint texture, GLint level,
+                         GLint xoffset, GLint yoffset, GLint zoffset,
+                         GLsizei width, GLsizei height, GLsizei depth,
+                         GLenum format, GLenum type, GLsizei bufSize,
+                         void *pixels);
+
+
+extern void GLAPIENTRY
 _mesa_GetCompressedTexImage(GLenum target, GLint lod, GLvoid *img);
 
 extern void GLAPIENTRY
@@ -81,4 +89,11 @@ extern void GLAPIENTRY
 _mesa_GetCompressedTextureImage(GLuint texture, GLint level, GLsizei bufSize,
                                 GLvoid *pixels);
 
+extern void APIENTRY
+_mesa_GetCompressedTextureSubImage(GLuint texture, GLint level,
+                                   GLint xoffset, GLint yoffset,
+                                   GLint zoffset, GLsizei width,
+                                   GLsizei height, GLsizei depth,
+                                   GLsizei bufSize, void *pixels);
+
 #endif /* TEXGETIMAGE_H */
-- 
1.9.1