mirror of
https://github.com/brl/mutter.git
synced 2024-12-28 05:42:14 +00:00
bb3a008318
Cogl's support for offscreen rendering was originally written just to support
the clutter_texture_new_from_actor API and due to lack of documentation and
several confusing - non orthogonal - side effects of using the API it wasn't
really possible to use directly.
This commit does a number of things:
- It removes {gl,gles}/cogl-fbo.{c,h} and adds shared cogl-draw-buffer.{c,h}
files instead which should be easier to maintain.
- internally CoglFbo objects are now called CoglDrawBuffers. A
CoglDrawBuffer is an abstract base class that is inherited from to
implement CoglOnscreen and CoglOffscreen draw buffers. CoglOffscreen draw
buffers will initially be used to support the
cogl_offscreen_new_to_texture API, and CoglOnscreen draw buffers will
start to be used internally to represent windows as we aim to migrate some
of Clutter's backend code to Cogl.
- It makes draw buffer objects the owners of the following state:
- viewport
- projection matrix stack
- modelview matrix stack
- clip state
(This means when you switch between draw buffers you will automatically be
switching to their associated viewport, matrix and clip state)
Aside from hopefully making cogl_offscreen_new_to_texture be more useful
short term by having simpler and well defined semantics for
cogl_set_draw_buffer, as mentioned above this is the first step for a couple
of other things:
- Its a step toward moving ownership for windows down from Clutter backends
into Cogl, by (internally at least) introducing the CoglOnscreen draw
buffer. Note: the plan is that cogl_set_draw_buffer will accept on or
offscreen draw buffer handles, and the "target" argument will become
redundant since we will instead query the type of the given draw buffer
handle.
- Because we have a common type for on and offscreen framebuffers we can
provide a unified API for framebuffer management. Things like:
- blitting between buffers
- managing ancillary buffers (e.g. attaching depth and stencil buffers)
- size requisition
- clearing
444 lines
14 KiB
C
444 lines
14 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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.h"
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#include "cogl-internal.h"
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#include "cogl-context.h"
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typedef struct _CoglGLSymbolTableEntry
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{
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const char *name;
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void *ptr;
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} CoglGLSymbolTableEntry;
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gboolean
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cogl_check_extension (const gchar *name, const gchar *ext)
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{
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gchar *end;
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gint name_len, n;
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if (name == NULL || ext == NULL)
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return FALSE;
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end = (gchar*)(ext + strlen(ext));
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name_len = strlen(name);
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while (ext < end)
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{
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n = strcspn(ext, " ");
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if ((name_len == n) && (!strncmp(name, ext, n)))
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return TRUE;
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ext += (n + 1);
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}
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return FALSE;
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}
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gboolean
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_cogl_resolve_gl_symbols (CoglGLSymbolTableEntry *symbol_table,
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const char *suffix)
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{
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int i;
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gboolean status = TRUE;
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for (i = 0; symbol_table[i].name; i++)
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{
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char *full_name = g_strdup_printf ("%s%s", symbol_table[i].name, suffix);
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*((CoglFuncPtr *)symbol_table[i].ptr) = cogl_get_proc_address (full_name);
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g_free (full_name);
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if (!*((CoglFuncPtr *)symbol_table[i].ptr))
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{
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status = FALSE;
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break;
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}
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}
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return status;
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}
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#ifdef HAVE_CLUTTER_OSX
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static gboolean
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really_enable_npot (void)
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{
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/* OSX backend + ATI Radeon X1600 + NPOT texture + GL_REPEAT seems to crash
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* http://bugzilla.openedhand.com/show_bug.cgi?id=929
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*
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* Temporary workaround until post 0.8 we rejig the features set up a
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* little to allow the backend to overide.
