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78 lines
3.3 KiB
78 lines
3.3 KiB
8 months ago
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From 04d921c2c1da571c8c61a4ca12a380bc3b9623fe Mon Sep 17 00:00:00 2001
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From: Pekka Paalanen <pekka.paalanen@collabora.com>
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Date: Mon, 6 May 2019 13:40:31 +0300
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Subject: [PATCH 03/12] cogl: Replace ANGLE with GLES3 and NV framebuffer_blit
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ANGLE extensions are only provided by Google's Almost Native Graphics Layer
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Engine (ANGLE) implementation. Therefore they do not seem too useful for
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Mutter.
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The reason to drop GL_ANGLE_framebuffer_blit support is that it has more
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limitations compared to the glBlitFramebuffer in GL_EXT_framebuffer_blit,
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GL_NV_framebuffer_bit, OpenGL 3.0 and OpenGL ES 3.0. Most importantly, the
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ANGLE version cannot flip the image while copying, which limits
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_cogl_blit_framebuffer to only off-screen <-> off-screen copies. Follow-up work
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will need off-screen <-> on-screen copies.
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Instead of adding yet more capability flags to Cogl, dropping ANGLE support
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seems appropriate.
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The NV extension is added to the list of glBlitFramebuffer providers because it
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provides the same support as ANGLE and more.
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Likewise OpenGL ES 3.0 is added to the list of glBlitFramebuffer providers
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because e.g. Mesa GLES implementation usually provides it and that makes it
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widely available, again surpassing the ANGLE supported features.
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Follow-up patches will lift some of the Cogl assumptions of what
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glBlitFramebuffer cannot do.
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https://gitlab.gnome.org/GNOME/mutter/merge_requests/615
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(cherry picked from commit 3e68c9e8faa78298039fa3583898f18550740812)
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---
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cogl/cogl/cogl-framebuffer-private.h | 3 +--
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cogl/cogl/gl-prototypes/cogl-all-functions.h | 5 +++--
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2 files changed, 4 insertions(+), 4 deletions(-)
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diff --git a/cogl/cogl/cogl-framebuffer-private.h b/cogl/cogl/cogl-framebuffer-private.h
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index de886b64f..3aab852c4 100644
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--- a/cogl/cogl/cogl-framebuffer-private.h
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+++ b/cogl/cogl/cogl-framebuffer-private.h
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@@ -387,8 +387,7 @@ _cogl_push_framebuffers (CoglFramebuffer *draw_buffer,
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* Note that this function differs a lot from the glBlitFramebuffer
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* function provided by the GL_EXT_framebuffer_blit extension. Notably
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* it doesn't support having different sizes for the source and
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- * destination rectangle. This isn't supported by the corresponding
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- * GL_ANGLE_framebuffer_blit extension on GLES2.0 and it doesn't seem
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+ * destination rectangle. This doesn't seem
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* like a particularly useful feature. If the application wanted to
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* scale the results it may make more sense to draw a primitive
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* instead.
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diff --git a/cogl/cogl/gl-prototypes/cogl-all-functions.h b/cogl/cogl/gl-prototypes/cogl-all-functions.h
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index 924ee349d..0af126059 100644
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--- a/cogl/cogl/gl-prototypes/cogl-all-functions.h
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+++ b/cogl/cogl/gl-prototypes/cogl-all-functions.h
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@@ -4,6 +4,7 @@
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2009, 2011 Intel Corporation.
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+ * Copyright (C) 2019 DisplayLink (UK) Ltd.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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@@ -132,8 +133,8 @@ COGL_EXT_END ()
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COGL_EXT_BEGIN (offscreen_blit, 3, 0,
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- 0, /* not in either GLES */
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- "EXT\0ANGLE\0",
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+ COGL_EXT_IN_GLES3,
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+ "EXT\0NV\0",
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"framebuffer_blit\0")
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COGL_EXT_FUNCTION (void, glBlitFramebuffer,
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(GLint srcX0,
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--
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2.21.0
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