Add a fog mode (normal and fog_coord, leaner/exp/exp2 mode) testing program I

wrote for sis, which has also exposed a few bugs elsewhere.

diff --git a/progs/tests/Makefile b/progs/tests/Makefile
index fc8476a27a747defa691d7795c2f52501093a84f..03bb6c2ad508d4e310e30b3b167e7bfc6cfdee18 100644 (file)
--- a/progs/tests/Makefile
+++ b/progs/tests/Makefile
@@ -30,6 +30,7 @@ SOURCES = antialias.c \
        floattex.c \
        fbotest1.c \
        fbotexture.c \
+       fog.c \
        fogcoord.c \
        fptest1.c \
        fptexture.c \

diff --git a/progs/tests/fog.c b/progs/tests/fog.c
new file mode 100644 (file)
index 0000000..ecd9f53
--- /dev/null
+++ b/progs/tests/fog.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright 2005 Eric Anholt
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Authors:
+ *    Eric Anholt <anholt@FreeBSD.org>
+ *    Brian Paul (fogcoord.c used as a skeleton)
+ */
+
+/*
+ * Test to exercise fog modes and for comparison with GL_EXT_fog_coord.
+ */
+
+#define GL_GLEXT_PROTOTYPES
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+static int Width = 600;
+static int Height = 600;
+static GLfloat Near = 0.0, Far = 1.0;
+GLboolean has_fogcoord;
+
+static void drawString( const char *string )
+{
+   glRasterPos2f(0, .5);
+   while ( *string ) {
+      glutBitmapCharacter( GLUT_BITMAP_TIMES_ROMAN_10, *string );
+      string++;
+   }
+}
+
+static void Display( void )
+{
+   GLint i, depthi;
+   GLfloat fogcolor[4] = {1, 1, 1, 1};
+
+   glEnable(GL_FOG);
+   glFogfv(GL_FOG_COLOR, fogcolor);
+
+   glClearColor(0.2, 0.2, 0.8, 0);
+   glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+   glPushMatrix();
+   for (i = 0; i < 6; i++) {
+      if (i >= 3 && !has_fogcoord)
+        break;
+
+      glPushMatrix();
+      for (depthi = 0; depthi < 5; depthi++) {
+        GLfloat depth = Near + (Far - Near) * depthi / 4;
+
+        switch (i % 3) {
+        case 0:
+           glFogi(GL_FOG_MODE, GL_LINEAR);
+           glFogf(GL_FOG_START, Near);
+           glFogf(GL_FOG_END, Far);
+           break;
+        case 1:
+           glFogi(GL_FOG_MODE, GL_EXP);
+           glFogf(GL_FOG_DENSITY, 2);
+           break;
+        case 2:
+           glFogi(GL_FOG_MODE, GL_EXP2);
+           glFogf(GL_FOG_DENSITY, 2);
+           break;
+        }
+
+        glColor4f(0, 0, 0, 0);
+        if (i < 3) {
+           if (has_fogcoord)
+              glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FRAGMENT_DEPTH_EXT);
+
+            glBegin(GL_POLYGON);
+            glVertex3f(0, 0, depth);
+            glVertex3f(1, 0, depth);
+            glVertex3f(1, 1, depth);
+            glVertex3f(0, 1, depth);
+            glEnd();
+        } else {
+           glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
+           glFogCoordfEXT(depth);
+
+            glBegin(GL_POLYGON);
+            glVertex3f(0, 0, (Near + Far) / 2);
+            glVertex3f(1, 0, (Near + Far) / 2);
+            glVertex3f(1, 1, (Near + Far) / 2);
+            glVertex3f(0, 1, (Near + Far) / 2);
+            glEnd();
+        }
+        glTranslatef(1.5, 0, 0);
+      }
+
+      glTranslatef(.1, 0, 0);
+      switch (i) {
+      case 0:
+        drawString("GL_LINEAR");
+         break;
+      case 1:
+        drawString("GL_EXP");
+         break;
+      case 2:
+        drawString("GL_EXP2");
+         break;
+      case 3:
+        drawString("GL_FOGCOORD GL_LINEAR");
+         break;
+      case 4:
+        drawString("GL_FOGCOORD GL_EXP");
+         break;
+      case 5:
+        drawString("GL_FOGCOORD GL_EXP2");
+         break;
+      }
+
+      glPopMatrix();
+      glTranslatef(0, 1.5, 0);
+   }
+   glPopMatrix();
+
+   glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+   Width = width;
+   Height = height;
+   glViewport( 0, 0, width, height );
+
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glOrtho( 0, 11, 9, 0, -Near, -Far );
+
+   glMatrixMode( GL_MODELVIEW );
+   glLoadIdentity();
+   glTranslatef(.25, .25, 0);
+}
+
+
+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 )
+{
+   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+   printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
+   /* setup lighting, etc */
+   has_fogcoord = glutExtensionSupported("GL_EXT_fog_coord");
+   if (!has_fogcoord) {
+      printf("Some output of this program requires GL_EXT_fog_coord\n");
+   }
+}
+
+
+int main( int argc, char *argv[] )
+{
+   glutInit( &argc, argv );
+   glutInitWindowPosition( 0, 0 );
+   glutInitWindowSize( Width, Height );
+   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
+   glutCreateWindow(argv[0]);
+   glutReshapeFunc( Reshape );
+   glutKeyboardFunc( Key );
+   glutDisplayFunc( Display );
+   Init();
+   glutMainLoop();
+   return 0;
+}