48 compute_plane(const GLfloat v0[], const GLfloat v1[], const GLfloat v2[],  in compute_plane()
49               GLfloat z0, GLfloat z1, GLfloat z2, GLfloat plane[4])  in compute_plane()
51    const GLfloat px = v1[0] - v0[0];  in compute_plane()
52    const GLfloat py = v1[1] - v0[1];  in compute_plane()
53    const GLfloat pz = z1 - z0;  in compute_plane()
55    const GLfloat qx = v2[0] - v0[0];  in compute_plane()
56    const GLfloat qy = v2[1] - v0[1];  in compute_plane()
57    const GLfloat qz = z2 - z0;  in compute_plane()
60    const GLfloat a = py * qz - pz * qy;  in compute_plane()
61    const GLfloat b = pz * qx - px * qz;  in compute_plane()
62    const GLfloat c = px * qy - py * qx;  in compute_plane()
68    const GLfloat d = -(a * v0[0] + b * v0[1] + c * z0);  in compute_plane()
81 constant_plane(GLfloat value, GLfloat plane[4])  in constant_plane()
102 static inline GLfloat
103 solve_plane(GLfloat x, GLfloat y, const GLfloat plane[4])  in solve_plane()
117 static inline GLfloat
118 solve_plane_recip(GLfloat x, GLfloat y, const GLfloat plane[4])  in solve_plane_recip()
120    const GLfloat denom = plane[3] + plane[0] * x + plane[1] * y;  in solve_plane_recip()
132 solve_plane_chan(GLfloat x, GLfloat y, const GLfloat plane[4])  in solve_plane_chan()
134    const GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2];  in solve_plane_chan()
147 static inline GLfloat
148 plane_dx(const GLfloat plane[4])  in plane_dx()
153 static inline GLfloat
154 plane_dy(const GLfloat plane[4])  in plane_dy()
166 static GLfloat
167 compute_coveragef(const GLfloat v0[3], const GLfloat v1[3],  in compute_coveragef()
168                   const GLfloat v2[3], GLint winx, GLint winy)  in compute_coveragef()
186    static const GLfloat samples[16][2] = {  in compute_coveragef()
207    const GLfloat x = (GLfloat) winx;  in compute_coveragef()
208    const GLfloat y = (GLfloat) winy;  in compute_coveragef()
209    const GLfloat dx0 = v1[0] - v0[0];  in compute_coveragef()
210    const GLfloat dy0 = v1[1] - v0[1];  in compute_coveragef()
211    const GLfloat dx1 = v2[0] - v1[0];  in compute_coveragef()
212    const GLfloat dy1 = v2[1] - v1[1];  in compute_coveragef()
213    const GLfloat dx2 = v0[0] - v2[0];  in compute_coveragef()
214    const GLfloat dy2 = v0[1] - v2[1];  in compute_coveragef()
216    GLfloat insideCount = 16.0F;  in compute_coveragef()
221       const GLfloat sx = x + samples[i][0];  in compute_coveragef()
222       const GLfloat sy = y + samples[i][1];  in compute_coveragef()
224       GLfloat cross = (dx0 * (sy - v0[1]) - dy0 * (sx - v0[0]));  in compute_coveragef()