progs/demos: update arbocclude.c to do multiple queries at once

Issue a whole bunch of queries then get the results and render.
Draw the test object in red instead of orange if the result was not
ready when we first queried it.

1 files changed, 108 insertions, 105 deletions

diff --git a/progs/demos/arbocclude.c b/progs/demos/arbocclude.c
index f669a1f26b..cc787eeb8a 100644
--- a/progs/demos/arbocclude.c
+++ b/progs/demos/arbocclude.c
@@ -32,11 +32,12 @@
 #include <GL/glew.h>
 #include <GL/glut.h>
 
-#define TEST_DISPLAY_LISTS 0
+#define NUM_OCC 10
 
 static GLboolean Anim = GL_TRUE;
-static GLfloat Xpos = 0;
-static GLuint OccQuery;
+static GLfloat Xpos[NUM_OCC], Ypos[NUM_OCC];
+static GLfloat Sign[NUM_OCC];
+static GLuint OccQuery[NUM_OCC];
 static GLint Win = 0;
 
 
@@ -54,38 +55,43 @@ PrintString(const char *s)
 static void Idle(void)
 {
    static int lastTime = 0;
-   static int sign = +1;
    int time = glutGet(GLUT_ELAPSED_TIME);
    float step;
+   int i;
 
    if (lastTime == 0)
       lastTime = time;
    else if (time - lastTime < 20)  /* 50Hz update */
       return;
 
-   step = (time - lastTime) / 1000.0 * sign;
-   lastTime = time;
+   for (i = 0; i < NUM_OCC; i++) {
 
-   Xpos += step;
+      step = (time - lastTime) / 1000.0 * Sign[i];
+
+      Xpos[i] += step;
+
+      if (Xpos[i] > 2.5) {
+         Xpos[i] = 2.5;
+         Sign[i] = -1;
+      }
+      else if (Xpos[i] < -2.5) {
+         Xpos[i] = -2.5;
+         Sign[i] = +1;
+      }
 
-   if (Xpos > 2.5) {
-      Xpos = 2.5;
-      sign = -1;
-   }
-   else if (Xpos < -2.5) {
-      Xpos = -2.5;
-      sign = +1;
    }
+
+   lastTime = time;
+
    glutPostRedisplay();
 }
 
 
 static void Display( void )
 {
-   GLuint passed;
-   GLint ready;
-   char s[100];
+   int i;
 
+   glClearColor(0.25, 0.25, 0.25, 0.0);
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 
    glMatrixMode( GL_PROJECTION );
@@ -96,97 +102,84 @@ static void Display( void )
    glTranslatef( 0.0, 0.0, -15.0 );
 
    /* draw the occluding polygons */
-   glColor3f(0, 0.6, 0.8);
+   glColor3f(0, 0.4, 0.6);
    glBegin(GL_QUADS);
-   glVertex2f(-1.6, -1.5);
-   glVertex2f(-0.4, -1.5);
-   glVertex2f(-0.4,  1.5);
-   glVertex2f(-1.6,  1.5);
-
-   glVertex2f( 0.4, -1.5);
-   glVertex2f( 1.6, -1.5);
-   glVertex2f( 1.6,  1.5);
-   glVertex2f( 0.4,  1.5);
+   glVertex2f(-1.6, -2.5);
+   glVertex2f(-0.4, -2.5);
+   glVertex2f(-0.4,  2.5);
+   glVertex2f(-1.6,  2.5);
+   glVertex2f( 0.4, -2.5);
+   glVertex2f( 1.6, -2.5);
+   glVertex2f( 1.6,  2.5);
+   glVertex2f( 0.4,  2.5);
    glEnd();
 
-   /* draw the test polygon with occlusion testing */
-   glPushMatrix();
-   glTranslatef(Xpos, 0, -0.5);
-   glScalef(0.3, 0.3, 1.0);
-   glRotatef(-90.0 * Xpos, 0, 0, 1);
-
-#if defined(GL_ARB_occlusion_query)
-#if TEST_DISPLAY_LISTS
-   glNewList(10, GL_COMPILE);
-   glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery);
-   glEndList();
-   glCallList(10);
-#else
-   glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery);
-#endif
 
    glColorMask(0, 0, 0, 0);
    glDepthMask(GL_FALSE);
 
-   glBegin(GL_POLYGON);
-   glVertex3f(-1, -1, 0);
-   glVertex3f( 1, -1, 0);
-   glVertex3f( 1,  1, 0);
-   glVertex3f(-1,  1, 0);
-   glEnd();
+   /* draw the test polygons with occlusion testing */
+   for (i = 0; i < NUM_OCC; i++) {
+      glPushMatrix();
+         glTranslatef(Xpos[i], Ypos[i], -0.5);
+         glScalef(0.2, 0.2, 1.0);
+         glRotatef(-90.0 * Xpos[i], 0, 0, 1);
+
+         glBeginQueryARB(GL_SAMPLES_PASSED_ARB, OccQuery[i]);
+         glBegin(GL_POLYGON);
+         glVertex3f(-1, -1, 0);
+         glVertex3f( 1, -1, 0);
+         glVertex3f( 1,  1, 0);
+         glVertex3f(-1,  1, 0);
+         glEnd();
+         glEndQueryARB(GL_SAMPLES_PASSED_ARB);
+
+      glPopMatrix();
+   }
 
