df77e8565e
According to the EGL spec, eglGetProcAddress should only be used to retrieve extension functions. It also says that returning non-NULL does not mean the extension is available so you could interpret this as saying that the function is allowed to return garbage for core functions. This seems to happen at least for the Android implementation of EGL. To workaround this the winsys's are now passed down a flag to say whether the function is from the core API. This information is already in the gl-prototypes headers as the minimum core GL version and as a pair of flags to specify whether it is available in core GLES1 and GLES2. If the function is in core the EGL winsys will now avoid using eglGetProcAddress and always fallback to querying the library directly with the GModule API. The GLX winsys is left alone because glXGetProcAddress apparently supports querying core API and extension functions. The WGL winsys could ideally be changed because wglGetProcAddress should also only be used for extension functions but the situation is slightly different because WGL considers anything from GL > 1.1 to be an extension so it would need a bit more information to determine whether to query the function directly from the library. The SDL winsys is also left alone because it's not as easy to portably determine which GL library SDL has chosen to load in order to resolve the symbols directly. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 72089730ad06ccdd38a344279a893965ae68cec1) Since we aren't able to break API on the 1.12 branch cogl_get_proc_address is still supported but isn't easily able to determine whether the given name corresponds to a core symbol or not. For now we just assume the symbol being queried isn't part of the core GL api and update the documentation accordingly.
503 lines
16 KiB
C
503 lines
16 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-private.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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static CoglBool
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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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/* It doesn't really matter we convert to exact same
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format (some have no cogl match anyway) since format
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is re-matched against cogl when getting or setting
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texture image data.
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*/
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switch (gl_int_format)
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{
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case GL_ALPHA: case GL_ALPHA4: case GL_ALPHA8:
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case GL_ALPHA12: case GL_ALPHA16:
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*out_format = COGL_PIXEL_FORMAT_A_8;
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return TRUE;
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case GL_LUMINANCE: case GL_LUMINANCE4: case GL_LUMINANCE8:
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case GL_LUMINANCE12: case GL_LUMINANCE16:
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*out_format = COGL_PIXEL_FORMAT_G_8;
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return TRUE;
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case GL_RGB: case GL_RGB4: case GL_RGB5: case GL_RGB8:
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case GL_RGB10: case GL_RGB12: case GL_RGB16: case GL_R3_G3_B2:
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*out_format = COGL_PIXEL_FORMAT_RGB_888;
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return TRUE;
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case GL_RGBA: case GL_RGBA2: case GL_RGBA4: case GL_RGB5_A1:
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case GL_RGBA8: case GL_RGB10_A2: case GL_RGBA12: case GL_RGBA16:
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*out_format = COGL_PIXEL_FORMAT_RGBA_8888;
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return TRUE;
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}
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return FALSE;
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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_RGB_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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break;
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case COGL_PIXEL_FORMAT_BGR_888:
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glintformat = GL_RGB;
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glformat = GL_BGR;
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gltype = GL_UNSIGNED_BYTE;
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break;
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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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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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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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glintformat = GL_RGBA;
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glformat = GL_BGRA;
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gltype = GL_UNSIGNED_BYTE;
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break;
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/* The following two types of channel ordering
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* have no GL equivalent unless defined using
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* system word byte ordering */
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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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glintformat = GL_RGBA;
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glformat = GL_BGRA;
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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gltype = GL_UNSIGNED_INT_8_8_8_8;
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#else
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gltype = GL_UNSIGNED_INT_8_8_8_8_REV;
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#endif
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break;
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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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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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gltype = GL_UNSIGNED_INT_8_8_8_8;
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#else
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gltype = GL_UNSIGNED_INT_8_8_8_8_REV;
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#endif
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break;
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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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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_INT_10_10_10_2;
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break;
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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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glintformat = GL_RGBA;
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glformat = GL_BGRA;
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gltype = GL_UNSIGNED_INT_10_10_10_2;
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break;
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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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glintformat = GL_RGBA;
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glformat = GL_RGBA;
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gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
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break;
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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_BGRA;
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gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
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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 CoglBool
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_cogl_get_gl_version (CoglContext *ctx,
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int *major_out,
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int *minor_out)
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{
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const char *version_string, *major_end, *minor_end;
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int major = 0, minor = 0;
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/* Get the OpenGL version number */
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if ((version_string = (const char *) ctx->glGetString (GL_VERSION)) == NULL)
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return FALSE;
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/* Extract the major number */
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for (major_end = version_string; *major_end >= '0'
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&& *major_end <= '9'; major_end++)
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major = (major * 10) + *major_end - '0';
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/* If there were no digits or the major number isn't followed by a
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dot then it is invalid */
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if (major_end == version_string || *major_end != '.')
