Commit 5e34fd68c0835a38c827bfcb1647b6d62db08532
2023-12-08T18:59:48
fix the earth
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diff --git a/libc3/window/sdl2/gl_sphere.c b/libc3/window/sdl2/gl_sphere.c
index 770b11c..8b07c3d 100644
--- a/libc3/window/sdl2/gl_sphere.c
+++ b/libc3/window/sdl2/gl_sphere.c
@@ -105,6 +105,7 @@ void gl_sphere_render (const s_gl_sphere *sphere)
assert(sphere);
seg_u = sphere->segments_u;
seg_v = sphere->segments_v;
+ glDisable(GL_CULL_FACE);
// first row
glBegin(GL_QUAD_STRIP);
tex_coord[0].y = 0.0;
@@ -113,7 +114,7 @@ void gl_sphere_render (const s_gl_sphere *sphere)
j = 0;
while (j < seg_u + 1) {
p[1] = sphere->vertex + j % seg_u;
- tex_coord[0].x = tex_coord[1].x = (f64) j / seg_u;
+ tex_coord[0].x = tex_coord[1].x = (f64) (seg_u - j) / seg_u;
gl_tex_coord_2d(tex_coord);
gl_normal_3d(p[0]);
gl_vertex_3d(p[0]);
@@ -133,7 +134,7 @@ void gl_sphere_render (const s_gl_sphere *sphere)
while (j < seg_u + 1) {
p[0] = sphere->vertex + i * seg_u + j % seg_u;
p[1] = sphere->vertex + (i - 1) * seg_u + j % seg_u;
- tex_coord[0].x = tex_coord[1].x = (f64) j / seg_u;
+ tex_coord[0].x = tex_coord[1].x = (f64) (seg_u - j) / seg_u;
gl_tex_coord_2d(tex_coord);
gl_normal_3d(p[0]);
gl_vertex_3d(p[0]);
@@ -153,7 +154,7 @@ void gl_sphere_render (const s_gl_sphere *sphere)
j = 0;
while (j < seg_u + 1) {
p[1] = sphere->vertex + (seg_v - 1) * seg_u + j % seg_u;
- tex_coord[0].x = tex_coord[1].x = (f64) j / seg_u;
+ tex_coord[0].x = tex_coord[1].x = (f64) (seg_u - j) / seg_u;
gl_tex_coord_2d(tex_coord);
gl_normal_3d(p[0]);
gl_vertex_3d(p[0]);