ec5009fa23
The Intel driver currently has an optimisation when calling glReadPixels into a PBO so that it will use a blit instead of the Mesa fallback path. However this only works if the GL_PACK_ALIGNMENT is exactly 1, even if this would be equivalent to a higher alignment value because the bpp*width is already aligned. To make it more likely to hit this fast path, we now detect this situation and explicitly use an alignment of 1. To make this work the texture driver needs to be passed down the bpp*width as well as the rowstride when configuring the alignment. Reviewed-by: Robert Bragg <robert@linux.intel.com>
413 lines
15 KiB
C
413 lines
15 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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* Authors:
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* Matthew Allum <mallum@openedhand.com>
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* Neil Roberts <neil@linux.intel.com>
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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl-private.h"
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#include "cogl-util.h"
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#include "cogl-bitmap.h"
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#include "cogl-bitmap-private.h"
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#include "cogl-texture-private.h"
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#include "cogl-pipeline.h"
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#include "cogl-context-private.h"
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#include "cogl-handle.h"
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#include "cogl-primitives.h"
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#include "cogl-pipeline-opengl-private.h"
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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static void
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_cogl_texture_driver_gen (CoglContext *ctx,
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GLenum gl_target,
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GLsizei n,
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GLuint *textures)
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{
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unsigned int i;
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GE (ctx, glGenTextures (n, textures));
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for (i = 0; i < n; i++)
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{
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_cogl_bind_gl_texture_transient (gl_target,
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textures[i],
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FALSE);
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switch (gl_target)
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{
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case GL_TEXTURE_2D:
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case GL_TEXTURE_3D:
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/* GL_TEXTURE_MAG_FILTER defaults to GL_LINEAR, no need to set it */
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GE( ctx, glTexParameteri (gl_target,
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GL_TEXTURE_MIN_FILTER,
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GL_LINEAR) );
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break;
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case GL_TEXTURE_RECTANGLE_ARB:
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/* Texture rectangles already default to GL_LINEAR so nothing
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needs to be done */
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break;
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default:
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g_assert_not_reached();
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}
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}
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}
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/* OpenGL - unlike GLES - can upload a sub region of pixel data from a larger
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* source buffer */
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static void
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prep_gl_for_pixels_upload_full (CoglContext *ctx,
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int pixels_rowstride,
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int image_height,
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int pixels_src_x,
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int pixels_src_y,
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int pixels_bpp)
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{
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GE( ctx, glPixelStorei (GL_UNPACK_ROW_LENGTH,
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pixels_rowstride / pixels_bpp) );
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GE( ctx, glPixelStorei (GL_UNPACK_SKIP_PIXELS, pixels_src_x) );
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GE( ctx, glPixelStorei (GL_UNPACK_SKIP_ROWS, pixels_src_y) );
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if (cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_3D))
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GE( ctx, glPixelStorei (GL_UNPACK_IMAGE_HEIGHT, image_height) );
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_cogl_texture_prep_gl_alignment_for_pixels_upload (pixels_rowstride);
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}
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static void
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_cogl_texture_driver_prep_gl_for_pixels_upload (CoglContext *ctx,
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int pixels_rowstride,
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int pixels_bpp)
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{
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prep_gl_for_pixels_upload_full (ctx, pixels_rowstride, 0, 0, 0, pixels_bpp);
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}
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/* OpenGL - unlike GLES - can download pixel data into a sub region of
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* a larger destination buffer */
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static void
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prep_gl_for_pixels_download_full (CoglContext *ctx,
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int image_width,
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int pixels_rowstride,
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int image_height,
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int pixels_src_x,
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int pixels_src_y,
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int pixels_bpp)
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{
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GE( ctx, glPixelStorei (GL_PACK_ROW_LENGTH, pixels_rowstride / pixels_bpp) );
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GE( ctx, glPixelStorei (GL_PACK_SKIP_PIXELS, pixels_src_x) );
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GE( ctx, glPixelStorei (GL_PACK_SKIP_ROWS, pixels_src_y) );
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if (cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_3D))
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GE( ctx, glPixelStorei (GL_PACK_IMAGE_HEIGHT, image_height) );
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_cogl_texture_prep_gl_alignment_for_pixels_download (pixels_bpp,
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image_width,
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pixels_rowstride);
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}
