Mesa (master): meta: Use NDC in decompress_texture_image

[Ian Romanick]

Module: Mesa
Branch: master
Commit: eb65d4b84d4c514bfa9114a56a08513efabbe030
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=eb65d4b84d4c514bfa9114a56a08513efabbe030

Author: Ian Romanick <ian.d.romanick at intel.com>
Date:   Fri Dec 13 14:12:09 2013 -0800

meta: Use NDC in decompress_texture_image

There is no need to use pixel coordinates, and using NDC directly will
simplify the GLSL paths.

Signed-off-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/mesa/drivers/common/meta.c |   17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/src/mesa/drivers/common/meta.c b/src/mesa/drivers/common/meta.c
index 3479eb1..1d870d2 100644
--- a/src/mesa/drivers/common/meta.c
+++ b/src/mesa/drivers/common/meta.c
@@ -4108,18 +4108,17 @@ decompress_texture_image(struct gl_context *ctx,
                         verts[3].tex);
 
    /* setup vertex positions */
-   verts[0].x = 0.0F;
-   verts[0].y = 0.0F;
-   verts[1].x = width;
-   verts[1].y = 0.0F;
-   verts[2].x = width;
-   verts[2].y = height;
-   verts[3].x = 0.0F;
-   verts[3].y = height;
+   verts[0].x = -1.0F;
+   verts[0].y = -1.0F;
+   verts[1].x =  1.0F;
+   verts[1].y = -1.0F;
+   verts[2].x =  1.0F;
+   verts[2].y =  1.0F;
+   verts[3].x = -1.0F;
+   verts[3].y =  1.0F;
 
    _mesa_MatrixMode(GL_PROJECTION);
    _mesa_LoadIdentity();
-   _mesa_Ortho(0.0, width, 0.0, height, -1.0, 1.0);
    _mesa_set_viewport(ctx, 0, 0, 0, width, height);
 
    /* upload new vertex data */