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authorEric Anholt <anholt@FreeBSD.org>2005-10-26 09:48:03 +0000
committerEric Anholt <anholt@FreeBSD.org>2005-10-26 09:48:03 +0000
commit896735e41296aef29278a9319ce53aa4485cf324 (patch)
tree471181ec5a95ff0aefd27e42c975999545511afb /progs
parent2330ed08c3d5f5fe3c02634d54e606501dff4862 (diff)
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.
Diffstat (limited to 'progs')
-rw-r--r--progs/tests/Makefile1
-rw-r--r--progs/tests/fog.c199
2 files changed, 200 insertions, 0 deletions
diff --git a/progs/tests/Makefile b/progs/tests/Makefile
index fc8476a27a..03bb6c2ad5 100644
--- 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
index 0000000000..ecd9f533f9
--- /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;
+}