Mesa (master): st/mesa: implement ARB_clear_texture

[Ilia Mirkin]

Module: Mesa
Branch: master
Commit: ae39b0fda81ce592b8c965b715469650d35e5fef
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ae39b0fda81ce592b8c965b715469650d35e5fef

Author: Ilia Mirkin <imirkin at alum.mit.edu>
Date:   Tue Mar  4 21:51:55 2014 -0500

st/mesa: implement ARB_clear_texture

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 src/mesa/state_tracker/st_cb_texture.c |   29 +++++++++++++++++++++++++++++
 src/mesa/state_tracker/st_extensions.c |    1 +
 2 files changed, 30 insertions(+)

diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index d4c916e..62f149a 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -1873,6 +1873,34 @@ st_TextureView(struct gl_context *ctx,
    return GL_TRUE;
 }
 
+static void
+st_ClearTexSubImage(struct gl_context *ctx,
+                    struct gl_texture_image *texImage,
+                    GLint xoffset, GLint yoffset, GLint zoffset,
+                    GLsizei width, GLsizei height, GLsizei depth,
+                    const GLvoid *clearValue)
+{
+   static const char zeros[16] = {0};
+   struct st_texture_image *stImage = st_texture_image(texImage);
+   struct pipe_resource *pt = stImage->pt;
+   struct st_context *st = st_context(ctx);
+   struct pipe_context *pipe = st->pipe;
+   unsigned level = texImage->Level;
+   struct pipe_box box;
+
+   if (!pt)
+      return;
+
+   u_box_3d(xoffset, yoffset, zoffset + texImage->Face,
+            width, height, depth, &box);
+   if (texImage->TexObject->Immutable) {
+      level += texImage->TexObject->MinLevel;
+      box.z += texImage->TexObject->MinLayer;
+   }
+
+   pipe->clear_texture(pipe, pt, level, &box, clearValue ? clearValue : zeros);
+}
+
 void
 st_init_texture_functions(struct dd_function_table *functions)
 {
@@ -1904,4 +1932,5 @@ st_init_texture_functions(struct dd_function_table *functions)
 
    functions->AllocTextureStorage = st_AllocTextureStorage;
    functions->TextureView = st_TextureView;
+   functions->ClearTexSubImage = st_ClearTexSubImage;
 }
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index bbb9027..99e96e1 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -439,6 +439,7 @@ void st_init_extensions(struct pipe_screen *screen,
    static const struct st_extension_cap_mapping cap_mapping[] = {
       { o(ARB_base_instance),                PIPE_CAP_START_INSTANCE                   },
       { o(ARB_buffer_storage),               PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT   },
+      { o(ARB_clear_texture),                PIPE_CAP_CLEAR_TEXTURE                    },
       { o(ARB_color_buffer_float),           PIPE_CAP_VERTEX_COLOR_UNCLAMPED           },
       { o(ARB_copy_image),                   PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS },
       { o(ARB_depth_clamp),                  PIPE_CAP_DEPTH_CLIP_DISABLE               },