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*/
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const char *gl_renderer;
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const char *env_string;
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/* Regardless of hardware, allow user to decide. */
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env_string = g_getenv ("COGL_ENABLE_NPOT");
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if (env_string != NULL)
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return env_string[0] == '1';
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gl_renderer = (char*)glGetString (GL_RENDERER);
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if (strstr (gl_renderer, "ATI Radeon X1600") != NULL)
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return FALSE;
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return TRUE;
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}
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#endif
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void
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_cogl_features_init (void)
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{
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CoglFeatureFlags flags = 0;
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const gchar *gl_extensions;
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GLint max_clip_planes = 0;
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GLint num_stencil_bits = 0;
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gboolean fbo_ARB = FALSE;
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gboolean fbo_EXT = FALSE;
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const char *suffix;
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_COGL_GET_CONTEXT (ctx, NO_RETVAL);
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flags = COGL_FEATURE_TEXTURE_READ_PIXELS;
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gl_extensions = (const gchar*) glGetString (GL_EXTENSIONS);
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if (cogl_check_extension ("GL_ARB_texture_non_power_of_two", gl_extensions))
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{
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#ifdef HAVE_CLUTTER_OSX
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if (really_enable_npot ())
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#endif
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flags |= COGL_FEATURE_TEXTURE_NPOT;
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}
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#ifdef GL_YCBCR_MESA
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if (cogl_check_extension ("GL_MESA_ycbcr_texture", gl_extensions))
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{
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flags |= COGL_FEATURE_TEXTURE_YUV;
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}
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#endif
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if (cogl_check_extension ("GL_ARB_shader_objects", gl_extensions) &&
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cogl_check_extension ("GL_ARB_vertex_shader", gl_extensions) &&
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cogl_check_extension ("GL_ARB_fragment_shader", gl_extensions))
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{
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ctx->drv.pf_glCreateProgramObjectARB =
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(COGL_PFNGLCREATEPROGRAMOBJECTARBPROC)
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cogl_get_proc_address ("glCreateProgramObjectARB");
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ctx->drv.pf_glCreateShaderObjectARB =
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(COGL_PFNGLCREATESHADEROBJECTARBPROC)
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cogl_get_proc_address ("glCreateShaderObjectARB");
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ctx->drv.pf_glShaderSourceARB =
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(COGL_PFNGLSHADERSOURCEARBPROC)
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cogl_get_proc_address ("glShaderSourceARB");
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ctx->drv.pf_glCompileShaderARB =
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(COGL_PFNGLCOMPILESHADERARBPROC)
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cogl_get_proc_address ("glCompileShaderARB");
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ctx->drv.pf_glAttachObjectARB =
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(COGL_PFNGLATTACHOBJECTARBPROC)
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cogl_get_proc_address ("glAttachObjectARB");
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ctx->drv.pf_glLinkProgramARB =
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(COGL_PFNGLLINKPROGRAMARBPROC)
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cogl_get_proc_address ("glLinkProgramARB");
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ctx->drv.pf_glUseProgramObjectARB =
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(COGL_PFNGLUSEPROGRAMOBJECTARBPROC)
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cogl_get_proc_address ("glUseProgramObjectARB");
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ctx->drv.pf_glGetUniformLocationARB =
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(COGL_PFNGLGETUNIFORMLOCATIONARBPROC)
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cogl_get_proc_address ("glGetUniformLocationARB");
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ctx->drv.pf_glDeleteObjectARB =
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(COGL_PFNGLDELETEOBJECTARBPROC)
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cogl_get_proc_address ("glDeleteObjectARB");
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ctx->drv.pf_glGetInfoLogARB =
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(COGL_PFNGLGETINFOLOGARBPROC)
