From 95fb7e3be16a95288dec4c66b9511599d034f1af Mon Sep 17 00:00:00 2001
From: ZedB0T <89345505+Zedb0T@users.noreply.github.com>
Date: Sat, 18 May 2024 11:57:07 -0400
Subject: [PATCH] Add files (#83)

---
 hfrag/hfrag.frag         | 23 +++++++++++++++++
 hfrag/hfrag.vert         | 56 ++++++++++++++++++++++++++++++++++++++++
 hfrag/hfrag_montage.frag |  8 ++++++
 hfrag/hfrag_montage.vert | 11 ++++++++
 4 files changed, 98 insertions(+)
 create mode 100644 hfrag/hfrag.frag
 create mode 100644 hfrag/hfrag.vert
 create mode 100644 hfrag/hfrag_montage.frag
 create mode 100644 hfrag/hfrag_montage.vert

diff --git a/hfrag/hfrag.frag b/hfrag/hfrag.frag
new file mode 100644
index 0000000000..fc6bdbce57
--- /dev/null
+++ b/hfrag/hfrag.frag
@@ -0,0 +1,23 @@
+#version 410 core
+
+out vec4 color;
+
+in vec4 fragment_color;
+in vec2 tex_coord;
+in float fogginess;
+uniform sampler2D tex_T0;
+uniform vec4 fog_color;
+
+uniform int gfx_hack_no_tex;
+
+
+void main() {
+  if (gfx_hack_no_tex == 0) {
+    vec4 T0 = texture(tex_T0, tex_coord);
+    color = fragment_color * T0 * 2;
+  } else {
+    color = fragment_color;
+  }
+
+   color.rgb = mix(color.rgb, fog_color.rgb, clamp(fogginess * fog_color.a, 0, 1));
+}
diff --git a/hfrag/hfrag.vert b/hfrag/hfrag.vert
new file mode 100644
index 0000000000..be46fe4e53
--- /dev/null
+++ b/hfrag/hfrag.vert
@@ -0,0 +1,56 @@
+#version 410 core
+
+layout (location = 0) in float position_in;
+layout (location = 1) in int time_of_day_index;
+layout (location = 2) in ivec2 uv;
+layout (location = 3) in int vi;
+
+uniform vec4 hvdf_offset;
+uniform mat4 camera;
+uniform float fog_constant;
+uniform float fog_min;
+uniform float fog_max;
+uniform sampler1D tex_T10; // note, sampled in the vertex shader on purpose.
+// uniform int decal;
+uniform float fog_hack_threshold;
+
+out vec4 fragment_color;
+out vec2 tex_coord;
+out float fogginess;
+
+void main() {
+  int vx = vi % 512;
+  int vz = vi / 512;
+
+  tex_coord.x = (uv.x == 1) ? 1.f : 0.f;
+  tex_coord.y = (uv.y == 1) ? 1.f : 0.f;
+
+  vec4 transformed = -camera[3];
+  transformed -= camera[0] * 32768.f * vx;
+  transformed -= camera[1] * position_in;
+  transformed -= camera[2] * 32768.f * vz;
+
+  float Q = fog_constant / transformed.w;
+
+   fogginess = 255 - clamp(-transformed.w + hvdf_offset.w, fog_min, fog_max);
+
+  transformed.xyz *= Q;
+  // offset
+  transformed.xyz += hvdf_offset.xyz;
+  // correct xy offset
+  transformed.xy -= (2048.);
+  // correct z scale
+  transformed.z /= (8388608);
+  transformed.z -= 1;
+  // correct xy scale
+  transformed.x /= (256);
+  transformed.y /= -(128);
+  transformed.xyz *= transformed.w;
+  // scissoring area adjust
+  transformed.y *= SCISSOR_ADJUST * HEIGHT_SCALE;
+  gl_Position = transformed;
+
+  // time of day lookup
+  fragment_color = texelFetch(tex_T10, time_of_day_index, 0);
+  fragment_color.a = 1.0;
+}
diff --git a/hfrag/hfrag_montage.frag b/hfrag/hfrag_montage.frag
new file mode 100644
index 0000000000..900522a409
--- /dev/null
+++ b/hfrag/hfrag_montage.frag
@@ -0,0 +1,8 @@
+#version 410 core
+out vec4 color;
+in vec2 uv;
+uniform sampler2D tex_T0;
+void main() {
+  color = texture(tex_T0, uv);
+  color.a = 1;
+}
\ No newline at end of file
diff --git a/hfrag/hfrag_montage.vert b/hfrag/hfrag_montage.vert
new file mode 100644
index 0000000000..a1b4b43166
--- /dev/null
+++ b/hfrag/hfrag_montage.vert
@@ -0,0 +1,11 @@
+#version 410 core
+
+layout (location = 0) in vec2 pos;
+layout (location = 1) in vec2 tex_coord;
+
+out vec2 uv;
+
+void main() {
+  gl_Position = vec4(pos.x * 2 - 1, pos.y * 2 - 1, 0, 1);
+  uv = tex_coord;
+}