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glamor: Create FBOs for pixmaps.

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This commit is contained in:
Eric Anholt 2009-08-20 15:28:13 -07:00 • committed by Zhigang Gong
commit 519103565c
5 changed files with 148 additions and 93 deletions
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64
glamor/glamor.c
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@ -40,6 +40,8 @@
static int glamor_screen_private_key_index;
DevPrivateKey glamor_screen_private_key = &glamor_screen_private_key_index;
static int glamor_pixmap_private_key_index;
DevPrivateKey glamor_pixmap_private_key = &glamor_pixmap_private_key_index;
/**
* glamor_get_drawable_pixmap() returns a backing pixmap for a given drawable.
@ -63,9 +65,57 @@ glamor_get_drawable_pixmap(DrawablePtr drawable)
static PixmapPtr
glamor_create_pixmap(ScreenPtr screen, int w, int h, int depth,
unsigned int usage_hint)
unsigned int usage)
{
return fbCreatePixmap(screen, w, h, depth, usage_hint);
PixmapPtr pixmap;
glamor_pixmap_private *pixmap_priv;
GLenum format;
if (w > 32767 || h > 32767)
return NullPixmap;
pixmap = fbCreatePixmap (screen, 0, 0, depth, usage);
pixmap_priv = glamor_get_pixmap_private(pixmap);
if (w == 0 || h == 0)
return pixmap;
/* We should probably take advantage of ARB_fbo's allowance of GL_ALPHA.
* FBOs, which EXT_fbo forgot to do.
*/
switch (depth) {
case 24:
format = GL_RGB;
break;
default:
format = GL_RGBA;
break;
}
/* Create the texture used to store the pixmap's data. */
glGenTextures(1, &pixmap_priv->tex);
glBindTexture(GL_TEXTURE_2D, pixmap_priv->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, w, h, 0,
format, GL_UNSIGNED_BYTE, NULL);
/* Create a framebuffer object wrapping the texture so that we can render
* to it.
*/
glGenFramebuffersEXT(1, &pixmap_priv->fb);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, pixmap_priv->fb);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_2D,
pixmap_priv->tex,
0);
screen->ModifyPixmapHeader(pixmap, w, h, 0, 0,
(w * pixmap->drawable.bitsPerPixel + 7) / 8,
NULL);
return pixmap;
}
static Bool
@ -96,9 +146,19 @@ glamor_init(ScreenPtr screen)
return FALSE;
dixSetPrivate(&screen->devPrivates, glamor_screen_private_key, glamor_priv);
if (!dixRequestPrivate(glamor_pixmap_private_key,
sizeof(glamor_pixmap_private))) {
LogMessage(X_WARNING,
"glamor%d: Failed to allocate pixmap private\n",
screen->myNum);
}
glewInit();
if (!GLEW_EXT_framebuffer_object) {
ErrorF("GL_EXT_framebuffer_object required\n");
goto fail;
}
if (!GLEW_ARB_shader_objects) {
ErrorF("GL_ARB_shader_objects required\n");
goto fail;