cde6a447b4
As they make more sense there. Maybe we could have a common OpenGLTextureDriver that would share the common texture_2d_* vfuncs but that can be done later. By moving those vfuncs to the TextureDriver, we can get rid of the texutre_2d nop driver implementations. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4163>
248 lines
11 KiB
C
248 lines
11 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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*/
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#pragma once
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#include <glib-object.h>
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#include "cogl/cogl-gl-header.h"
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#include "cogl/cogl-pixel-format.h"
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#include "cogl/cogl-types.h"
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G_DECLARE_DERIVABLE_TYPE (CoglTextureDriver,
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cogl_texture_driver,
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COGL,
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TEXTURE_DRIVER,
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GObject)
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#define COGL_TYPE_TEXTURE_DRIVER (cogl_texture_driver_get_type ())
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struct _CoglTextureDriverClass
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{
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GObjectClass parent_class;
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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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GLuint (* gen) (CoglTextureDriver *driver,
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CoglContext *ctx,
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GLenum gl_target,
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CoglPixelFormat internal_format);
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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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gboolean (* upload_subregion_to_gl) (CoglTextureDriver *driver,
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CoglContext *ctx,
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CoglTexture *texture,
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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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int level,
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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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GError **error);
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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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gboolean (* upload_to_gl) (CoglTextureDriver *driver,
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CoglContext *ctx,
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GLenum gl_target,
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GLuint gl_handle,
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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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GError **error);
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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 (* prep_gl_for_pixels_download) (CoglTextureDriver *driver,
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CoglContext *ctx,
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int image_width,
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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 (* gl_get_tex_image) (CoglTextureDriver *driver,
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CoglContext *ctx,
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GLenum gl_target,
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GLenum dest_gl_format,
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GLenum dest_gl_type,
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uint8_t *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 (* size_supported) (CoglTextureDriver *driver,
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CoglContext *ctx,
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GLenum gl_target,
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GLenum gl_intformat,
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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 (* format_supports_upload) (CoglTextureDriver *driver,
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CoglContext *ctx,
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CoglPixelFormat format);
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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 (* find_best_gl_get_data_format) (CoglTextureDriver *driver,
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CoglContext *context,
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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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/* Destroys any driver specific resources associated with the given
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* 2D texture. */
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void (* texture_2d_free) (CoglTextureDriver *driver,
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CoglTexture2D *tex_2d);
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/* Returns TRUE if the driver can support creating a 2D texture with
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* the given geometry and specified internal format.
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*/
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gboolean (* texture_2d_can_create) (CoglTextureDriver *driver,
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CoglContext *ctx,
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int width,
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int height,
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CoglPixelFormat internal_format);
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/* Initializes driver private state before allocating any specific
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* storage for a 2D texture, where base texture and texture 2D
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* members will already be initialized before passing control to
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* the driver.
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*/
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void (* texture_2d_init) (CoglTextureDriver *driver,
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CoglTexture2D *tex_2d);
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/* Allocates (uninitialized) storage for the given texture according
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* to the configured size and format of the texture */
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gboolean (* texture_2d_allocate) (CoglTextureDriver *driver,
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CoglTexture *tex,
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GError **error);
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/* Initialize the specified region of storage of the given texture
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* with the contents of the specified framebuffer region
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*/
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void (* texture_2d_copy_from_framebuffer) (CoglTextureDriver *driver,
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CoglTexture2D *tex_2d,
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int src_x,
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int src_y,
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int width,
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int height,
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CoglFramebuffer *src_fb,
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int dst_x,
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int dst_y,
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int level);
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/* If the given texture has a corresponding OpenGL texture handle
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* then return that.
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*
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* This is optional
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*/
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unsigned int (* texture_2d_get_gl_handle) (CoglTextureDriver *driver,
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CoglTexture2D *tex_2d);
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/* Update all mipmap levels > 0 */
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void (* texture_2d_generate_mipmap) (CoglTextureDriver *driver,
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CoglTexture2D *tex_2d);
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/* Initialize the specified region of storage of the given texture
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* with the contents of the specified bitmap region
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*
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* Since this may need to create the underlying storage first
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* it may throw a NO_MEMORY error.
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*/
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gboolean (* texture_2d_copy_from_bitmap) (CoglTextureDriver *driver,
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CoglTexture2D *tex_2d,
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int src_x,
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int src_y,
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int width,
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int height,
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CoglBitmap *bitmap,
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int dst_x,
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int dst_y,
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int level,
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GError **error);
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gboolean (* texture_2d_is_get_data_supported) (CoglTextureDriver *driver,
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CoglTexture2D *tex_2d);
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/* Reads back the full contents of the given texture and write it to
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* @data in the given @format and with the given @rowstride.
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*
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* This is optional
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*/
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void (* texture_2d_get_data) (CoglTextureDriver *driver,
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CoglTexture2D *tex_2d,
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CoglPixelFormat format,
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int rowstride,
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uint8_t *data);
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};
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