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
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2007,2008,2009 Intel Corporation.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
* Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <string.h>
|
|
|
|
#include "cogl.h"
|
|
|
|
#include "cogl-internal.h"
|
|
#include "cogl-context.h"
|
|
|
|
typedef struct _CoglGLSymbolTableEntry
|
|
{
|
|
const char *name;
|
|
void *ptr;
|
|
} CoglGLSymbolTableEntry;
|
|
|
|
gboolean
|
|
cogl_check_extension (const gchar *name, const gchar *ext)
|
|
{
|
|
gchar *end;
|
|
gint name_len, n;
|
|
|
|
if (name == NULL || ext == NULL)
|
|
return FALSE;
|
|
|
|
end = (gchar*)(ext + strlen(ext));
|
|
|
|
name_len = strlen(name);
|
|
|
|
while (ext < end)
|
|
{
|
|
n = strcspn(ext, " ");
|
|
|
|
if ((name_len == n) && (!strncmp(name, ext, n)))
|
|
return TRUE;
|
|
ext += (n + 1);
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
gboolean
|
|
_cogl_resolve_gl_symbols (CoglGLSymbolTableEntry *symbol_table,
|
|
const char *suffix)
|
|
{
|
|
int i;
|
|
gboolean status = TRUE;
|
|
for (i = 0; symbol_table[i].name; i++)
|
|
{
|
|
char *full_name = g_strdup_printf ("%s%s", symbol_table[i].name, suffix);
|
|
*((CoglFuncPtr *)symbol_table[i].ptr) = cogl_get_proc_address (full_name);
|
|
g_free (full_name);
|
|
if (!*((CoglFuncPtr *)symbol_table[i].ptr))
|
|
{
|
|
status = FALSE;
|
|
break;
|
|
}
|
|
}
|
|
return status;
|
|
}
|
|
|
|
#ifdef HAVE_CLUTTER_OSX
|
|
static gboolean
|
|
really_enable_npot (void)
|
|
{
|
|
/* OSX backend + ATI Radeon X1600 + NPOT texture + GL_REPEAT seems to crash
|
|
* http://bugzilla.openedhand.com/show_bug.cgi?id=929
|
|
*
|
|
* Temporary workaround until post 0.8 we rejig the features set up a
|
|
* little to allow the backend to overide.
|
|
*/
|
|
const char *gl_renderer;
|
|
const char *env_string;
|
|
|
|
/* Regardless of hardware, allow user to decide. */
|
|
env_string = g_getenv ("COGL_ENABLE_NPOT");
|
|
if (env_string != NULL)
|
|
return env_string[0] == '1';
|
|
|
|
gl_renderer = (char*)glGetString (GL_RENDERER);
|
|
if (strstr (gl_renderer, "ATI Radeon X1600") != NULL)
|
|
return FALSE;
|
|
|
|
return TRUE;
|
|
}
|
|
#endif
|
|
|
|
void
|
|
_cogl_features_init (void)
|
|
{
|
|
CoglFeatureFlags flags = 0;
|
|
const gchar *gl_extensions;
|
|
GLint max_clip_planes = 0;
|
|
GLint num_stencil_bits = 0;
|
|
gboolean fbo_ARB = FALSE;
|
|
gboolean fbo_EXT = FALSE;
|
|
const char *suffix;
|
|
|
|
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
|
|
|
|
flags = COGL_FEATURE_TEXTURE_READ_PIXELS;
|
|
|
|