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static void
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_cogl_texture_driver_prep_gl_for_pixels_download (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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prep_gl_for_pixels_download_full (ctx,
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pixels_rowstride,
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image_width,
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0 /* image height */,
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0, 0, /* pixels_src_x/y */
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pixels_bpp);
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}
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static void
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_cogl_texture_driver_upload_subregion_to_gl (CoglContext *ctx,
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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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guint8 *data;
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CoglPixelFormat source_format = cogl_bitmap_get_format (source_bmp);
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int bpp = _cogl_pixel_format_get_bytes_per_pixel (source_format);
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data = _cogl_bitmap_bind (source_bmp, COGL_BUFFER_ACCESS_READ, 0);
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/* Setup gl alignment to match rowstride and top-left corner */
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prep_gl_for_pixels_upload_full (ctx,
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cogl_bitmap_get_rowstride (source_bmp),
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0,
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src_x,
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src_y,
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bpp);
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_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
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GE( ctx, glTexSubImage2D (gl_target, 0,
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dst_x, dst_y,
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width, height,
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source_gl_format,
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source_gl_type,
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data) );
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_cogl_bitmap_unbind (source_bmp);
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}
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static void
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_cogl_texture_driver_upload_to_gl (CoglContext *ctx,
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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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guint8 *data;
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CoglPixelFormat source_format = cogl_bitmap_get_format (source_bmp);
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int bpp = _cogl_pixel_format_get_bytes_per_pixel (source_format);
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data = _cogl_bitmap_bind (source_bmp, COGL_BUFFER_ACCESS_READ, 0);
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/* Setup gl alignment to match rowstride and top-left corner */
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prep_gl_for_pixels_upload_full (ctx,
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cogl_bitmap_get_rowstride (source_bmp),
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0, 0, 0, bpp);
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_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
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GE( ctx, glTexImage2D (gl_target, 0,
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internal_gl_format,
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cogl_bitmap_get_width (source_bmp),
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cogl_bitmap_get_height (source_bmp),
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0,
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source_gl_format,
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source_gl_type,
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data) );
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_cogl_bitmap_unbind (source_bmp);
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}
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static void
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_cogl_texture_driver_upload_to_gl_3d (CoglContext *ctx,
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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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guint8 *data;
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CoglPixelFormat source_format = cogl_bitmap_get_format (source_bmp);
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int bpp = _cogl_pixel_format_get_bytes_per_pixel (source_format);
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data = _cogl_bitmap_bind (source_bmp, COGL_BUFFER_ACCESS_READ, 0);
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/* Setup gl alignment to match rowstride and top-left corner */
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prep_gl_for_pixels_upload_full (ctx,
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cogl_bitmap_get_rowstride (source_bmp),
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(cogl_bitmap_get_height (source_bmp) /
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depth),
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0, 0, bpp);
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_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
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GE( ctx, glTexImage3D (gl_target,
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0, /* level */
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internal_gl_format,
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cogl_bitmap_get_width (source_bmp),
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height,
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depth,
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0,
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source_gl_format,
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source_gl_type,
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data) );
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_cogl_bitmap_unbind (source_bmp);
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}
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static gboolean
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_cogl_texture_driver_gl_get_tex_image (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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guint8 *dest)
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{
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GE (ctx, glGetTexImage (gl_target,
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0, /* level */
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dest_gl_format,
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dest_gl_type,
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(GLvoid *)dest));
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return TRUE;
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}
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static gboolean
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_cogl_texture_driver_size_supported_3d (CoglContext *ctx,
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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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GLenum proxy_target;
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GLint new_width = 0;
