added OpenGL debug/test program

[dosdemo] / tools / gltest / src / main.c

diff --git a/tools/gltest/src/main.c b/tools/gltest/src/main.c
new file mode 100644 (file)
index 0000000..82042ca
--- /dev/null
+++ b/tools/gltest/src/main.c
@@ -0,0 +1,159 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <GL/glut.h>
+#include "bsptree.h"
+#include "mesh.h"
+
+int init(void);
+void cleanup(void);
+void display(void);
+void reshape(int x, int y);
+void keydown(unsigned char key, int x, int y);
+void mouse(int bn, int st, int x, int y);
+void motion(int x, int y);
+
+static float cam_theta, cam_phi, cam_dist = 5;
+static int prev_x, prev_y;
+static int bnstate[8];
+
+/* ----------------------------------- */
+static struct g3d_mesh torus;
+static struct bsptree torus_bsp;
+/* ----------------------------------- */
+
+int main(int argc, char **argv)
+{
+       glutInit(&argc, argv);
+       glutInitWindowSize(800, 600);
+       glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
+       glutCreateWindow("OpenGL test");
+
+       glutDisplayFunc(display);
+       glutReshapeFunc(reshape);
+       glutKeyboardFunc(keydown);
+       glutMouseFunc(mouse);
+       glutMotionFunc(motion);
+
+       if(init() == -1) {
+               return 1;
+       }
+       atexit(cleanup);
+
+       glutMainLoop();
+       return 0;
+}
+
+int init(void)
+{
+       glEnable(GL_DEPTH_TEST);
+       glEnable(GL_CULL_FACE);
+       glEnable(GL_LIGHTING);
+       glEnable(GL_LIGHT0);
+
+       gen_torus_mesh(&torus, 1.0, 0.25, 24, 12);
+
+       init_bsp(&torus_bsp);
+       if(bsp_add_mesh(&torus_bsp, &torus) == -1) {
+               fprintf(stderr, "failed to construct torus BSP tree\n");
+               return -1;
+       }
+
+       return 0;
+}
+
+void cleanup(void)
+{
+       free(torus.varr);
+       free(torus.iarr);
+       destroy_bsp(&torus_bsp);
+}
+
+void display(void)
+{
+       float vdir[3];
+       float mat[16];
+
+       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+       glMatrixMode(GL_MODELVIEW);
+       glLoadIdentity();
+       glTranslatef(0, 0, -cam_dist);
+       glRotatef(cam_phi, 1, 0, 0);
+       glRotatef(cam_theta, 0, 1, 0);
+
+       glGetFloatv(GL_MODELVIEW_MATRIX, mat);
+       vdir[0] = -mat[2];
+       vdir[1] = -mat[6];
+       vdir[2] = -mat[10];
+
+       //g3d_draw_indexed(torus.prim, torus.varr, torus.vcount, torus.iarr, torus.icount);
+       draw_bsp(&torus_bsp, vdir[0], vdir[1], vdir[2]);
+
+       glutSwapBuffers();
+}
+
+void reshape(int x, int y)
+{
+       glViewport(0, 0, x, y);
+       glMatrixMode(GL_PROJECTION);
+       glLoadIdentity();
+       gluPerspective(50, (float)x / (float)y, 0.5, 500.0);
+}
+
+void keydown(unsigned char key, int x, int y)
+{
+       switch(key) {
+       case 27:
+               exit(0);
+       }
+}
+
+void mouse(int bn, int st, int x, int y)
+{
+       prev_x = x;
+       prev_y = y;
+       bnstate[bn - GLUT_LEFT] = st == GLUT_DOWN ? 1 : 0;
+}
+
+void motion(int x, int y)
+{
+       int dx = x - prev_x;
+       int dy = y - prev_y;
+       prev_x = x;
+       prev_y = y;
+
+       if(!dx && !dy) return;
+
+       if(bnstate[0]) {
+               cam_theta += dx * 0.5;
+               cam_phi += dy * 0.5;
+
+               if(cam_phi < -90) cam_phi = -90;
+               if(cam_phi > 90) cam_phi = 90;
+               glutPostRedisplay();
+       }
+       if(bnstate[2]) {
+               cam_dist += dy * 0.1;
+
+               if(cam_dist < 0.0f) cam_dist = 0.0f;
+               glutPostRedisplay();
+       }
+}
+
+/* dummy functions to allow linking with all the demo code */
+void swap_buffers(void *buf)
+{
+}
+
+unsigned int get_msec(void)
+{
+       return glutGet(GLUT_ELAPSED_TIME);
+}
+
+void wait_vsync(void)
+{
+}
+
+void demo_quit(void)
+{
+}