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63461c0f8b
This adds cogl_framebuffer_discard_buffers API that allows applications
to explicitly discard depth and stencil buffers which really helps when
using a tile based GPU architexture by potentially avoiding the need to
save the results of depth and stencil buffer changes to system memory
between frames since these can usually be handled directly with on-chip
memory instead.
The semantics for cogl_framebuffer_swap_buffers and
cogl_framebuffer_swap_region are now documented to include an implicit
discard of all buffers, including the color buffer.
We now recommend that all rendering to a CoglOffscreen framebuffer
should be followed by a call like:
cogl_framebuffer_discard_buffers (fb,
COGL_BUFFER_BIT_DEPTH|
COGL_BUFFER_BIT_STENCIL);
Reviewed-by: Neil Roberts <neil@linux.intel.com>
605 lines
21 KiB
C
605 lines
21 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2011 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifndef __COGL_FRAMEBUFFER_H
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#define __COGL_FRAMEBUFFER_H
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#include <glib.h>
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#ifdef COGL_HAS_WIN32_SUPPORT
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#include <windows.h>
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#endif /* COGL_HAS_WIN32_SUPPORT */
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#if defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
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#include <wayland-client.h>
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#endif /* COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT */
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-framebuffer
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* @short_description: A common interface for manipulating framebuffers
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*
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* Framebuffers are a collection of buffers that can be rendered too.
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* A framebuffer may be comprised of one or more color buffers, an
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* optional depth buffer and an optional stencil buffer. Other
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* configuration parameters are associated with framebuffers too such
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* as whether the framebuffer supports multi-sampling (an anti-aliasing
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* technique) or dithering.
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*
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* There are two kinds of framebuffer in Cogl, #CoglOnscreen
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* framebuffers and #CoglOffscreen framebuffers. As the names imply
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* offscreen framebuffers are for rendering something offscreen
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* (perhaps to a texture which is bound as one of the color buffers).
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* The exact semantics of onscreen framebuffers depends on the window
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* system backend that you are using, but typically you can expect
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* rendering to a #CoglOnscreen framebuffer will be immediately
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* visible to the user.
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*
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* If you want to create a new framebuffer then you should start by
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* looking at the #CoglOnscreen and #CoglOffscreen constructor
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* functions, such as cogl_offscreen_new_to_texture() or
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* cogl_onscreen_new(). The #CoglFramebuffer interface deals with
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* all aspects that are common between those two types of framebuffer.
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*
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* Setup of a new CoglFramebuffer happens in two stages. There is a
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* configuration stage where you specify all the options and ancillary
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* buffers you want associated with your framebuffer and then when you
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* are happy with the configuration you can "allocate" the framebuffer
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* using cogl_framebuffer_allocate (). Technically explicitly calling
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* cogl_framebuffer_allocate () is optional for convenience and the
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* framebuffer will automatically be allocated when you first try to
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* draw to it, but if you do the allocation manually then you can
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* also catch any possible errors that may arise from your
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* configuration.
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*/
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#ifdef COGL_ENABLE_EXPERIMENTAL_API
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#define cogl_onscreen_new cogl_onscreen_new_EXP
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#define COGL_FRAMEBUFFER(X) ((CoglFramebuffer *)(X))
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#define cogl_framebuffer_allocate cogl_framebuffer_allocate_EXP
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gboolean
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cogl_framebuffer_allocate (CoglFramebuffer *framebuffer,
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GError **error);
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#define cogl_framebuffer_get_width cogl_framebuffer_get_width_EXP
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int
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cogl_framebuffer_get_width (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_get_height cogl_framebuffer_get_height_EXP
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int
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cogl_framebuffer_get_height (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_set_viewport cogl_framebuffer_set_viewport_EXP
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void
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cogl_framebuffer_set_viewport (CoglFramebuffer *framebuffer,
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float x,
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float y,
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float width,
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float height);
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#define cogl_framebuffer_get_viewport_x cogl_framebuffer_get_viewport_x_EXP
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float
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cogl_framebuffer_get_viewport_x (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_get_viewport_y cogl_framebuffer_get_viewport_y_EXP
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float
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cogl_framebuffer_get_viewport_y (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_get_viewport_width cogl_framebuffer_get_viewport_width_EXP
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float
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cogl_framebuffer_get_viewport_width (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_get_viewport_height cogl_framebuffer_get_viewport_height_EXP
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float
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cogl_framebuffer_get_viewport_height (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_get_viewport4fv cogl_framebuffer_get_viewport4fv_EXP
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void
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cogl_framebuffer_get_viewport4fv (CoglFramebuffer *framebuffer,
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float *viewport);
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/**
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* cogl_framebuffer_get_red_bits:
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* @framebuffer: a pointer to a #CoglFramebuffer
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*
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* Retrieves the number of red bits of @framebuffer
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*
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* Return value: the number of bits
