diff options
Diffstat (limited to 'cogl/driver/gl/cogl-framebuffer-gl.c')
| -rw-r--r-- | cogl/driver/gl/cogl-framebuffer-gl.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/cogl/driver/gl/cogl-framebuffer-gl.c b/cogl/driver/gl/cogl-framebuffer-gl.c index ce2b5b57..5ef84867 100644 --- a/cogl/driver/gl/cogl-framebuffer-gl.c +++ b/cogl/driver/gl/cogl-framebuffer-gl.c @@ -255,6 +255,35 @@ _cogl_framebuffer_gl_bind (CoglFramebuffer *framebuffer, GLenum target) /* glBindFramebuffer is an an extension with OpenGL ES 1.1 */ if (cogl_has_feature (ctx, COGL_FEATURE_ID_OFFSCREEN)) GE (ctx, glBindFramebuffer (target, 0)); + + /* Initialise the glDrawBuffer state the first time the context + * is bound to the default framebuffer. If the winsys is using a + * surfaceless context for the initial make current then the + * default draw buffer will be GL_NONE so we need to correct + * that. We can't do it any earlier because binding GL_BACK when + * there is no default framebuffer won't work */ + if (!ctx->was_bound_to_onscreen) + { + if (ctx->glDrawBuffer) + { + GE (ctx, glDrawBuffer (GL_BACK)); + } + else if (ctx->glDrawBuffers) + { + /* glDrawBuffer isn't available on GLES 3.0 so we need + * to be able to use glDrawBuffers as well. On GLES 2 + * neither is available but the state should always be + * GL_BACK anyway so we don't need to set anything. On + * desktop GL this must be GL_BACK_LEFT instead of + * GL_BACK but as this code path will only be hit for + * GLES we can just use GL_BACK. */ + static const GLenum buffers[] = { GL_BACK }; + + GE (ctx, glDrawBuffers (G_N_ELEMENTS (buffers), buffers)); + } + + ctx->was_bound_to_onscreen = TRUE; + } } } |