C++ (Cpp) gl_clipcode Examples

Example #1

File: vertex.c Project: bhdminh/uGFX

/* TODO : handle all cases */
static inline void gl_vertex_transform(GLContext * c, GLVertex * v)
{
    float *m;
    V4 *n;

    if (c->lighting_enabled) {
	/* eye coordinates needed for lighting */

	m = &c->matrix_stack_ptr[0]->m[0][0];
	v->ec.X = (v->coord.X * m[0] + v->coord.Y * m[1] +
		   v->coord.Z * m[2] + m[3]);
	v->ec.Y = (v->coord.X * m[4] + v->coord.Y * m[5] +
		   v->coord.Z * m[6] + m[7]);
	v->ec.Z = (v->coord.X * m[8] + v->coord.Y * m[9] +
		   v->coord.Z * m[10] + m[11]);
	v->ec.W = (v->coord.X * m[12] + v->coord.Y * m[13] +
		   v->coord.Z * m[14] + m[15]);

	/* projection coordinates */
	m = &c->matrix_stack_ptr[1]->m[0][0];
	v->pc.X = (v->ec.X * m[0] + v->ec.Y * m[1] +
		   v->ec.Z * m[2] + v->ec.W * m[3]);
	v->pc.Y = (v->ec.X * m[4] + v->ec.Y * m[5] +
		   v->ec.Z * m[6] + v->ec.W * m[7]);
	v->pc.Z = (v->ec.X * m[8] + v->ec.Y * m[9] +
		   v->ec.Z * m[10] + v->ec.W * m[11]);
	v->pc.W = (v->ec.X * m[12] + v->ec.Y * m[13] +
		   v->ec.Z * m[14] + v->ec.W * m[15]);

	m = &c->matrix_model_view_inv.m[0][0];
	n = &c->current_normal;

	v->normal.X = (n->X * m[0] + n->Y * m[1] + n->Z * m[2]);
	v->normal.Y = (n->X * m[4] + n->Y * m[5] + n->Z * m[6]);
	v->normal.Z = (n->X * m[8] + n->Y * m[9] + n->Z * m[10]);

	if (c->normalize_enabled) {
	    gl_V3_Norm(&v->normal);
	}
    } else {
	/* no eye coordinates needed, no normal */
	/* NOTE: W = 1 is assumed */
	m = &c->matrix_model_projection.m[0][0];

	v->pc.X = (v->coord.X * m[0] + v->coord.Y * m[1] +
		   v->coord.Z * m[2] + m[3]);
	v->pc.Y = (v->coord.X * m[4] + v->coord.Y * m[5] +
		   v->coord.Z * m[6] + m[7]);
	v->pc.Z = (v->coord.X * m[8] + v->coord.Y * m[9] +
		   v->coord.Z * m[10] + m[11]);
	if (c->matrix_model_projection_no_w_transform) {
	    v->pc.W = m[15];
	} else {
	    v->pc.W = (v->coord.X * m[12] + v->coord.Y * m[13] +
		       v->coord.Z * m[14] + m[15]);
	}
    }

    v->clip_code = gl_clipcode(v->pc.X, v->pc.Y, v->pc.Z, v->pc.W);
}

Example #2

File: clip.cpp Project: Botje/residualvm

static inline void updateTmp(GLContext *c, GLVertex *q, GLVertex *p0, GLVertex *p1, float t) {
	interpolate_color(c, q, p0, p1, t);

	if (c->texture_2d_enabled) {
		// NOTE: This could be implemented with operator overloading,
		// but i'm not 100% sure that we can completely disregard Z and W components so I'm leaving it like this for now.
		q->tex_coord.X = (p0->tex_coord.X + (p1->tex_coord.X - p0->tex_coord.X) * t);
		q->tex_coord.Y = (p0->tex_coord.Y + (p1->tex_coord.Y - p0->tex_coord.Y) * t);
	}

	q->clip_code = gl_clipcode(q->pc.X, q->pc.Y, q->pc.Z, q->pc.W);
	if (q->clip_code == 0)
		gl_transform_to_viewport(c, q);
}