KonstantinSeurer
/
mesa
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

trivial/tri-z: add controls for depthrange min/max 

Also add key to set up quake-1 style ztrick rendering with clear depth
1.0, deptrange(1.0, 0.0) and depthfunc GL_GREATER.
This commit is contained in:
Keith Whitwell 2009-05-13 13:47:38 +01:00 committed by José Fonseca
parent 3c756ed39f
commit 00e7a60077
1 changed files with 40 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
progs/trivial/tri-z.c
View File

@ -57,13 +57,19 @@ static struct { GLenum func; const char *str; } funcs[] =
static int curFunc = 0;
static double clearVal = 1.0;
static float minZ = 0.0;
static float maxZ = 1.0;
static void usage(void)
{
printf("t - toggle rendering order of triangles\n");
printf("c - toggle Z clear value between 0, 1\n");
printf("f - cycle through depth test functions\n");
printf("t - toggle rendering order of triangles\n");
printf("c - toggle Z clear value between 0, 1\n");
printf("f - cycle through depth test functions\n");
printf("n/N - decrease/increase depthrange minZ\n");
printf("x/X - decrease/increase depthrange maxZ\n");
printf("spc - reset\n");
printf("z - set to reverse-direction (ztrick) mode\n");
fflush(stdout);
}
@ -97,9 +103,11 @@ static void drawRightTriangle(void)
void display(void)
{
printf("GL_CLEAR_DEPTH = %f GL_DEPTH_FUNC = %s\n",
clearVal, funcs[curFunc].str);
printf("GL_CLEAR_DEPTH = %.2f, GL_DEPTH_FUNC = %s, DepthRange(%.1f, %.1f)\n",
clearVal, funcs[curFunc].str, minZ, maxZ);
fflush(stdout);
glClearDepth(clearVal);
glDepthRange(minZ, maxZ);
glDepthFunc(funcs[curFunc].func);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@ -131,27 +139,49 @@ void reshape(int w, int h)
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'n':
minZ -= .1;
break;
case 'N':
minZ += .1;
break;
case 'x':
maxZ -= .1;
break;
case 'X':
maxZ += .1;
break;
case 'c':
case 'C':
clearVal = 1.0 - clearVal;
glutPostRedisplay();
break;
case 'f':
case 'F':
curFunc = (curFunc + 1) % NUM_FUNCS;
glutPostRedisplay();
break;
case 't':
case 'T':
leftFirst = !leftFirst;
glutPostRedisplay();
break;
case ' ':
curFunc = 0;
clearVal = 1.0;
minZ = 0.0;
maxZ = 1.0;
break;
case 'z':
curFunc = 2;
clearVal = 0.0;
minZ = 1.0;
maxZ = 0.0;
break;
case 27: /* Escape key */
exit(0);
break;
default:
break;
return;
}
glutPostRedisplay();
}
/* Main Loop