Use get_uniform_location for wider compatibility

glow/Cargo.toml

@@ -34,4 +34,4 @@ features = ["font-source", "font-fallback", "font-icons", "opengl"]
 
 [dependencies.glow_glyph]
 git = "https://github.com/hecrj/glow_glyph"
-rev = "f027ffa49962d78ac85e282c635e848bef785ee9"
+rev = "8ec7982d9e0ce828769d4ba7abe73b0b0ec22db6"

glow/src/quad.rs

@@ -11,6 +11,9 @@ pub struct Pipeline {
     program: <glow::Context as HasContext>::Program,
     vertex_array: <glow::Context as HasContext>::VertexArray,
     instances: <glow::Context as HasContext>::Buffer,
+    transform_location: <glow::Context as HasContext>::UniformLocation,
+    scale_location: <glow::Context as HasContext>::UniformLocation,
+    screen_height_location: <glow::Context as HasContext>::UniformLocation,
     current_transform: Transformation,
     current_scale: f32,
     current_target_height: u32,
@@ -28,14 +31,30 @@ impl Pipeline {
             )
         };
 
+        let transform_location =
+            unsafe { gl.get_uniform_location(program, "u_Transform") }
+                .expect("Get transform location");
+
+        let scale_location =
+            unsafe { gl.get_uniform_location(program, "u_Scale") }
+                .expect("Get scale location");
+
+        let screen_height_location =
+            unsafe { gl.get_uniform_location(program, "u_ScreenHeight") }
+                .expect("Get target height location");
+
         unsafe {
             gl.use_program(Some(program));
 
             let matrix: [f32; 16] = Transformation::identity().into();
-            gl.uniform_matrix_4_f32_slice(Some(&0), false, &matrix);
+            gl.uniform_matrix_4_f32_slice(
+                Some(&transform_location),
+                false,
+                &matrix,
+            );
 
-            gl.uniform_1_f32(Some(&1), 1.0);
+            gl.uniform_1_f32(Some(&scale_location), 1.0);
-            gl.uniform_1_f32(Some(&2), 0.0);
+            gl.uniform_1_f32(Some(&screen_height_location), 0.0);
 
             gl.use_program(None);
         }
@@ -47,6 +66,9 @@ impl Pipeline {
             program,
             vertex_array,
             instances,
+            transform_location,
+            scale_location,
+            screen_height_location,
             current_transform: Transformation::identity(),
             current_scale: 1.0,
             current_target_height: 0,
@@ -79,7 +101,11 @@ impl Pipeline {
         if transformation != self.current_transform {
             unsafe {
                 let matrix: [f32; 16] = transformation.into();
-                gl.uniform_matrix_4_f32_slice(Some(&0), false, &matrix);
+                gl.uniform_matrix_4_f32_slice(
+                    Some(&self.transform_location),
+                    false,
+                    &matrix,
+                );
 
                 self.current_transform = transformation;
             }
@@ -87,7 +113,7 @@ impl Pipeline {
 
         if scale != self.current_scale {
             unsafe {
-                gl.uniform_1_f32(Some(&1), scale);
+                gl.uniform_1_f32(Some(&self.scale_location), scale);
             }
 
             self.current_scale = scale;
@@ -95,7 +121,10 @@ impl Pipeline {
 
         if target_height != self.current_target_height {
             unsafe {
-                gl.uniform_1_f32(Some(&2), target_height as f32);
+                gl.uniform_1_f32(
+                    Some(&self.screen_height_location),
+                    target_height as f32,
+                );
             }
 
             self.current_target_height = target_height;

glow/src/shader/quad.frag

@@ -1,15 +1,15 @@
-#version 450
+#version 330
 
-layout(location = 2) uniform float u_Screen_Height;
+uniform float u_ScreenHeight;
 
-layout(location = 0) in vec4 v_Color;
+in vec4 v_Color;
-layout(location = 1) in vec4 v_BorderColor;
+in vec4 v_BorderColor;
-layout(location = 2) in vec2 v_Pos;
+in vec2 v_Pos;
-layout(location = 3) in vec2 v_Scale;
+in vec2 v_Scale;
-layout(location = 4) in float v_BorderRadius;
+in float v_BorderRadius;
-layout(location = 5) in float v_BorderWidth;
+in float v_BorderWidth;
 
-layout(location = 0) out vec4 o_Color;
+out vec4 o_Color;
 
 float distance(in vec2 frag_coord, in vec2 position, in vec2 size, float radius)
 {
@@ -22,8 +22,8 @@ float distance(in vec2 frag_coord, in vec2 position, in vec2 size, float radius)
     vec2 bottom_right_distance = frag_coord - bottom_right;
 
     vec2 distance = vec2(
-        max(max(top_left_distance.x, bottom_right_distance.x), 0),
+        max(max(top_left_distance.x, bottom_right_distance.x), 0.0),
-        max(max(top_left_distance.y, bottom_right_distance.y), 0)
+        max(max(top_left_distance.y, bottom_right_distance.y), 0.0)
     );
 
     return sqrt(distance.x * distance.x + distance.y * distance.y);
@@ -32,11 +32,11 @@ float distance(in vec2 frag_coord, in vec2 position, in vec2 size, float radius)
 void main() {
     vec4 mixed_color;
 
-    vec2 fragCoord = vec2(gl_FragCoord.x, u_Screen_Height - gl_FragCoord.y);
+    vec2 fragCoord = vec2(gl_FragCoord.x, u_ScreenHeight - gl_FragCoord.y);
 