gl_extensions = (const gchar*) glGetString (GL_EXTENSIONS);
|
|
|
|
if (cogl_check_extension ("GL_ARB_texture_non_power_of_two", gl_extensions))
|
|
{
|
|
#ifdef HAVE_CLUTTER_OSX
|
|
if (really_enable_npot ())
|
|
#endif
|
|
flags |= COGL_FEATURE_TEXTURE_NPOT;
|
|
}
|
|
|
|
#ifdef GL_YCBCR_MESA
|
|
if (cogl_check_extension ("GL_MESA_ycbcr_texture", gl_extensions))
|
|
{
|
|
flags |= COGL_FEATURE_TEXTURE_YUV;
|
|
}
|
|
#endif
|
|
|
|
if (cogl_check_extension ("GL_ARB_shader_objects", gl_extensions) &&
|
|
cogl_check_extension ("GL_ARB_vertex_shader", gl_extensions) &&
|
|
cogl_check_extension ("GL_ARB_fragment_shader", gl_extensions))
|
|
{
|
|
ctx->drv.pf_glCreateProgramObjectARB =
|
|
(COGL_PFNGLCREATEPROGRAMOBJECTARBPROC)
|
|
cogl_get_proc_address ("glCreateProgramObjectARB");
|
|
|
|
ctx->drv.pf_glCreateShaderObjectARB =
|
|
(COGL_PFNGLCREATESHADEROBJECTARBPROC)
|
|
cogl_get_proc_address ("glCreateShaderObjectARB");
|
|
|
|
ctx->drv.pf_glShaderSourceARB =
|
|
(COGL_PFNGLSHADERSOURCEARBPROC)
|
|
cogl_get_proc_address ("glShaderSourceARB");
|
|
|
|
ctx->drv.pf_glCompileShaderARB =
|
|
(COGL_PFNGLCOMPILESHADERARBPROC)
|
|
cogl_get_proc_address ("glCompileShaderARB");
|
|
|
|
ctx->drv.pf_glAttachObjectARB =
|
|
(COGL_PFNGLATTACHOBJECTARBPROC)
|
|
cogl_get_proc_address ("glAttachObjectARB");
|
|
|
|
ctx->drv.pf_glLinkProgramARB =
|
|
(COGL_PFNGLLINKPROGRAMARBPROC)
|
|
cogl_get_proc_address ("glLinkProgramARB");
|
|
|
|
ctx->drv.pf_glUseProgramObjectARB =
|
|
(COGL_PFNGLUSEPROGRAMOBJECTARBPROC)
|
|
cogl_get_proc_address ("glUseProgramObjectARB");
|
|
|
|
ctx->drv.pf_glGetUniformLocationARB =
|
|
(COGL_PFNGLGETUNIFORMLOCATIONARBPROC)
|
|
cogl_get_proc_address ("glGetUniformLocationARB");
|
|
|
|
ctx->drv.pf_glDeleteObjectARB =
|
|
(COGL_PFNGLDELETEOBJECTARBPROC)
|
|
cogl_get_proc_address ("glDeleteObjectARB");
|
|
|
|
ctx->drv.pf_glGetInfoLogARB =
|
|
(COGL_PFNGLGETINFOLOGARBPROC)
|
|
cogl_get_proc_address ("glGetInfoLogARB");
|
|
|
|
ctx->drv.pf_glGetObjectParameterivARB =
|
|
(COGL_PFNGLGETOBJECTPARAMETERIVARBPROC)
|
|
cogl_get_proc_address ("glGetObjectParameterivARB");
|
|
|
|
ctx->drv.pf_glUniform1fARB =
|
|
(COGL_PFNGLUNIFORM1FARBPROC)
|
|
cogl_get_proc_address ("glUniform1fARB");
|
|
|
|
ctx->drv.pf_glVertexAttribPointerARB =
|
|
(COGL_PFNGLVERTEXATTRIBPOINTERARBPROC)
|
|
cogl_get_proc_address ("glVertexAttribPointerARB");
|
|
|
|
ctx->drv.pf_glEnableVertexAttribArrayARB =
|
|
(COGL_PFNGLENABLEVERTEXATTRIBARRAYARBPROC)
|
|
cogl_get_proc_address ("glEnableVertexAttribArrayARB");
|
|
|
|
ctx->drv.pf_glDisableVertexAttribArrayARB =
|
|
