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Code Issues Projects Releases Packages Wiki Activity Actions 2

Improve this demo in a few ways.

Browse source 
1. Use more reasonable hither/yon clip planes to make better use of shallow
(16-bit) z buffers.
2. Use different colors on cube faces to help detect Z fighting if it occurs.
3. Report GL_DEPTH_BITS on start-up.
This commit is contained in:
Brian 2007-07-11 13:11:47 -06:00
parent ee7fece054
commit 34f6243bef
1 changed files with 22 additions and 12 deletions
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34
progs/xdemos/offset.c
View file

@ -71,12 +71,12 @@ typedef Vertex Quad[4];
/* data to define the six faces of a unit cube */
Quad quads[MAXQUAD] = {
{ {0,0,0}, {1,0,0}, {1,1,0}, {0,1,0} },
{ {0,0,1}, {1,0,1}, {1,1,1}, {0,1,1} },
{ {0,0,0}, {1,0,0}, {1,0,1}, {0,0,1} },
{ {0,1,0}, {1,1,0}, {1,1,1}, {0,1,1} },
{ {0,0,0}, {0,0,1}, {0,1,1}, {0,1,0} },
{ {1,0,0}, {1,0,1}, {1,1,1}, {1,1,0} }
{ {0,0,0}, {0,0,1}, {0,1,1}, {0,1,0} }, /* x = 0 */
{ {0,0,0}, {1,0,0}, {1,0,1}, {0,0,1} }, /* y = 0 */
{ {0,0,0}, {1,0,0}, {1,1,0}, {0,1,0} }, /* z = 0 */
{ {1,0,0}, {1,0,1}, {1,1,1}, {1,1,0} }, /* x = 1 */
{ {0,1,0}, {1,1,0}, {1,1,1}, {0,1,1} }, /* y = 1 */
{ {0,0,1}, {1,0,1}, {1,1,1}, {0,1,1} } /* z = 1 */
};
#define WIREFRAME 0
@ -86,7 +86,7 @@ static void error(const char* prog, const char* msg);
static void cubes(int mx, int my, int mode);
static void fill(Quad quad);
static void outline(Quad quad);
static void draw_hidden(Quad quad, int mode);
static void draw_hidden(Quad quad, int mode, int face);
static void process_input(Display *dpy, Window win);
static int query_extension(char* extName);
@ -101,6 +101,7 @@ int main(int argc, char** argv) {
XSetWindowAttributes swa;
Window win;
GLXContext cx;
GLint z;
dpy = XOpenDisplay(0);
if (!dpy) error(argv[0], "can't open display");
@ -134,13 +135,16 @@ int main(int argc, char** argv) {
/* set up viewing parameters */
glMatrixMode(GL_PROJECTION);
gluPerspective(20, 1, 0.1, 20);
gluPerspective(20, 1, 10, 20);
glMatrixMode(GL_MODELVIEW);
glTranslatef(0, 0, -15);
/* set other relevant state information */
glEnable(GL_DEPTH_TEST);
glGetIntegerv(GL_DEPTH_BITS, &z);
printf("GL_DEPTH_BITS = %d\n", z);
#ifdef GL_EXT_polygon_offset
printf("using 1.0 offset extension\n");
glPolygonOffsetEXT( 1.0, 0.00001 );
@ -160,6 +164,7 @@ int main(int argc, char** argv) {
static void
draw_scene(int mx, int my) {
glClearColor(0.25, 0.25, 0.25, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
@ -206,7 +211,7 @@ cubes(int mx, int my, int mode) {
glTranslatef(x, y, z);
glScalef(0.8, 0.8, 0.8);
for (i = 0; i < MAXQUAD; i++)
draw_hidden(quads[i], mode);
draw_hidden(quads[i], mode, i);
glPopMatrix();
}
}
@ -236,13 +241,18 @@ outline(Quad quad) {
}
static void
draw_hidden(Quad quad, int mode) {
draw_hidden(Quad quad, int mode, int face) {
static const GLfloat colors[3][3] = {
{0.5, 0.5, 0.0},
{0.8, 0.5, 0.0},
{0.0, 0.5, 0.8}
};
if (mode == HIDDEN_LINE) {
glColor3f(0, 0, 0);
glColor3fv(colors[face % 3]);
fill(quad);
}
/* draw the outline using white, optionally fill the interior with black */
/* draw the outline using white */
glColor3f(1, 1, 1);
outline(quad);
}