started writing some 3d pipeline stuff

[dosdemo] / src / 3dgfx.h

diff --git a/src/3dgfx.h b/src/3dgfx.h
new file mode 100644 (file)
index 0000000..a6b3645
--- /dev/null
+++ b/src/3dgfx.h
@@ -0,0 +1,70 @@
+#ifndef THREEDGFX_H_
+#define THREEDGFX_H_
+
+struct g3d_vertex {
+       float x, y, z, w;
+       float nx, ny, nz;
+       float u, v;
+       unsigned char r, g, b;
+};
+
+enum {
+       G3D_POINTS = 1,
+       G3D_LINES = 2,
+       G3D_TRIANGLES = 3,
+       G3D_QUADS = 4
+};
+
+/* g3d_enable/g3d_disable bits */
+enum {
+       G3D_CULL_FACE = 1,
+       G3D_DEPTH_TEST = 2,     /* XXX not implemented */
+       G3D_LIGHTING = 4,
+       G3D_TEXTURE = 8,
+
+       G3D_ALL = 0x7fffffff
+};
+
+/* 2nd arg to g3d_draw: which space are input verts in. skips parts of the pipeline */
+enum {
+       G3D_LOCAL_SPACE, /* this being 0 makes a nice default arg. */
+       G3D_WORLD_SPACE, /* ignore world matrix */
+       G3D_VIEW_SPACE,  /* ignore view matrix */
+       G3D_CLIP_SPACE,  /* ignore projection matrix */
+       G3D_SCREEN_SPACE,/* 2D verts, don't divide by w */
+       G3D_PIXEL_SPACE  /* in pixel units, ignore viewport */
+};
+
+/* matrix stacks */
+enum {
+       G3D_WORLD,
+       G3D_VIEW,
+       G3D_PROJECTION,
+
+       G3D_NUM_MATRICES
+};
+
+void g3d_init(void);
+
+void g3d_framebuffer(int width, int height, void *pixels);
+
+void g3d_enable(unsigned int opt);
+void g3d_disable(unsigned int opt);
+void g3d_setopt(unsigned int opt, unsigned int mask);
+unsigned int g3d_getopt(unsigned int mask);
+
+void g3d_set_matrix(int which, const float *m); /* null ptr for identity */
+void g3d_mult_matrix(int which, const float *m);
+void g3d_push_matrix(int which);
+void g3d_pop_matrix(int which);
+
+void g3d_translate(float x, float y, float z);
+void g3d_rotate(float angle, float x, float y, float z);
+void g3d_scale(float x, float y, float z);
+void g3d_ortho(float left, float right, float bottom, float top, float znear, float zfar);
+void g3d_frustum(float left, float right, float bottom, float top, float znear, float zfar);
+void g3d_perspective(float vfov, float aspect, float znear, float zfar);
+
+void g3d_draw(int prim, int space, const struct g3d_vertex *varr, int num);
+
+#endif /* THREEDGFX_H_ */