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webgl: use DEPTH_STENCIL_ATTACHMENT

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WebGL doesn't allow you to separately attach buffers to the
STENCIL_ATTACHMENT and DEPTH_ATTACHMENT framebuffer attachment points
and instead requires you to use the DEPTH_STENCIL_ATTACHMENT whenever
you want a depth and stencil buffer.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit ec7b6360c9c4e45e0b113f9dca7bb1502e7e93be)
This commit is contained in:
Robert Bragg 2013-05-11 22:14:00 +01:00
parent 3fc1a39db8
commit 29f08ef124
1 changed files with 26 additions and 3 deletions
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29
cogl/driver/gl/cogl-framebuffer-gl.c
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@ -65,6 +65,9 @@
#ifndef GL_DEPTH_ATTACHMENT
#define GL_DEPTH_ATTACHMENT 0x8D00
#endif
#ifndef GL_DEPTH_STENCIL_ATTACHMENT
#define GL_DEPTH_STENCIL_ATTACHMENT 0x821A
#endif
#ifndef GL_DEPTH_COMPONENT16
#define GL_DEPTH_COMPONENT16 0x81A5
#endif
@ -459,6 +462,11 @@ try_creating_renderbuffers (CoglContext *ctx,
{
GLenum format;
/* WebGL adds a GL_DEPTH_STENCIL_ATTACHMENT and requires that we
* use the GL_DEPTH_STENCIL format. */
#ifdef HAVE_COGL_WEBGL
format = GL_DEPTH_STENCIL;
#else
/* Although GL_OES_packed_depth_stencil is mostly equivalent to
* GL_EXT_packed_depth_stencil, one notable difference is that
* GL_OES_packed_depth_stencil doesn't allow GL_DEPTH_STENCIL to
@ -475,6 +483,7 @@ try_creating_renderbuffers (CoglContext *ctx,
NULL);
format = GL_DEPTH24_STENCIL8;
}
#endif
/* Create a renderbuffer for depth and stenciling */
GE (ctx, glGenRenderbuffers (1, &gl_depth_stencil_handle));
@ -488,6 +497,14 @@ try_creating_renderbuffers (CoglContext *ctx,
GE (ctx, glRenderbufferStorage (GL_RENDERBUFFER, format,
width, height));
GE (ctx, glBindRenderbuffer (GL_RENDERBUFFER, 0));
#ifdef HAVE_COGL_WEBGL
GE (ctx, glFramebufferRenderbuffer (GL_FRAMEBUFFER,
GL_DEPTH_STENCIL_ATTACHMENT,
GL_RENDERBUFFER,
gl_depth_stencil_handle));
#else
GE (ctx, glFramebufferRenderbuffer (GL_FRAMEBUFFER,
GL_STENCIL_ATTACHMENT,
GL_RENDERBUFFER,
@ -496,6 +513,7 @@ try_creating_renderbuffers (CoglContext *ctx,
GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER,
gl_depth_stencil_handle));
#endif
renderbuffers =
g_list_prepend (renderbuffers,
GUINT_TO_POINTER (gl_depth_stencil_handle));
@ -768,9 +786,14 @@ _cogl_offscreen_gl_allocate (CoglOffscreen *offscreen,
flags = ctx->last_offscreen_allocate_flags,
gl_framebuffer)) ||
((ctx->private_feature_flags &
(COGL_PRIVATE_FEATURE_EXT_PACKED_DEPTH_STENCIL |
COGL_PRIVATE_FEATURE_OES_PACKED_DEPTH_STENCIL)) &&
(
/* NB: WebGL introduces a DEPTH_STENCIL_ATTACHMENT and doesn't
* need an extension to handle _FLAG_DEPTH_STENCIL */
#ifndef HAVE_COGL_WEBGL
(ctx->private_feature_flags
& (COGL_PRIVATE_FEATURE_EXT_PACKED_DEPTH_STENCIL |
COGL_PRIVATE_FEATURE_OES_PACKED_DEPTH_STENCIL)) &&
#endif
try_creating_fbo (ctx,
offscreen->texture,
offscreen->texture_level,