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191d915671
This adds a new function, cogl_framebuffer_get_color_format() to be able to query the common pixel format for any color buffers attached to a given CoglFramebuffer. For example an offscreen framebuffer created using cogl_offscreen_new_to_texture() would have a format matching the texture. Reviewed-by: Neil Roberts <neil@linux.intel.com>
535 lines
18 KiB
C
535 lines
18 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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#define cogl_framebuffer_swap_buffers cogl_framebuffer_swap_buffers_EXP
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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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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
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* window it requires that certain events be selected for via the core
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* X protocol. This requirement may also be changed asynchronously so
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* you must pass in an @update callback to inform you of Cogl's
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* required event mask.
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*
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* For example if you are using Xlib you could use this API roughly
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* as follows:
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* [{
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* static void
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* my_update_cogl_x11_event_mask (CoglOnscreen *onscreen,
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* guint32 event_mask,
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* void *user_data)
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* {
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* XSetWindowAttributes attrs;
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* MyData *data = user_data;
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* attrs.event_mask = event_mask | data->my_event_mask;
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* XChangeWindowAttributes (data->xdpy,
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* data->xwin,
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* CWEventMask,
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* &attrs);
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* }
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*
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* {
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* *snip*
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* cogl_x11_onscreen_set_foreign_window_xid (onscreen,
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* data->xwin,
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* my_update_cogl_x11_event_mask,
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* data);
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* *snip*
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* }
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* }]
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*
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* Since: 2.0
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* Stability: Unstable
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*/
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#define cogl_x11_onscreen_set_foreign_window_xid \
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cogl_x11_onscreen_set_foreign_window_xid_EXP
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void
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cogl_x11_onscreen_set_foreign_window_xid (CoglOnscreen *onscreen,
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guint32 xid,
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CoglOnscreenX11MaskCallback update,
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void *user_data);
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#define cogl_x11_onscreen_get_window_xid cogl_x11_onscreen_get_window_xid_EXP
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guint32
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cogl_x11_onscreen_get_window_xid (CoglOnscreen *onscreen);
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#define cogl_x11_onscreen_get_visual_xid cogl_x11_onscreen_get_visual_xid_EXP
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guint32
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cogl_x11_onscreen_get_visual_xid (CoglOnscreen *onscreen);
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#endif /* COGL_HAS_X11 */
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#ifdef COGL_HAS_WIN32_SUPPORT
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#define cogl_win32_onscreen_set_foreign_window \
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cogl_win32_onscreen_set_foreign_window_EXP
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void
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cogl_win32_onscreen_set_foreign_window (CoglOnscreen *onscreen,
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HWND hwnd);
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#define cogl_win32_onscreen_get_window cogl_win32_onscreen_get_window_EXP
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HWND
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cogl_win32_onscreen_get_window (CoglOnscreen *onscreen);
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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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struct wl_surface *
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cogl_wayland_onscreen_get_surface (CoglOnscreen *onscreen);
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#endif /* COGL_HAS_EGL_PLATFORM_WAYLAND_SUPPORT */
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#define cogl_onscreen_set_swap_throttled cogl_onscreen_set_swap_throttled_EXP
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void
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cogl_onscreen_set_swap_throttled (CoglOnscreen *onscreen,
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gboolean throttled);
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/**
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* cogl_onscreen_show:
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* @onscreen: The onscreen framebuffer to make visible
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*
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|
* 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 */
|
|
|