mutter/cogl/cogl-driver.h

/*
 * Cogl
 *
 * An object oriented GL/GLES Abstraction/Utility Layer
 *
 * Copyright (C) 2012 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, see <http://www.gnu.org/licenses/>.
 *
 *
 */

#ifndef __COGL_DRIVER_H
#define __COGL_DRIVER_H

#include "cogl-context.h"
#include "cogl-offscreen.h"
#include "cogl-framebuffer-private.h"
#include "cogl-attribute-private.h"

typedef struct _CoglDriverVtable CoglDriverVtable;

struct _CoglDriverVtable
{
  /* TODO: factor this out since this is OpenGL specific and
   * so can be ignored by non-OpenGL drivers. */
  CoglBool
  (* pixel_format_from_gl_internal) (CoglContext *context,
                                     GLenum gl_int_format,
                                     CoglPixelFormat *out_format);

  /* TODO: factor this out since this is OpenGL specific and
   * so can be ignored by non-OpenGL drivers. */
  CoglPixelFormat
  (* pixel_format_to_gl) (CoglContext *context,
                          CoglPixelFormat format,
                          GLenum *out_glintformat,
                          GLenum *out_glformat,
                          GLenum *out_gltype);

  CoglBool
  (* update_features) (CoglContext *context,
                       CoglError **error);

  CoglBool
  (* offscreen_allocate) (CoglOffscreen *offscreen,
                          CoglError **error);

  void
  (* offscreen_free) (CoglOffscreen *offscreen);

  void
  (* framebuffer_flush_state) (CoglFramebuffer *draw_buffer,
                               CoglFramebuffer *read_buffer,
                               CoglFramebufferState state);

  void
  (* framebuffer_clear) (CoglFramebuffer *framebuffer,
                         unsigned long buffers,
                         float red,
                         float green,
                         float blue,
                         float alpha);

  void
  (* framebuffer_query_bits) (CoglFramebuffer *framebuffer,
                              CoglFramebufferBits *bits);

  void
  (* framebuffer_finish) (CoglFramebuffer *framebuffer);

  void
  (* framebuffer_discard_buffers) (CoglFramebuffer *framebuffer,
                                   unsigned long buffers);

  void
  (* framebuffer_draw_attributes) (CoglFramebuffer *framebuffer,
                                   CoglPipeline *pipeline,
                                   CoglVerticesMode mode,
                                   int first_vertex,
                                   int n_vertices,
                                   CoglAttribute **attributes,
                                   int n_attributes,
                                   CoglDrawFlags flags);

  void
  (* framebuffer_draw_indexed_attributes) (CoglFramebuffer *framebuffer,
                                           CoglPipeline *pipeline,
                                           CoglVerticesMode mode,
                                           int first_vertex,
                                           int n_vertices,
                                           CoglIndices *indices,
                                           CoglAttribute **attributes,
                                           int n_attributes,
                                           CoglDrawFlags flags);

  CoglBool
  (* framebuffer_read_pixels_into_bitmap) (CoglFramebuffer *framebuffer,
                                           int x,
                                           int y,
                                           CoglReadPixelsFlags source,
                                           CoglBitmap *bitmap,
                                           CoglError **error);

  /* Destroys any driver specific resources associated with the given
   * 2D texture. */
  void
  (* texture_2d_free) (CoglTexture2D *tex_2d);

  /* Returns TRUE if the driver can support creating a 2D texture with
   * the given geometry and specified internal format.
   */
  CoglBool
  (* texture_2d_can_create) (CoglContext *ctx,
                             int width,
                             int height,
                             CoglPixelFormat internal_format);

  /* Initializes driver private state before allocating any specific
   * storage for a 2D texture, where base texture and texture 2D
   * members will already be initialized before passing control to
   * the driver.
   */
  void
  (* texture_2d_init) (CoglTexture2D *tex_2d);

  /* Allocates (uninitialized) storage for the given texture according
   * to the configured size and format of the texture */
  CoglBool
  (* texture_2d_allocate) (CoglTexture *tex,
                           CoglError **error);

  /* Initialize the specified region of storage of the given texture
   * with the contents of the specified framebuffer region
   */
  void
  (* texture_2d_copy_from_framebuffer) (CoglTexture2D *tex_2d,
                                        int src_x,
                                        int src_y,
                                        int width,
                                        int height,
                                        CoglFramebuffer *src_fb,
                                        int dst_x,
                                        int dst_y,
                                        int level);

  /* If the given texture has a corresponding OpenGL texture handle
   * then return that.
   *
   * This is optional
   */
  unsigned int
  (* texture_2d_get_gl_handle) (CoglTexture2D *tex_2d);

  /* Update all mipmap levels > 0 */
  void
  (* texture_2d_generate_mipmap) (CoglTexture2D *tex_2d);

  /* Initialize the specified region of storage of the given texture
   * with the contents of the specified bitmap region
   *
   * Since this may need to create the underlying storage first
   * it may throw a NO_MEMORY error.
   */
  CoglBool
  (* texture_2d_copy_from_bitmap) (CoglTexture2D *tex_2d,
                                   int src_x,
                                   int src_y,
                                   int width,
                                   int height,
                                   CoglBitmap *bitmap,
                                   int dst_x,
                                   int dst_y,
                                   int level,
                                   CoglError **error);

  /* Reads back the full contents of the given texture and write it to
   * @data in the given @format and with the given @rowstride.
   *
   * This is optional
   */
  void
  (* texture_2d_get_data) (CoglTexture2D *tex_2d,
                           CoglPixelFormat format,
                           int rowstride,
                           uint8_t *data);

  /* Prepares for drawing by flushing the journal, framebuffer state,
   * pipeline state and attribute state.
   */
  void
  (* flush_attributes_state) (CoglFramebuffer *framebuffer,
                              CoglPipeline *pipeline,
                              CoglFlushLayerState *layer_state,
                              CoglDrawFlags flags,
                              CoglAttribute **attributes,
                              int n_attributes);

  /* Flushes the clip stack to the GPU using a combination of the
   * stencil buffer, scissor and clip plane state.
   */
  void
  (* clip_stack_flush) (CoglClipStack *stack, CoglFramebuffer *framebuffer);

  /* Enables the driver to create some meta data to represent a buffer
   * but with no corresponding storage allocated yet.
   */
  void
  (* buffer_create) (CoglBuffer *buffer);

  void
  (* buffer_destroy) (CoglBuffer *buffer);

  /* Maps a buffer into the CPU */
  void *
  (* buffer_map_range) (CoglBuffer *buffer,
                        size_t offset,
                        size_t size,
                        CoglBufferAccess access,
                        CoglBufferMapHint hints,
                        CoglError **error);

  /* Unmaps a buffer */
  void
  (* buffer_unmap) (CoglBuffer *buffer);

  /* Uploads data to the buffer without needing to map it necessarily
   */
  CoglBool
  (* buffer_set_data) (CoglBuffer *buffer,
                       unsigned int offset,
                       const void *data,
                       unsigned int size,
                       CoglError **error);
};

#define COGL_DRIVER_ERROR (_cogl_driver_error_quark ())

typedef enum { /*< prefix=COGL_DRIVER_ERROR >*/
  COGL_DRIVER_ERROR_UNKNOWN_VERSION,
  COGL_DRIVER_ERROR_INVALID_VERSION,
  COGL_DRIVER_ERROR_NO_SUITABLE_DRIVER_FOUND,
  COGL_DRIVER_ERROR_FAILED_TO_LOAD_LIBRARY
} CoglDriverError;

uint32_t
_cogl_driver_error_quark (void);

#endif /* __COGL_DRIVER_H */