glamor: Create FBOs for pixmaps.

glamor/glamor.c

@@ -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;

glamor/glamor_core.c

@@ -42,17 +42,28 @@
 Bool
 glamor_set_destination_pixmap(PixmapPtr pixmap)
 {
+    glamor_pixmap_private *pixmap_priv = glamor_get_pixmap_private(pixmap);
+
+    if (pixmap_priv == NULL) {
+	ErrorF("no pixmap priv?");
+	return FALSE;
+    }
+
+    if (pixmap_priv->fb == 0) {
 	ScreenPtr screen = pixmap->drawable.pScreen;
 	PixmapPtr screen_pixmap = screen->GetScreenPixmap(screen);
 
 	if (pixmap != screen_pixmap) {
-	ErrorF("stubbed drawing to non-screen pixmap\n");
+	    ErrorF("No FBO\n");
 	    return FALSE;
 	}
+    }
+
+    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, pixmap_priv->fb);
 
     glViewport(0, 0,
-	       screen_pixmap->drawable.width,
+	       pixmap->drawable.width,
-	       screen_pixmap->drawable.height);
+	       pixmap->drawable.height);
 
     return TRUE;
 }
@@ -75,10 +86,18 @@ void
 glamor_set_transform_for_pixmap(PixmapPtr pixmap,
 				glamor_transform_uniforms *uniform_locations)
 {
+    ScreenPtr screen = pixmap->drawable.pScreen;
+    PixmapPtr screen_pixmap = screen->GetScreenPixmap(screen);
+
     glUniform1fARB(uniform_locations->x_bias, -pixmap->drawable.width / 2.0f);
     glUniform1fARB(uniform_locations->x_scale, 2.0f / pixmap->drawable.width);
     glUniform1fARB(uniform_locations->y_bias, -pixmap->drawable.height / 2.0f);
-    glUniform1fARB(uniform_locations->y_scale, -2.0f / pixmap->drawable.height);
+    if (pixmap == screen_pixmap)
+	glUniform1fARB(uniform_locations->y_scale,
+		       -2.0f / pixmap->drawable.height);
+    else
+	glUniform1fARB(uniform_locations->y_scale,
+		       2.0f / pixmap->drawable.height);
 }
 
 GLint
@@ -176,28 +195,14 @@ static void
 glamor_put_image(DrawablePtr drawable, GCPtr gc, int depth, int x, int y,
 		 int w, int h, int leftPad, int format, char *bits)
 {
-    ScreenPtr screen = drawable->pScreen;
-    PixmapPtr screen_pixmap = screen->GetScreenPixmap(screen);
-    PixmapPtr dest_pixmap = glamor_get_drawable_pixmap(drawable);
-
-    if (screen_pixmap != dest_pixmap) {
-	fbPutImage(drawable, gc, depth, x, y, w, h, leftPad, format, bits);
-    } else {
     ErrorF("stub put_image\n");
 }
-}
 
 static void
 glamor_set_spans(DrawablePtr drawable, GCPtr gc, char *src,
 		 DDXPointPtr points, int *widths, int n, int sorted)
 {
-    ScreenPtr screen = drawable->pScreen;
-    PixmapPtr screen_pixmap = screen->GetScreenPixmap(screen);
     PixmapPtr dest_pixmap = glamor_get_drawable_pixmap(drawable);
-
-    if (screen_pixmap != dest_pixmap) {
-	fbSetSpans(drawable, gc, src, points, widths, n, sorted);
-    } else {
     GLenum format, type;
     int i;
 
@@ -224,7 +229,6 @@ glamor_set_spans(DrawablePtr drawable, GCPtr gc, char *src,
 	src += PixmapBytePad(widths[i], drawable->depth);
     }
 }
-}
 