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cogl_get_proc_address ("glGetInfoLogARB");
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ctx->drv.pf_glGetObjectParameterivARB =
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(COGL_PFNGLGETOBJECTPARAMETERIVARBPROC)
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cogl_get_proc_address ("glGetObjectParameterivARB");
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ctx->drv.pf_glUniform1fARB =
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(COGL_PFNGLUNIFORM1FARBPROC)
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cogl_get_proc_address ("glUniform1fARB");
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ctx->drv.pf_glVertexAttribPointerARB =
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(COGL_PFNGLVERTEXATTRIBPOINTERARBPROC)
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cogl_get_proc_address ("glVertexAttribPointerARB");
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ctx->drv.pf_glEnableVertexAttribArrayARB =
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(COGL_PFNGLENABLEVERTEXATTRIBARRAYARBPROC)
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cogl_get_proc_address ("glEnableVertexAttribArrayARB");
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ctx->drv.pf_glDisableVertexAttribArrayARB =
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(COGL_PFNGLDISABLEVERTEXATTRIBARRAYARBPROC)
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cogl_get_proc_address ("glDisableVertexAttribArrayARB");
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ctx->drv.pf_glUniform2fARB =
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(COGL_PFNGLUNIFORM2FARBPROC)
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cogl_get_proc_address ("glUniform2fARB");
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ctx->drv.pf_glUniform3fARB =
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(COGL_PFNGLUNIFORM3FARBPROC)
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cogl_get_proc_address ("glUniform3fARB");
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ctx->drv.pf_glUniform4fARB =
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(COGL_PFNGLUNIFORM4FARBPROC)
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cogl_get_proc_address ("glUniform4fARB");
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ctx->drv.pf_glUniform1fvARB =
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(COGL_PFNGLUNIFORM1FVARBPROC)
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cogl_get_proc_address ("glUniform1fvARB");
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ctx->drv.pf_glUniform2fvARB =
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(COGL_PFNGLUNIFORM2FVARBPROC)
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cogl_get_proc_address ("glUniform2fvARB");
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ctx->drv.pf_glUniform3fvARB =
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(COGL_PFNGLUNIFORM3FVARBPROC)
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cogl_get_proc_address ("glUniform3fvARB");
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ctx->drv.pf_glUniform4fvARB =
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(COGL_PFNGLUNIFORM4FVARBPROC)
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cogl_get_proc_address ("glUniform4fvARB");
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ctx->drv.pf_glUniform1iARB =
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(COGL_PFNGLUNIFORM1IARBPROC)
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cogl_get_proc_address ("glUniform1iARB");
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ctx->drv.pf_glUniform2iARB =
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(COGL_PFNGLUNIFORM2IARBPROC)
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cogl_get_proc_address ("glUniform2iARB");
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ctx->drv.pf_glUniform3iARB =
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(COGL_PFNGLUNIFORM3IARBPROC)
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cogl_get_proc_address ("glUniform3iARB");
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ctx->drv.pf_glUniform4iARB =
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(COGL_PFNGLUNIFORM4IARBPROC)
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cogl_get_proc_address ("glUniform4iARB");
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ctx->drv.pf_glUniform1ivARB =
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(COGL_PFNGLUNIFORM1IVARBPROC)
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cogl_get_proc_address ("glUniform1ivARB");
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ctx->drv.pf_glUniform2ivARB =
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(COGL_PFNGLUNIFORM2IVARBPROC)
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cogl_get_proc_address ("glUniform2ivARB");
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ctx->drv.pf_glUniform3ivARB =
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(COGL_PFNGLUNIFORM3IVARBPROC)
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cogl_get_proc_address ("glUniform3ivARB");
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ctx->drv.pf_glUniform4ivARB =
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(COGL_PFNGLUNIFORM4IVARBPROC)
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cogl_get_proc_address ("glUniform4ivARB");
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ctx->drv.pf_glUniformMatrix2fvARB =
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(COGL_PFNGLUNIFORMMATRIX2FVARBPROC)
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cogl_get_proc_address ("glUniformMatrix2fvARB");
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ctx->drv.pf_glUniformMatrix3fvARB =
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(COGL_PFNGLUNIFORMMATRIX3FVARBPROC)
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cogl_get_proc_address ("glUniformMatrix3fvARB");
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ctx->drv.pf_glUniformMatrix4fvARB =
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(COGL_PFNGLUNIFORMMATRIX4FVARBPROC)
