5f181973a6
The texture driver functions are now accessed through a vtable pointed to by a struct in the CoglContext so that eventually it will be possible to compile both the GL and GLES texture drivers into a single binary and then select between them at runtime.
209 lines
7.4 KiB
C
209 lines
7.4 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, see <http://www.gnu.org/licenses/>.
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*
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*
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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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typedef struct _CoglTextureDriver CoglTextureDriver;
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struct _CoglTextureDriver
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{
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/*
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* A very small wrapper around glGenTextures() that ensures we default to
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* non-mipmap filters when creating textures. This is to save some memory as
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* the driver will not allocate room for the mipmap tree.
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*/
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void
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(* gen) (GLenum gl_target,
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GLsizei n,
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GLuint *textures);
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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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(* 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
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* handle (i.e 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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(* upload_subregion_to_gl) (GLenum gl_target,
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GLuint gl_handle,
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gboolean is_foreign,
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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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/*
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* Replaces the contents of the GL texture with the entire bitmap. On
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* GL this just directly calls glTexImage2D, but under GLES it needs
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* to copy the bitmap if the rowstride is not a multiple of a possible
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* alignment value because there is no GL_UNPACK_ROW_LENGTH
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*/
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void
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(* upload_to_gl) (GLenum gl_target,
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GLuint gl_handle,
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gboolean is_foreign,
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CoglBitmap *source_bmp,
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GLint internal_gl_format,
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GLuint source_gl_format,
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GLuint source_gl_type);
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/*
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* Replaces the contents of the GL texture with the entire bitmap. The
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* width of the texture is inferred from the bitmap. The height and
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* depth of the texture is given directly. The 'image_height' (which
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* is the number of rows between images) is inferred by dividing the
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* height of the bitmap by the depth.
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*/
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void
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(* upload_to_gl_3d) (GLenum gl_target,
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GLuint gl_handle,
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gboolean is_foreign,
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GLint height,
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GLint depth,
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CoglBitmap *source_bmp,
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GLint internal_gl_format,
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GLuint source_gl_format,
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GLuint source_gl_type);
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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
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* destination buffer, the GL driver has a more flexible version of
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* this function that it uses internally. */
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void
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(* 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 needed because GLES doesn't support
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* glGetTexImage (). On GLES this currently just returns FALSE which
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* will lead to a generic fallback path being used that simply
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* renders the texture and reads it back from the framebuffer. (See
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* _cogl_texture_draw_and_read () )
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*/
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gboolean
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(* 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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(* 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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gboolean
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(* size_supported_3d) (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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int depth);
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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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(* 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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(* 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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(* 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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(* allows_foreign_gl_target) (GLenum gl_target);
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/*
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* glGenerateMipmap semantics may need to be emulated for some
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* drivers. E.g. by enabling auto mipmap generation an re-loading a
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* number of known texels.
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*/
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void
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(* 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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(* find_best_gl_get_data_format) (CoglPixelFormat format,
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GLenum *closest_gl_format,
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GLenum *closest_gl_type);
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};
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#endif /* __COGL_TEXTURE_DRIVER_H */
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