     // TODO: Remove branching (?)
     if(v_BorderWidth > 0) {
-        float internal_border = max(v_BorderRadius - v_BorderWidth, 0);
+        float internal_border = max(v_BorderRadius - v_BorderWidth, 0.0);
 
         float internal_distance = distance(
             fragCoord,
@@ -64,7 +64,7 @@ void main() {
     );
 
     float radius_alpha =
-        1.0 - smoothstep(max(v_BorderRadius - 0.5, 0), v_BorderRadius + 0.5, d);
+        1.0 - smoothstep(max(v_BorderRadius - 0.5, 0.0), v_BorderRadius + 0.5, d);
 
     o_Color = vec4(mixed_color.xyz, mixed_color.w * radius_alpha);
 }

glow/src/shader/quad.vert

@@ -1,7 +1,7 @@
-#version 450
+#version 330
 
-layout(location = 0) uniform mat4 u_Transform;
+uniform mat4 u_Transform;
-layout(location = 1) uniform float u_Scale;
+uniform float u_Scale;
 
 layout(location = 0) in vec2 i_Pos;
 layout(location = 1) in vec2 i_Scale;
@@ -10,12 +10,12 @@ layout(location = 3) in vec4 i_BorderColor;
 layout(location = 4) in float i_BorderRadius;
 layout(location = 5) in float i_BorderWidth;
 
-layout(location = 0) out vec4 o_Color;
+out vec4 v_Color;
-layout(location = 1) out vec4 o_BorderColor;
+out vec4 v_BorderColor;
-layout(location = 2) out vec2 o_Pos;
+out vec2 v_Pos;
-layout(location = 3) out vec2 o_Scale;
+out vec2 v_Scale;
-layout(location = 4) out float o_BorderRadius;
+out float v_BorderRadius;
-layout(location = 5) out float o_BorderWidth;
+out float v_BorderWidth;
 
 const vec2 positions[4] = vec2[](
     vec2(0.0, 0.0),
@@ -25,7 +25,7 @@ const vec2 positions[4] = vec2[](
 );
 
 void main() {
-    vec2 v_Pos = positions[gl_VertexID];
+    vec2 q_Pos = positions[gl_VertexID];
     vec2 p_Pos = i_Pos * u_Scale;
     vec2 p_Scale = i_Scale  * u_Scale;
 
@@ -36,12 +36,12 @@ void main() {
         vec4(p_Pos - vec2(0.5, 0.5), 0.0, 1.0)
     );
 
-    o_Color = i_Color;
+    v_Color = i_Color;
-    o_BorderColor = i_BorderColor;
+    v_BorderColor = i_BorderColor;
-    o_Pos = p_Pos;
+    v_Pos = p_Pos;
-    o_Scale = p_Scale;
+    v_Scale = p_Scale;
-    o_BorderRadius = i_BorderRadius * u_Scale;
+    v_BorderRadius = i_BorderRadius * u_Scale;
-    o_BorderWidth = i_BorderWidth * u_Scale;
+    v_BorderWidth = i_BorderWidth * u_Scale;
 
-    gl_Position = u_Transform * i_Transform * vec4(v_Pos, 0.0, 1.0);
+    gl_Position = u_Transform * i_Transform * vec4(q_Pos, 0.0, 1.0);
 }

glow/src/shader/triangle.frag

@@ -1,8 +1,9 @@
-#version 450
+#version 330
 
-layout(location = 0) in vec4 i_Color;
+in vec4 v_Color;
-layout(location = 0) out vec4 o_Color;
+
+out vec4 o_Color;
 
 void main() {
-    o_Color = i_Color;
+    o_Color = v_Color;
 }

glow/src/shader/triangle.vert

@@ -1,13 +1,13 @@
-#version 450
+#version 330
 
-layout(location = 0) uniform mat4 u_Transform;
+uniform mat4 u_Transform;
 
 layout(location = 0) in vec2 i_Position;
 layout(location = 1) in vec4 i_Color;
 
-layout(location = 0) out vec4 o_Color;
+out vec4 v_Color;
 
 void main() {
     gl_Position = u_Transform * vec4(i_Position, 0.0, 1.0);
-    o_Color = i_Color;
+    v_Color = i_Color;
 }

glow/src/triangle.rs

@@ -18,6 +18,7 @@ pub(crate) struct Pipeline {
     vertex_array: <glow::Context as HasContext>::VertexArray,
     vertices: Buffer<Vertex2D>,
     indices: Buffer<u32>,
+    transform_location: <glow::Context as HasContext>::UniformLocation,
     current_transform: Transformation,
     antialias: Antialias,
 }
@@ -40,11 +41,19 @@ impl Pipeline {
             )
         };
 
+        let transform_location =
+            unsafe { gl.get_uniform_location(program, "u_Transform") }
+                .expect("Get transform location");
+
         unsafe {
             gl.use_program(Some(program));
 
             let transform: [f32; 16] = Transformation::identity().into();
-            gl.uniform_matrix_4_f32_slice(Some(&0), false, &transform);
+            gl.uniform_matrix_4_f32_slice(
+                Some(&transform_location),
+                false,
+                &transform,
+            );
 
             gl.use_program(None);
         }
@@ -98,6 +107,7 @@ impl Pipeline {
             vertex_array,
             vertices,
             indices,
+            transform_location,
             current_transform: Transformation::identity(),
             antialias: Antialias::new(antialiasing),
         }
@@ -163,6 +173,7 @@ impl Pipeline {
         let Self {
             antialias,
             current_transform,
+            transform_location,
             ..
         } = self;
 
@@ -185,7 +196,11 @@ impl Pipeline {
                 unsafe {
                     if *current_transform != transform {
                         let matrix: [f32; 16] = transform.into();
-                        gl.uniform_matrix_4_f32_slice(Some(&0), false, &matrix);
+                        gl.uniform_matrix_4_f32_slice(
+                            Some(transform_location),
+                            false,
+                            &matrix,
+                        );
 
                         *current_transform = transform;
                     }