(COGL_PFNGLDISABLEVERTEXATTRIBARRAYARBPROC)
|
|
cogl_get_proc_address ("glDisableVertexAttribArrayARB");
|
|
|
|
ctx->drv.pf_glUniform2fARB =
|
|
(COGL_PFNGLUNIFORM2FARBPROC)
|
|
cogl_get_proc_address ("glUniform2fARB");
|
|
|
|
ctx->drv.pf_glUniform3fARB =
|
|
(COGL_PFNGLUNIFORM3FARBPROC)
|
|
cogl_get_proc_address ("glUniform3fARB");
|
|
|
|
ctx->drv.pf_glUniform4fARB =
|
|
(COGL_PFNGLUNIFORM4FARBPROC)
|
|
cogl_get_proc_address ("glUniform4fARB");
|
|
|
|
ctx->drv.pf_glUniform1fvARB =
|
|
(COGL_PFNGLUNIFORM1FVARBPROC)
|
|
cogl_get_proc_address ("glUniform1fvARB");
|
|
|
|
ctx->drv.pf_glUniform2fvARB =
|
|
(COGL_PFNGLUNIFORM2FVARBPROC)
|
|
cogl_get_proc_address ("glUniform2fvARB");
|
|
|
|
ctx->drv.pf_glUniform3fvARB =
|
|
(COGL_PFNGLUNIFORM3FVARBPROC)
|
|
cogl_get_proc_address ("glUniform3fvARB");
|
|
|
|
ctx->drv.pf_glUniform4fvARB =
|
|
(COGL_PFNGLUNIFORM4FVARBPROC)
|
|
cogl_get_proc_address ("glUniform4fvARB");
|
|
|
|
ctx->drv.pf_glUniform1iARB =
|
|
(COGL_PFNGLUNIFORM1IARBPROC)
|
|
cogl_get_proc_address ("glUniform1iARB");
|
|
|
|
ctx->drv.pf_glUniform2iARB =
|
|
(COGL_PFNGLUNIFORM2IARBPROC)
|
|
cogl_get_proc_address ("glUniform2iARB");
|
|
|
|
ctx->drv.pf_glUniform3iARB =
|
|
(COGL_PFNGLUNIFORM3IARBPROC)
|
|
cogl_get_proc_address ("glUniform3iARB");
|
|
|
|
ctx->drv.pf_glUniform4iARB =
|
|
(COGL_PFNGLUNIFORM4IARBPROC)
|
|
cogl_get_proc_address ("glUniform4iARB");
|
|
|
|
ctx->drv.pf_glUniform1ivARB =
|
|
(COGL_PFNGLUNIFORM1IVARBPROC)
|
|
cogl_get_proc_address ("glUniform1ivARB");
|
|
|
|
ctx->drv.pf_glUniform2ivARB =
|
|
(COGL_PFNGLUNIFORM2IVARBPROC)
|
|
cogl_get_proc_address ("glUniform2ivARB");
|
|
|
|
ctx->drv.pf_glUniform3ivARB =
|
|
(COGL_PFNGLUNIFORM3IVARBPROC)
|
|
cogl_get_proc_address ("glUniform3ivARB");
|
|
|
|
ctx->drv.pf_glUniform4ivARB =
|
|
(COGL_PFNGLUNIFORM4IVARBPROC)
|
|
cogl_get_proc_address ("glUniform4ivARB");
|
|
|
|
ctx->drv.pf_glUniformMatrix2fvARB =
|
|
(COGL_PFNGLUNIFORMMATRIX2FVARBPROC)
|
|
cogl_get_proc_address ("glUniformMatrix2fvARB");
|
|
|
|
ctx->drv.pf_glUniformMatrix3fvARB =
|
|
(COGL_PFNGLUNIFORMMATRIX3FVARBPROC)
|
|
cogl_get_proc_address ("glUniformMatrix3fvARB");
|
|
|
|
ctx->drv.pf_glUniformMatrix4fvARB =
|
|
(COGL_PFNGLUNIFORMMATRIX4FVARBPROC)
|
|
cogl_get_proc_address ("glUniformMatrix4fvARB");
|
|
|
|
if (ctx->drv.pf_glCreateProgramObjectARB &&
|
|
ctx->drv.pf_glCreateShaderObjectARB &&
|
|
ctx->drv.pf_glShaderSourceARB &&
|
|
ctx->drv.pf_glCompileShaderARB &&
|
|
ctx->drv.pf_glAttachObjectARB &&
|
|
ctx->drv.pf_glLinkProgramARB &&
|
|
ctx->drv.pf_glUseProgramObjectARB &&
|
|
