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authorKeith Whitwell <keithw@vmware.com>2009-05-13 13:47:38 +0100
committerJosé Fonseca <jfonseca@vmware.com>2009-06-01 18:39:58 -0700
commit00e7a600776ceb589bd5939ccd8aad937527db81 (patch)
treed215cc1fb3c2a021f94042e3aeea40cf0d04cc76 /progs/trivial
parent3c756ed39f93bd26bc81f6e3be0440429ad58c40 (diff)
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.
Diffstat (limited to 'progs/trivial')
-rw-r--r--progs/trivial/tri-z.c50
1 files changed, 40 insertions, 10 deletions
diff --git a/progs/trivial/tri-z.c b/progs/trivial/tri-z.c
index 335d2b90e2..014aaa071a 100644
--- a/progs/trivial/tri-z.c
+++ b/progs/trivial/tri-z.c
@@ -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