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if (gl_target == GL_TEXTURE_3D)
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proxy_target = GL_PROXY_TEXTURE_3D;
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else
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/* Unknown target, assume it's not supported */
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return FALSE;
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/* Proxy texture allows for a quick check for supported size */
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GE( ctx, glTexImage3D (proxy_target, 0, GL_RGBA,
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width, height, depth, 0 /* border */,
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gl_format, gl_type, NULL) );
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GE( ctx, glGetTexLevelParameteriv (proxy_target, 0,
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GL_TEXTURE_WIDTH, &new_width) );
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return new_width != 0;
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}
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static gboolean
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_cogl_texture_driver_size_supported (CoglContext *ctx,
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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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GLenum proxy_target;
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GLint new_width = 0;
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if (gl_target == GL_TEXTURE_2D)
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proxy_target = GL_PROXY_TEXTURE_2D;
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#if HAVE_COGL_GL
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else if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
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proxy_target = GL_PROXY_TEXTURE_RECTANGLE_ARB;
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#endif
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else
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/* Unknown target, assume it's not supported */
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return FALSE;
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/* Proxy texture allows for a quick check for supported size */
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GE( ctx, glTexImage2D (proxy_target, 0, GL_RGBA,
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width, height, 0 /* border */,
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gl_format, gl_type, NULL) );
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GE( ctx, glGetTexLevelParameteriv (proxy_target, 0,
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GL_TEXTURE_WIDTH, &new_width) );
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return new_width != 0;
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}
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static void
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_cogl_texture_driver_try_setting_gl_border_color
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(CoglContext *ctx,
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GLuint gl_target,
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const GLfloat *transparent_color)
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{
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/* Use a transparent border color so that we can leave the
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color buffer alone when using texture co-ordinates
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outside of the texture */
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GE( ctx, glTexParameterfv (gl_target, GL_TEXTURE_BORDER_COLOR,
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transparent_color) );
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}
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static gboolean
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_cogl_texture_driver_allows_foreign_gl_target (CoglContext *ctx,
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GLenum gl_target)
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{
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/* GL_ARB_texture_rectangle textures are supported if they are
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created from foreign because some chipsets have trouble with
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GL_ARB_texture_non_power_of_two. There is no Cogl call to create
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them directly to emphasize the fact that they don't work fully
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(for example, no mipmapping and complicated shader support) */
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/* Allow 2-dimensional or rectangle textures only */
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if (gl_target != GL_TEXTURE_2D && gl_target != GL_TEXTURE_RECTANGLE_ARB)
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return FALSE;
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return TRUE;
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}
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static void
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_cogl_texture_driver_gl_generate_mipmaps (CoglContext *ctx,
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GLenum gl_target)
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{
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GE( ctx, glGenerateMipmap (gl_target) );
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}
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static CoglPixelFormat
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_cogl_texture_driver_find_best_gl_get_data_format
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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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{
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return context->driver_vtable->pixel_format_to_gl (context,
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format,
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NULL, /* don't need */
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closest_gl_format,
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closest_gl_type);
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}
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const CoglTextureDriver
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_cogl_texture_driver_gl =
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{
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_cogl_texture_driver_gen,
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_cogl_texture_driver_prep_gl_for_pixels_upload,
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_cogl_texture_driver_upload_subregion_to_gl,
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_cogl_texture_driver_upload_to_gl,
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_cogl_texture_driver_upload_to_gl_3d,
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_cogl_texture_driver_prep_gl_for_pixels_download,
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_cogl_texture_driver_gl_get_tex_image,
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_cogl_texture_driver_size_supported,
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_cogl_texture_driver_size_supported_3d,
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_cogl_texture_driver_try_setting_gl_border_color,
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_cogl_texture_driver_allows_foreign_gl_target,
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_cogl_texture_driver_gl_generate_mipmaps,
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_cogl_texture_driver_find_best_gl_get_data_format
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};
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