ctx->drv.pf_glGetUniformLocationARB &&
|
|
ctx->drv.pf_glDeleteObjectARB &&
|
|
ctx->drv.pf_glGetInfoLogARB &&
|
|
ctx->drv.pf_glGetObjectParameterivARB &&
|
|
ctx->drv.pf_glUniform1fARB &&
|
|
ctx->drv.pf_glUniform2fARB &&
|
|
ctx->drv.pf_glUniform3fARB &&
|
|
ctx->drv.pf_glUniform4fARB &&
|
|
ctx->drv.pf_glUniform1fvARB &&
|
|
ctx->drv.pf_glUniform2fvARB &&
|
|
ctx->drv.pf_glUniform3fvARB &&
|
|
ctx->drv.pf_glUniform4fvARB &&
|
|
ctx->drv.pf_glUniform1iARB &&
|
|
ctx->drv.pf_glUniform2iARB &&
|
|
ctx->drv.pf_glUniform3iARB &&
|
|
ctx->drv.pf_glUniform4iARB &&
|
|
ctx->drv.pf_glUniform1ivARB &&
|
|
ctx->drv.pf_glUniform2ivARB &&
|
|
ctx->drv.pf_glUniform3ivARB &&
|
|
ctx->drv.pf_glUniform4ivARB &&
|
|
ctx->drv.pf_glUniformMatrix2fvARB &&
|
|
ctx->drv.pf_glUniformMatrix3fvARB &&
|
|
ctx->drv.pf_glUniformMatrix4fvARB &&
|
|
ctx->drv.pf_glVertexAttribPointerARB &&
|
|
ctx->drv.pf_glEnableVertexAttribArrayARB &&
|
|
ctx->drv.pf_glDisableVertexAttribArrayARB)
|
|
flags |= COGL_FEATURE_SHADERS_GLSL;
|
|
}
|
|
|
|
fbo_ARB = cogl_check_extension ("GL_ARB_framebuffer_object", gl_extensions);
|
|
if (fbo_ARB)
|
|
suffix = "";
|
|
else
|
|
{
|
|
fbo_EXT = cogl_check_extension ("GL_EXT_framebuffer_object", gl_extensions);
|
|
if (fbo_EXT)
|
|
suffix = "EXT";
|
|
}
|
|
|
|
if (fbo_ARB || fbo_EXT)
|
|
{
|
|
CoglGLSymbolTableEntry symbol_table[] = {
|
|
{"glGenRenderbuffers", &ctx->drv.pf_glGenRenderbuffers},
|
|
{"glDeleteRenderbuffers", &ctx->drv.pf_glDeleteRenderbuffers},
|
|
{"glBindRenderbuffer", &ctx->drv.pf_glBindRenderbuffer},
|
|
{"glRenderbufferStorage", &ctx->drv.pf_glRenderbufferStorage},
|
|
{"glGenFramebuffers", &ctx->drv.pf_glGenFramebuffers},
|
|
{"glBindFramebuffer", &ctx->drv.pf_glBindFramebuffer},
|
|
{"glFramebufferTexture2D", &ctx->drv.pf_glFramebufferTexture2D},
|
|
{"glFramebufferRenderbuffer", &ctx->drv.pf_glFramebufferRenderbuffer},
|
|
{"glCheckFramebufferStatus", &ctx->drv.pf_glCheckFramebufferStatus},
|
|
{"glDeleteFramebuffers", &ctx->drv.pf_glDeleteFramebuffers},
|
|
{"glGenerateMipmap", &ctx->drv.pf_glGenerateMipmap},
|
|
{NULL, NULL}
|
|
};
|
|
|
|
if (_cogl_resolve_gl_symbols (symbol_table, suffix))
|
|
flags |= COGL_FEATURE_OFFSCREEN;
|
|
}
|
|
|
|
if (cogl_check_extension ("GL_EXT_framebuffer_blit", gl_extensions))
|
|
{
|
|
ctx->drv.pf_glBlitFramebufferEXT =
|
|
(COGL_PFNGLBLITFRAMEBUFFEREXTPROC)
|
|
cogl_get_proc_address ("glBlitFramebufferEXT");
|
|
|
|
if (ctx->drv.pf_glBlitFramebufferEXT)
|
|
flags |= COGL_FEATURE_OFFSCREEN_BLIT;
|
|
}
|
|
|
|
if (cogl_check_extension ("GL_EXT_framebuffer_multisample", gl_extensions))
|
