ddidderr
568ce784f9
Ports the terminal-independent half of ZIG/src/renderer (OpenGL only): - opengl/*: buffers, frames, pipelines, render passes, samplers, targets, textures and the OpenGL GraphicsAPI backend on top of glow; the GTK GLArea glue is replaced by a get_proc_address loader closure - the GLSL shaders, copied verbatim and embedded; uniform/vertex structs as bytemuck Pod types with std140 offsets asserted in tests - shadertoy custom shaders converted with naga (GLSL in -> validate -> GLSL 430 out) instead of glslang + spirv-cross - size (screen/grid/cell/padding math), cursor style logic, backend health, options and message types The crate opts into unsafe_code = "deny"; unsafe glow calls live only in opengl/gl.rs. A headless EGL integration test builds every pipeline and the converted shadertoy shaders on Mesa and reads back rendered pixels. Note: Zig's shadertoy Uniforms order the selection background/foreground colors opposite to the GLSL block (likely an upstream bug); kept as in Zig for parity and recorded in the notes. Deferred to the next renderer pass: generic, cell, image, link, row, State, Thread, Overlay (need terminal render state). Test Plan: - cargo test -p ghostty-renderer (33 tests incl. tests/egl_headless.rs)
35 lines
951 B
Rust
35 lines
951 B
Rust
//! Math helpers (`src/math.zig`), only what the renderer needs.
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/// A 4x4 matrix as four column vectors (same layout as Zig's `[4]@Vector(4, f32)`).
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pub type Mat = [[f32; 4]; 4];
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/// 2D orthographic projection matrix
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pub fn ortho2d(left: f32, right: f32, bottom: f32, top: f32) -> Mat {
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let w = right - left;
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let h = top - bottom;
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[
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[2.0 / w, 0.0, 0.0, 0.0],
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[0.0, 2.0 / h, 0.0, 0.0],
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[0.0, 0.0, -1.0, 0.0],
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[-(right + left) / w, -(top + bottom) / h, 0.0, 1.0],
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]
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn ortho2d_maps_corners() {
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let m = ortho2d(0.0, 800.0, 600.0, 0.0);
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let apply = |x: f32, y: f32| {
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(
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m[0][0] * x + m[1][0] * y + m[3][0],
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m[0][1] * x + m[1][1] * y + m[3][1],
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)
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};
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assert_eq!(apply(0.0, 0.0), (-1.0, 1.0));
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assert_eq!(apply(800.0, 600.0), (1.0, -1.0));
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}
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}
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