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