+++ /dev/null
-/*
- * Test glRead/DrawPixels for GL_DEPTH_COMPONENT, with pixelzoom.
- *
- * Brian Paul
- * 23 August 2003
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <math.h>
-#include <GL/glew.h>
-#include <GL/glut.h>
-
-
-#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;
-
-
-static void Display(void)
-{
- GLfloat depth[ZWIDTH * ZHEIGHT * 2];
- GLfloat depth2[ZWIDTH2 * ZHEIGHT2]; /* *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);
-
- glEnable(GL_DEPTH_TEST);
-
- /* draw a sphere */
- glViewport(0, 0, ZWIDTH, ZHEIGHT);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glOrtho(-1, 1, -1, 1, -1, 0); /* clip away back half of sphere */
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glutSolidSphere(1.0, 20, 10);
-
- if (TestPacking) {
- glPixelStorei(GL_PACK_ROW_LENGTH, 120);
- glPixelStorei(GL_PACK_SKIP_PIXELS, 5);
- }
-
- /* read the depth image */
- 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 < ZWIDTH * ZHEIGHT; i++) {
- if (depth[i] < min)
- min = depth[i];
- if (depth[i] > max)
- max = depth[i];
- }
- 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, ZHEIGHT);
- glDrawPixels(ZWIDTH, ZHEIGHT, GL_LUMINANCE, depthType, depth);
-
- 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);
- }
-
- /* draw depth image with scaling (into z buffer) */
- glPixelZoom(ZOOM, ZOOM);
- glColor4f(1, 0, 0, 0);
- glWindowPos2i(ZWIDTH, 0);
- if (Invert) {
- glPixelTransferf(GL_DEPTH_SCALE, -1.0);
- glPixelTransferf(GL_DEPTH_BIAS, 1.0);
- }
- if (TestList) {
- list = glGenLists(1);
- glNewList(list, GL_COMPILE);
- glDrawPixels(ZWIDTH, ZHEIGHT, GL_DEPTH_COMPONENT, depthType, depth);
- glEndList();
- glCallList(list);
- glDeleteLists(list, 1);
- }
- else {
- glDrawPixels(ZWIDTH, ZHEIGHT, 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 */
- glReadPixels(ZWIDTH, 0, ZWIDTH2, ZHEIGHT2, GL_DEPTH_COMPONENT, GL_FLOAT, depth2);
-
- /* debug */
- if (0) {
- int i;
- float *z = depth2 + ZWIDTH2 * 200;
- printf("z at y=200:\n");
- 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(ZWIDTH, 0);
- glDrawPixels(ZWIDTH2, ZHEIGHT2, GL_LUMINANCE, GL_FLOAT, depth2);
-
- glutSwapBuffers();
-}
-
-
-static void Reshape(int width, int height)
-{
- WinWidth = width;
- WinHeight = height;
- glViewport(0, 0, width, height);
-}
-
-
-static void Key(unsigned char key, int x, int y)
-{
- (void) x;
- (void) y;
- switch (key) {
- 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;
- }
- glutPostRedisplay();
-}
-
-
-static void Init(void)
-{
- const GLfloat blue[4] = {.1, .1, 1.0, 1.0};
- 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);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, white);
- glLightfv(GL_LIGHT0, GL_POSITION, pos);
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
-}
-
-
-int main(int argc, char *argv[])
-{
- glutInit(&argc, argv);
- glutInitWindowPosition(0, 0);
- glutInitWindowSize(WinWidth, WinHeight);
- glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
- glutCreateWindow(argv[0]);
- glewInit();
- glutReshapeFunc(Reshape);
- glutKeyboardFunc(Key);
- glutDisplayFunc(Display);
- Init();
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff