From b87a0b2f042536692ddd3e4802f5a896a86aee33 Mon Sep 17 00:00:00 2001
From: griffi-gh <prasol258@gmail.com>
Date: Mon, 25 Mar 2024 15:37:32 +0100
Subject: [PATCH] load shader based on api

---
 hui-glium/shaders/fragment.150.frag           | 13 +++++++++++++
 .../{fragment.frag => fragment.es.frag}       |  0
 hui-glium/shaders/vertex.150.vert             | 17 +++++++++++++++++
 .../shaders/{vertex.vert => vertex.es.vert}   |  0
 hui-glium/src/lib.rs                          | 19 ++++++++++---------
 5 files changed, 40 insertions(+), 9 deletions(-)
 create mode 100644 hui-glium/shaders/fragment.150.frag
 rename hui-glium/shaders/{fragment.frag => fragment.es.frag} (100%)
 create mode 100644 hui-glium/shaders/vertex.150.vert
 rename hui-glium/shaders/{vertex.vert => vertex.es.vert} (100%)

diff --git a/hui-glium/shaders/fragment.150.frag b/hui-glium/shaders/fragment.150.frag
new file mode 100644
index 0000000..d53bea1
--- /dev/null
+++ b/hui-glium/shaders/fragment.150.frag
@@ -0,0 +1,13 @@
+#version 150 core
+
+precision highp float;
+precision highp sampler2D;
+
+out vec4 out_color;
+in vec4 vtx_color;
+in vec2 vtx_uv;
+uniform sampler2D tex;
+
+void main() {
+  out_color = texture(tex, vtx_uv) * vtx_color;
+}
diff --git a/hui-glium/shaders/fragment.frag b/hui-glium/shaders/fragment.es.frag
similarity index 100%
rename from hui-glium/shaders/fragment.frag
rename to hui-glium/shaders/fragment.es.frag
diff --git a/hui-glium/shaders/vertex.150.vert b/hui-glium/shaders/vertex.150.vert
new file mode 100644
index 0000000..874e872
--- /dev/null
+++ b/hui-glium/shaders/vertex.150.vert
@@ -0,0 +1,17 @@
+#version 150 core
+
+precision highp float;
+
+uniform vec2 resolution;
+in vec2 uv;
+in vec4 color;
+in vec2 position;
+out vec4 vtx_color;
+out vec2 vtx_uv;
+
+void main() {
+  vtx_color = color;
+  vtx_uv = uv;
+  vec2 pos2d = (vec2(2., -2.) * (position / resolution)) + vec2(-1, 1);
+  gl_Position = vec4(pos2d, 0., 1.);
+}
diff --git a/hui-glium/shaders/vertex.vert b/hui-glium/shaders/vertex.es.vert
similarity index 100%
rename from hui-glium/shaders/vertex.vert
rename to hui-glium/shaders/vertex.es.vert
diff --git a/hui-glium/src/lib.rs b/hui-glium/src/lib.rs
index 6ce47b1..d75651b 100644
--- a/hui-glium/src/lib.rs
+++ b/hui-glium/src/lib.rs
@@ -1,19 +1,17 @@
 use std::rc::Rc;
 use glam::Vec2;
 use glium::{
-  Blend, DrawParameters, IndexBuffer, Program, Surface, VertexBuffer,
-  implement_vertex, uniform,
-  backend::{Context, Facade},
-  index::PrimitiveType,
-  texture::{RawImage2d, Texture2d},
-  uniforms::{MagnifySamplerFilter, MinifySamplerFilter, Sampler, SamplerBehavior, SamplerWrapFunction},
+  backend::{Context, Facade}, implement_vertex, index::PrimitiveType, texture::{RawImage2d, Texture2d}, uniform, uniforms::{MagnifySamplerFilter, MinifySamplerFilter, Sampler, SamplerBehavior, SamplerWrapFunction}, Api, Blend, DrawParameters, IndexBuffer, Program, Surface, VertexBuffer
 };
 use hui::{
   draw::{TextureAtlasMeta, UiDrawCall, UiVertex}, UiInstance
 };
 
-const VERTEX_SHADER: &str = include_str!("../shaders/vertex.vert");
-const FRAGMENT_SHADER: &str = include_str!("../shaders/fragment.frag");
+const VERTEX_SHADER_GLES3: &str = include_str!("../shaders/vertex.es.vert");
+const FRAGMENT_SHADER_GLES3: &str = include_str!("../shaders/fragment.es.frag");
+
+const VERTEX_SHADER_150: &str = include_str!("../shaders/vertex.150.vert");
+const FRAGMENT_SHADER_150: &str = include_str!("../shaders/fragment.150.frag");
 
 #[derive(Clone, Copy)]
 #[repr(C)]
@@ -122,7 +120,10 @@ impl GliumUiRenderer {
   pub fn new<F: Facade>(facade: &F) -> Self {
     log::info!("initializing hui-glium");
     Self {
-      program: Program::from_source(facade, VERTEX_SHADER, FRAGMENT_SHADER, None).unwrap(),
+      program: match facade.get_context().get_supported_glsl_version().0 {
+        Api::Gl => Program::from_source(facade, VERTEX_SHADER_150, FRAGMENT_SHADER_150, None).unwrap(),
+        Api::GlEs => Program::from_source(facade, VERTEX_SHADER_GLES3, FRAGMENT_SHADER_GLES3, None).unwrap(),
+      },
       context: Rc::clone(facade.get_context()),
       ui_texture: None,
       buffer_pair: None,