 /**
  * glamor_poly_lines() checks if it can accelerate the lines as a group of
@@ -235,9 +239,6 @@ static void
 glamor_poly_lines(DrawablePtr drawable, GCPtr gc, int mode, int n,
 		  DDXPointPtr points)
 {
-    ScreenPtr screen = drawable->pScreen;
-    PixmapPtr screen_pixmap = screen->GetScreenPixmap(screen);
-    PixmapPtr dest_pixmap = glamor_get_drawable_pixmap(drawable);
     xRectangle *rects;
     int x1, x2, y1, y2;
     int i;
@@ -245,9 +246,6 @@ glamor_poly_lines(DrawablePtr drawable, GCPtr gc, int mode, int n,
     /* Don't try to do wide lines or non-solid fill style. */
     if (gc->lineWidth != 0 || gc->lineStyle != LineSolid ||
 	gc->fillStyle != FillSolid) {
-	if (dest_pixmap != screen_pixmap)
-	    fbPolyLine(drawable, gc, mode, n, points);
-	else
 	ErrorF("stub poly_line\n");
 	return;
     }
@@ -267,9 +265,6 @@ glamor_poly_lines(DrawablePtr drawable, GCPtr gc, int mode, int n,
 
 	if (x1 != x2 && y1 != y2) {
 	    xfree(rects);
-	    if (dest_pixmap != screen_pixmap)
-		fbPolyLine(drawable, gc, mode, n, points);
-	    else
 	    ErrorF("stub poly_line\n");
 	    return;
 	}

glamor/glamor_fillspans.c

@@ -44,14 +44,6 @@ glamor_fill_spans(DrawablePtr drawable,
     int extentX1, extentX2, extentY1, extentY2;
     int fullX1, fullX2, fullY1;
     int partX1, partX2;
-    ScreenPtr screen = drawable->pScreen;
-    PixmapPtr screen_pixmap = screen->GetScreenPixmap(screen);
-    PixmapPtr dest_pixmap = glamor_get_drawable_pixmap(drawable);
-
-    if (dest_pixmap != screen_pixmap) {
-	fbFillSpans(drawable, gc, n, points, widths, sorted);
-	return;
-    }
 
     extents = REGION_EXTENTS(gc->pScreen, clip);
     extentX1 = extents->x1;

glamor/glamor_getspans.c

@@ -39,16 +39,10 @@ glamor_get_spans(DrawablePtr drawable,
 		 int count,
 		 char *dst)
 {
-    ScreenPtr screen = drawable->pScreen;
-    PixmapPtr screen_pixmap = screen->GetScreenPixmap(screen);
     PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
-
-    if (screen_pixmap != pixmap) {
-	fbGetSpans(drawable, wmax, points, widths, count, dst);
-	return;
-    } else {
     GLenum format, type;
     int i;
+
     switch (drawable->depth) {
     case 24:
     case 32:
@@ -59,8 +53,12 @@ glamor_get_spans(DrawablePtr drawable,
 	ErrorF("Unknown getspans depth %d\n", drawable->depth);
 	return;
     }
-	if (!glamor_set_destination_pixmap(pixmap))
+
+    if (!glamor_set_destination_pixmap(pixmap)) {
+	fbGetSpans(drawable, wmax, points, widths, count, dst);
 	return;
+    }
+
     for (i = 0; i < count; i++) {
 	glReadPixels(points[i].x - pixmap->screen_x,
 		     points[i].y - pixmap->screen_y,
@@ -71,4 +69,3 @@ glamor_get_spans(DrawablePtr drawable,
 	dst += PixmapBytePad(widths[i], drawable->depth);
     }
 }
-}

glamor/glamor_priv.h

@@ -50,13 +50,24 @@ typedef struct glamor_screen_private {
     glamor_transform_uniforms solid_transform;
 } glamor_screen_private;
 
+typedef struct glamor_pixmap_private {
+    GLuint tex;
+    GLuint fb;
+} glamor_pixmap_private;
+
 extern DevPrivateKey glamor_screen_private_key;
+extern DevPrivateKey glamor_pixmap_private_key;
 static inline glamor_screen_private *
 glamor_get_screen_private(ScreenPtr screen)
 {
     return (glamor_screen_private *)dixLookupPrivate(&screen->devPrivates,
 						     glamor_screen_private_key);
 }
+static inline glamor_pixmap_private *
+glamor_get_pixmap_private(PixmapPtr pixmap)
+{
+    return dixLookupPrivate(&pixmap->devPrivates, glamor_pixmap_private_key);
+}
 
 /* glamor.c */
 PixmapPtr glamor_get_drawable_pixmap(DrawablePtr drawable);