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https://github.com/brl/mutter.git
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ec03357e88
This adds a buffer method to map a subregion of the buffer. This works using the GL_ARB_map_buffer_range extension. If the extension is not available then it will fallback to using glMapBuffer to map the entire buffer and then just add the offset to the returned pointer. cogl_buffer_map() is now just a wrapper which maps the entire range of the buffer. The driver backend functions have been renamed to map_range and they now all take the offset and size arguments. When the COGL_BUFFER_MAP_HINT_DISCARD hint is used and the map range extension is available instead of using glBufferData to invalidate the buffer it will instead pass the new GL_MAP_HINT_INVALIDATE_BUFFER flag. There is now additionally a COGL_BUFFER_MAP_HINT_DISCARD_REGION hint which can be used if the application only wants to discard the small region that is mapped. glMapBufferRange is always used if it is available even if the entire buffer is being mapped because it seems more robust to pass those flags then to call glBufferData. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 55ca02b5ca9cafc750251ec974e0d6a536cb80b8)
264 lines
9.1 KiB
C
264 lines
9.1 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) 2012 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_DRIVER_H
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#define __COGL_DRIVER_H
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#include "cogl-context.h"
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#include "cogl-offscreen.h"
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#include "cogl-framebuffer-private.h"
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#include "cogl-attribute-private.h"
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typedef struct _CoglDriverVtable CoglDriverVtable;
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struct _CoglDriverVtable
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{
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/* TODO: factor this out since this is OpenGL specific and
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* so can be ignored by non-OpenGL drivers. */
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CoglBool
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(* pixel_format_from_gl_internal) (CoglContext *context,
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GLenum gl_int_format,
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CoglPixelFormat *out_format);
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/* TODO: factor this out since this is OpenGL specific and
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* so can be ignored by non-OpenGL drivers. */
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CoglPixelFormat
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(* pixel_format_to_gl) (CoglContext *context,
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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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CoglBool
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(* update_features) (CoglContext *context,
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CoglError **error);
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CoglBool
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(* offscreen_allocate) (CoglOffscreen *offscreen,
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CoglError **error);
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void
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(* offscreen_free) (CoglOffscreen *offscreen);
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void
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(* framebuffer_flush_state) (CoglFramebuffer *draw_buffer,
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CoglFramebuffer *read_buffer,
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CoglFramebufferState state);
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void
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(* framebuffer_clear) (CoglFramebuffer *framebuffer,
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unsigned long buffers,
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float red,
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float green,
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float blue,
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float alpha);
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void
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(* framebuffer_query_bits) (CoglFramebuffer *framebuffer,
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int *red,
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int *green,
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int *blue,
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int *alpha);
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void
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(* framebuffer_finish) (CoglFramebuffer *framebuffer);
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void
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(* framebuffer_discard_buffers) (CoglFramebuffer *framebuffer,
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unsigned long buffers);
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void
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(* framebuffer_draw_attributes) (CoglFramebuffer *framebuffer,
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CoglPipeline *pipeline,
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CoglVerticesMode mode,
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int first_vertex,
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int n_vertices,
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CoglAttribute **attributes,
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int n_attributes,
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CoglDrawFlags flags);
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void
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(* framebuffer_draw_indexed_attributes) (CoglFramebuffer *framebuffer,
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CoglPipeline *pipeline,
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CoglVerticesMode mode,
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int first_vertex,
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int n_vertices,
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CoglIndices *indices,
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CoglAttribute **attributes,
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int n_attributes,
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CoglDrawFlags flags);
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/* Destroys any driver specific resources associated with the given
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* 2D texture. */
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void
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(* texture_2d_free) (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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CoglBool
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(* texture_2d_can_create) (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
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(* texture_2d_init) (CoglTexture2D *tex_2d);
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/* Instantiates a new CoglTexture2D object with un-initialized
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* storage for a given size and internal format */
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CoglTexture2D *
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(* texture_2d_new_with_size) (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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CoglError **error);
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/* Instantiates a new CoglTexture2D object with storage initialized
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* with the contents of the given bitmap, using the specified
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* internal format.
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*/
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CoglTexture2D *
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(* texture_2d_new_from_bitmap) (CoglBitmap *bmp,
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CoglPixelFormat internal_format,
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CoglError **error);
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#if defined (COGL_HAS_EGL_SUPPORT) && defined (EGL_KHR_image_base)
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/* Instantiates a new CoglTexture2D object with storage initialized
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* with the contents of the given EGL image.
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*
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* This is optional for drivers to support
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*/
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CoglTexture2D *
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(* egl_texture_2d_new_from_image) (CoglContext *ctx,
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int width,
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int height,
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CoglPixelFormat format,
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EGLImageKHR image,
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CoglError **error);
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#endif
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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
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(* texture_2d_copy_from_framebuffer) (CoglTexture2D *tex_2d,
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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 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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/* 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
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(* texture_2d_get_gl_handle) (CoglTexture2D *tex_2d);
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/* Update all mipmap levels > 0 */
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void
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(* texture_2d_generate_mipmap) (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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void
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(* texture_2d_copy_from_bitmap) (CoglTexture2D *tex_2d,
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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 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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/* 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
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(* texture_2d_get_data) (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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/* Prepares for drawing by flushing the journal, framebuffer state,
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* pipeline state and attribute state.
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*/
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void
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(* flush_attributes_state) (CoglFramebuffer *framebuffer,
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CoglPipeline *pipeline,
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CoglFlushLayerState *layer_state,
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CoglDrawFlags flags,
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CoglAttribute **attributes,
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int n_attributes);
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/* Flushes the clip stack to the GPU using a combination of the
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* stencil buffer, scissor and clip plane state.
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*/
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void
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(* clip_stack_flush) (CoglClipStack *stack, CoglFramebuffer *framebuffer);
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/* Enables the driver to create some meta data to represent a buffer
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* but with no corresponding storage allocated yet.
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*/
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void
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(* buffer_create) (CoglBuffer *buffer);
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void
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(* buffer_destroy) (CoglBuffer *buffer);
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/* Maps a buffer into the CPU */
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void *
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(* buffer_map_range) (CoglBuffer *buffer,
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size_t offset,
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size_t size,
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CoglBufferAccess access,
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CoglBufferMapHint hints);
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/* Unmaps a buffer */
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void
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(* buffer_unmap) (CoglBuffer *buffer);
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/* Uploads data to the buffer without needing to map it necessarily
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*/
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CoglBool
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(* buffer_set_data) (CoglBuffer *buffer,
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unsigned int offset,
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const void *data,
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unsigned int size);
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};
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#endif /* __COGL_DRIVER_H */
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