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return FALSE;
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/* Extract the minor number */
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for (minor_end = major_end + 1; *minor_end >= '0'
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&& *minor_end <= '9'; minor_end++)
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minor = (minor * 10) + *minor_end - '0';
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/* If there were no digits or there is an unexpected character then
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it is invalid */
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if (minor_end == major_end + 1
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|| (*minor_end && *minor_end != ' ' && *minor_end != '.'))
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return FALSE;
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*major_out = major;
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*minor_out = minor;
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return TRUE;
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}
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static CoglBool
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check_gl_version (CoglContext *ctx,
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GError **error)
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{
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int major, minor;
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const char *gl_extensions;
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if (!_cogl_get_gl_version (ctx, &major, &minor))
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{
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g_set_error (error,
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COGL_DRIVER_ERROR,
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COGL_DRIVER_ERROR_UNKNOWN_VERSION,
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"The OpenGL version could not be determined");
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return FALSE;
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}
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/* GL 1.3 supports all of the required functionality in core */
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if (COGL_CHECK_GL_VERSION (major, minor, 1, 3))
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return TRUE;
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gl_extensions = (const char*) ctx->glGetString (GL_EXTENSIONS);
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/* OpenGL 1.2 is only supported if we have the multitexturing
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extension */
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if (!_cogl_check_extension ("GL_ARB_multitexture", gl_extensions))
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{
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g_set_error (error,
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COGL_DRIVER_ERROR,
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COGL_DRIVER_ERROR_INVALID_VERSION,
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"The OpenGL driver is missing "
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"the GL_ARB_multitexture extension");
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return FALSE;
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}
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/* OpenGL 1.2 is required */
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if (!COGL_CHECK_GL_VERSION (major, minor, 1, 2))
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{
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g_set_error (error,
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COGL_DRIVER_ERROR,
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COGL_DRIVER_ERROR_INVALID_VERSION,
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"The OpenGL version of your driver (%i.%i) "
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"is not compatible with Cogl",
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major, minor);
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return FALSE;
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}
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return TRUE;
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}
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static CoglBool
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_cogl_driver_update_features (CoglContext *ctx,
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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 max_clip_planes = 0;
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int num_stencil_bits = 0;
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int gl_major = 0, gl_minor = 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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ctx->glGetString =
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(void *) _cogl_renderer_get_proc_address (ctx->display->renderer,
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"glGetString",
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TRUE);
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if (!check_gl_version (ctx, error))
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return FALSE;
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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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ctx->glGetString (GL_VENDOR),
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ctx->glGetString (GL_RENDERER),
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ctx->glGetString (GL_VERSION),
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ctx->glGetString (GL_EXTENSIONS));
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_cogl_get_gl_version (ctx, &gl_major, &gl_minor);
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_cogl_gpu_info_init (ctx, &ctx->gpu);
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flags = (COGL_FEATURE_TEXTURE_READ_PIXELS
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| COGL_FEATURE_UNSIGNED_INT_INDICES
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| COGL_FEATURE_DEPTH_RANGE);
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COGL_FLAGS_SET (ctx->features,
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COGL_FEATURE_ID_UNSIGNED_INT_INDICES, TRUE);
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COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_DEPTH_RANGE, TRUE);
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if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 1, 4))
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COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_MIRRORED_REPEAT, TRUE);
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gl_extensions = (const char *)ctx->glGetString (GL_EXTENSIONS);
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_cogl_feature_check_ext_functions (ctx,
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gl_major,
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gl_minor,
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gl_extensions);
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if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 0) ||
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_cogl_check_extension ("GL_ARB_texture_non_power_of_two", 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 (ctx->features, COGL_FEATURE_ID_TEXTURE_NPOT, TRUE);
