2616ae0fa9
This adds a new CoglDriver for GL 3 called COGL_DRIVER_GL3. When requested, the GLX, EGL and SDL2 winsyss will set the necessary attributes to request a forward-compatible core profile 3.1 context. That means it will have no deprecated features. To simplify the explosion of checks for specific combinations of context->driver, many of these conditionals have now been replaced with private feature flags that are checked instead. The GL and GLES drivers now initialise these private feature flags depending on which driver is used. The fixed function backends now explicitly check whether the fixed function private feature is available which means the GL3 driver will fall back to always using the GLSL progend. Since Rob's latest patches the GLSL progend no longer uses any fixed function API anyway so it should just work. The driver is currently lower priority than COGL_DRIVER_GL so it will not be used unless it is specificly requested. We may want to change this priority at some point because apparently Mesa can make some memory savings if a core profile context is used. In GL 3, getting the combined extensions string with glGetString is deprecated so this patch changes it to use glGetStringi to build up an array of extensions instead. _cogl_context_get_gl_extensions now returns this array instead of trying to return a const string. The caller is expected to free the array. Some issues with this patch: • GL 3 does not support GL_ALPHA format textures. We should probably make this a feature flag or something. Cogl uses this to render text which currently just throws a GL error and breaks so it's pretty important to do something about this before considering the GL3 driver to be stable. • GL 3 doesn't support client side vertex buffers. This probably doesn't matter because CoglBuffer won't normally use malloc'd buffers if VBOs are available, but it might but worth making malloc'd buffers a private feature and forcing it not to use them. • GL 3 doesn't support the default vertex array object. This patch just makes it create and bind a single non-default vertex array object which gets used just like the normal default object. Ideally it would be good to use vertex array objects properly and attach them to a CoglPrimitive to cache the state. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 66c9db993595b3a22e63f4c201ea468bc9b88cb6)
399 lines
13 KiB
C
399 lines
13 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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#include "cogl-framebuffer-gl-private.h"
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#include "cogl-texture-2d-gl-private.h"
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#include "cogl-attribute-gl-private.h"
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#include "cogl-clip-stack-gl-private.h"
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#include "cogl-buffer-gl-private.h"
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#ifndef GL_UNSIGNED_INT_24_8
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#define GL_UNSIGNED_INT_24_8 0x84FA
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#endif
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#ifndef GL_DEPTH_STENCIL
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#define GL_DEPTH_STENCIL 0x84F9
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#endif
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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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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_DEPTH_16:
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glintformat = GL_DEPTH_COMPONENT;
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glformat = GL_DEPTH_COMPONENT;
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gltype = GL_UNSIGNED_SHORT;
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break;
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case COGL_PIXEL_FORMAT_DEPTH_32:
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glintformat = GL_DEPTH_COMPONENT;
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glformat = GL_DEPTH_COMPONENT;
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gltype = GL_UNSIGNED_INT;
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break;
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case COGL_PIXEL_FORMAT_DEPTH_24_STENCIL_8:
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glintformat = GL_DEPTH_STENCIL;
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glformat = GL_DEPTH_STENCIL;
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gltype = GL_UNSIGNED_INT_24_8;
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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_driver_update_features (CoglContext *context,
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CoglError **error)
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{
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CoglPrivateFeatureFlags private_flags = 0;
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CoglFeatureFlags flags = 0;
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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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TRUE);
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gl_extensions = _cogl_context_get_gl_extensions (context);
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if (G_UNLIKELY (COGL_DEBUG_ENABLED (COGL_DEBUG_WINSYS)))
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{
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char *all_extensions = g_strjoinv (" ", gl_extensions);
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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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_cogl_context_get_gl_version (context),
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all_extensions);
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g_free (all_extensions);
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}
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context->glsl_major = 1;
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context->glsl_minor = 0;
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_cogl_gpu_info_init (context, &context->gpu);
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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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private_flags |= COGL_PRIVATE_FEATURE_BLEND_CONSTANT;
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}
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else if (context->driver == COGL_DRIVER_GLES1)
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private_flags |= (COGL_PRIVATE_FEATURE_FIXED_FUNCTION |
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COGL_PRIVATE_FEATURE_ALPHA_TEST |
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COGL_PRIVATE_FEATURE_BUILTIN_POINT_SIZE_UNIFORM);
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private_flags |= (COGL_PRIVATE_FEATURE_VBOS |
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COGL_PRIVATE_FEATURE_ANY_GL);
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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_depth_texture", gl_extensions))
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{
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flags |= COGL_FEATURE_DEPTH_TEXTURE;
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COGL_FLAGS_SET (context->features, COGL_FEATURE_ID_DEPTH_TEXTURE, 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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g_strfreev (gl_extensions);
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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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_cogl_offscreen_gl_allocate,
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_cogl_offscreen_gl_free,
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_cogl_framebuffer_gl_flush_state,
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_cogl_framebuffer_gl_clear,
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_cogl_framebuffer_gl_query_bits,
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_cogl_framebuffer_gl_finish,
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_cogl_framebuffer_gl_discard_buffers,
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_cogl_framebuffer_gl_draw_attributes,
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_cogl_framebuffer_gl_draw_indexed_attributes,
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_cogl_texture_2d_gl_free,
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_cogl_texture_2d_gl_can_create,
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_cogl_texture_2d_gl_init,
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_cogl_texture_2d_gl_new_with_size,
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_cogl_texture_2d_gl_new_from_bitmap,
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#if defined (COGL_HAS_EGL_SUPPORT) && defined (EGL_KHR_image_base)
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_cogl_egl_texture_2d_gl_new_from_image,
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#endif
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_cogl_texture_2d_gl_copy_from_framebuffer,
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_cogl_texture_2d_gl_get_gl_handle,
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_cogl_texture_2d_gl_generate_mipmap,
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_cogl_texture_2d_gl_copy_from_bitmap,
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NULL, /* texture_2d_get_data */
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_cogl_gl_flush_attributes_state,
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_cogl_clip_stack_gl_flush,
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_cogl_buffer_gl_create,
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_cogl_buffer_gl_destroy,
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_cogl_buffer_gl_map,
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_cogl_buffer_gl_unmap,
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_cogl_buffer_gl_set_data,
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};
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