+++ /dev/null
-/*
- * EXT_fog_coord.
- *
- * Based on glutskel.c by Brian Paul
- * and NeHe's Volumetric fog tutorial!
- *
- * Daniel Borca
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-#define DEPTH 5.0f
-
-static GLfloat camz;
-
-static GLint fogMode;
-static GLboolean fogCoord;
-static GLfloat fogDensity = 0.75;
-static GLfloat fogStart = 1.0, fogEnd = DEPTH;
-static GLfloat fogColor[4] = {0.6f, 0.3f, 0.0f, 1.0f};
-static const char *ModeStr = NULL;
-static GLboolean Arrays = GL_FALSE;
-static GLboolean Texture = GL_TRUE;
-
-
-static void
-Reset(void)
-{
- fogMode = 1;
- fogCoord = 1;
- fogDensity = 0.75;
- fogStart = 1.0;
- fogEnd = DEPTH;
- Arrays = GL_FALSE;
- Texture = GL_TRUE;
-}
-
-
-static void
-glFogCoordf_ext (GLfloat f)
-{
- if (fogCoord)
- glFogCoordfEXT(f);
-}
-
-
-static void
-PrintString(const char *s)
-{
- while (*s) {
- glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (int) *s);
- s++;
- }
-}
-
-
-static void
-PrintInfo(void)
-{
- char s[100];
-
- glDisable(GL_FOG);
- glColor3f(0, 1, 1);
-
- sprintf(s, "Mode(m): %s Start(s/S): %g End(e/E): %g Density(d/D): %g",
- ModeStr, fogStart, fogEnd, fogDensity);
- glWindowPos2iARB(5, 20);
- PrintString(s);
-
- sprintf(s, "Arrays(a): %s glFogCoord(c): %s EyeZ(z/z): %g",
- (Arrays ? "Yes" : "No"),
- (fogCoord ? "Yes" : "No"),
- camz);
- glWindowPos2iARB(5, 5);
- PrintString(s);
-}
-
-
-static int
-SetFogMode(GLint fogMode)
-{
- fogMode &= 3;
- switch (fogMode) {
- case 0:
- ModeStr = "Off";
- glDisable(GL_FOG);
- break;
- case 1:
- ModeStr = "GL_LINEAR";
- glEnable(GL_FOG);
- glFogi(GL_FOG_MODE, GL_LINEAR);
- glFogf(GL_FOG_START, fogStart);
- glFogf(GL_FOG_END, fogEnd);
- break;
- case 2:
- ModeStr = "GL_EXP";
- glEnable(GL_FOG);
- glFogi(GL_FOG_MODE, GL_EXP);
- glFogf(GL_FOG_DENSITY, fogDensity);
- break;
- case 3:
- ModeStr = "GL_EXP2";
- glEnable(GL_FOG);
- glFogi(GL_FOG_MODE, GL_EXP2);
- glFogf(GL_FOG_DENSITY, fogDensity);
- break;
- }
- return fogMode;
-}
-
-
-static GLboolean
-SetFogCoord(GLboolean fogCoord)
-{
- if (!GLEW_EXT_fog_coord) {
- return GL_FALSE;
- }
-
- if (fogCoord) {
- glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
- }
- else {
- glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FRAGMENT_DEPTH_EXT);
- }
- return fogCoord;
-}
-
-
-/* could reuse vertices */
-static GLuint vertex_index[] = {
- /* Back */
- 0, 1, 2, 3,
-
- /* Floor */
- 4, 5, 6, 7,
-
- /* Roof */
- 8, 9, 10, 11,
-
- /* Right */
- 12, 13, 14, 15,
-
- /* Left */
- 16, 17, 18, 19
-};
-
-static GLfloat vertex_pointer[][3] = {
- /* Back */
- {-1.0f,-1.0f,-DEPTH}, { 1.0f,-1.0f,-DEPTH}, { 1.0f, 1.0f,-DEPTH}, {-1.0f, 1.0f,-DEPTH},
-
- /* Floor */
- {-1.0f,-1.0f,-DEPTH}, { 1.0f,-1.0f,-DEPTH}, { 1.0f,-1.0f, 0.0}, {-1.0f,-1.0f, 0.0},
-
- /* Roof */
- {-1.0f, 1.0f,-DEPTH}, { 1.0f, 1.0f,-DEPTH}, { 1.0f, 1.0f, 0.0}, {-1.0f, 1.0f, 0.0},
-
- /* Right */
- { 1.0f,-1.0f, 0.0}, { 1.0f, 1.0f, 0.0}, { 1.0f, 1.0f,-DEPTH}, { 1.0f,-1.0f,-DEPTH},
-
- /* Left */
- {-1.0f,-1.0f, 0.0}, {-1.0f, 1.0f, 0.0}, {-1.0f, 1.0f,-DEPTH}, {-1.0f,-1.0f,-DEPTH}
-};
-
-static GLfloat texcoord_pointer[][2] = {
- /* Back */
- {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, 1.0f}, {0.0f, 1.0f},
-
- /* Floor */
- {0.0f, 0.0f}, {1.0f, 0.0f}, {1.0f, DEPTH}, {0.0f, DEPTH},
-
- /* Roof */
- {1.0f, 0.0f}, {0.0f, 0.0f}, {0.0f, DEPTH}, {1.0f, DEPTH},
-
- /* Right */
- {0.0f, 1.0f}, {0.0f, 0.0f}, {DEPTH, 0.0f}, {DEPTH, 1.0f},
-
- /* Left */
- {0.0f, 0.0f}, {0.0f, 1.0f}, {DEPTH, 1.0f}, {DEPTH, 0.0f}
-};
-
-static GLfloat fogcoord_pointer[] = {
- /* Back */
- DEPTH, DEPTH, DEPTH, DEPTH,
-
- /* Floor */
- DEPTH, DEPTH, 0.0, 0.0,
-
- /* Roof */
- DEPTH, DEPTH, 0.0, 0.0,
-
- /* Right */
- 0.0, 0.0, DEPTH, DEPTH,
-
- /* Left */
- 0.0, 0.0, DEPTH, DEPTH
-};
-
-
-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();
-}
-
-
-static void
-Reshape( int width, int height )
-{
- glViewport(0, 0, width, height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glFrustum(-1, 1, -1, 1, 1.0, 100);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-}
-
-
-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
-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();
-}
-
-
-int
-main( int argc, char *argv[] )
-{
- glutInitWindowSize( 600, 600 );
- glutInit( &argc, argv );
- glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
- glutCreateWindow(argv[0]);
- glewInit();
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Display );
- Init();
- glutMainLoop();
- return 0;
-}
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