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COGL_FLAGS_SET (ctx->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_BASIC, TRUE);
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COGL_FLAGS_SET (ctx->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_MIPMAP, TRUE);
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COGL_FLAGS_SET (ctx->features,
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COGL_FEATURE_ID_TEXTURE_NPOT_REPEAT, TRUE);
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}
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if (_cogl_check_extension ("GL_MESA_pack_invert", gl_extensions))
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private_flags |= COGL_PRIVATE_FEATURE_MESA_PACK_INVERT;
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GE( ctx, 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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GE( ctx, 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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if (ctx->glGenRenderbuffers)
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{
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flags |= COGL_FEATURE_OFFSCREEN;
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COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_OFFSCREEN, TRUE);
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}
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if (ctx->glBlitFramebuffer)
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private_flags |= COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT;
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if (ctx->glRenderbufferStorageMultisampleIMG)
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{
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flags |= COGL_FEATURE_OFFSCREEN_MULTISAMPLE;
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COGL_FLAGS_SET (ctx->features,
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COGL_FEATURE_ID_OFFSCREEN_MULTISAMPLE, TRUE);
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}
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if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 1) ||
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_cogl_check_extension ("GL_EXT_pixel_buffer_object", gl_extensions))
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private_flags |= COGL_PRIVATE_FEATURE_PBOS;
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if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 2, 0) ||
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_cogl_check_extension ("GL_ARB_point_sprite", gl_extensions))
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{
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flags |= COGL_FEATURE_POINT_SPRITE;
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COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_POINT_SPRITE, TRUE);
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}
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if (ctx->glGenPrograms)
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{
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flags |= COGL_FEATURE_SHADERS_ARBFP;
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COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_ARBFP, TRUE);
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}
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if (ctx->glCreateProgram)
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{
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flags |= COGL_FEATURE_SHADERS_GLSL;
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COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_GLSL, TRUE);
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}
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/* If all of the old GLSL extensions are available then we can fake
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* the GL 2.0 GLSL support by diverting to the old function names */
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else if (ctx->glCreateProgramObject && /* GL_ARB_shader_objects */
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ctx->glVertexAttribPointer && /* GL_ARB_vertex_shader */
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_cogl_check_extension ("GL_ARB_fragment_shader", gl_extensions))
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{
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ctx->glCreateShader = ctx->glCreateShaderObject;
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ctx->glCreateProgram = ctx->glCreateProgramObject;
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ctx->glDeleteShader = ctx->glDeleteObject;
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ctx->glDeleteProgram = ctx->glDeleteObject;
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ctx->glAttachShader = ctx->glAttachObject;
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ctx->glUseProgram = ctx->glUseProgramObject;
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ctx->glGetProgramInfoLog = ctx->glGetInfoLog;
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ctx->glGetShaderInfoLog = ctx->glGetInfoLog;
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ctx->glGetShaderiv = ctx->glGetObjectParameteriv;
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ctx->glGetProgramiv = ctx->glGetObjectParameteriv;
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ctx->glDetachShader = ctx->glDetachObject;
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ctx->glGetAttachedShaders = ctx->glGetAttachedObjects;
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/* FIXME: there doesn't seem to be an equivalent for glIsShader
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* and glIsProgram. This doesn't matter for now because Cogl
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* doesn't use these but if we add support for simulating a
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* GLES2 context on top of regular GL then we'll need to do
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* something here */
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flags |= COGL_FEATURE_SHADERS_GLSL;
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COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_GLSL, TRUE);
|
|
}
|
|
|
|
if (ctx->glGenBuffers)
|
|
{
|
|
private_flags |= COGL_PRIVATE_FEATURE_VBOS;
|
|
flags |= (COGL_FEATURE_MAP_BUFFER_FOR_READ |
|
|
COGL_FEATURE_MAP_BUFFER_FOR_WRITE);
|
|
COGL_FLAGS_SET (ctx->features,
|
|
COGL_FEATURE_ID_MAP_BUFFER_FOR_READ, TRUE);
|
|
COGL_FLAGS_SET (ctx->features,
|
|
COGL_FEATURE_ID_MAP_BUFFER_FOR_WRITE, TRUE);
|
|
}
|
|
|
|
if (_cogl_check_extension ("GL_ARB_texture_rectangle", gl_extensions))
|
|
{
|
|
flags |= COGL_FEATURE_TEXTURE_RECTANGLE;
|
|
COGL_FLAGS_SET (ctx->features,
|
|
COGL_FEATURE_ID_TEXTURE_RECTANGLE, TRUE);
|
|
}
|
|
|
|
if (ctx->glTexImage3D)
|
|
{
|
|
flags |= COGL_FEATURE_TEXTURE_3D;
|
|
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_TEXTURE_3D, TRUE);
|
|
}
|
|
|
|
if (ctx->glEGLImageTargetTexture2D)
|
|
private_flags |= COGL_PRIVATE_FEATURE_TEXTURE_2D_FROM_EGL_IMAGE;
|
|
|
|
if (_cogl_check_extension ("GL_EXT_packed_depth_stencil", gl_extensions))
|
|
private_flags |= COGL_PRIVATE_FEATURE_EXT_PACKED_DEPTH_STENCIL;
|
|
|
|
if (ctx->glGenSamplers)
|
|
private_flags |= COGL_PRIVATE_FEATURE_SAMPLER_OBJECTS;
|
|
|
|
/* Cache features */
|
|
ctx->private_feature_flags |= private_flags;
|
|
ctx->feature_flags |= flags;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
const CoglDriverVtable
|
|
_cogl_driver_gl =
|
|
{
|
|
_cogl_driver_pixel_format_from_gl_internal,
|
|
_cogl_driver_pixel_format_to_gl,
|
|
_cogl_driver_update_features
|
|
};
|