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
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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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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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width, height,
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NULL);
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}
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static void
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@ -364,61 +364,6 @@ 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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void
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_cogl_framebuffer_push_projection (CoglFramebuffer *framebuffer);
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@ -1341,26 +1341,38 @@ 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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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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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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g_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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g_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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@ -1418,6 +1430,8 @@ _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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return TRUE;
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}
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void
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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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@ -1797,6 +1798,69 @@ 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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G_END_DECLS
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#endif /* __COGL_FRAMEBUFFER_H */
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