diff options
Diffstat (limited to 'progs')
| -rw-r--r-- | progs/tests/Makefile | 1 | ||||
| -rw-r--r-- | progs/tests/zcomp.c | 223 |
2 files changed, 224 insertions, 0 deletions
diff --git a/progs/tests/Makefile b/progs/tests/Makefile index e04b95ce08..75d1eca08e 100644 --- a/progs/tests/Makefile +++ b/progs/tests/Makefile @@ -84,6 +84,7 @@ SOURCES = \ vpwarpmesh.c \ yuvrect.c \ yuvsquare.c \ + zcomp.c \ zdrawpix.c \ zreaddraw.c diff --git a/progs/tests/zcomp.c b/progs/tests/zcomp.c new file mode 100644 index 0000000000..b53079d07f --- /dev/null +++ b/progs/tests/zcomp.c @@ -0,0 +1,223 @@ +/** + * Test Z compositing with glDrawPixels(GL_DEPTH_COMPONENT) and stencil test. + */ + +#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 = 0, Yrot = 0, Zpos = 6; +static GLboolean Anim = GL_FALSE; + +static int Width = 400, Height = 200; +static GLfloat *Zimg; +static GLubyte *Cimg; +static GLboolean showZ = 0; + + +static void +Idle(void) +{ + Xrot += 3.0; + Yrot += 4.0; + glutPostRedisplay(); +} + + +/** + * Draw first object, save color+Z images + */ +static void +DrawFirst(void) +{ + static const GLfloat red[4] = { 1.0, 0.0, 0.0, 0.0 }; + + glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red); + + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glPushMatrix(); + glTranslatef(-1, 0, 0); + glRotatef(45 + Xrot, 1, 0, 0); + + glutSolidTorus(0.75, 2.0, 10, 20); + + glPopMatrix(); + + glReadPixels(0, 0, Width, Height, GL_DEPTH_COMPONENT, GL_FLOAT, Zimg); + glReadPixels(0, 0, Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, Cimg); +} + + +/** + * Draw second object. + */ +static void +DrawSecond(void) +{ + static const GLfloat blue[4] = { 0.0, 0.0, 1.0, 0.0 }; + + glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue); + + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); + + glPushMatrix(); + glTranslatef(+1, 0, 0); + glRotatef(-45 + Xrot, 1, 0, 0); + + glutSolidTorus(0.75, 2.0, 10, 20); + + glPopMatrix(); +} + + +/** + * Composite first/saved image over second rendering. + */ +static void +Composite(void) +{ + glWindowPos2i(0, 0); + + /* Draw Z values, set stencil where Z test passes */ + glEnable(GL_STENCIL_TEST); + glStencilFunc(GL_ALWAYS, 1, ~0); + glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE); + glColorMask(0,0,0,0); + glDrawPixels(Width, Height, GL_DEPTH_COMPONENT, GL_FLOAT, Zimg); + glColorMask(1,1,1,1); + + /* Draw color where stencil==1 */ + glStencilFunc(GL_EQUAL, 1, ~0); + glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); + glDisable(GL_DEPTH_TEST); + glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, Cimg); + glEnable(GL_DEPTH_TEST); + + glDisable(GL_STENCIL_TEST); +} + + +static void +Draw(void) +{ + DrawFirst(); + DrawSecond(); + Composite(); + glutSwapBuffers(); +} + + +static void +Reshape(int width, int height) +{ + GLfloat ar = (float) width / height; + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-ar, ar, -1.0, 1.0, 5.0, 30.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, -15.0); + + Width = width; + Height = height; + + if (Zimg) + free(Zimg); + if (Cimg) + free(Cimg); + Zimg = (float *) malloc(width * height * 4); + Cimg = (GLubyte *) malloc(width * height * 4); +} + + +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(Width, Height); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH | GLUT_STENCIL); + Win = glutCreateWindow(argv[0]); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutSpecialFunc(SpecialKey); + glutDisplayFunc(Draw); + if (Anim) + glutIdleFunc(Idle); + Init(); + glutMainLoop(); + return 0; +} |