1 files changed, 55 insertions, 0 deletions
diff --git a/res/shaders/line.fs b/res/shaders/line.fs
new file mode 100644
index 0000000..04cba86
--- /dev/null
+++ b/res/shaders/line.fs
@@ -0,0 +1,55 @@
+#version 420 core
+
+uniform vec4 _u_colour;
+
+layout(std140, binding = 0) uniform _u_globals {
+    mat4 proj;
+    mat4 view;
+    vec4 frustum[6];
+    float znear;
+    float zfar;
+    float xfov;
+    float yfov;
+    int time;
+    float xwindow;
+    float ywindow;
+};
+layout(binding = 2) uniform sampler2D main_colour;
+layout(binding = 3) uniform sampler2D main_depth;
+
+out vec4 _o_colour;
+
+vec4 texture_sample(const sampler2D sampler, const vec2 coord) {
+    return texture(sampler, coord);
+}
+
+float depth_sample(const sampler2D sampler, const vec2 coord) {
+    return texture(sampler, coord).r;
+}
+
+void main() {
+    const vec2 coords = vec2(gl_FragCoord.x / xwindow, gl_FragCoord.y / ywindow);
+
+    const float cur_depth = depth_sample(main_depth, coords);
+    gl_FragDepth = gl_FragCoord.z * 0.9999f;
+    if (gl_FragDepth > cur_depth) {
+        discard;
+    }
+
+    _o_colour = vec4(0.0f, 0.0f, 0.0f, 1.0f);
+
+    // This is for dynamically choosing a higher contrast colour, but it's not
+    // that nice of an effect so it's commented out.
+    /*
+    const vec2 coords = vec2(gl_FragCoord.x / xwindow, gl_FragCoord.y / ywindow);
+    const float cur_depth = depth_sample(main_depth, coords);
+    gl_FragDepth = gl_FragCoord.z * 0.9999f;
+    if (gl_FragDepth > cur_depth) {
+        discard;
+    }
+
+    const vec4 cur_tex = texture_sample(main_colour, coords);
+    const float clr = (1.0f - (cur_tex.r + cur_tex.g + cur_tex.b) / 3.0f) > 0.5f ? 1.0f : 0.0f;
+    _o_colour = vec4(clr, clr, clr, 1.0f);
+    */
+}