--- /dev/null
+/*
+ * 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;
+}
projects / mesa.git / commitdiff