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cogl_get_proc_address ("glUniformMatrix4fvARB");
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if (ctx->drv.pf_glCreateProgramObjectARB &&
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ctx->drv.pf_glCreateShaderObjectARB &&
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ctx->drv.pf_glShaderSourceARB &&
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ctx->drv.pf_glCompileShaderARB &&
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ctx->drv.pf_glAttachObjectARB &&
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ctx->drv.pf_glLinkProgramARB &&
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ctx->drv.pf_glUseProgramObjectARB &&
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ctx->drv.pf_glGetUniformLocationARB &&
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ctx->drv.pf_glDeleteObjectARB &&
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ctx->drv.pf_glGetInfoLogARB &&
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ctx->drv.pf_glGetObjectParameterivARB &&
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ctx->drv.pf_glUniform1fARB &&
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ctx->drv.pf_glUniform2fARB &&
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ctx->drv.pf_glUniform3fARB &&
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ctx->drv.pf_glUniform4fARB &&
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ctx->drv.pf_glUniform1fvARB &&
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ctx->drv.pf_glUniform2fvARB &&
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ctx->drv.pf_glUniform3fvARB &&
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ctx->drv.pf_glUniform4fvARB &&
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ctx->drv.pf_glUniform1iARB &&
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ctx->drv.pf_glUniform2iARB &&
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ctx->drv.pf_glUniform3iARB &&
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ctx->drv.pf_glUniform4iARB &&
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ctx->drv.pf_glUniform1ivARB &&
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ctx->drv.pf_glUniform2ivARB &&
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ctx->drv.pf_glUniform3ivARB &&
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ctx->drv.pf_glUniform4ivARB &&
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ctx->drv.pf_glUniformMatrix2fvARB &&
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ctx->drv.pf_glUniformMatrix3fvARB &&
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ctx->drv.pf_glUniformMatrix4fvARB &&
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ctx->drv.pf_glVertexAttribPointerARB &&
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ctx->drv.pf_glEnableVertexAttribArrayARB &&
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ctx->drv.pf_glDisableVertexAttribArrayARB)
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flags |= COGL_FEATURE_SHADERS_GLSL;
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}
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fbo_ARB = cogl_check_extension ("GL_ARB_framebuffer_object", gl_extensions);
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if (fbo_ARB)
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suffix = "";
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else
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{
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fbo_EXT = cogl_check_extension ("GL_EXT_framebuffer_object", gl_extensions);
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if (fbo_EXT)
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suffix = "EXT";
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}
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if (fbo_ARB || fbo_EXT)
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{
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CoglGLSymbolTableEntry symbol_table[] = {
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{"glGenRenderbuffers", &ctx->drv.pf_glGenRenderbuffers},
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{"glDeleteRenderbuffers", &ctx->drv.pf_glDeleteRenderbuffers},
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{"glBindRenderbuffer", &ctx->drv.pf_glBindRenderbuffer},
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{"glRenderbufferStorage", &ctx->drv.pf_glRenderbufferStorage},
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{"glGenFramebuffers", &ctx->drv.pf_glGenFramebuffers},
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{"glBindFramebuffer", &ctx->drv.pf_glBindFramebuffer},
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{"glFramebufferTexture2D", &ctx->drv.pf_glFramebufferTexture2D},
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{"glFramebufferRenderbuffer", &ctx->drv.pf_glFramebufferRenderbuffer},
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{"glCheckFramebufferStatus", &ctx->drv.pf_glCheckFramebufferStatus},
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{"glDeleteFramebuffers", &ctx->drv.pf_glDeleteFramebuffers},
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{"glGenerateMipmap", &ctx->drv.pf_glGenerateMipmap},
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{NULL, NULL}
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};
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if (_cogl_resolve_gl_symbols (symbol_table, suffix))
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flags |= COGL_FEATURE_OFFSCREEN;
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}
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if (cogl_check_extension ("GL_EXT_framebuffer_blit", gl_extensions))
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{
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ctx->drv.pf_glBlitFramebufferEXT =
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(COGL_PFNGLBLITFRAMEBUFFEREXTPROC)
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cogl_get_proc_address ("glBlitFramebufferEXT");
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if (ctx->drv.pf_glBlitFramebufferEXT)
