added OpenGL debug/test program

[dosdemo] / tools / gltest / src / g3demu.c

diff --git a/tools/gltest/src/g3demu.c b/tools/gltest/src/g3demu.c
new file mode 100644 (file)
index 0000000..1068615
--- /dev/null
+++ b/tools/gltest/src/g3demu.c
@@ -0,0 +1,120 @@
+#include <string.h>
+#include <GL/gl.h>
+#include "3dgfx.h"
+
+void g3d_matrix_mode(int mmode)
+{
+       switch(mmode) {
+       case G3D_MODELVIEW:
+               glMatrixMode(GL_MODELVIEW);
+               break;
+       case G3D_PROJECTION:
+               glMatrixMode(GL_PROJECTION);
+               break;
+       }
+}
+
+void g3d_push_matrix(void)
+{
+       glPushMatrix();
+}
+
+void g3d_pop_matrix(void)
+{
+       glPopMatrix();
+}
+
+void g3d_load_identity(void)
+{
+       glLoadIdentity();
+}
+
+const float *g3d_get_matrix(int which, float *mret)
+{
+       static float tmp[16];
+
+       switch(which) {
+       case G3D_MODELVIEW:
+               glGetFloatv(GL_MODELVIEW_MATRIX, tmp);
+               break;
+
+       case G3D_PROJECTION:
+               glGetFloatv(GL_PROJECTION_MATRIX, tmp);
+               break;
+       }
+
+       if(mret) {
+               memcpy(mret, tmp, sizeof tmp);
+       }
+       return tmp;
+}
+
+void g3d_translate(float x, float y, float z)
+{
+       glTranslatef(x, y, z);
+}
+
+void g3d_rotate(float angle, float x, float y, float z)
+{
+       glRotatef(angle, x, y, z);
+}
+
+void g3d_scale(float x, float y, float z)
+{
+       glScalef(x, y, z);
+}
+
+void g3d_draw(int prim, const struct g3d_vertex *varr, int varr_size)
+{
+       g3d_draw_indexed(prim, varr, varr_size, 0, 0);
+}
+
+void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
+               const uint16_t *iarr, int iarr_size)
+{
+       int i, j, nfaces;
+       int glprim;
+       const struct g3d_vertex *vptr = varr;
+       const uint16_t *iptr = iarr;
+
+       switch(prim) {
+       case G3D_TRIANGLES:
+               glprim = GL_TRIANGLES;
+               break;
+       case G3D_QUADS:
+               glprim = GL_QUADS;
+               break;
+       default:
+               glprim = GL_POLYGON;
+       }
+
+       nfaces = (iarr ? iarr_size : varr_size) / prim;
+       if(prim <= 4) {
+               glBegin(glprim);
+       }
+
+       for(i=0; i<nfaces; i++) {
+               if(glprim == GL_POLYGON) {
+                       glBegin(GL_POLYGON);
+               }
+
+               for(j=0; j<prim; j++) {
+                       if(iarr) {
+                               vptr = varr + *iptr++;
+                       }
+                       glNormal3f(vptr->nx, vptr->ny, vptr->nz);
+                       glColor4b(vptr->r, vptr->g, vptr->b, vptr->a);
+                       glTexCoord2f(vptr->u, vptr->v);
+                       glVertex4f(vptr->x, vptr->y, vptr->z, vptr->w);
+                       ++vptr;
+               }
+
+               if(glprim == GL_POLYGON) {
+                       glEnd();
+               }
+       }
+
+       if(prim <= 4) {
+               glEnd();
+       }
+}