progs/tests: add another FBO test to exercise a RGBA vs. Z texture bug

See comments in file for more details.

3 files changed, 233 insertions, 0 deletions

diff --git a/progs/tests/Makefile b/progs/tests/Makefile
index 836396b249..a38f411def 100644
--- a/progs/tests/Makefile
+++ b/progs/tests/Makefile
@@ -48,6 +48,7 @@ SOURCES = \
 	floattex.c \
 	fbotest1.c \
 	fbotest2.c \
+	fbotest3.c \
 	fillrate.c \
 	fog.c \
 	fogcoord.c \
diff --git a/progs/tests/SConscript b/progs/tests/SConscript
index e2c6538288..0a11b965f7 100644
--- a/progs/tests/SConscript
+++ b/progs/tests/SConscript
@@ -51,6 +51,7 @@ progs = [
     'ext422square',
     'fbotest1',
     'fbotest2',
+    'fbotest3',
     'fillrate',
     'floattex',
     'fog',
diff --git a/progs/tests/fbotest3.c b/progs/tests/fbotest3.c
new file mode 100644
index 0000000000..8e288b38b8
--- /dev/null
+++ b/progs/tests/fbotest3.c
@@ -0,0 +1,231 @@
+/*
+ * Test GL_EXT_framebuffer_object
+ * Like fbotest2.c but use a texture for the Z buffer / renderbuffer.
+ * Note: the Z texture is never resized so that limits what can be
+ * rendered if the window is resized.
+ *
+ * This tests a bug reported by Christoph Bumiller on 1 Feb 2010
+ * on mesa3d-dev.
+ *
+ * XXX this should be made into a piglit test.
+ *
+ * Brian Paul
+ * 1 Feb 2010
+ */
+
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+
+
+static int Win = 0;
+static int Width = 400, Height = 400;
+static GLuint Tex = 0;
+static GLuint MyFB, ColorRb, DepthRb;
+static GLboolean Animate = GL_FALSE;
+static GLfloat Rotation = 0.0;
+
+
+static void
+CheckError(int line)
+{
+   GLenum err = glGetError();
+   if (err) {
+      printf("fbotest3: GL Error 0x%x at line %d\n", (int) err, line);
+   }
+}
+
+
+static void
+Display( void )
+{
+   GLubyte *buffer = malloc(Width * Height * 4);
+   GLenum status;
+
+   CheckError(__LINE__);
+
+   /* draw to user framebuffer */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
+   glDrawBuffer(GL_COLOR_ATTACHMENT1_EXT);
+   glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
+
+   status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+   if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      printf("fbotest3: Error: Framebuffer is incomplete!!!\n");
+   }
+
+   CheckError(__LINE__);
+
+   glClearColor(0.5, 0.5, 1.0, 0.0);
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   glEnable(GL_DEPTH_TEST);
+   glEnable(GL_LIGHTING);
+   glEnable(GL_LIGHT0);
+
+   glPushMatrix();
+   glRotatef(30.0, 1, 0, 0);
+   glRotatef(Rotation, 0, 1, 0);
+   glutSolidTeapot(2.0);
+   glPopMatrix();
+
+   /* read from user framebuffer */
+   glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+
+   /* draw to window */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+   glDisable(GL_DEPTH_TEST);  /* in case window has depth buffer */
+   glWindowPos2iARB(0, 0);
+   glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+
+   free(buffer);
+   glutSwapBuffers();
+   CheckError(__LINE__);
+}
+
+
+static void
+Reshape( int width, int height )
+{
+   float ar = (float) width / (float) height;
+
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glFrustum( -ar, ar, -1.0, 1.0, 5.0, 25.0 );
+
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef( 0.0, 0.0, -15.0 );
+
+   glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ColorRb);
+   glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, width, height);
+
+   Width = width;
+   Height = height;
+}
+
+
+static void
+CleanUp(void)
+{
+   glDeleteFramebuffersEXT(1, &MyFB);
+   glDeleteRenderbuffersEXT(1, &ColorRb);
+   glDeleteRenderbuffersEXT(1, &DepthRb);
+   glDeleteTextures(1, &Tex);
+   assert(!glIsFramebufferEXT(MyFB));
+   assert(!glIsRenderbufferEXT(ColorRb));
+   assert(!glIsRenderbufferEXT(DepthRb));
+   glutDestroyWindow(Win);
+   exit(0);
+}
+
+
+static void
+Idle(void)
+{
+   Rotation = glutGet(GLUT_ELAPSED_TIME) * 0.1;
+   glutPostRedisplay();
+}
+
+
+static void
+Key( unsigned char key, int x, int y )
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+   case 'a':
+      Animate = !Animate;
+      if (Animate)
+         glutIdleFunc(Idle);
+      else
+         glutIdleFunc(NULL);
+      break;
+   case 27:
+      CleanUp();
+      break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+Init( void )
+{
+   if (!glutExtensionSupported("GL_EXT_framebuffer_object")) {
+      printf("fbotest3: GL_EXT_framebuffer_object not found!\n");
+      exit(0);
+   }
+   printf("fbotest3: GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+
+   /* create initial tex obj as an RGBA texture */
+   glGenTextures(1, &Tex);
+   glBindTexture(GL_TEXTURE_2D, Tex);
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0,
+                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+   glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+   glEnable(GL_TEXTURE_2D);
+
+   /* draw something to make sure the texture is used */
+   glBegin(GL_POINTS);
+   glVertex2f(0, 0);
+   glEnd();
+
+   /* done w/ texturing */
+   glDisable(GL_TEXTURE_2D);
+
+   /* Create my Framebuffer Object */
+   glGenFramebuffersEXT(1, &MyFB);
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
+   assert(glIsFramebufferEXT(MyFB));
+
+   /* Setup color renderbuffer */
+   glGenRenderbuffersEXT(1, &ColorRb);
+   glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, ColorRb);
+   assert(glIsRenderbufferEXT(ColorRb));
+   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
+                                GL_RENDERBUFFER_EXT, ColorRb);
+   glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+
+   /* Setup depth renderbuffer (a texture) */
+   glGenRenderbuffersEXT(1, &DepthRb);
+   glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRb);
+   assert(glIsRenderbufferEXT(DepthRb));
+   /* replace RGBA texture with Z texture */
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, Width, Height, 0,
+                GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, NULL);
+   glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
+                             GL_TEXTURE_2D, Tex, 0);
+
+   CheckError(__LINE__);
+
+   /* restore to default */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+   CheckError(__LINE__);
+}
+
+
+int
+main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize(Width, Height);
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+   Win = glutCreateWindow(argv[0]);
+   glewInit();
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display );
+   if (Animate)
+      glutIdleFunc(Idle);
+   Init();
+   glutMainLoop();
+   return 0;
+}