-#if TEST_DISPLAY_LISTS
-   glNewList(11, GL_COMPILE);
-   glEndQueryARB(GL_SAMPLES_PASSED_ARB);
-   glEndList();
-   glCallList(11);
-#else
-   glEndQueryARB(GL_SAMPLES_PASSED_ARB);
-#endif
-
-   do {
-      /* do useful work here, if any */
-      glGetQueryObjectivARB(OccQuery, GL_QUERY_RESULT_AVAILABLE_ARB, &ready);
-   } while (!ready);
-   glGetQueryObjectuivARB(OccQuery, GL_QUERY_RESULT_ARB, &passed);
-
-   /* turn off occlusion testing */
    glColorMask(1, 1, 1, 1);
    glDepthMask(GL_TRUE);
-#endif /* GL_ARB_occlusion_query */
-
-   /* draw the orange rect, so we can see what's going on */
-   glColor3f(0.8, 0.5, 0);
-   glBegin(GL_POLYGON);
-   glVertex3f(-1, -1, 0);
-   glVertex3f( 1, -1, 0);
-   glVertex3f( 1,  1, 0);
-   glVertex3f(-1,  1, 0);
-   glEnd();
 
-   glPopMatrix();
-
-
-   /* Print result message */
-   glMatrixMode( GL_PROJECTION );
-   glLoadIdentity();
-   glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
-   glMatrixMode( GL_MODELVIEW );
-   glLoadIdentity();
-
-   glColor3f(1, 1, 1);
-#if defined(GL_ARB_occlusion_query)
-   sprintf(s, " %4d Fragments Visible", passed);
-   glRasterPos3f(-0.50, -0.7, 0);
-   PrintString(s);
-   if (!passed) {
-      glRasterPos3f(-0.25, -0.8, 0);
-      PrintString("Fully Occluded");
+   /* Draw the rectangles now.
+    * Draw orange if result was ready
+    * Draw red if result was not ready.
+    */
+   for (i = 0; i < NUM_OCC; i++) {
+      GLuint passed;
+      GLint ready;
+
+      glGetQueryObjectivARB(OccQuery[i], GL_QUERY_RESULT_AVAILABLE_ARB, &ready);
+
+      glGetQueryObjectuivARB(OccQuery[i], GL_QUERY_RESULT_ARB, &passed);
+
+      if (!ready)
+         glColor3f(1, 0, 0);
+      else
+         glColor3f(0.8, 0.5, 0);
+
+      if (!ready || passed) {
+         glPushMatrix();
+            glTranslatef(Xpos[i], Ypos[i], -0.5);
+            glScalef(0.2, 0.2, 1.0);
+            glRotatef(-90.0 * Xpos[i], 0, 0, 1);
+
+            glBegin(GL_POLYGON);
+            glVertex3f(-1, -1, 0);
+            glVertex3f( 1, -1, 0);
+            glVertex3f( 1,  1, 0);
+            glVertex3f(-1,  1, 0);
+            glEnd();
+
+         glPopMatrix();
+      }
+
+      {
+         char s[10];
+         glRasterPos3f(0.45, Ypos[i], 1.0);
+         sprintf(s, "%4d", passed);
+         PrintString(s);
+      }
    }
-#else
-   glRasterPos3f(-0.25, -0.8, 0);
-   PrintString("GL_ARB_occlusion_query not available at compile time");
-#endif /* GL_ARB_occlusion_query */
 
    glutSwapBuffers();
 }
@@ -222,14 +215,17 @@ static void Key( unsigned char key, int x, int y )
 static void SpecialKey( int key, int x, int y )
 {
    const GLfloat step = 0.1;
+   int i;
    (void) x;
    (void) y;
    switch (key) {
       case GLUT_KEY_LEFT:
-         Xpos -= step;
+         for (i = 0; i < NUM_OCC; i++)
+            Xpos[i] -= step;
          break;
       case GLUT_KEY_RIGHT:
-         Xpos += step;
+         for (i = 0; i < NUM_OCC; i++)
+            Xpos[i] += step;
          break;
    }
    glutPostRedisplay();
@@ -240,29 +236,33 @@ static void Init( void )
 {
    const char *ext = (const char *) glGetString(GL_EXTENSIONS);
    GLint bits;
+   int i;
 
    if (!strstr(ext, "GL_ARB_occlusion_query")) {
       printf("Sorry, this demo requires the GL_ARB_occlusion_query extension\n");
       exit(-1);
    }
 
-#if defined(GL_ARB_occlusion_query)
    glGetQueryivARB(GL_SAMPLES_PASSED_ARB, GL_QUERY_COUNTER_BITS_ARB, &bits);
    if (!bits) {
       printf("Hmmm, GL_QUERY_COUNTER_BITS_ARB is zero!\n");
       exit(-1);
    }
-#endif /* GL_ARB_occlusion_query */
 
    glGetIntegerv(GL_DEPTH_BITS, &bits);
    printf("Depthbits: %d\n", bits);
 
-#if defined(GL_ARB_occlusion_query)
-   glGenQueriesARB(1, &OccQuery);
-   assert(OccQuery > 0);
-#endif /* GL_ARB_occlusion_query */
+   glGenQueriesARB(NUM_OCC, OccQuery);
 
    glEnable(GL_DEPTH_TEST);
+
+   for (i = 0; i < NUM_OCC; i++) {
+      float t = (float) i / (NUM_OCC - 1);
+      Xpos[i] = 2.5 * t;
+      Ypos[i] = 4.0 * (t - 0.5);
+      Sign[i] = 1.0;
+   }
+
 }
 
 
@@ -276,7 +276,10 @@ int main( int argc, char *argv[] )
    glutReshapeFunc( Reshape );
    glutKeyboardFunc( Key );
    glutSpecialFunc( SpecialKey );
-   glutIdleFunc( Idle );
+   if (Anim)
+      glutIdleFunc(Idle);
+   else
+      glutIdleFunc(NULL);
    glutDisplayFunc( Display );
    Init();
    glutMainLoop();