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.

5 files changed, 449 insertions, 1 deletions

diff --git a/progs/demos/reflect.c b/progs/demos/reflect.c
index d259d7b..bf6d91a 100644
--- a/progs/demos/reflect.c
+++ b/progs/demos/reflect.c
@@ -389,7 +389,7 @@ static void SpecialKey( int key, int x, int y )
 int main( int argc, char *argv[] )
 {
    glutInit(&argc, argv);
-   glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_STENCIL);
+   glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH | GLUT_STENCIL | GLUT_ALPHA);
    glutInitWindowPosition( 0, 0 );
    glutInitWindowSize( Width, Height );
    glutCreateWindow(argv[0]);
diff --git a/progs/tests/Makefile b/progs/tests/Makefile
index c1218b1..4d3d269 100644
--- a/progs/tests/Makefile
+++ b/progs/tests/Makefile
@@ -26,6 +26,8 @@ SOURCES = antialias.c \
 	cva.c \
 	dinoshade.c \
 	floattex.c \
+	fbotest1.c \
+	fbotexture.c \
 	fogcoord.c \
 	fptest1.c \
 	fptexture.c \
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;
+}
diff --git a/progs/tests/fbotexture.c b/progs/tests/fbotexture.c
new file mode 100644
index 0000000..dc34742
--- /dev/null
+++ b/progs/tests/fbotexture.c
@@ -0,0 +1,276 @@
+/*
+ * Test GL_EXT_framebuffer_object render-to-texture
+ *
+ * Draw a teapot into a texture image with stenciling.
+ * Then draw a textured quad using that texture.
+ *
+ * Brian Paul
+ * 18 Apr 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 int TexWidth = 512, TexHeight = 512;
+static GLuint MyFB;
+static GLuint TexObj;
+static GLuint DepthRB, StencilRB;
+static GLboolean Anim = GL_FALSE;
+static GLfloat Rot = 0.0;
+
+
+static void
+CheckError(int line)
+{
+   GLenum err = glGetError();
+   if (err) {
+      printf("GL Error 0x%x at line %d\n", (int) err, line);
+   }
+}
+
+
+static void
+Idle(void)
+{
+   Rot = glutGet(GLUT_ELAPSED_TIME) * 0.05;
+   glutPostRedisplay();
+}
+
+
+static void
+RenderTexture(void)
+{
+   GLint level = 0;
+   GLenum status;
+
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glOrtho(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef(0.0, 0.0, -15.0);
+
+   /* draw to texture */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
+   glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
+                             GL_TEXTURE_2D, TexObj, level);
+
+   status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
+   if (status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+      printf("Framebuffer incomplete!!!\n");
+   }
+
+   glViewport(0, 0, TexWidth, TexHeight);
+
+   glClearColor(0.5, 0.5, 1.0, 0.0);
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+
+   glEnable(GL_DEPTH_TEST);
+   glEnable(GL_STENCIL_TEST);
+   glStencilFunc(GL_NEVER, 1, ~0);
+   glStencilOp(GL_REPLACE, GL_KEEP, GL_REPLACE);
+
+   /* draw diamond-shaped stencil pattern */
+   glColor3f(0, 1, 0);
+   glBegin(GL_POLYGON);
+   glVertex2f(-0.2,  0.0);
+   glVertex2f( 0.0, -0.2);
+   glVertex2f( 0.2,  0.0);
+   glVertex2f( 0.0,  0.2);
+   glEnd();
+
+   /* draw teapot where stencil != 1 */
+   glStencilFunc(GL_NOTEQUAL, 1, ~0);
+   glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+
+#if 0
+   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();
+#else
+   glEnable(GL_LIGHTING);
+   glEnable(GL_LIGHT0);
+   glPushMatrix();
+   glRotatef(0.5 * Rot, 1.0, 0.0, 0.0);
+   glutSolidTeapot(0.5);
+   glPopMatrix();
+   glDisable(GL_LIGHTING);
+#endif
+   glDisable(GL_DEPTH_TEST);
+   glDisable(GL_STENCIL_TEST);
+
+   /* Bind normal framebuffer */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+
+   CheckError(__LINE__);
+}
+
+
+
+static void
+Display(void)
