Mesa (arb_fbo): demos: revamp the fbotexture.c demo
Brian Paul
brianp at kemper.freedesktop.org
Wed Jan 21 23:32:23 UTC 2009
Module: Mesa
Branch: arb_fbo
Commit: 14285e62b8c396fa263f6c14745ce4eb4a0ad5f3
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=14285e62b8c396fa263f6c14745ce4eb4a0ad5f3
Author: Brian Paul <brianp at vmware.com>
Date: Wed Jan 21 15:58:43 2009 -0700
demos: revamp the fbotexture.c demo
Try making depth/stencil attachments in two different ways.
Check for GL errors and GL_FRAMEBUFFER_UNSUPPORTED status to be more robust.
Reorganize the code a bit to make it clearer.
---
progs/tests/fbotexture.c | 367 +++++++++++++++++++++++++++++-----------------
1 files changed, 232 insertions(+), 135 deletions(-)
diff --git a/progs/tests/fbotexture.c b/progs/tests/fbotexture.c
index ced58d3..1f7c45f 100644
--- a/progs/tests/fbotexture.c
+++ b/progs/tests/fbotexture.c
@@ -32,11 +32,12 @@ static int TexWidth = 512, TexHeight = 512;
static GLuint MyFB;
static GLuint TexObj;
-static GLuint DepthRB, StencilRB;
+static GLuint DepthRB = 0, StencilRB = 0;
static GLboolean Anim = GL_FALSE;
static GLfloat Rot = 0.0;
static GLboolean UsePackedDepthStencil = GL_FALSE;
static GLboolean UsePackedDepthStencilBoth = GL_FALSE;
+static GLboolean Use_ARB_fbo = GL_FALSE;
static GLuint TextureLevel = 0; /* which texture level to render to */
static GLenum TexIntFormat = GL_RGB; /* either GL_RGB or GL_RGBA */
static GLboolean Cull = GL_FALSE;
@@ -249,8 +250,7 @@ CleanUp(void)
glDeleteRenderbuffersEXT(1, &DepthRB);
#endif
#if STENCIL
- if (!UsePackedDepthStencil && !UsePackedDepthStencilBoth)
- glDeleteRenderbuffersEXT(1, &StencilRB);
+ glDeleteRenderbuffersEXT(1, &StencilRB);
#endif
glDeleteFramebuffersEXT(1, &MyFB);
@@ -295,32 +295,129 @@ Key(unsigned char key, int x, int y)
}
-static void
-Usage(void)
+/**
+ * Attach depth and stencil renderbuffer(s) to the given framebuffer object.
+ * \param tryDepthStencil if true, try to use a combined depth+stencil buffer
+ * \param bindDepthStencil if true, and tryDepthStencil is true, bind with
+ * the GL_DEPTH_STENCIL_ATTACHMENT target.
