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mutter/0007-cogl-Expose-cogl_blit_framebuffer.patch

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From be13d3c844a6623563ae4e74dbb3409baf16fc9c Mon Sep 17 00:00:00 2001
From: Pekka Paalanen <pekka.paalanen@collabora.com>
Date: Mon, 3 Dec 2018 14:34:41 +0200
Subject: [PATCH 07/12] cogl: Expose cogl_blit_framebuffer
The function will be used in copying from a primary GPU framebuffer to a
secondary GPU framebuffer using the primary GPU specifically when the
secondary GPU is not render-capable.
To allow falling back in case glBlitFramebuffer cannot be used, add boolean
return value, and GError argument for debugging purposes.
https://gitlab.gnome.org/GNOME/mutter/merge_requests/615
(cherry picked from commit 6061abbf90cd1d62e262ebf3636470d2219e04a7)
---
cogl/cogl/cogl-blit.c | 11 ++---
cogl/cogl/cogl-framebuffer-private.h | 55 -----------------------
cogl/cogl/cogl-framebuffer.c | 40 +++++++++++------
cogl/cogl/cogl-framebuffer.h | 66 +++++++++++++++++++++++++++-
4 files changed, 98 insertions(+), 74 deletions(-)
diff --git a/cogl/cogl/cogl-blit.c b/cogl/cogl/cogl-blit.c
index c561b2e45..ae5a8a345 100644
--- a/cogl/cogl/cogl-blit.c
+++ b/cogl/cogl/cogl-blit.c
@@ -207,11 +207,12 @@ _cogl_blit_framebuffer_blit (CoglBlitData *data,
int width,
int height)
{
- _cogl_blit_framebuffer (data->src_fb,
- data->dest_fb,
- src_x, src_y,
- dst_x, dst_y,
- width, height);
+ cogl_blit_framebuffer (data->src_fb,
+ data->dest_fb,
+ src_x, src_y,
+ dst_x, dst_y,
+ width, height,
+ NULL);
}
static void
diff --git a/cogl/cogl/cogl-framebuffer-private.h b/cogl/cogl/cogl-framebuffer-private.h
index cb1f87354..7d71fb1dc 100644
--- a/cogl/cogl/cogl-framebuffer-private.h
+++ b/cogl/cogl/cogl-framebuffer-private.h
@@ -367,61 +367,6 @@ void
_cogl_push_framebuffers (CoglFramebuffer *draw_buffer,
CoglFramebuffer *read_buffer);
-/*
- * _cogl_blit_framebuffer:
- * @src: The source #CoglFramebuffer
- * @dest: The destination #CoglFramebuffer
- * @src_x: Source x position
- * @src_y: Source y position
- * @dst_x: Destination x position
- * @dst_y: Destination y position
- * @width: Width of region to copy
- * @height: Height of region to copy
- *
- * This blits a region of the color buffer of the source buffer
- * to the destination buffer. This function should only be
- * called if the COGL_PRIVATE_FEATURE_BLIT_FRAMEBUFFER feature is
- * advertised.
- *
- * The source and destination rectangles are defined in offscreen
- * framebuffer orientation. When copying between an offscreen and
- * onscreen framebuffers, the image is y-flipped accordingly.
- *
- * The two buffers must have the same value types (e.g. floating-point,
- * unsigned int, signed int, or fixed-point), but color formats do not
- * need to match. This limitation comes from OpenGL ES 3.0 definition
- * of glBlitFramebuffer.
- *
- * Note that this function differs a lot from the glBlitFramebuffer
- * function provided by the GL_EXT_framebuffer_blit extension. Notably
- * it doesn't support having different sizes for the source and
- * destination rectangle. This doesn't seem
- * like a particularly useful feature. If the application wanted to
- * scale the results it may make more sense to draw a primitive
- * instead.
- *
- * The GL function is documented to be affected by the scissor. This
- * function therefore ensure that an empty clip stack is flushed
- * before performing the blit which means the scissor is effectively
- * ignored.
- *
- * The function also doesn't support specifying the buffers to copy
- * and instead only the color buffer is copied. When copying the depth
- * or stencil buffers the extension on GLES2.0 only supports copying
- * the full buffer which would be awkward to document with this
- * API. If we wanted to support that feature it may be better to have
- * a separate function to copy the entire buffer for a given mask.