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flags |= COGL_FEATURE_OFFSCREEN_BLIT;
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}
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if (cogl_check_extension ("GL_EXT_framebuffer_multisample", gl_extensions))
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{
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ctx->drv.pf_glRenderbufferStorageMultisampleEXT =
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(COGL_PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC)
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cogl_get_proc_address ("glRenderbufferStorageMultisampleEXT");
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if (ctx->drv.pf_glRenderbufferStorageMultisampleEXT)
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flags |= COGL_FEATURE_OFFSCREEN_MULTISAMPLE;
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}
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GE( 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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flags |= COGL_FEATURE_STENCIL_BUFFER;
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GE( glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
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if (max_clip_planes >= 4)
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flags |= COGL_FEATURE_FOUR_CLIP_PLANES;
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if (cogl_check_extension ("GL_ARB_vertex_buffer_object", gl_extensions))
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{
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ctx->drv.pf_glGenBuffersARB =
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(COGL_PFNGLGENBUFFERSARBPROC)
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cogl_get_proc_address ("glGenBuffersARB");
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ctx->drv.pf_glBindBufferARB =
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(COGL_PFNGLBINDBUFFERARBPROC)
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cogl_get_proc_address ("glBindBufferARB");
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ctx->drv.pf_glBufferDataARB =
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(COGL_PFNGLBUFFERDATAARBPROC)
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cogl_get_proc_address ("glBufferDataARB");
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ctx->drv.pf_glBufferSubDataARB =
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(COGL_PFNGLBUFFERSUBDATAARBPROC)
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cogl_get_proc_address ("glBufferSubDataARB");
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ctx->drv.pf_glDeleteBuffersARB =
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(COGL_PFNGLDELETEBUFFERSARBPROC)
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cogl_get_proc_address ("glDeleteBuffersARB");
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ctx->drv.pf_glMapBufferARB =
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(COGL_PFNGLMAPBUFFERARBPROC)
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cogl_get_proc_address ("glMapBufferARB");
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ctx->drv.pf_glUnmapBufferARB =
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(COGL_PFNGLUNMAPBUFFERARBPROC)
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cogl_get_proc_address ("glUnmapBufferARB");
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if (ctx->drv.pf_glGenBuffersARB
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&& ctx->drv.pf_glBindBufferARB
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&& ctx->drv.pf_glBufferDataARB
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&& ctx->drv.pf_glBufferSubDataARB
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&& ctx->drv.pf_glDeleteBuffersARB
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&& ctx->drv.pf_glMapBufferARB
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&& ctx->drv.pf_glUnmapBufferARB)
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flags |= COGL_FEATURE_VBOS;
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}
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/* These should always be available because they are defined in GL
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1.2, but we can't call it directly because under Windows
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functions > 1.1 aren't exported */
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ctx->drv.pf_glDrawRangeElements =
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(COGL_PFNGLDRAWRANGEELEMENTSPROC)
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cogl_get_proc_address ("glDrawRangeElements");
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ctx->drv.pf_glActiveTexture =
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(COGL_PFNGLACTIVETEXTUREPROC)
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cogl_get_proc_address ("glActiveTexture");
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ctx->drv.pf_glClientActiveTexture =
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(COGL_PFNGLCLIENTACTIVETEXTUREPROC)
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cogl_get_proc_address ("glClientActiveTexture");
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ctx->drv.pf_glBlendEquation =
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(COGL_PFNGLBLENDEQUATIONPROC)
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cogl_get_proc_address ("glBlendEquation");
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ctx->drv.pf_glBlendColor =
|
|
(COGL_PFNGLBLENDCOLORPROC)
|
|
cogl_get_proc_address ("glBlendColor");
|
|
|
|
/* Available in 1.4 */
|
|
ctx->drv.pf_glBlendFuncSeparate =
|
|
(COGL_PFNGLBLENDFUNCSEPARATEPROC)
|
|
cogl_get_proc_address ("glBlendFuncSeparate");
|
|
|
|
/* Available in 2.0 */
|
|
ctx->drv.pf_glBlendEquationSeparate =
|
|
(COGL_PFNGLBLENDEQUATIONSEPARATEPROC)
|
|
cogl_get_proc_address ("glBlendEquationSeparate");
|
|
|
|
/* Cache features */
|
|
ctx->feature_flags = flags;
|
|
ctx->features_cached = TRUE;
|
|
}
|
|
|