From fa54868eb1bfa567101fc804e92fd7ec8b581f2f Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Fri, 15 Nov 2019 21:17:50 -0800
Subject: [PATCH] Add support for single float uniforms to `pathfinder_gpu`

---
 gl/src/lib.rs    | 3 +++
 gpu/src/lib.rs   | 1 +
 metal/src/lib.rs | 6 ++++++
 3 files changed, 10 insertions(+)

diff --git a/gl/src/lib.rs b/gl/src/lib.rs
index 6e300c55..2bb8de93 100644
--- a/gl/src/lib.rs
+++ b/gl/src/lib.rs
@@ -153,6 +153,9 @@ impl GLDevice {
     fn set_uniform(&self, uniform: &GLUniform, data: &UniformData) {
         unsafe {
             match *data {
+                UniformData::Float(value) => {
+                    gl::Uniform1f(uniform.location, value); ck();
+                }
                 UniformData::Int(value) => {
                     gl::Uniform1i(uniform.location, value); ck();
                 }
diff --git a/gpu/src/lib.rs b/gpu/src/lib.rs
index 5e295c8d..eaaa0dc7 100644
--- a/gpu/src/lib.rs
+++ b/gpu/src/lib.rs
@@ -151,6 +151,7 @@ pub enum ShaderKind {
 
 #[derive(Clone, Copy)]
 pub enum UniformData {
+    Float(f32),
     Int(i32),
     Mat2(F32x4),
     Mat4([F32x4; 4]),
diff --git a/metal/src/lib.rs b/metal/src/lib.rs
index cd9da434..38843869 100644
--- a/metal/src/lib.rs
+++ b/metal/src/lib.rs
@@ -797,6 +797,9 @@ impl MetalDevice {
         for &(_, uniform_data) in render_state.uniforms.iter() {
             let start_index = uniform_buffer_data.len();
             match uniform_data {
+                UniformData::Float(value) => {
+                    uniform_buffer_data.write_f32::<NativeEndian>(value).unwrap()
+                }
                 UniformData::Int(value) => {
                     uniform_buffer_data.write_i32::<NativeEndian>(value).unwrap()
                 }
@@ -1145,6 +1148,9 @@ impl UniformDataExt for UniformData {
         unsafe {
             match *self {
                 UniformData::TextureUnit(_) => None,
+                UniformData::Float(ref data) => {
+                    Some(slice::from_raw_parts(data as *const f32 as *const u8, 4 * 1))
+                }
                 UniformData::Int(ref data) => {
                     Some(slice::from_raw_parts(data as *const i32 as *const u8, 4 * 1))
                 }