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progs/tests: asst. improvements to zreaddraw.c

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This commit is contained in:
Brian Paul 2010-04-22 14:29:29 -06:00
parent 45e2b51c85
commit 9f74fa111b
1 changed files with 44 additions and 17 deletions
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61
progs/tests/zreaddraw.c
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@ -11,7 +11,16 @@
#include <GL/glew.h>
#include <GL/glut.h>
static GLint WinWidth = 500, WinHeight = 500;
#define ZWIDTH 100
#define ZHEIGHT 100
#define ZOOM 4
#define ZWIDTH2 (ZOOM * ZWIDTH)
#define ZHEIGHT2 (ZOOM * ZHEIGHT)
static GLint WinWidth = ZWIDTH + ZWIDTH2, WinHeight = ZHEIGHT + ZHEIGHT2;
static GLboolean Invert = GL_FALSE;
static GLboolean TestPacking = GL_FALSE;
static GLboolean TestList = GL_FALSE;
@ -19,8 +28,8 @@ static GLboolean TestList = GL_FALSE;
static void Display(void)
{
GLfloat depth[100 * 100 * 2];
GLfloat depth2[400 * 400]; /* *2 to test pixelstore stuff */
GLfloat depth[ZWIDTH * ZHEIGHT * 2];
GLfloat depth2[ZWIDTH2 * ZHEIGHT2]; /* *2 to test pixelstore stuff */
GLuint list;
GLenum depthType = GL_FLOAT;
@ -30,7 +39,7 @@ static void Display(void)
glEnable(GL_DEPTH_TEST);
/* draw a sphere */
glViewport(0, 0, 100, 100);
glViewport(0, 0, ZWIDTH, ZHEIGHT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1, 1, -1, 1, -1, 0); /* clip away back half of sphere */
@ -44,12 +53,12 @@ static void Display(void)
}
/* read the depth image */
glReadPixels(0, 0, 100, 100, GL_DEPTH_COMPONENT, depthType, depth);
glReadPixels(0, 0, ZWIDTH, ZHEIGHT, 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++) {
for (i = 1; i < ZWIDTH * ZHEIGHT; i++) {
if (depth[i] < min)
min = depth[i];
if (depth[i] > max)
@ -58,9 +67,22 @@ static void Display(void)
printf("Depth value range: [%f, %f]\n", min, max);
}
/* debug */
if (0) {
int i;
float *z = depth + ZWIDTH * 50;
printf("z at y=50:\n");
for (i = 0; i < ZWIDTH; i++) {
printf("%5.3f ", z[i]);
if ((i + 1) % 12 == 0)
printf("\n");
}
printf("\n");
}
/* Draw the Z image as luminance above original rendering */
glWindowPos2i(0, 100);
glDrawPixels(100, 100, GL_LUMINANCE, depthType, depth);
glWindowPos2i(0, ZHEIGHT);
glDrawPixels(ZWIDTH, ZHEIGHT, GL_LUMINANCE, depthType, depth);
if (TestPacking) {
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
@ -70,9 +92,9 @@ static void Display(void)
}
/* draw depth image with scaling (into z buffer) */
glPixelZoom(4.0, 4.0);
glPixelZoom(ZOOM, ZOOM);
glColor4f(1, 0, 0, 0);
glWindowPos2i(100, 0);
glWindowPos2i(ZWIDTH, 0);
if (Invert) {
glPixelTransferf(GL_DEPTH_SCALE, -1.0);
glPixelTransferf(GL_DEPTH_BIAS, 1.0);
@ -80,13 +102,13 @@ static void Display(void)
if (TestList) {
list = glGenLists(1);
glNewList(list, GL_COMPILE);
glDrawPixels(100, 100, GL_DEPTH_COMPONENT, depthType, depth);
glDrawPixels(ZWIDTH, ZHEIGHT, GL_DEPTH_COMPONENT, depthType, depth);
glEndList();
glCallList(list);
glDeleteLists(list, 1);
}
else {
glDrawPixels(100, 100, GL_DEPTH_COMPONENT, depthType, depth);
glDrawPixels(ZWIDTH, ZHEIGHT, GL_DEPTH_COMPONENT, depthType, depth);
}
if (Invert) {
glPixelTransferf(GL_DEPTH_SCALE, 1.0);
@ -101,24 +123,25 @@ static void Display(void)
glDisable(GL_DEPTH_TEST);
/* read back scaled depth image */
glReadPixels(100, 0, 400, 400, GL_DEPTH_COMPONENT, GL_FLOAT, depth2);
glReadPixels(ZWIDTH, 0, ZWIDTH2, ZHEIGHT2, GL_DEPTH_COMPONENT, GL_FLOAT, depth2);
/* debug */
if (0) {
int i;
float *z = depth2 + 400 * 200;
float *z = depth2 + ZWIDTH2 * 200;
printf("z at y=200:\n");
for (i = 0; i < 400; i++) {
for (i = 0; i < ZWIDTH2; i++) {
printf("%5.3f ", z[i]);
if ((i + 1) % 12 == 0)
printf("\n");
}
printf("\n");
}
/* draw as luminance */
glPixelZoom(1.0, 1.0);
glWindowPos2i(100, 0);
glDrawPixels(400, 400, GL_LUMINANCE, GL_FLOAT, depth2);
glWindowPos2i(ZWIDTH, 0);
glDrawPixels(ZWIDTH2, ZHEIGHT2, GL_LUMINANCE, GL_FLOAT, depth2);
glutSwapBuffers();
}
@ -162,9 +185,13 @@ static void Init(void)
const GLfloat gray[4] = {0.2, 0.2, 0.2, 1.0};
const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
const GLfloat pos[4] = {0, 0, 10, 0};
GLint z;
glGetIntegerv(GL_DEPTH_BITS, &z);
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
printf("GL_DEPTH_BITS = %d\n", z);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, blue);
glLightfv(GL_LIGHT0, GL_AMBIENT, gray);