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*
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* Since: 1.8
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* Stability: unstable
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*/
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#define cogl_framebuffer_get_red_bits cogl_framebuffer_get_red_bits_EXP
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int
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cogl_framebuffer_get_red_bits (CoglFramebuffer *framebuffer);
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/**
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* cogl_framebuffer_get_green_bits:
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* @framebuffer: a pointer to a #CoglFramebuffer
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*
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* Retrieves the number of green bits of @framebuffer
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*
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* Return value: the number of bits
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*
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* Since: 1.8
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* Stability: unstable
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*/
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#define cogl_framebuffer_get_green_bits cogl_framebuffer_get_green_bits_EXP
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int
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cogl_framebuffer_get_green_bits (CoglFramebuffer *framebuffer);
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/**
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* cogl_framebuffer_get_blue_bits:
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* @framebuffer: a pointer to a #CoglFramebuffer
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*
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* Retrieves the number of blue bits of @framebuffer
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*
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* Return value: the number of bits
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*
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* Since: 1.8
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* Stability: unstable
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*/
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#define cogl_framebuffer_get_blue_bits cogl_framebuffer_get_blue_bits_EXP
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int
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cogl_framebuffer_get_blue_bits (CoglFramebuffer *framebuffer);
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/**
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* cogl_framebuffer_get_alpha_bits:
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* @framebuffer: a pointer to a #CoglFramebuffer
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*
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* Retrieves the number of alpha bits of @framebuffer
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*
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* Return value: the number of bits
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*
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* Since: 1.8
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* Stability: unstable
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*/
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#define cogl_framebuffer_get_alpha_bits cogl_framebuffer_get_alpha_bits_EXP
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int
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cogl_framebuffer_get_alpha_bits (CoglFramebuffer *framebuffer);
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/**
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* cogl_framebuffer_get_dither_enabled:
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* @framebuffer: a pointer to a #CoglFramebuffer
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*
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* Returns whether dithering has been requested for the given @framebuffer.
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* See cogl_framebuffer_set_dither_enabled() for more details about dithering.
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*
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* <note>This may return %TRUE even when the underlying @framebuffer
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* display pipeline does not support dithering. This value only represents
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* the user's request for dithering.</note>
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*
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* Return value: %TRUE if dithering has been requested or %FALSE if not.
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*/
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gboolean
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cogl_framebuffer_get_dither_enabled (CoglFramebuffer *framebuffer);
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/**
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* cogl_framebuffer_set_dither_enabled:
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* @framebuffer: a pointer to a #CoglFramebuffer
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* @dither_enabled: %TRUE to enable dithering or %FALSE to disable
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*
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* Enables or disabled dithering if supported by the hardware.
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*
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* Dithering is a hardware dependent technique to increase the visible
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* color resolution beyond what the underlying hardware supports by playing
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* tricks with the colors placed into the framebuffer to give the illusion
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* of other colors. (For example this can be compared to half-toning used
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* by some news papers to show varying levels of grey even though their may
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* only be black and white are available).
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*
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* If the current display pipeline for @framebuffer does not support dithering
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* then this has no affect.
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*
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* Dithering is enabled by default.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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void
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cogl_framebuffer_set_dither_enabled (CoglFramebuffer *framebuffer,
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gboolean dither_enabled);
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#define cogl_framebuffer_get_color_mask cogl_framebuffer_get_color_mask_EXP
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/**
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* cogl_framebuffer_get_color_mask:
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* @framebuffer: a pointer to a #CoglFramebuffer
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*
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* Gets the current #CoglColorMask of which channels would be written to the
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* current framebuffer. Each bit set in the mask means that the
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* corresponding color would be written.
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*
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* Returns: A #CoglColorMask
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* Since: 1.8
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* Stability: unstable
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*/
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CoglColorMask
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cogl_framebuffer_get_color_mask (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_set_color_mask cogl_framebuffer_set_color_mask_EXP
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/**
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* cogl_framebuffer_set_color_mask:
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* @framebuffer: a pointer to a #CoglFramebuffer
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* @color_mask: A #CoglColorMask of which color channels to write to
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* the current framebuffer.
