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mirror of https://github.com/Nexoniarz/Fry3DX.git synced 2026-11-03 04:24:26 +00:00
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The grid worked out for each pixel (as in Blender): one square on its plane, every set of lines showing everywhere their lines are far enough apart on the screen (no patch round the middle, no pieces smearing or fading as you move), a pixel or so wide and smooth, the axes in the colour of the world's axis they run along; in every renderer (drawGrid: a sprite marked by its colour's alpha)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Nexoniarz 2026-10-21 17:18:13 +02:00
commit b2fc0437bc
6 changed files with 101 additions and 70 deletions
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5
engine/shaders/sprite.vert
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@ -9,17 +9,20 @@ PUSH_BLOCK {
vec4 up; // camera up, w = texture index (bits)
} pc;
layout(location = 0) out vec2 v_uv;
layout(location = 1) out vec3 v_world;
const vec2 kQuad[6] = vec2[](vec2(-1,-1), vec2(1,-1), vec2(1,1), vec2(-1,-1), vec2(1,1), vec2(-1,1));
void main() {
vec2 q = kQuad[VERTEX_ID];
float c = cos(pc.right.w), s = sin(pc.right.w);
vec2 r = vec2(c * q.x - s * q.y, s * q.x + c * q.y);
vec3 world = pc.posSize.xyz + (pc.right.xyz * r.x + pc.up.xyz * r.y) * pc.posSize.w;
if (pc.posSize.w < 0.0) { // a streak: right.xyz the eye, w its half width at the far end; each end's side faces the eye
if (pc.color.a < 0.0) world = pc.posSize.xyz + (pc.right.xyz * q.x + pc.up.xyz * q.y) * pc.posSize.w; // a grid: a square on its plane
else if (pc.posSize.w < 0.0) { // a streak: right.xyz the eye, w its half width at the far end; each end's side faces the eye
vec3 end = pc.posSize.xyz + pc.up.xyz * q.y, side = cross(pc.up.xyz, pc.right.xyz - end);
world = end + (length(side) > 1e-9 ? normalize(side) : vec3(0.0, 0.0, 1.0)) * q.x * (q.y < 0.0 ? -pc.posSize.w : pc.right.w);
}
v_uv = q * 0.5 + 0.5;
v_uv.y = 1.0 - v_uv.y;
v_world = world;
gl_Position = pc.viewProj * vec4(world, 1.0);
}