demos: move tests/fbotexture.c to demos/

2 files changed, 622 insertions, 0 deletions

diff --git a/progs/demos/Makefile b/progs/demos/Makefile
index 0f72595c23..a1c99c6c54 100644
--- a/progs/demos/Makefile
+++ b/progs/demos/Makefile
@@ -22,6 +22,7 @@ PROGS = \
 	drawpix \
 	engine \
 	fbo_firecube \
+	fbotexture \
 	fire \
 	fogcoord \
 	fplight \
diff --git a/progs/demos/fbotexture.c b/progs/demos/fbotexture.c
new file mode 100644
index 0000000000..50a4b00afc
--- /dev/null
+++ b/progs/demos/fbotexture.c
@@ -0,0 +1,621 @@
+/*
+ * 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
+ */
+
+
+#include <GL/glew.h>
+#include <GL/glut.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+/* For debug */
+#define DEPTH 1
+#define STENCIL 1
+#define DRAW 1
+
+
+static int Win = 0;
+static int Width = 400, Height = 400;
+
+#if 1
+static GLenum TexTarget = GL_TEXTURE_2D;
+static int TexWidth = 512, TexHeight = 512;
+static GLenum TexIntFormat = GL_RGB; /* either GL_RGB or GL_RGBA */
+#else
+static GLenum TexTarget = GL_TEXTURE_RECTANGLE_ARB;
+static int TexWidth = 200, TexHeight = 200;
+static GLenum TexIntFormat = GL_RGB5; /* either GL_RGB or GL_RGBA */
+#endif
+static GLuint TextureLevel = 0;  /* which texture level to render to */
+
+static GLuint MyFB;
+static GLuint TexObj;
+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 GLboolean Cull = GL_FALSE;
+static GLboolean Wireframe = GL_FALSE;
+
+
+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) * 0.1;
+   glutPostRedisplay();
+}
+
+
+static void
+RenderTexture(void)
+{
+   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 image */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, MyFB);
+
+   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);
+   CheckError(__LINE__);
+
+#if DEPTH
+   glEnable(GL_DEPTH_TEST);
+#endif
+
+#if STENCIL
+   glEnable(GL_STENCIL_TEST);
+   glStencilFunc(GL_NEVER, 1, ~0);
+   glStencilOp(GL_REPLACE, GL_KEEP, GL_REPLACE);
+#endif
+
+   CheckError(__LINE__);
+
+#if DEPTH || STENCIL
+   /* 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();
+#endif
+
+   /* draw teapot where stencil != 1 */
+#if STENCIL
+   glStencilFunc(GL_NOTEQUAL, 1, ~0);
+   glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+#endif
+
+   CheckError(__LINE__);
+
+   if (Wireframe) {
+      glPolygonMode(GL_FRONT, GL_LINE);
+   }
+   else {
+      glPolygonMode(GL_FRONT, GL_FILL);
+   }
+
+   if (Cull) {
+      /* cull back */
+      glCullFace(GL_BACK);
+      glEnable(GL_CULL_FACE);
+   }
+   else {
+      glDisable(GL_CULL_FACE);
+   }
+
+#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);
+   glFrontFace(GL_CW); /* Teapot patches backward */
+   glutSolidTeapot(0.5);
+   glFrontFace(GL_CCW);
+   glPopMatrix();
+   glDisable(GL_LIGHTING);
+   /*
+   PrintStencilHistogram(TexWidth, TexHeight);
+   */
+#endif
+
+   glDisable(GL_DEPTH_TEST);
+   glDisable(GL_STENCIL_TEST);
+   glDisable(GL_CULL_FACE);
+   glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+
+#if DRAW
+   /* Bind normal framebuffer */
+   glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
+#endif
+
+   CheckError(__LINE__);
+}
+
+
+
+static void
+Display(void)
+{
+   float ar = (float) Width / (float) Height;
+
+   RenderTexture();
+
+   /* draw textured quad in the window */
+#if DRAW
+   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(TexTarget);
+   glBindTexture(TexTarget, TexObj);
+   glBegin(GL_POLYGON);
+   glColor3f(0.25, 0.25, 0.25);
+   if (TexTarget == GL_TEXTURE_2D) {
+      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);
+   }
+   else {
+      assert(TexTarget == GL_TEXTURE_RECTANGLE_ARB);
+      glTexCoord2f(0, 0);
+      glVertex2f(-1, -1);
+      glTexCoord2f(TexWidth, 0);
+      glVertex2f(1, -1);
+      glColor3f(1.0, 1.0, 1.0);
+      glTexCoord2f(TexWidth, TexHeight);
+      glVertex2f(1, 1);
+      glTexCoord2f(0, TexHeight);
+      glVertex2f(-1, 1);
+   }
+   glEnd();
+   glPopMatrix();
+   glDisable(TexTarget);
+#endif
+
+   glutSwapBuffers();
+   CheckError(__LINE__);
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport(0, 0, width, height);