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*
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* Defines a bit mask of which color channels should be written to the
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* given @framebuffer. If a bit is set in @color_mask that means that
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* color will be written.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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void
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cogl_framebuffer_set_color_mask (CoglFramebuffer *framebuffer,
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CoglColorMask color_mask);
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#define cogl_framebuffer_get_color_format cogl_framebuffer_get_color_format_EXP
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/**
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* cogl_framebuffer_get_color_format:
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* @framebuffer: A #CoglFramebuffer framebuffer
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*
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* Queries the common #CoglPixelFormat of all color buffers attached
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* to this framebuffer. For an offscreen framebuffer created with
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* cogl_offscreen_new_to_texture() this will correspond to the format
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* of the texture.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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CoglPixelFormat
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cogl_framebuffer_get_color_format (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_get_context cogl_framebuffer_get_context_EXP
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/**
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* @framebuffer: A #CoglFramebuffer
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*
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* Can be used to query the #CoglContext a given @framebuffer was
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* instantiated within. This is the #CoglContext that was passed to
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* cogl_onscreen_new() for example.
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*
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* Return value: The #CoglContext that the given @framebuffer was
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* instantiated within.
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* Since: 1.8
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* Stability: unstable
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*/
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CoglContext *
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cogl_framebuffer_get_context (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_clear cogl_framebuffer_clear_EXP
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/**
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* cogl_framebuffer_clear:
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* @framebuffer: A #CoglFramebuffer
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* @buffers: A mask of #CoglBufferBit<!-- -->'s identifying which auxiliary
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* buffers to clear
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* @color: The color to clear the color buffer too if specified in
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* @buffers.
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*
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* Clears all the auxiliary buffers identified in the @buffers mask, and if
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* that includes the color buffer then the specified @color is used.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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void
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cogl_framebuffer_clear (CoglFramebuffer *framebuffer,
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unsigned long buffers,
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const CoglColor *color);
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#define cogl_framebuffer_clear4f cogl_framebuffer_clear4f_EXP
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/**
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* cogl_framebuffer_clear4f:
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* @framebuffer: A #CoglFramebuffer
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* @buffers: A mask of #CoglBufferBit<!-- -->'s identifying which auxiliary
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* buffers to clear
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* @red: The red component of color to clear the color buffer too if
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* specified in @buffers.
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* @green: The green component of color to clear the color buffer too if
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* specified in @buffers.
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* @blue: The blue component of color to clear the color buffer too if
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* specified in @buffers.
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* @alpha: The alpha component of color to clear the color buffer too if
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* specified in @buffers.
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*
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* Clears all the auxiliary buffers identified in the @buffers mask, and if
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* that includes the color buffer then the specified @color is used.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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void
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cogl_framebuffer_clear4f (CoglFramebuffer *framebuffer,
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unsigned long buffers,
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float red,
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float green,
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float blue,
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float alpha);
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/* XXX: Should we take an n_buffers + buffer id array instead of using
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* the CoglBufferBits type which doesn't seem future proof? */
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#define cogl_framebuffer_discard_buffers cogl_framebuffer_discard_buffers_EXP
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/**
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* cogl_framebuffer_discard_buffers:
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* @framebuffer: A #CoglFramebuffer
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* @buffers: A #CoglBufferBit mask of which ancillary buffers you want
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* to discard.
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*
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* Declares that the specified @buffers no longer need to be referenced
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* by any further rendering commands. This can be an important
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* optimization to avoid subsequent frames of rendering depending on
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* the results of a previous frame.
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*
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* For example; some tile-based rendering GPUs are able to avoid allocating and
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* accessing system memory for the depth and stencil buffer so long as these
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* buffers are not required as input for subsequent frames and that can save a
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* significant amount of memory bandwidth used to save and restore their
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* contents to system memory between frames.
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*
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* It is currently considered an error to try and explicitly discard the color
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* buffer by passing %COGL_BUFFER_BIT_COLOR. This is because the color buffer is
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* already implicitly discard when you finish rendering to a #CoglOnscreen
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* framebuffer, and it's not meaningful to try and discard the color buffer of
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* a #CoglOffscreen framebuffer since they are single-buffered.
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*
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*
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* Since: 1.8
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* Stability: unstable
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*/
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void
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cogl_framebuffer_discard_buffers (CoglFramebuffer *framebuffer,
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unsigned long buffers);
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/* XXX: Actually should this be renamed too cogl_onscreen_swap_buffers()? */
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#define cogl_framebuffer_swap_buffers cogl_framebuffer_swap_buffers_EXP
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/**
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* cogl_framebuffer_swap_buffers:
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* @framebuffer: A #CoglFramebuffer
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*
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* Swaps the current back buffer being rendered too, to the front for display.
