static void
Init(void)
{
static const GLubyte teximage[2][2][4] = {
{ { 255, 255, 255, 255}, { 128, 128, 128, 255} },
{ { 128, 128, 128, 255}, { 255, 255, 255, 255} }
};
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
if (!GLEW_EXT_fog_coord) {
printf("GL_EXT_fog_coord not supported!\n");
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0,
GL_RGBA, GL_UNSIGNED_BYTE, teximage);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glClearColor(0.1f, 0.1f, 0.1f, 0.0f);
glDepthFunc(GL_LEQUAL);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
glFogfv(GL_FOG_COLOR, fogColor);
glHint(GL_FOG_HINT, GL_NICEST);
fogCoord = SetFogCoord(GL_TRUE); /* try to enable fog_coord */
fogMode = SetFogMode(1);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, vertex_pointer);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, texcoord_pointer);
if (GLEW_EXT_fog_coord) {
glEnableClientState(GL_FOG_COORDINATE_ARRAY_EXT);
glFogCoordPointerEXT(GL_FLOAT, 0, fogcoord_pointer);
}
Reset();
}
void CBaseShader::FogToFogColor( void )
{
Assert( IsSnapshotting() );
SetFogMode( SHADER_FOGMODE_FOGCOLOR );
}
void CBaseShader::FogToGrey( void )
{
Assert( IsSnapshotting() );
SetFogMode( SHADER_FOGMODE_GREY );
}
void CBaseShader::FogToBlack( void )
{
Assert( IsSnapshotting() );
SetFogMode( SHADER_FOGMODE_BLACK );
}
void CBaseShader::FogToWhite( void )
{
Assert( IsSnapshotting() );
SetFogMode( SHADER_FOGMODE_WHITE );
}
//-----------------------------------------------------------------------------
//
// Helper methods for fog
//
//-----------------------------------------------------------------------------
void CBaseShader::FogToOOOverbright( void )
{
Assert( IsSnapshotting() );
SetFogMode( SHADER_FOGMODE_OO_OVERBRIGHT );
}
static void
Key( unsigned char key, int x, int y )
{
(void) x;
(void) y;
switch (key) {
case 'a':
Arrays = !Arrays;
break;
case 'f':
case 'm':
fogMode = SetFogMode(fogMode + 1);
break;
case 'D':
fogDensity += 0.05;
SetFogMode(fogMode);
break;
case 'd':
if (fogDensity > 0.0) {
fogDensity -= 0.05;
}
SetFogMode(fogMode);
break;
case 's':
if (fogStart > 0.0) {
fogStart -= 0.25;
}
SetFogMode(fogMode);
break;
case 'S':
if (fogStart < 100.0) {
fogStart += 0.25;
}
SetFogMode(fogMode);
break;
case 'e':
if (fogEnd > 0.0) {
fogEnd -= 0.25;
}
SetFogMode(fogMode);
break;
case 'E':
if (fogEnd < 100.0) {
fogEnd += 0.25;
}
SetFogMode(fogMode);
break;
case 'c':
fogCoord = SetFogCoord(fogCoord ^ GL_TRUE);
break;
case 't':
Texture = !Texture;
break;
case 'z':
camz -= 0.1;
break;
case 'Z':
camz += 0.1;
break;
case 'r':
Reset();
break;
case 27:
exit(0);
break;
}
glutPostRedisplay();
}
static void
Display( void )
{
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity ();
glTranslatef(0.0f, 0.0f, -camz);
SetFogMode(fogMode);
glColor3f(1, 1, 1);
if (Texture)
glEnable(GL_TEXTURE_2D);
if (Arrays) {
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glDrawElements(GL_QUADS, sizeof(vertex_index) / sizeof(vertex_index[0]),
GL_UNSIGNED_INT, vertex_index);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
}
else {
/* Back */
glBegin(GL_QUADS);
glFogCoordf_ext(DEPTH); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f,-DEPTH);
glFogCoordf_ext(DEPTH); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,-1.0f,-DEPTH);
glFogCoordf_ext(DEPTH); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f,-DEPTH);
glFogCoordf_ext(DEPTH); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f,-DEPTH);
glEnd();
/* Floor */
glBegin(GL_QUADS);
glFogCoordf_ext(DEPTH); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f,-DEPTH);
glFogCoordf_ext(DEPTH); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,-1.0f,-DEPTH);
glFogCoordf_ext(0.0f); glTexCoord2f(1.0f, DEPTH); glVertex3f( 1.0f,-1.0f,0.0);
glFogCoordf_ext(0.0f); glTexCoord2f(0.0f, DEPTH); glVertex3f(-1.0f,-1.0f,0.0);
glEnd();
/* Roof */
glBegin(GL_QUADS);
glFogCoordf_ext(DEPTH); glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, 1.0f,-DEPTH);
glFogCoordf_ext(DEPTH); glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, 1.0f,-DEPTH);
glFogCoordf_ext(0.0f); glTexCoord2f(0.0f, DEPTH); glVertex3f( 1.0f, 1.0f,0.0);
glFogCoordf_ext(0.0f); glTexCoord2f(1.0f, DEPTH); glVertex3f(-1.0f, 1.0f,0.0);
glEnd();
/* Right */
glBegin(GL_QUADS);
glFogCoordf_ext(0.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f,-1.0f,0.0);
glFogCoordf_ext(0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, 1.0f,0.0);
glFogCoordf_ext(DEPTH); glTexCoord2f(DEPTH, 0.0f); glVertex3f( 1.0f, 1.0f,-DEPTH);
glFogCoordf_ext(DEPTH); glTexCoord2f(DEPTH, 1.0f); glVertex3f( 1.0f,-1.0f,-DEPTH);
glEnd();
/* Left */
glBegin(GL_QUADS);
glFogCoordf_ext(0.0f); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f,0.0);
glFogCoordf_ext(0.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f,0.0);
glFogCoordf_ext(DEPTH); glTexCoord2f(DEPTH, 1.0f); glVertex3f(-1.0f, 1.0f,-DEPTH);
glFogCoordf_ext(DEPTH); glTexCoord2f(DEPTH, 0.0f); glVertex3f(-1.0f,-1.0f,-DEPTH);
glEnd();
}
glDisable(GL_TEXTURE_2D);
PrintInfo();
glutSwapBuffers();
}