+ * \return GL_TRUE for success, GL_FALSE for failure
+ */
+static GLboolean
+AttachDepthAndStencilBuffers(GLuint fbo,
+ GLsizei width, GLsizei height,
+ GLboolean tryDepthStencil,
+ GLboolean bindDepthStencil,
+ GLuint *depthRbOut, GLuint *stencilRbOut)
{
- printf("Usage:\n");
- printf(" a Toggle animation\n");
- printf(" s/s Step/rotate\n");
- printf(" c Toggle back-face culling\n");
- printf(" w Toggle wireframe mode (front-face only)\n");
- printf(" Esc Exit\n");
+ GLenum status;
+
+ *depthRbOut = *stencilRbOut = 0;
+
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo);
+
+ if (tryDepthStencil) {
+ GLuint rb;
+
+ glGenRenderbuffersEXT(1, &rb);
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT,
+ GL_DEPTH24_STENCIL8_EXT,
+ width, height);
+ if (glGetError())
+ return GL_FALSE;
+
+ if (bindDepthStencil) {
+ /* attach to both depth and stencil at once */
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
+ GL_DEPTH_STENCIL_ATTACHMENT,
+ GL_RENDERBUFFER_EXT, rb);
+ if (glGetError())
+ return GL_FALSE;
+ }
+ else {
+ /* attach to depth attachment point */
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
+ GL_DEPTH_ATTACHMENT_EXT,
+ GL_RENDERBUFFER_EXT, rb);
+ if (glGetError())
+ return GL_FALSE;
+
+ /* and attach to stencil attachment point */
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
+ GL_STENCIL_ATTACHMENT_EXT,
+ GL_RENDERBUFFER_EXT, rb);
+ if (glGetError())
+ return GL_FALSE;
+ }
+
+ status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+ if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
+ return GL_FALSE;
+
+ *depthRbOut = *stencilRbOut = rb;
+ return GL_TRUE;
+ }
+
+ /* just depth renderbuffer */
+ {
+ GLuint rb;
+
+ glGenRenderbuffersEXT(1, &rb);
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT,
+ GL_DEPTH_COMPONENT,
+ width, height);
+ if (glGetError())
+ return GL_FALSE;
+
+ /* attach to depth attachment point */
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
+ GL_DEPTH_ATTACHMENT_EXT,
+ GL_RENDERBUFFER_EXT, rb);
+ if (glGetError())
+ return GL_FALSE;
+
+ status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+ if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
+ return GL_FALSE;
+
+ *depthRbOut = rb;
+ }
+
+ /* just stencil renderbuffer */
+ {
+ GLuint rb;
+
+ glGenRenderbuffersEXT(1, &rb);
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb);
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT,
+ GL_STENCIL_INDEX,
+ width, height);
+ if (glGetError())
+ return GL_FALSE;
+
+ /* attach to depth attachment point */
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
+ GL_STENCIL_ATTACHMENT_EXT,
+ GL_RENDERBUFFER_EXT, rb);
+ if (glGetError())
+ return GL_FALSE;
+
+ status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+ if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
+ return GL_FALSE;
+
+ *stencilRbOut = rb;
+ }
+
+ return GL_TRUE;
}
static void
-Init(int argc, char *argv[])
+ParseArgs(int argc, char *argv[])
{
- static const GLfloat mat[4] = { 1.0, 0.5, 0.5, 1.0 };
- GLboolean ARB_fbo = glutExtensionSupported("GL_ARB_framebuffer_object");
- GLboolean Use_ARB_fbo = GL_FALSE;
GLint i;
- GLint sizeFudge = 0;
-
- if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
- printf("GL_EXT_framebuffer_object not found!\n");
- exit(0);
- }
-
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-ds") == 0) {
if (!glutExtensionSupported("GL_EXT_packed_depth_stencil")) {
@@ -343,7 +440,7 @@ Init(int argc, char *argv[])
printf("Using GL_EXT_packed_depth_stencil and GL_DEPTH_STENCIL attachment point\n");
}
else if (strcmp(argv[i], "-arb") == 0) {
- if (!ARB_fbo) {
+ if (!glutExtensionSupported("GL_ARB_framebuffer_object")) {
printf("Sorry, GL_ARB_framebuffer object not supported!\n");
}
else {
@@ -354,141 +451,138 @@ Init(int argc, char *argv[])
printf("Unknown option: %s\n", argv[i]);
}
}
+}
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
-
- /* gen framebuffer id, delete it, do some assertions, just for testing */
- glGenFramebuffersEXT(1, &MyFB);
- assert(MyFB);
- assert(!glIsFramebufferEXT(MyFB));
- if (!ARB_fbo) {
- glDeleteFramebuffersEXT(1, &MyFB);
- assert(!glIsFramebufferEXT(MyFB));
- }
- /* Note, continue to use MyFB below */
-
- glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
- assert(glIsFramebufferEXT(MyFB));
- glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &i);
- assert(i == MyFB);
- /* Make texture object/image */
- glGenTextures(1, &TexObj);
- glBindTexture(TexTarget, TexObj);
- /* make two image levels */
- glTexImage2D(TexTarget, 0, TexIntFormat, TexWidth, TexHeight, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- glTexImage2D(TexTarget, 1, TexIntFormat, TexWidth/2, TexHeight/2, 0,
- GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- TexWidth = TexWidth >> TextureLevel;
- TexHeight = TexHeight >> TextureLevel;
-
- glTexParameteri(TexTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexParameteri(TexTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
- glTexParameteri(TexTarget, GL_TEXTURE_BASE_LEVEL, TextureLevel);
- glTexParameteri(TexTarget, GL_TEXTURE_MAX_LEVEL, TextureLevel);
-
- CheckError(__LINE__);
+/*
+ * Make FBO to render into given texture.