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*
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* This function also implicitly discards the contents of the color, depth and
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* stencil buffers as if cogl_framebuffer_discard_buffers() were used. The
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* significance of the discard is that you should not expect to be able to
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* start a new frame that incrementally builds on the contents of the previous
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* frame.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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void
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cogl_framebuffer_swap_buffers (CoglFramebuffer *framebuffer);
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#define cogl_framebuffer_swap_region cogl_framebuffer_swap_region_EXP
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/**
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* cogl_framebuffer_swap_region:
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* @framebuffer: A #CoglFramebuffer
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* @rectangles: An array of integer 4-tuples representing rectangles as
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* (x, y, width, height) tuples.
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* @n_rectangles: The number of 4-tuples to be read from @rectangles
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*
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* Swaps a region of the back buffer being rendered too, to the front for
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* display. @rectangles represents the region as array of @n_rectangles each
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* defined by 4 sequential (x, y, width, height) integers.
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*
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* This function also implicitly discards the contents of the color, depth and
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* stencil buffers as if cogl_framebuffer_discard_buffers() were used. The
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* significance of the discard is that you should not expect to be able to
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* start a new frame that incrementally builds on the contents of the previous
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* frame.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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void
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cogl_framebuffer_swap_region (CoglFramebuffer *framebuffer,
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const int *rectangles,
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int n_rectangles);
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typedef void (*CoglSwapBuffersNotify) (CoglFramebuffer *framebuffer,
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void *user_data);
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#define cogl_framebuffer_add_swap_buffers_callback \
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cogl_framebuffer_add_swap_buffers_callback_EXP
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unsigned int
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cogl_framebuffer_add_swap_buffers_callback (CoglFramebuffer *framebuffer,
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CoglSwapBuffersNotify callback,
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void *user_data);
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#define cogl_framebuffer_remove_swap_buffers_callback \
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cogl_framebuffer_remove_swap_buffers_callback_EXP
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void
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cogl_framebuffer_remove_swap_buffers_callback (CoglFramebuffer *framebuffer,
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unsigned int id);
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typedef struct _CoglOnscreen CoglOnscreen;
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#define COGL_ONSCREEN(X) ((CoglOnscreen *)(X))
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CoglOnscreen *
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cogl_onscreen_new (CoglContext *context, int width, int height);
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#ifdef COGL_HAS_X11
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typedef void (*CoglOnscreenX11MaskCallback) (CoglOnscreen *onscreen,
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guint32 event_mask,
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void *user_data);
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/**
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* cogl_x11_onscreen_set_foreign_window_xid:
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* @onscreen: The unallocated framebuffer to associated with an X
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* window.
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* @xid: The XID of an existing X window
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* @update: A callback that notifies of updates to what Cogl requires
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* to be in the core X protocol event mask.
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*
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* Ideally we would recommend that you let Cogl be responsible for
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* creating any X window required to back an onscreen framebuffer but
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* if you really need to target a window created manually this
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* function can be called before @onscreen has been allocated to set a
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* foreign XID for your existing X window.
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*
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* Since Cogl needs, for example, to track changes to the size of an X
|
|
* window it requires that certain events be selected for via the core
|
|
* X protocol. This requirement may also be changed asynchronously so
|
|
* you must pass in an @update callback to inform you of Cogl's
|
|
* required event mask.
