Major check-in of changes for GL_EXT_framebuffer_object extension.
Main driver impacts:
- new code for creating the Mesa GLframebuffer
- new span/pixel read/write code
Some drivers not yet updated/tested.
diff --git a/progs/tests/fbotest1.c b/progs/tests/fbotest1.c
new file mode 100644
index 0000000..1b71004
--- /dev/null
+++ b/progs/tests/fbotest1.c
@@ -0,0 +1,169 @@
+/*
+ * Test GL_EXT_framebuffer_object
+ *
+ * Brian Paul
+ * 7 Feb 2005
+ */
+
+
+#define GL_GLEXT_PROTOTYPES
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+static int Width = 400, Height = 400;
+static GLuint MyFB;
+
+
+static void
+CheckError(int line)
+{
+ GLenum err = glGetError();
+ if (err) {
+ printf("GL Error 0x%x at line %d\n", (int) err, line);
+ }
+}
+
+
+static void
+Display( void )
+{
+ GLubyte *buffer = malloc(Width * Height * 4);
+ GLenum status;
+
+ /* 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("Framebuffer incomplete!!!\n");
+ }
+
+ glClearColor(0.5, 0.5, 1.0, 0.0);
+ glClear( GL_COLOR_BUFFER_BIT );
+
+ glBegin(GL_POLYGON);
+ glColor3f(1, 0, 0);
+ glVertex2f(-1, -1);
+ glColor3f(0, 1, 0);
+ glVertex2f(1, -1);
+ glColor3f(0, 0, 1);
+ glVertex2f(0, 1);
+ glEnd();
+
+ /* read from user framebuffer */
+ glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+
+ /* draw to window */
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+ glWindowPos2iARB(0, 0);
+ glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+
+ free(buffer);
+ glutSwapBuffers();
+}
+
+
+static void
+Reshape( int width, int height )
+{
+ float ar = (float) width / (float) height;
+ glViewport( 0, 0, width, height );
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+#if 0
+ glFrustum( -ar, ar, -1.0, 1.0, 5.0, 25.0 );
+#else
+ glOrtho(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
+#endif
+ glMatrixMode( GL_MODELVIEW );
+ glLoadIdentity();
+ glTranslatef( 0.0, 0.0, -15.0 );
+ Width = width;
+ Height = height;
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+}
+
+
+static void
+Key( unsigned char key, int x, int y )
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+Init( void )
+{
+ GLuint rb;
+ GLint i;
+
+ 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));
+
+ glGenFramebuffersEXT(1, &MyFB);
+ assert(MyFB);
+ assert(glIsFramebufferEXT(MyFB));
+ glDeleteFramebuffersEXT(1, &MyFB);
+ assert(!glIsFramebufferEXT(MyFB));
+ /* Note, continue to use MyFB below */
+
+ glGenRenderbuffersEXT(1, &rb);
+ assert(rb);
+ assert(glIsRenderbufferEXT(rb));
+ glDeleteRenderbuffersEXT(1, &rb);
+ assert(!glIsRenderbufferEXT(rb));
+ rb = 42; /* an arbitrary ID */
+
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
+ assert(glIsFramebufferEXT(MyFB));
+ glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, rb);
+ assert(glIsRenderbufferEXT(rb));
+
+ glGetIntegerv(GL_RENDERBUFFER_BINDING_EXT, &i);
+ assert(i == rb);
+
+ glGetIntegerv(GL_FRAMEBUFFER_BINDING_EXT, &i);
+ assert(i == MyFB);
+
+ glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT1_EXT,
+ GL_RENDERBUFFER_EXT, rb);
+
+ glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGB, Width, Height);
+
+ CheckError(__LINE__);
+
+ /* restore to default */
+ glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+}
+
+
+int
+main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize(Width, Height);
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
+ glutCreateWindow(argv[0]);
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutDisplayFunc( Display );
+ Init();
+ glutMainLoop();
+ return 0;
+}