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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.
170 lines
6.2 KiB
C
170 lines
6.2 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) 2007,2008,2009 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __COGL_TEXTURE_DRIVER_H
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#define __COGL_TEXTURE_DRIVER_H
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/*
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* Basically just a wrapper around glBindTexture, but the GLES2 backend
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* for example also wants to know about the internal format so it can
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* identify when alpha only textures are bound.
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*/
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void
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_cogl_texture_driver_bind (GLenum gl_target, GLuint gl_handle, GLenum gl_intformat);
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/*
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* This sets up the glPixelStore state for an upload to a destination with
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* the same size, and with no offset.
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*/
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/* NB: GLES can't upload a sub region of pixel data from a larger source
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* buffer which is why this interface is limited. The GL driver has a more
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* flexible version of this function that is uses internally */
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void
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_cogl_texture_driver_prep_gl_for_pixels_upload (int pixels_rowstride,
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int pixels_bpp);
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/*
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* This uploads a sub-region from source_bmp to a single GL texture handle (i.e
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* a single CoglTexture slice)
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*
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* It also updates the array of tex->first_pixels[slice_index] if
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* dst_{x,y} == 0
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*
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* The driver abstraction is in place because GLES doesn't support the pixel
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* store options required to source from a subregion, so for GLES we have
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* to manually create a transient source bitmap.
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*
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* XXX: sorry for the ridiculous number of arguments :-(
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*/
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void
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_cogl_texture_driver_upload_subregion_to_gl (CoglTexture *tex,
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int src_x,
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int src_y,
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int dst_x,
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int dst_y,
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int width,
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int height,
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CoglBitmap *source_bmp,
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GLuint source_gl_format,
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GLuint source_gl_type,
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GLuint gl_handle);
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/*
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* This sets up the glPixelStore state for an download to a destination with
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* the same size, and with no offset.
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*/
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/* NB: GLES can't download pixel data into a sub region of a larger destination
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* buffer, the GL driver has a more flexible version of this function that it
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* uses internally. */
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void
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_cogl_texture_driver_prep_gl_for_pixels_download (int pixels_rowstride,
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int pixels_bpp);
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/*
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* This driver abstraction is in place because GLES doesn't have a sane way to
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* download data from a texture so you litterally render the texture to the
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* backbuffer, and retrive the data using glReadPixels :-(
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*/
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gboolean
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_cogl_texture_driver_download_from_gl (CoglTexture *tex,
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CoglBitmap *target_bmp,
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GLuint target_gl_format,
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GLuint target_gl_type);
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/*
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* This driver abstraction is needed because GLES doesn't support glGetTexImage
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* (). On GLES this currently just returns FALSE which will lead to a generic
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* fallback path being used that simply renders the texture and reads it back
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* from the framebuffer. (See _cogl_texture_draw_and_read () )
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*/
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gboolean
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_cogl_texture_driver_gl_get_tex_image (GLenum gl_target,
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GLenum dest_gl_format,
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GLenum dest_gl_type,
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guint8 *dest);
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/*
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* It may depend on the driver as to what texture sizes are supported...
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*/
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gboolean
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_cogl_texture_driver_size_supported (GLenum gl_target,
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GLenum gl_format,
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GLenum gl_type,
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int width,
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int height);
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/*
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* This driver abstraction is needed because GLES doesn't support setting
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* a texture border color.
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*/
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void
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_cogl_texture_driver_try_setting_gl_border_color (
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GLuint gl_target,
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const GLfloat *transparent_color);
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/*
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* XXX: this should live in cogl/{gl,gles}/cogl.c
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*/
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gboolean
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_cogl_pixel_format_from_gl_internal (GLenum gl_int_format,
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CoglPixelFormat *out_format);
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/*
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* XXX: this should live in cogl/{gl,gles}/cogl.c
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*/
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CoglPixelFormat
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_cogl_pixel_format_to_gl (CoglPixelFormat format,
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GLenum *out_glintformat,
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GLenum *out_glformat,
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GLenum *out_gltype);
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/*
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* It may depend on the driver as to what texture targets may be used when
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* creating a foreign texture. E.g. OpenGL supports ARB_texture_rectangle
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* but GLES doesn't
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*/
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gboolean
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_cogl_texture_driver_allows_foreign_gl_target (GLenum gl_target);
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/*
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* glGenerateMipmap semantics may need to be emulated for some drivers. E.g. by
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* enabling auto mipmap generation an re-loading a number of known texels.
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*/
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void
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_cogl_texture_driver_gl_generate_mipmaps (GLenum texture_target);
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/*
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* The driver may impose constraints on what formats can be used to store
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* texture data read from textures. For example GLES currently only supports
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* RGBA_8888, and so we need to manually convert the data if the final
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* destination has another format.
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*/
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CoglPixelFormat
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_cogl_texture_driver_find_best_gl_get_data_format (
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CoglPixelFormat format,
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GLenum *closest_gl_format,
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GLenum *closest_gl_type);
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#endif /* __COGL_TEXTURE_DRIVER_H */
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