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gl: Use the appropriate formats when reading buffers on GLES

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We cannot use GL_BGRA and GL_UNSIGNED_INT_8_8_8_8_REV when reading back
from the frame buffer in the software fallback path, as they do not
exist on OpenGL ES.

This will make the slow path a bit slower, because of the implicit
format conversion.
This commit is contained in:
Emmanuele Bassi 2016-04-23 12:16:03 +01:00
parent 5b03cf175a
commit a942e96c8f
1 changed files with 25 additions and 2 deletions
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27
gdk/gdkgl.c
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@ -423,6 +423,9 @@ gdk_cairo_draw_from_gl (cairo_t *cr,
gdk_window_get_unscaled_size (impl_window, NULL, &unscaled_window_height);
/* We can use glDrawBuffer on OpenGL only; on GLES 2.0 we are already
* double buffered so we don't need it...
*/
if (!gdk_gl_context_get_use_es (paint_context))
glDrawBuffer (GL_BACK);
else
@ -431,6 +434,9 @@ gdk_cairo_draw_from_gl (cairo_t *cr,
gdk_gl_context_get_version (paint_context, &maj, &min);
/* ... but on GLES 3.0 we can use the vectorized glDrawBuffers
* call.
*/
if ((maj * 100 + min) >= 300)
{
static const GLenum buffers[] = { GL_BACK };
@ -626,6 +632,17 @@ gdk_cairo_draw_from_gl (cairo_t *cr,
else
{
/* Software fallback */
int major, minor, version;
gdk_gl_context_get_version (paint_context, &major, &minor);
version = major * 100 + minor;
/* TODO: Use glTexSubImage2D() and do a row-by-row copy to replace
* the GL_UNPACK_ROW_LENGTH support
*/
if (gdk_gl_context_get_use_es (paint_context) &&
!(version >= 300 || gdk_gl_context_has_unpack_subimage (paint_context)))
goto out;
/* TODO: avoid reading back non-required data due to dest clip */
image = cairo_surface_create_similar_image (cairo_get_target (cr),
@ -653,8 +670,13 @@ gdk_cairo_draw_from_gl (cairo_t *cr,
glPixelStorei (GL_PACK_ALIGNMENT, 4);
glPixelStorei (GL_PACK_ROW_LENGTH, cairo_image_surface_get_stride (image) / 4);
glReadPixels (x, y, width, height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
cairo_image_surface_get_data (image));
/* The implicit format conversion is going to make this path slower */
if (!gdk_gl_context_get_use_es (paint_context))
glReadPixels (x, y, width, height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
cairo_image_surface_get_data (image));
else
glReadPixels (x, y, width, height, GL_RGBA, GL_UNSIGNED_BYTE,
cairo_image_surface_get_data (image));
glPixelStorei (GL_PACK_ROW_LENGTH, 0);
@ -673,6 +695,7 @@ gdk_cairo_draw_from_gl (cairo_t *cr,
cairo_surface_destroy (image);
}
out:
if (clip_region)
cairo_region_destroy (clip_region);