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mutter-performance-source/cogl/cogl-texture-driver.h
Vladimir Nadvornik 65015a137e [cogl-texture] Split CoglTexture into an abstract class + CoglTexture2dSliced
cogl-texture-2d-sliced provides an implementation of CoglTexture and this
seperation lays the foundation for potentially supporting atlas textures,
pixmap textures (as in GLX_EXT_texture_from_pixmap) and fast-path
GL_TEXTURE_{1D,2D,3D,RECTANGLE} textures in a maintainable fashion.
2009-10-16 18:58:51 +01:00

169 lines
6.2 KiB
C

/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __COGL_TEXTURE_DRIVER_H
#define __COGL_TEXTURE_DRIVER_H
/*
* Basically just a wrapper around glBindTexture, but the GLES2 backend
* for example also wants to know about the internal format so it can
* identify when alpha only textures are bound.
*/
void
_cogl_texture_driver_bind (GLenum gl_target, GLuint gl_handle, GLenum gl_intformat);
/*
* This sets up the glPixelStore state for an upload to a destination with
* the same size, and with no offset.
*/
/* NB: GLES can't upload a sub region of pixel data from a larger source
* buffer which is why this interface is limited. The GL driver has a more
* flexible version of this function that is uses internally */
void
_cogl_texture_driver_prep_gl_for_pixels_upload (int pixels_rowstride,
int pixels_bpp);
/*
* This uploads a sub-region from source_bmp to a single GL texture handle (i.e
* a single CoglTexture slice)
*
* It also updates the array of tex->first_pixels[slice_index] if
* dst_{x,y} == 0
*
* The driver abstraction is in place because GLES doesn't support the pixel
* store options required to source from a subregion, so for GLES we have
* to manually create a transient source bitmap.
*
* XXX: sorry for the ridiculous number of arguments :-(
*/
void
_cogl_texture_driver_upload_subregion_to_gl (CoglTexture *tex,
int src_x,
int src_y,
int dst_x,
int dst_y,
int width,
int height,
CoglBitmap *source_bmp,
GLuint source_gl_format,
GLuint source_gl_type,
GLuint gl_handle);
/*
* This sets up the glPixelStore state for an download to a destination with
* the same size, and with no offset.
*/
/* NB: GLES can't download pixel data into a sub region of a larger destination
* buffer, the GL driver has a more flexible version of this function that it
* uses internally. */
void
_cogl_texture_driver_prep_gl_for_pixels_download (int pixels_rowstride,
int pixels_bpp);
/*
* This driver abstraction is in place because GLES doesn't have a sane way to
* download data from a texture so you litterally render the texture to the
* backbuffer, and retrive the data using glReadPixels :-(
*/
gboolean
_cogl_texture_driver_download_from_gl (CoglTexture *tex,
CoglBitmap *target_bmp,
GLuint target_gl_format,
GLuint target_gl_type);
/*
* This driver abstraction is needed because GLES doesn't support glGetTexImage
* (). On GLES this currently just returns FALSE which will lead to a generic
* fallback path being used that simply renders the texture and reads it back
* from the framebuffer. (See _cogl_texture_draw_and_read () )
*/
gboolean
_cogl_texture_driver_gl_get_tex_image (GLenum gl_target,
GLenum dest_gl_format,
GLenum dest_gl_type,
guint8 *dest);
/*
* It may depend on the driver as to what texture sizes are supported...
*/
gboolean
_cogl_texture_driver_size_supported (GLenum gl_target,
GLenum gl_format,
GLenum gl_type,
int width,
int height);
/*
* This driver abstraction is needed because GLES doesn't support setting
* a texture border color.
*/
void
_cogl_texture_driver_try_setting_gl_border_color (
GLuint gl_target,
const GLfloat *transparent_color);
/*
* XXX: this should live in cogl/{gl,gles}/cogl.c
*/
gboolean
_cogl_pixel_format_from_gl_internal (GLenum gl_int_format,
CoglPixelFormat *out_format);
/*
* XXX: this should live in cogl/{gl,gles}/cogl.c
*/
CoglPixelFormat
_cogl_pixel_format_to_gl (CoglPixelFormat format,
GLenum *out_glintformat,
GLenum *out_glformat,
GLenum *out_gltype);
/*
* It may depend on the driver as to what texture targets may be used when
* creating a foreign texture. E.g. OpenGL supports ARB_texture_rectangle
* but GLES doesn't
*/
gboolean
_cogl_texture_driver_allows_foreign_gl_target (GLenum gl_target);
/*
* glGenerateMipmap semantics may need to be emulated for some drivers. E.g. by
* enabling auto mipmap generation an re-loading a number of known texels.
*/
void
_cogl_texture_driver_gl_generate_mipmaps (GLenum texture_target);
/*
* The driver may impose constraints on what formats can be used to store
* texture data read from textures. For example GLES currently only supports
* RGBA_8888, and so we need to manually convert the data if the final
* destination has another format.
*/
CoglPixelFormat
_cogl_texture_driver_find_best_gl_get_data_format (
CoglPixelFormat format,
GLenum *closest_gl_format,
GLenum *closest_gl_type);
#endif /* __COGL_TEXTURE_DRIVER_H */