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[gl] Use filtering of GL_NEAREST to hint to TexImage not to alloc for mipmaps.

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Gl defaults to NEAREST_MIPMAP_LINEAR on new texture objects.
This should save space or bandwidth with DRI drivers, as they'll use the
parameter as a hint, and then not have to either fix up later or waste
space for unused mipmap levels.
This commit is contained in:
Eric Anholt 2009-05-10 10:17:27 -07:00
parent a438acd37c
commit 17b41fe7e3
1 changed files with 7 additions and 0 deletions
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7
src/cairo-gl-surface.c
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@ -383,6 +383,8 @@ cairo_gl_surface_create (cairo_gl_context_t *ctx,
/* Create the texture used to store the surface's data. */
glGenTextures (1, &surface->tex);
glBindTexture (GL_TEXTURE_2D, surface->tex);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D (GL_TEXTURE_2D, 0, format, width, height, 0,
format, GL_UNSIGNED_BYTE, NULL);
@ -955,6 +957,11 @@ _cairo_gl_pattern_image_texture_setup (cairo_gl_composite_operand_t *operand,
image_surface->depth) == 0);
glPixelStorei (GL_UNPACK_ROW_LENGTH,
image_surface->stride / (image_surface->depth / 8));
/* The filter will be correctly set up later, but for now we want to
* hint to glTexImage that we're not mipmapping.
*/
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D (GL_TEXTURE_2D, 0, internal_format,
image_surface->width, image_surface->height, 0,
format, type, image_surface->data);