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Diffstat (limited to 'progs/demos/fbo_firecube.c')
-rw-r--r--progs/demos/fbo_firecube.c36
1 files changed, 28 insertions, 8 deletions
diff --git a/progs/demos/fbo_firecube.c b/progs/demos/fbo_firecube.c
index 4e42924a09..b3f7e00e5a 100644
--- a/progs/demos/fbo_firecube.c
+++ b/progs/demos/fbo_firecube.c
@@ -938,7 +938,14 @@ reshape(int width, int height)
static void
init_fbotexture()
{
+ static const GLenum depthFormats[] = {
+ GL_DEPTH_COMPONENT,
+ GL_DEPTH_COMPONENT16,
+ GL_DEPTH_COMPONENT32
+ };
+ static int numDepthFormats = sizeof(depthFormats) / sizeof(depthFormats[0]);
GLint i;
+ GLenum stat;
/* gen framebuffer id, delete it, do some assertions, just for testing */
glGenFramebuffersEXT(1, &MyFB);
@@ -969,18 +976,31 @@ init_fbotexture()
/* make depth renderbuffer */
glGenRenderbuffersEXT(1, &DepthRB);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRB);
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16,
- TexWidth, TexHeight);
- CheckError(__LINE__);
+ /* we may have to try several formats */
+ for (i = 0; i < numDepthFormats; i++) {
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, depthFormats[i],
+ TexWidth, TexHeight);
+ CheckError(__LINE__);
+
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
+ GL_RENDERBUFFER_EXT, DepthRB);
+ CheckError(__LINE__);
+ stat = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+ if (stat == GL_FRAMEBUFFER_COMPLETE_EXT) {
+ break;
+ }
+ }
+
+ if (stat != GL_FRAMEBUFFER_COMPLETE_EXT) {
+ fprintf(stderr, "Error: unable to get usable FBO combination!\n");
+ exit(1);
+ }
+
glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
- GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i);
+ GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i);
CheckError(__LINE__);
printf("Depth renderbuffer size = %d bits\n", i);
- /* attach DepthRB to MyFB */
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
- GL_RENDERBUFFER_EXT, DepthRB);
- CheckError(__LINE__);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
/*