diff options
| -rw-r--r-- | progs/tests/Makefile | 1 | ||||
| -rw-r--r-- | progs/tests/zdrawpix.c | 192 |
2 files changed, 193 insertions, 0 deletions
diff --git a/progs/tests/Makefile b/progs/tests/Makefile index 27e2eafdfcb..e04b95ce085 100644 --- a/progs/tests/Makefile +++ b/progs/tests/Makefile @@ -84,6 +84,7 @@ SOURCES = \ vpwarpmesh.c \ yuvrect.c \ yuvsquare.c \ + zdrawpix.c \ zreaddraw.c PROGS = $(SOURCES:%.c=%) diff --git a/progs/tests/zdrawpix.c b/progs/tests/zdrawpix.c new file mode 100644 index 00000000000..dd222e7dd0b --- /dev/null +++ b/progs/tests/zdrawpix.c @@ -0,0 +1,192 @@ +/** + * Test glDrawPixels(GL_DEPTH_COMPONENT) + * + * We load a window-sized buffer of Z values so that Z=1 at the top and + * Z=0 at the bottom (and interpolate between). + * We draw that image into the Z buffer, then draw an ordinary cube. + * The bottom part of the cube should be "clipped" where the cube fails + * the Z test. + * + * Press 'd' to view the Z buffer as a grayscale image. + */ + +#define GL_GLEXT_PROTOTYPES +#include <stdio.h> +#include <stdlib.h> +#include <math.h> +#include <GL/glut.h> +#include "../util/showbuffer.c" + + +static int Win; +static GLfloat Xrot = 50, Yrot = 40, Zpos = 6; +static GLboolean Anim = GL_FALSE; + +static int Width = 200, Height = 200; +static GLfloat *z; +static GLboolean showZ = 0; + + +static void +Idle(void) +{ + Xrot += 3.0; + Yrot += 4.0; + glutPostRedisplay(); +} + + +static void +Draw(void) +{ + glClearColor(0, 0, 0.5, 0); + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + +#if 1 + glColor3f(1, 0, 0); + glWindowPos2i(0,0); + glColorMask(0,0,0,0); + glDrawPixels(Width, Height, GL_DEPTH_COMPONENT, GL_FLOAT, z); +#elif 0 + glPushMatrix(); + glTranslatef(-0.75, 0, Zpos); + glutSolidSphere(1.0, 20, 10); + glPopMatrix(); +#endif + glColorMask(1,1,1,1); + + /* draw cube */ + glPushMatrix(); + glTranslatef(0, 0, Zpos); + glRotatef(Xrot, 1, 0, 0); + glRotatef(Yrot, 0, 1, 0); + glutSolidCube(2.0); + glPopMatrix(); + +#if 0 + /* drawpixels after cube */ + glColor3f(1, 0, 0); + glWindowPos2i(0,0); + //glColorMask(0,0,0,0); + glDrawPixels(Width, Height, GL_DEPTH_COMPONENT, GL_FLOAT, z); +#endif + + if (showZ) { + ShowDepthBuffer(Width, Height, 0.0, 1.0); + } + + glutSwapBuffers(); +} + + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 30.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, -15.0); + + Width = width; + Height = height; + + z = (float *) malloc(width * height * 4); + { + int i, j, k = 0; + for (i = 0; i < height; i++) { + float zval = (float) i / (height - 1); + for (j = 0; j < width; j++) { + z[k++] = zval; + } + } + } +} + + +static void +Key(unsigned char key, int x, int y) +{ + const GLfloat step = 1.0; + (void) x; + (void) y; + switch (key) { + case 'a': + Anim = !Anim; + if (Anim) + glutIdleFunc(Idle); + else + glutIdleFunc(NULL); + break; + case 'd': + showZ = !showZ; + break; + case 'z': + Zpos -= step; + break; + case 'Z': + Zpos += step; + break; + case 27: + glutDestroyWindow(Win); + exit(0); + break; + } + glutPostRedisplay(); +} + + +static void +SpecialKey(int key, int x, int y) +{ + const GLfloat step = 3.0; + (void) x; + (void) y; + switch (key) { + case GLUT_KEY_UP: + Xrot -= step; + break; + case GLUT_KEY_DOWN: + Xrot += step; + break; + case GLUT_KEY_LEFT: + Yrot -= step; + break; + case GLUT_KEY_RIGHT: + Yrot += step; + break; + } + glutPostRedisplay(); +} + + +static void +Init(void) +{ + /* setup lighting, etc */ + glEnable(GL_DEPTH_TEST); + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); +} + + +int +main(int argc, char *argv[]) +{ + glutInit(&argc, argv); + glutInitWindowPosition(0, 0); + glutInitWindowSize(400, 400); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); + Win = glutCreateWindow(argv[0]); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutSpecialFunc(SpecialKey); + glutDisplayFunc(Draw); + if (Anim) + glutIdleFunc(Idle); + Init(); + glutMainLoop(); + return 0; +} |