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ae5f8323c1
This extension lets you upload texture data from a subregion of a buffer by passing GL_UNPACK_ROW_LENGTH, GL_UNPACK_SKIP_PIXELS and GL_UNPACK_SKIP_ROWS to glPixelStore. When this extension is available the GLES texture driver will now avoid making a copy of the bitmap when a subregion is used. Note that Mesa doesn't currently advertise this extension but I've made a patch to propose it: http://lists.freedesktop.org/archives/mesa-dev/2012-March/020191.html
313 lines
10 KiB
C
313 lines
10 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include "cogl-internal.h"
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#include "cogl-context-private.h"
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#include "cogl-feature-private.h"
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#include "cogl-renderer-private.h"
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#include "cogl-private.h"
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static gboolean
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_cogl_driver_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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{
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return TRUE;
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}
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static CoglPixelFormat
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_cogl_driver_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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{
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CoglPixelFormat required_format;
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GLenum glintformat;
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GLenum glformat = 0;
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GLenum gltype;
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required_format = format;
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/* Find GL equivalents */
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switch (format)
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{
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case COGL_PIXEL_FORMAT_A_8:
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glintformat = GL_ALPHA;
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glformat = GL_ALPHA;
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gltype = GL_UNSIGNED_BYTE;
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break;
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case COGL_PIXEL_FORMAT_G_8:
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glintformat = GL_LUMINANCE;
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glformat = GL_LUMINANCE;
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gltype = GL_UNSIGNED_BYTE;
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break;
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case COGL_PIXEL_FORMAT_BGRA_8888:
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case COGL_PIXEL_FORMAT_BGRA_8888_PRE:
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/* There is an extension to support this format */
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if ((context->private_feature_flags &
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COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888))
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{
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/* For some reason the extension says you have to specify
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BGRA for the internal format too */
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glintformat = GL_BGRA_EXT;
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glformat = GL_BGRA_EXT;
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gltype = GL_UNSIGNED_BYTE;
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required_format = format;
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break;
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}
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/* flow through */
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/* Just one 24-bit ordering supported */
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case COGL_PIXEL_FORMAT_RGB_888:
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case COGL_PIXEL_FORMAT_BGR_888:
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glintformat = GL_RGB;
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glformat = GL_RGB;
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gltype = GL_UNSIGNED_BYTE;
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required_format = COGL_PIXEL_FORMAT_RGB_888;
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break;
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/* Just one 32-bit ordering supported */
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case COGL_PIXEL_FORMAT_RGBA_8888:
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case COGL_PIXEL_FORMAT_RGBA_8888_PRE:
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case COGL_PIXEL_FORMAT_ARGB_8888:
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case COGL_PIXEL_FORMAT_ARGB_8888_PRE:
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case COGL_PIXEL_FORMAT_ABGR_8888:
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case COGL_PIXEL_FORMAT_ABGR_8888_PRE:
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case COGL_PIXEL_FORMAT_RGBA_1010102:
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case COGL_PIXEL_FORMAT_RGBA_1010102_PRE:
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case COGL_PIXEL_FORMAT_BGRA_1010102:
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case COGL_PIXEL_FORMAT_BGRA_1010102_PRE:
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case COGL_PIXEL_FORMAT_ABGR_2101010:
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case COGL_PIXEL_FORMAT_ABGR_2101010_PRE:
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case COGL_PIXEL_FORMAT_ARGB_2101010:
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case COGL_PIXEL_FORMAT_ARGB_2101010_PRE:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_BYTE;
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required_format = COGL_PIXEL_FORMAT_RGBA_8888;
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required_format |= (format & COGL_PREMULT_BIT);
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break;
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/* The following three types of channel ordering
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* are always defined using system word byte
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* ordering (even according to GLES spec) */
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case COGL_PIXEL_FORMAT_RGB_565:
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glintformat = GL_RGB;
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glformat = GL_RGB;
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gltype = GL_UNSIGNED_SHORT_5_6_5;
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break;
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case COGL_PIXEL_FORMAT_RGBA_4444:
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case COGL_PIXEL_FORMAT_RGBA_4444_PRE:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_SHORT_4_4_4_4;
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break;
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case COGL_PIXEL_FORMAT_RGBA_5551:
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case COGL_PIXEL_FORMAT_RGBA_5551_PRE:
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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_SHORT_5_5_5_1;
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break;
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case COGL_PIXEL_FORMAT_ANY:
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case COGL_PIXEL_FORMAT_YUV:
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g_assert_not_reached ();
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break;
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}
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/* All of the pixel formats are handled above so if this hits then
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we've been given an invalid pixel format */
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g_assert (glformat != 0);
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if (out_glintformat != NULL)
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*out_glintformat = glintformat;
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if (out_glformat != NULL)
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*out_glformat = glformat;
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if (out_gltype != NULL)
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*out_gltype = gltype;
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return required_format;
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}
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static gboolean
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_cogl_driver_update_features (CoglContext *context,
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GError **error)
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{
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CoglPrivateFeatureFlags private_flags = 0;
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CoglFeatureFlags flags = 0;
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const char *gl_extensions;
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int num_stencil_bits = 0;
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/* We have to special case getting the pointer to the glGetString
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function because we need to use it to determine what functions we
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can expect */
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context->glGetString =
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(void *) _cogl_renderer_get_proc_address (context->display->renderer,
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"glGetString");
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COGL_NOTE (WINSYS,
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"Checking features\n"
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" GL_VENDOR: %s\n"
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" GL_RENDERER: %s\n"
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" GL_VERSION: %s\n"
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" GL_EXTENSIONS: %s",
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context->glGetString (GL_VENDOR),
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context->glGetString (GL_RENDERER),
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context->glGetString (GL_VERSION),
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context->glGetString (GL_EXTENSIONS));
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gl_extensions = (const char*) context->glGetString (GL_EXTENSIONS);
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_cogl_feature_check_ext_functions (context,
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-1 /* GL major version */,
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-1 /* GL minor version */,
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gl_extensions);
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GE( context, glGetIntegerv (GL_STENCIL_BITS, &num_stencil_bits) );
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/* We need at least three stencil bits to combine clips */
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if (num_stencil_bits > 2)
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private_flags |= COGL_PRIVATE_FEATURE_STENCIL_BUFFER;
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#ifdef HAVE_COGL_GLES
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if (context->driver == COGL_DRIVER_GLES1)
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{
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int max_clip_planes;
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GE( context, glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
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if (max_clip_planes >= 4)
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private_flags |= COGL_PRIVATE_FEATURE_FOUR_CLIP_PLANES;
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}
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#endif
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if (context->driver == COGL_DRIVER_GLES2)
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{
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flags |= COGL_FEATURE_SHADERS_GLSL | COGL_FEATURE_OFFSCREEN;
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/* Note GLES 2 core doesn't support mipmaps for npot textures or
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* repeat modes other than CLAMP_TO_EDGE. */
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flags |= COGL_FEATURE_TEXTURE_NPOT_BASIC;
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flags |= COGL_FEATURE_DEPTH_RANGE;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_GLSL, TRUE);
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_OFFSCREEN, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, TRUE);
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_DEPTH_RANGE, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_MIRRORED_REPEAT, TRUE);
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}
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private_flags |= COGL_PRIVATE_FEATURE_VBOS;
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/* Both GLES 1.1 and GLES 2.0 support point sprites in core */
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flags |= COGL_FEATURE_POINT_SPRITE;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_POINT_SPRITE, TRUE);
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if (context->glGenRenderbuffers)
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{
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flags |= COGL_FEATURE_OFFSCREEN;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_OFFSCREEN, TRUE);
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}
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if (context->glBlitFramebuffer)
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private_flags |= COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT;
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if (_cogl_check_extension ("GL_OES_element_index_uint", gl_extensions))
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{
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flags |= COGL_FEATURE_UNSIGNED_INT_INDICES;
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_UNSIGNED_INT_INDICES, TRUE);
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}
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if (_cogl_check_extension ("GL_OES_texture_npot", gl_extensions))
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{
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flags |= (COGL_FEATURE_TEXTURE_NPOT |
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COGL_FEATURE_TEXTURE_NPOT_BASIC |
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COGL_FEATURE_TEXTURE_NPOT_MIPMAP |
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COGL_FEATURE_TEXTURE_NPOT_REPEAT);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_REPEAT, TRUE);
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}
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else if (_cogl_check_extension ("GL_IMG_texture_npot", gl_extensions))
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{
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flags |= (COGL_FEATURE_TEXTURE_NPOT_BASIC |
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COGL_FEATURE_TEXTURE_NPOT_MIPMAP);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, TRUE);
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP, TRUE);
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}
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if (context->glTexImage3D)
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{
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flags |= COGL_FEATURE_TEXTURE_3D;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_TEXTURE_3D, TRUE);
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}
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if (context->glMapBuffer)
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{
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/* The GL_OES_mapbuffer extension doesn't support mapping for
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read */
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flags |= COGL_FEATURE_MAP_BUFFER_FOR_WRITE;
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COGL_FLAGS_SET (context->features,
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COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE, TRUE);
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}
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if (context->glEGLImageTargetTexture2D)
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private_flags |= COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE;
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if (_cogl_check_extension ("GL_OES_packed_depth_stencil", gl_extensions))
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private_flags |= COGL_PRIVATE_FEATURE_OES_PACKED_DEPTH_STENCIL;
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if (_cogl_check_extension ("GL_EXT_texture_format_BGRA8888", gl_extensions))
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private_flags |= COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888;
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if (_cogl_check_extension ("GL_EXT_unpack_subimage", gl_extensions))
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private_flags |= COGL_PRIVATE_FEATURE_UNPACK_SUBIMAGE;
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/* Cache features */
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context->private_feature_flags |= private_flags;
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context->feature_flags |= flags;
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return TRUE;
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}
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const CoglDriverVtable
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_cogl_driver_gles =
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{
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_cogl_driver_pixel_format_from_gl_internal,
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_cogl_driver_pixel_format_to_gl,
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_cogl_driver_update_features
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};
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