- */
-void
-_cogl_blit_framebuffer (CoglFramebuffer *src,
- CoglFramebuffer *dest,
- int src_x,
- int src_y,
- int dst_x,
- int dst_y,
- int width,
- int height);
-
void
_cogl_framebuffer_push_projection (CoglFramebuffer *framebuffer);
diff --git a/cogl/cogl/cogl-framebuffer.c b/cogl/cogl/cogl-framebuffer.c
index 5cc4eada4..6d35c6b13 100644
--- a/cogl/cogl/cogl-framebuffer.c
+++ b/cogl/cogl/cogl-framebuffer.c
@@ -1449,26 +1449,38 @@ cogl_framebuffer_read_pixels (CoglFramebuffer *framebuffer,
return ret;
}
-void
-_cogl_blit_framebuffer (CoglFramebuffer *src,
- CoglFramebuffer *dest,
- int src_x,
- int src_y,
- int dst_x,
- int dst_y,
- int width,
- int height)
+gboolean
+cogl_blit_framebuffer (CoglFramebuffer *src,
+ CoglFramebuffer *dest,
+ int src_x,
+ int src_y,
+ int dst_x,
+ int dst_y,
+ int width,
+ int height,
+ GError **error)
{
CoglContext *ctx = src->context;
int src_x1, src_y1, src_x2, src_y2;
int dst_x1, dst_y1, dst_x2, dst_y2;
- _COGL_RETURN_IF_FAIL (_cogl_has_private_feature
- (ctx, COGL_PRIVATE_FEATURE_BLIT_FRAMEBUFFER));
+ if (!_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_BLIT_FRAMEBUFFER))
+ {
+ g_set_error_literal (error, COGL_SYSTEM_ERROR,
+ COGL_SYSTEM_ERROR_UNSUPPORTED,
+ "Cogl BLIT_FRAMEBUFFER is not supported by the system.");
+ return FALSE;
+ }
/* The buffers must use the same premult convention */
- _COGL_RETURN_IF_FAIL ((src->internal_format & COGL_PREMULT_BIT) ==
- (dest->internal_format & COGL_PREMULT_BIT));
+ if ((src->internal_format & COGL_PREMULT_BIT) !=
+ (dest->internal_format & COGL_PREMULT_BIT))
+ {
+ g_set_error_literal (error, COGL_SYSTEM_ERROR,
+ COGL_SYSTEM_ERROR_UNSUPPORTED,
+ "cogl_blit_framebuffer premult mismatch.");
+ return FALSE;
+ }
/* Make sure the current framebuffers are bound. We explicitly avoid
flushing the clip state so we can bind our own empty state */
@@ -1526,6 +1538,8 @@ _cogl_blit_framebuffer (CoglFramebuffer *src,
dst_x1, dst_y1, dst_x2, dst_y2,
GL_COLOR_BUFFER_BIT,
GL_NEAREST);
+
+ return TRUE;
}
void
diff --git a/cogl/cogl/cogl-framebuffer.h b/cogl/cogl/cogl-framebuffer.h
index 48a77e1ed..230a78627 100644
--- a/cogl/cogl/cogl-framebuffer.h
+++ b/cogl/cogl/cogl-framebuffer.h
@@ -3,7 +3,8 @@
*
* A Low Level GPU Graphics and Utilities API
*
- * Copyright (C) 2011 Intel Corporation.
+ * Copyright (C) 2007,2008,2009,2011 Intel Corporation.
+ * Copyright (C) 2019 DisplayLink (UK) Ltd.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
@@ -1846,6 +1847,69 @@ typedef enum /*< prefix=COGL_FRAMEBUFFER_ERROR >*/
gboolean
cogl_is_framebuffer (void *object);
+/**
+ * cogl_blit_framebuffer:
+ * @src: The source #CoglFramebuffer
+ * @dest: The destination #CoglFramebuffer
+ * @src_x: Source x position
+ * @src_y: Source y position
+ * @dst_x: Destination x position
+ * @dst_y: Destination y position
+ * @width: Width of region to copy
+ * @height: Height of region to copy
+ * @error: optional error object
+ *
+ * @return FALSE for an immediately detected error, TRUE otherwise.
+ *
+ * This blits a region of the color buffer of the source buffer
+ * to the destination buffer. This function should only be
+ * called if the COGL_PRIVATE_FEATURE_BLIT_FRAMEBUFFER feature is
+ * advertised.
+ *
+ * The source and destination rectangles are defined in offscreen
+ * framebuffer orientation. When copying between an offscreen and
+ * onscreen framebuffers, the image is y-flipped accordingly.
+ *
+ * The two buffers must have the same value types (e.g. floating-point,
+ * unsigned int, signed int, or fixed-point), but color formats do not
+ * need to match. This limitation comes from OpenGL ES 3.0 definition
+ * of glBlitFramebuffer.
+ *
+ * Note that this function differs a lot from the glBlitFramebuffer
+ * function provided by the GL_EXT_framebuffer_blit extension. Notably
+ * it doesn't support having different sizes for the source and
+ * destination rectangle. This doesn't seem
+ * like a particularly useful feature. If the application wanted to
+ * scale the results it may make more sense to draw a primitive
+ * instead.
+ *
+ * The GL function is documented to be affected by the scissor. This
+ * function therefore ensure that an empty clip stack is flushed
+ * before performing the blit which means the scissor is effectively
+ * ignored.
+ *
+ * The function also doesn't support specifying the buffers to copy
+ * and instead only the color buffer is copied. When copying the depth
+ * or stencil buffers the extension on GLES2.0 only supports copying
+ * the full buffer which would be awkward to document with this
+ * API. If we wanted to support that feature it may be better to have
+ * a separate function to copy the entire buffer for a given mask.
+ *
+ * The @c error argument is optional, it can be NULL. If it is not NULL
+ * and this function returns FALSE, an error object with a code from
+ * COGL_SYSTEM_ERROR will be created.
+ */
+gboolean
+cogl_blit_framebuffer (CoglFramebuffer *src,
+ CoglFramebuffer *dest,
+ int src_x,
+ int src_y,
+ int dst_x,
+ int dst_y,
+ int width,
+ int height,
+ GError **error);
+
G_END_DECLS
#endif /* __COGL_FRAMEBUFFER_H */
--
2.21.0
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