/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*/
#ifndef __COGL_FRAMEBUFFER_DEPRECATED_H__
#define __COGL_FRAMEBUFFER_DEPRECATED_H__
#include <cogl/cogl-macros.h>
COGL_BEGIN_DECLS
/**
* cogl_set_framebuffer:
* @buffer: A #CoglFramebuffer object, either onscreen or offscreen.
*
* This redirects all subsequent drawing to the specified framebuffer. This can
* either be an offscreen buffer created with cogl_offscreen_new_to_texture ()
* or in the future it may be an onscreen framebuffers too.
*
* Since: 1.2
* Deprecated: 1.16: The latest drawing apis take explicit
* #CoglFramebuffer arguments so this stack of
* framebuffers shouldn't be used anymore.
*/
COGL_DEPRECATED_IN_1_16
void
cogl_set_framebuffer (CoglFramebuffer *buffer);
/**
* cogl_push_framebuffer:
* @buffer: A #CoglFramebuffer object, either onscreen or offscreen.
*
* Redirects all subsequent drawing to the specified framebuffer. This can
* either be an offscreen buffer created with cogl_offscreen_new_to_texture ()
* or in the future it may be an onscreen framebuffer too.
*
* You should understand that a framebuffer owns the following state:
* <itemizedlist>
* <listitem><simpara>The projection matrix</simpara></listitem>
* <listitem><simpara>The modelview matrix stack</simpara></listitem>
* <listitem><simpara>The viewport</simpara></listitem>
* <listitem><simpara>The clip stack</simpara></listitem>
* </itemizedlist>
* So these items will automatically be saved and restored when you
* push and pop between different framebuffers.
*
* Also remember a newly allocated framebuffer will have an identity matrix for
* the projection and modelview matrices which gives you a coordinate space
* like OpenGL with (-1, -1) corresponding to the top left of the viewport,
* (1, 1) corresponding to the bottom right and +z coming out towards the
* viewer.
*
* If you want to set up a coordinate space like Clutter does with (0, 0)
* corresponding to the top left and (framebuffer_width, framebuffer_height)
* corresponding to the bottom right you can do so like this:
*
* |[
* static void
* setup_viewport (unsigned int width,
* unsigned int height,
* float fovy,
* float aspect,
* float z_near,
* float z_far)
* {
* float z_camera;
* CoglMatrix projection_matrix;
* CoglMatrix mv_matrix;
*
* cogl_set_viewport (0, 0, width, height);
* cogl_perspective (fovy, aspect, z_near, z_far);
*
* cogl_get_projection_matrix (&projection_matrix);
* z_camera = 0.5 * projection_matrix.xx;
*
* cogl_matrix_init_identity (&mv_matrix);
* cogl_matrix_translate (&mv_matrix, -0.5f, -0.5f, -z_camera);
* cogl_matrix_scale (&mv_matrix, 1.0f / width, -1.0f / height, 1.0f / width);
* cogl_matrix_translate (&mv_matrix, 0.0f, -1.0 * height, 0.0f);
* cogl_set_modelview_matrix (&mv_matrix);
* }
*
* static void
* my_init_framebuffer (ClutterStage *stage,
* CoglFramebuffer *framebuffer,
* unsigned int framebuffer_width,
* unsigned int framebuffer_height)
* {
* ClutterPerspective perspective;
*
* clutter_stage_get_perspective (stage, &perspective);
*
* cogl_push_framebuffer (framebuffer);
* setup_viewport (framebuffer_width,
* framebuffer_height,
* perspective.fovy,
* perspective.aspect,
* perspective.z_near,
* perspective.z_far);
* }
* ]|
*
* The previous framebuffer can be restored by calling cogl_pop_framebuffer()
*
* Since: 1.2
* Deprecated: 1.16: The latest drawing apis take explicit
* #CoglFramebuffer arguments so this stack of
* framebuffers shouldn't be used anymore.
*/
COGL_DEPRECATED_IN_1_16
void
cogl_push_framebuffer (CoglFramebuffer *buffer);
/**
* cogl_pop_framebuffer:
*
* Restores the framebuffer that was previously at the top of the stack.
* All subsequent drawing will be redirected to this framebuffer.