+ */
+static GLuint
+MakeFBO_RenderTexture(GLuint TexObj)
+{
+ GLuint fb;
+ GLint sizeFudge = 0;
+ glGenFramebuffersEXT(1, &fb);
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fb);
/* Render color to texture */
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
TexTarget, TexObj, TextureLevel);
-
if (Use_ARB_fbo) {
/* use a smaller depth buffer to see what happens */
- sizeFudge = 30;
+ sizeFudge = 90;
}
-#if DEPTH
- /* make depth renderbuffer */
- glGenRenderbuffersEXT(1, &DepthRB);
- assert(DepthRB);
- assert(!glIsRenderbufferEXT(DepthRB));
- glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRB);
- assert(glIsRenderbufferEXT(DepthRB));
- if (UsePackedDepthStencil || UsePackedDepthStencilBoth)
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_STENCIL_EXT,
- TexWidth - sizeFudge, TexHeight - sizeFudge);
- else
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT,
- TexWidth - sizeFudge, TexHeight - sizeFudge);
- CheckError(__LINE__);
- glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
- GL_RENDERBUFFER_DEPTH_SIZE_EXT, &i);
- CheckError(__LINE__);
- printf("Depth renderbuffer size = %d bits\n", i);
- assert(i > 0);
-
- /* attach DepthRB to MyFB */
- if (UsePackedDepthStencilBoth) {
- /* attach depth/stencil buffer to both attachment points at once */
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
- GL_DEPTH_STENCIL_ATTACHMENT,
- GL_RENDERBUFFER_EXT, DepthRB);
- }
- else {
- /* depth attachment only */
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
- GL_DEPTH_ATTACHMENT_EXT,
- GL_RENDERBUFFER_EXT, DepthRB);
+ /* Setup depth and stencil buffers */
+ {
+ GLboolean b;
+ b = AttachDepthAndStencilBuffers(fb,
+ TexWidth - sizeFudge,
+ TexHeight - sizeFudge,
+ UsePackedDepthStencil,
+ UsePackedDepthStencilBoth,
+ &DepthRB, &StencilRB);
+ if (!b) {
+ /* try !UsePackedDepthStencil */
+ b = AttachDepthAndStencilBuffers(fb,
+ TexWidth - sizeFudge,
+ TexHeight - sizeFudge,
+ !UsePackedDepthStencil,
+ UsePackedDepthStencilBoth,
+ &DepthRB, &StencilRB);
+ }
+ if (!b) {
+ printf("Unable to create/attach depth and stencil renderbuffers "
+ " to FBO!\n");
+ exit(1);
+ }
}
-#endif
- CheckError(__LINE__);
+ /* queries */
+ {
+ GLint bits, w, h;
+
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRB);
+ glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
+ GL_RENDERBUFFER_WIDTH_EXT, &w);
+ glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
+ GL_RENDERBUFFER_HEIGHT_EXT, &h);
+ printf("Color/Texture size: %d x %d\n", TexWidth, TexHeight);
+ printf("Depth buffer size: %d x %d\n", w, h);
+
+ glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
+ GL_RENDERBUFFER_DEPTH_SIZE_EXT, &bits);
+ printf("Depth renderbuffer size = %d bits\n", bits);
-#if STENCIL
- if (UsePackedDepthStencil) {
- /* DepthRb is a combined depth/stencil renderbuffer */
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
- GL_STENCIL_ATTACHMENT_EXT,
- GL_RENDERBUFFER_EXT, DepthRB);
- }
- else if (UsePackedDepthStencilBoth) {
- /* nothing: we did a combined depth+stencil attachment above */
- }
- else {
- /* make stencil renderbuffer */
- glGenRenderbuffersEXT(1, &StencilRB);
- assert(StencilRB);
- assert(!glIsRenderbufferEXT(StencilRB));
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, StencilRB);