+   Width = width;
+   Height = height;
+}
+
+
+static void
+CleanUp(void)
+{
+#if DEPTH
+   glDeleteRenderbuffersEXT(1, &DepthRB);
+#endif
+#if STENCIL
+   glDeleteRenderbuffersEXT(1, &StencilRB);
+#endif
+   glDeleteFramebuffersEXT(1, &MyFB);
+
+   glDeleteTextures(1, &TexObj);
+
+   glutDestroyWindow(Win);
+
+   exit(0);
+}
+
+
+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 'c':
+      Cull = !Cull;
+      break;
+   case 'w':
+      Wireframe = !Wireframe;
+      break;
+   case 's':
+      Rot += 2.0;
+      break;
+   case 'S':
+      Rot -= 2.0;
+      break;
+   case 27:
+      CleanUp();
+      break;
+   }
+   glutPostRedisplay();
+}
+
+
+/**
+ * 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)
+{
+   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) {
+         glDeleteRenderbuffersEXT(1, depthRbOut);
+         *depthRbOut = 0;
+         glDeleteRenderbuffersEXT(1, &rb);
+         return GL_FALSE;
+      }
+
+      *stencilRbOut = rb;
+   }
+
+   return GL_TRUE;
+}
+
+
+static void
+ParseArgs(int argc, char *argv[])
+{
+   GLint i;
+   for (i = 1; i < argc; i++) {
+      if (strcmp(argv[i], "-ds") == 0) {
+         if (!glutExtensionSupported("GL_EXT_packed_depth_stencil")) {
+            printf("GL_EXT_packed_depth_stencil not found!\n");
+            exit(0);
+         }
+         UsePackedDepthStencil = GL_TRUE;
+         printf("Using GL_EXT_packed_depth_stencil\n");
+      }
+      else if (strcmp(argv[i], "-ds2") == 0) {
+         if (!glutExtensionSupported("GL_EXT_packed_depth_stencil")) {
+            printf("GL_EXT_packed_depth_stencil not found!\n");
+            exit(0);
+         }
+         if (!glutExtensionSupported("GL_ARB_framebuffer_object")) {
+            printf("GL_ARB_framebuffer_object not found!\n");
+            exit(0);
+         }
+         UsePackedDepthStencilBoth = GL_TRUE;
+         printf("Using GL_EXT_packed_depth_stencil and GL_DEPTH_STENCIL attachment point\n");
+      }
+      else if (strcmp(argv[i], "-arb") == 0) {
+         if (!glutExtensionSupported("GL_ARB_framebuffer_object")) {
+            printf("Sorry, GL_ARB_framebuffer object not supported!\n");
+         }
+         else {
+            Use_ARB_fbo = GL_TRUE;
+         }
+      }
+      else {
+         printf("Unknown option: %s\n", argv[i]);
+      }
+   }
+}
+
+
+/*
+ * 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 = 90;
+   }
+
+   /* 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);
+      }
+   }
+
+   /* 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);
+
+      glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, StencilRB);
+      glGetRenderbufferParameterivEXT(GL_RENDERBUFFER_EXT,
+                                      GL_RENDERBUFFER_STENCIL_SIZE_EXT, &bits);
+      printf("Stencil renderbuffer size = %d bits\n", bits);
+   }
+
+   /* 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 */
+   {
+      static const GLfloat mat[4] = { 1.0, 0.5, 0.5, 1.0 };
+      glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat);
+   }
+
+   /*
+    * Make texture object/image (we'll render into this texture)
+    */
+   {
+      glGenTextures(1, &TexObj);
+      glBindTexture(TexTarget, TexObj);
+
+      /* make two image levels */
+      glTexImage2D(TexTarget, 0, TexIntFormat, TexWidth, TexHeight, 0,
+                   GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+      if (TexTarget == GL_TEXTURE_2D) {
+         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_MAX_LEVEL, TextureLevel);
+      }
+
+      glTexParameteri(TexTarget, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+      glTexParameteri(TexTarget, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+      glTexParameteri(TexTarget, GL_TEXTURE_BASE_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 Try 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");
+}
+
+
+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 (Anim)
+      glutIdleFunc(Idle);
+
+   ParseArgs(argc, argv);
+   Init();
+   Usage();
+
+   glutMainLoop();
+   return 0;
+}