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-rw-r--r--progs/tests/fog.c200
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diff --git a/progs/tests/fog.c b/progs/tests/fog.c
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--- a/progs/tests/fog.c
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-/*
- * 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.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glew.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]);
- glewInit();
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Display );
- Init();
- glutMainLoop();
- return 0;
-}