- assert(glIsRenderbufferEXT(StencilRB));
- glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX,
- TexWidth, TexHeight);
- /* attach StencilRB to MyFB */
- glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT,
- GL_STENCIL_ATTACHMENT_EXT,
- GL_RENDERBUFFER_EXT, StencilRB);
+ glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
+ GL_RENDERBUFFER_STENCIL_SIZE_EXT, &bits);
+ printf("Stencil renderbuffer size = %d bits\n", bits);
}
- glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
- GL_RENDERBUFFER_STENCIL_SIZE_EXT, &i);
- CheckError(__LINE__);
- printf("Stencil renderbuffer size = %d bits\n", i);
- assert(i > 0);
-#endif
-
- CheckError(__LINE__);
- /* bind regular framebuffer */
+ /* bind the regular framebuffer */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+ return fb;
+}
+
+
+static void
+Init(void)
+{
+ if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
+ printf("GL_EXT_framebuffer_object not found!\n");
+ exit(0);
+ }
+
+ printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
/* lighting */
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat);
+ {
+ static const GLfloat mat[4] = { 1.0, 0.5, 0.5, 1.0 };
+ glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat);
+ }
- /* queries */
+ /*
+ * Make texture object/image (we'll render into this texture)
+ */
{
- GLint w, h;
- glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRB);
- glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
- GL_RENDERBUFFER_WIDTH_EXT, &w);
- glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
- GL_RENDERBUFFER_HEIGHT_EXT, &h);
- printf("Color/Texture size: %d x %d\n", TexWidth, TexHeight);
- printf("Depth buffer size: %d x %d\n", w, h);
+ glGenTextures(1, &TexObj);
+ glBindTexture(TexTarget, TexObj);
+
+ /* make two image levels */
+ glTexImage2D(TexTarget, 0, TexIntFormat, TexWidth, TexHeight, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ glTexImage2D(TexTarget, 1, TexIntFormat, TexWidth/2, TexHeight/2, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ TexWidth = TexWidth >> TextureLevel;
+ TexHeight = TexHeight >> TextureLevel;
+
+ glTexParameteri(TexTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(TexTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameteri(TexTarget, GL_TEXTURE_BASE_LEVEL, TextureLevel);
+ glTexParameteri(TexTarget, GL_TEXTURE_MAX_LEVEL, TextureLevel);
+ glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
+
+ MyFB = MakeFBO_RenderTexture(TexObj);
+}
+
+
+static void
+Usage(void)
+{
+ printf("Usage:\n");
+ printf(" -ds Use combined depth/stencil renderbuffer\n");
+ printf(" -arb Try GL_ARB_framebuffer_object's mismatched buffer sizes\n");
+ printf(" -ds2 Tye GL_ARB_framebuffer_object's GL_DEPTH_STENCIL_ATTACHMENT\n");
+ printf("Keys:\n");
+ printf(" a Toggle animation\n");
+ printf(" s/s Step/rotate\n");
+ printf(" c Toggle back-face culling\n");
+ printf(" w Toggle wireframe mode (front-face only)\n");
+ printf(" Esc Exit\n");
}
@@ -505,8 +599,11 @@ main(int argc, char *argv[])
glutDisplayFunc(Display);
if (Anim)
glutIdleFunc(Idle);
- Init(argc, argv);
+
+ ParseArgs(argc, argv);
+ Init();
Usage();
+
glutMainLoop();
return 0;
}
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