|
{
|
|
ctx->drv.pf_glRenderbufferStorageMultisampleEXT =
|
|
(COGL_PFNGLRENDERBUFFERSTORAGEMULTISAMPLEEXTPROC)
|
|
cogl_get_proc_address ("glRenderbufferStorageMultisampleEXT");
|
|
|
|
if (ctx->drv.pf_glRenderbufferStorageMultisampleEXT)
|
|
flags |= COGL_FEATURE_OFFSCREEN_MULTISAMPLE;
|
|
}
|
|
|
|
GE( glGetIntegerv (GL_STENCIL_BITS, &num_stencil_bits) );
|
|
/* We need at least three stencil bits to combine clips */
|
|
if (num_stencil_bits > 2)
|
|
flags |= COGL_FEATURE_STENCIL_BUFFER;
|
|
|
|
GE( glGetIntegerv (GL_MAX_CLIP_PLANES, &max_clip_planes) );
|
|
if (max_clip_planes >= 4)
|
|
flags |= COGL_FEATURE_FOUR_CLIP_PLANES;
|
|
|
|
if (cogl_check_extension ("GL_ARB_vertex_buffer_object", gl_extensions))
|
|
{
|
|
ctx->drv.pf_glGenBuffersARB =
|
|
(COGL_PFNGLGENBUFFERSARBPROC)
|
|
cogl_get_proc_address ("glGenBuffersARB");
|
|
ctx->drv.pf_glBindBufferARB =
|
|
(COGL_PFNGLBINDBUFFERARBPROC)
|
|
cogl_get_proc_address ("glBindBufferARB");
|
|
ctx->drv.pf_glBufferDataARB =
|
|
(COGL_PFNGLBUFFERDATAARBPROC)
|
|
cogl_get_proc_address ("glBufferDataARB");
|
|
ctx->drv.pf_glBufferSubDataARB =
|
|
(COGL_PFNGLBUFFERSUBDATAARBPROC)
|
|
cogl_get_proc_address ("glBufferSubDataARB");
|
|
ctx->drv.pf_glDeleteBuffersARB =
|
|
(COGL_PFNGLDELETEBUFFERSARBPROC)
|
|
cogl_get_proc_address ("glDeleteBuffersARB");
|
|
ctx->drv.pf_glMapBufferARB =
|
|
(COGL_PFNGLMAPBUFFERARBPROC)
|
|
cogl_get_proc_address ("glMapBufferARB");
|
|
ctx->drv.pf_glUnmapBufferARB =
|
|
(COGL_PFNGLUNMAPBUFFERARBPROC)
|
|
cogl_get_proc_address ("glUnmapBufferARB");
|
|
if (ctx->drv.pf_glGenBuffersARB
|
|
&& ctx->drv.pf_glBindBufferARB
|
|
&& ctx->drv.pf_glBufferDataARB
|
|
&& ctx->drv.pf_glBufferSubDataARB
|
|
&& ctx->drv.pf_glDeleteBuffersARB
|
|
&& ctx->drv.pf_glMapBufferARB
|
|
&& ctx->drv.pf_glUnmapBufferARB)
|
|
flags |= COGL_FEATURE_VBOS;
|
|
}
|
|
|
|
/* These should always be available because they are defined in GL
|
|
1.2, but we can't call it directly because under Windows
|
|
functions > 1.1 aren't exported */
|
|
ctx->drv.pf_glDrawRangeElements =
|
|
(COGL_PFNGLDRAWRANGEELEMENTSPROC)
|
|
cogl_get_proc_address ("glDrawRangeElements");
|
|
ctx->drv.pf_glActiveTexture =
|
|
(COGL_PFNGLACTIVETEXTUREPROC)
|
|
cogl_get_proc_address ("glActiveTexture");
|
|
ctx->drv.pf_glClientActiveTexture =
|
|
(COGL_PFNGLCLIENTACTIVETEXTUREPROC)
|
|
cogl_get_proc_address ("glClientActiveTexture");
|
|
|
|
ctx->drv.pf_glBlendEquation =
|
|
(COGL_PFNGLBLENDEQUATIONPROC)
|
|
cogl_get_proc_address ("glBlendEquation");
|
|
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;
|
|
}
|
|
|