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progs/tests: exercise display lists and pixelstore

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This commit is contained in:
Brian Paul 2009-09-11 11:14:12 -06:00
parent d7512521fd
commit 284d3b2d9c
1 changed files with 55 additions and 14 deletions
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69
progs/tests/zreaddraw.c
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@ -13,14 +13,16 @@
static GLint WinWidth = 500, WinHeight = 500;
static GLboolean Invert = GL_FALSE;
static GLboolean TestPacking = GL_FALSE;
static GLboolean TestList = GL_FALSE;
static void Display(void)
{
GLfloat depth[100 * 100];
GLfloat depth2[400 * 400];
GLfloat min, max;
int i;
GLfloat depth[100 * 100 * 2];
GLfloat depth2[400 * 400]; /* *2 to test pixelstore stuff */
GLuint list;
GLenum depthType = GL_FLOAT;
glClearColor(0.5, 0.5, 0.5, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@ -36,16 +38,32 @@ static void Display(void)
glLoadIdentity();
glutSolidSphere(1.0, 20, 10);
/* read the depth image */
glReadPixels(0, 0, 100, 100, GL_DEPTH_COMPONENT, GL_FLOAT, depth);
min = max = depth[0];
for (i = 1; i < 100 * 100; i++) {
if (depth[i] < min)
min = depth[i];
if (depth[i] > max)
max = depth[i];
if (TestPacking) {
glPixelStorei(GL_PACK_ROW_LENGTH, 120);
glPixelStorei(GL_PACK_SKIP_PIXELS, 5);
}
/* read the depth image */
glReadPixels(0, 0, 100, 100, GL_DEPTH_COMPONENT, depthType, depth);
if (depthType == GL_FLOAT) {
GLfloat min, max;
int i;
min = max = depth[0];
for (i = 1; i < 100 * 100; i++) {
if (depth[i] < min)
min = depth[i];
if (depth[i] > max)
max = depth[i];
}
printf("Depth value range: [%f, %f]\n", min, max);
}
if (TestPacking) {
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
glPixelStorei(GL_UNPACK_ROW_LENGTH, 120);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 5);
}
printf("Depth value range: [%f, %f]\n", min, max);
/* draw depth image with scaling (into z buffer) */
glPixelZoom(4.0, 4.0);
@ -55,12 +73,27 @@ static void Display(void)
glPixelTransferf(GL_DEPTH_SCALE, -1.0);
glPixelTransferf(GL_DEPTH_BIAS, 1.0);
}
glDrawPixels(100, 100, GL_DEPTH_COMPONENT, GL_FLOAT, depth);
if (TestList) {
list = glGenLists(1);
glNewList(list, GL_COMPILE);
glDrawPixels(100, 100, GL_DEPTH_COMPONENT, depthType, depth);
glEndList();
glCallList(list);
glDeleteLists(list, 1);
}
else {
glDrawPixels(100, 100, GL_DEPTH_COMPONENT, depthType, depth);
}
if (Invert) {
glPixelTransferf(GL_DEPTH_SCALE, 1.0);
glPixelTransferf(GL_DEPTH_BIAS, 0.0);
}
if (TestPacking) {
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
}
glDisable(GL_DEPTH_TEST);
/* read back scaled depth image */
@ -89,6 +122,14 @@ static void Key(unsigned char key, int x, int y)
case 'i':
Invert = !Invert;
break;
case 'p':
TestPacking = !TestPacking;
printf("Test pixel pack/unpack: %d\n", TestPacking);
break;
case 'l':
TestList = !TestList;
printf("Test dlist: %d\n", TestList);
break;
case 27:
exit(0);
break;