*
* Since: 1.2
* Deprecated: 1.16: The latest drawing apis take explicit
* #CoglFramebuffer arguments so this stack of
* framebuffers shouldn't be used anymore.
*/
COGL_DEPRECATED_IN_1_16
void
cogl_pop_framebuffer (void);
/**
* cogl_set_draw_buffer:
* @target: A #CoglBufferTarget that specifies what kind of framebuffer you
* are setting as the render target.
* @offscreen: If you are setting a framebuffer of type COGL_OFFSCREEN_BUFFER
* then this is a CoglHandle for the offscreen buffer.
*
* Redirects all subsequent drawing to the specified framebuffer. This
* can either be an offscreen buffer created with
* cogl_offscreen_new_to_texture () or you can revert to your original
* on screen window buffer.
*
* Deprecated: 1.16: The latest drawing apis take explicit
* #CoglFramebuffer arguments so this stack of
* framebuffers shouldn't be used anymore.
*/
COGL_DEPRECATED_IN_1_16
void
cogl_set_draw_buffer (CoglBufferTarget target,
CoglHandle offscreen);
/**
* cogl_push_draw_buffer:
*
* Save cogl_set_draw_buffer() state.
*
* Deprecated: 1.16: The latest drawing apis take explicit
* #CoglFramebuffer arguments so this stack of
* framebuffers shouldn't be used anymore.
*/
COGL_DEPRECATED_IN_1_16
void
cogl_push_draw_buffer (void);
/**
* cogl_pop_draw_buffer:
*
* Restore cogl_set_draw_buffer() state.
*
* Deprecated: 1.16: The latest drawing apis take explicit
* #CoglFramebuffer arguments so this stack of
* framebuffers shouldn't be used anymore.
*/
COGL_DEPRECATED_IN_1_16
void
cogl_pop_draw_buffer (void);
/**
* cogl_read_pixels:
* @x: The window x position to start reading from
* @y: The window y position to start reading from
* @width: The width of the rectangle you want to read
* @height: The height of the rectangle you want to read
* @source: Identifies which auxillary buffer you want to read
* (only COGL_READ_PIXELS_COLOR_BUFFER supported currently)
* @format: The pixel format you want the result in
* (only COGL_PIXEL_FORMAT_RGBA_8888 supported currently)
* @pixels: The location to write the pixel data.
*
* This reads a rectangle of pixels from the current framebuffer where
* position (0, 0) is the top left. The pixel at (x, y) is the first
* read, and the data is returned with a rowstride of (width * 4).
*
* Currently Cogl assumes that the framebuffer is in a premultiplied
* format so if @format is non-premultiplied it will convert it. To
* read the pixel values without any conversion you should either
* specify a format that doesn't use an alpha channel or use one of
* the formats ending in PRE.
*
* Deprecated: 1.16: Use cogl_framebuffer_read_pixels() instead
*/
COGL_DEPRECATED_IN_1_16_FOR (cogl_framebuffer_read_pixels)
void
cogl_read_pixels (int x,
int y,
int width,
int height,
CoglReadPixelsFlags source,
CoglPixelFormat format,
uint8_t *pixels);
/* XXX: Since this api was marked unstable, maybe we can just
* remove this api if we can't find anyone is using it. */
/**
* cogl_framebuffer_get_color_format:
* @framebuffer: A #CoglFramebuffer framebuffer
*
* Queries the common #CoglPixelFormat of all color buffers attached
* to this framebuffer. For an offscreen framebuffer created with
* cogl_offscreen_new_with_texture() this will correspond to the format
* of the texture.
*
* This API is deprecated because it is missleading to report a
* #CoglPixelFormat for the internal format of the @framebuffer since
* #CoglPixelFormat is such a precise format description and it's
* only the set of components and the premultiplied alpha status
* that is really known.
*
* Since: 1.8
* Stability: unstable
* Deprecated 1.18: Removed since it is misleading
*/
COGL_DEPRECATED_IN_1_18
CoglPixelFormat
cogl_framebuffer_get_color_format (CoglFramebuffer *framebuffer);
COGL_END_DECLS
#endif /* __COGL_FRAMEBUFFER_DEPRECATED_H__ */