+{
+   float ar = (float) Width / (float) Height;
+
+   RenderTexture();
+
+   /* draw textured quad in the window */
+
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum(-ar, ar, -1.0, 1.0, 5.0, 25.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef(0.0, 0.0, -7.0);
+
+   glViewport(0, 0, Width, Height);
+
+   glClearColor(0.25, 0.25, 0.25, 0);
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   glPushMatrix();
+   glRotatef(Rot, 0, 1, 0);
+   glEnable(GL_TEXTURE_2D);
+   glBegin(GL_POLYGON);
+   glColor3f(0.25, 0.25, 0.25);
+   glTexCoord2f(0, 0);
+   glVertex2f(-1, -1);
+   glTexCoord2f(1, 0);
+   glVertex2f(1, -1);
+   glColor3f(1.0, 1.0, 1.0);
+   glTexCoord2f(1, 1);
+   glVertex2f(1, 1);
+   glTexCoord2f(0, 1);
+   glVertex2f(-1, 1);
+   glEnd();
+   glPopMatrix();
+   glDisable(GL_TEXTURE_2D);
+   
+   glutSwapBuffers();
+   CheckError(__LINE__);
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport(0, 0, width, height);
+   Width = width;
+   Height = height;
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 'a':
+         Anim = !Anim;
+         if (Anim)
+            glutIdleFunc(Idle);
+         else
+            glutIdleFunc(NULL);
+         break;
+      case 27:
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+Init(void)
+{
+   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));
+
+   /* make framebuffer */
+   glGenFramebuffersEXT(1, &MyFB);
+   assert(MyFB);
+   assert(glIsFramebufferEXT(MyFB));
+   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 depth renderbuffer */
+   glGenRenderbuffersEXT(1, &DepthRB);
+   assert(DepthRB);
+   assert(glIsRenderbufferEXT(DepthRB));
+   glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, DepthRB);
+   glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT,
+                            TexWidth, TexHeight);
+
+   /* make stencil renderbuffer */
+   glGenRenderbuffersEXT(1, &StencilRB);
+   assert(StencilRB);
+   assert(glIsRenderbufferEXT(StencilRB));
+   glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, StencilRB);
+   glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_STENCIL_INDEX,
+                            TexWidth, TexHeight);
+
+   /* attach DepthRB to MyFB */
+   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT,
+                                GL_RENDERBUFFER_EXT, DepthRB);
+
+   /* attach StencilRB to MyFB */
+   glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT,
+                                GL_RENDERBUFFER_EXT, StencilRB);
+
+
+   /* bind regular framebuffer */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+
+   /* Make texture object/image */
+   glGenTextures(1, &TexObj);
+   glBindTexture(GL_TEXTURE_2D, TexObj);
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, TexWidth, TexHeight, 0,
+                GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+   glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
+   CheckError(__LINE__);
+}
+
+
+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);
+   if (Anim)
+      glutIdleFunc(Idle);
+   Init();
+   glutMainLoop();
+   return 0;
+}
diff --git a/progs/tests/getprocaddress.c b/progs/tests/getprocaddress.c
index 7022552..2480ed4 100644
--- a/progs/tests/getprocaddress.c
+++ b/progs/tests/getprocaddress.c
@@ -288,6 +288,7 @@ check_functions( const char *extensions )
 
    for (entry = functions; entry->name; entry++) {
       if (entry->name[0] == '-') {
+         /* XXX update for OpenGL 2.0 */
          if (entry->name[1] == '1') {
             /* check GL version X.Y */
             const char *version = (const char *) glGetString(GL_VERSION);