|
|
*
|
|
* For example if you are using Xlib you could use this API roughly
|
|
* as follows:
|
|
* [{
|
|
* static void
|
|
* my_update_cogl_x11_event_mask (CoglOnscreen *onscreen,
|
|
* guint32 event_mask,
|
|
* void *user_data)
|
|
* {
|
|
* XSetWindowAttributes attrs;
|
|
* MyData *data = user_data;
|
|
* attrs.event_mask = event_mask | data->my_event_mask;
|
|
* XChangeWindowAttributes (data->xdpy,
|
|
* data->xwin,
|
|
* CWEventMask,
|
|
* &attrs);
|
|
* }
|
|
*
|
|
* {
|
|
* *snip*
|
|
* cogl_x11_onscreen_set_foreign_window_xid (onscreen,
|
|
* data->xwin,
|
|
* my_update_cogl_x11_event_mask,
|
|
* data);
|
|
* *snip*
|
|
* }
|
|
* }]
|
|
*
|
|
* Since: 2.0
|
|
* Stability: Unstable
|
|
*/
|
|
#define cogl_x11_onscreen_set_foreign_window_xid \
|
|
cogl_x11_onscreen_set_foreign_window_xid_EXP
|
|
void
|
|
cogl_x11_onscreen_set_foreign_window_xid (CoglOnscreen *onscreen,
|
|
guint32 xid,
|
|
CoglOnscreenX11MaskCallback update,
|
|
void *user_data);
|
|
|
|
#define cogl_x11_onscreen_get_window_xid cogl_x11_onscreen_get_window_xid_EXP
|
|
guint32
|
|
cogl_x11_onscreen_get_window_xid (CoglOnscreen *onscreen);
|
|
|
|
#define cogl_x11_onscreen_get_visual_xid cogl_x11_onscreen_get_visual_xid_EXP
|
|
guint32
|
|
cogl_x11_onscreen_get_visual_xid (CoglOnscreen *onscreen);
|
|
#endif /* COGL_HAS_X11 */
|
|
|
|
#ifdef COGL_HAS_WIN32_SUPPORT
|
|
#define cogl_win32_onscreen_set_foreign_window \
|
|
cogl_win32_onscreen_set_foreign_window_EXP
|
|
void
|
|
cogl_win32_onscreen_set_foreign_window (CoglOnscreen *onscreen,
|
|
HWND hwnd);
|
|
|
|
#define cogl_win32_onscreen_get_window cogl_win32_onscreen_get_window_EXP
|
|
HWND
|
|
cogl_win32_onscreen_get_window (CoglOnscreen *onscreen);
|
|
#endif /* COGL_HAS_WIN32_SUPPORT */
|
|
|
|
#if defined (COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT)
|
|
struct wl_surface *
|
|
cogl_wayland_onscreen_get_surface (CoglOnscreen *onscreen);
|
|
#endif /* COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT */
|
|
|
|
#define cogl_onscreen_set_swap_throttled cogl_onscreen_set_swap_throttled_EXP
|
|
void
|
|
cogl_onscreen_set_swap_throttled (CoglOnscreen *onscreen,
|
|
gboolean throttled);
|
|
|
|
/**
|
|
* cogl_onscreen_show:
|
|
* @onscreen: The onscreen framebuffer to make visible
|
|
*
|
|
* This requests to make @onscreen visible to the user.
|
|
*
|
|
* Actually the precise semantics of this function depend on the
|
|
* window system currently in use, and if you don't have a
|
|
* multi-windowining system this function may in-fact do nothing.
|
|
*
|
|
* This function will implicitly allocate the given @onscreen
|
|
* framebuffer before showing it if it hasn't already been allocated.
|
|
*
|
|
* <note>Since Cogl doesn't explicitly track the visibility status of
|
|
* onscreen framebuffers it wont try to avoid redundant window system
|
|
* requests e.g. to show an already visible window. This also means
|
|
* that it's acceptable to alternatively use native APIs to show and
|
|
* hide windows without confusing Cogl.</note>
|
|
*
|
|
* Since: 2.0
|
|
* Stability: Unstable
|
|
*/
|
|
#define cogl_onscreen_show cogl_onscreen_show_EXP
|
|
void
|
|
cogl_onscreen_show (CoglOnscreen *onscreen);
|
|
|
|
/**
|
|
* cogl_onscreen_hide:
|
|
* @onscreen: The onscreen framebuffer to make invisible
|
|
*
|
|
* This requests to make @onscreen invisible to the user.
|
|
*
|
|
* Actually the precise semantics of this function depend on the
|
|
* window system currently in use, and if you don't have a
|
|
* multi-windowining system this function may in-fact do nothing.
|
|
*
|
|
* This function does not implicitly allocate the given @onscreen
|
|
* framebuffer before hiding it.
|
|
*
|
|
* <note>Since Cogl doesn't explicitly track the visibility status of
|
|
* onscreen framebuffers it wont try to avoid redundant window system
|
|
* requests e.g. to show an already visible window. This also means
|
|
* that it's acceptable to alternatively use native APIs to show and
|
|
* hide windows without confusing Cogl.</note>
|
|
*
|
|
* Since: 2.0
|
|
* Stability: Unstable
|
|
*/
|
|
#define cogl_onscreen_hide cogl_onscreen_hide_EXP
|
|
void
|
|
cogl_onscreen_hide (CoglOnscreen *onscreen);
|
|
|
|
#define cogl_get_draw_framebuffer cogl_get_draw_framebuffer_EXP
|
|
CoglFramebuffer *
|
|
cogl_get_draw_framebuffer (void);
|
|
|
|
#endif /* COGL_ENABLE_EXPERIMENTAL_API */
|
|
|
|
G_END_DECLS
|
|
|
|
#endif /* __COGL_FRAMEBUFFER_H */
|
|
|