Add support for OpenGL ES 3.2 in pugl_shader_demo

6 files changed, 23 insertions, 8 deletions

diff --git a/examples/shaders/header_320_es.glsl b/examples/shaders/header_320_es.glsl
new file mode 100644
index 0000000..ce5fe68
--- /dev/null
+++ b/examples/shaders/header_320_es.glsl
@@ -0,0 +1,8 @@
+// Copyright 2020-2023 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: ISC
+
+#version 320 es
+
+#define NOPERSPECTIVE
+#define INTER(qualifiers)
+#define UBO(qualifiers) layout(std140)
diff --git a/examples/shaders/header_330.glsl b/examples/shaders/header_330.glsl
index 1de3301..11bdc53 100644
--- a/examples/shaders/header_330.glsl
+++ b/examples/shaders/header_330.glsl
@@ -1,7 +1,8 @@
-// Copyright 2020 David Robillard <d@drobilla.net>
+// Copyright 2020-2023 David Robillard <d@drobilla.net>
 // SPDX-License-Identifier: ISC
 
 #version 330 core
 
+#define NOPERSPECTIVE
 #define INTER(qualifiers)
 #define UBO(qualifiers) layout(std140)
diff --git a/examples/shaders/header_420.glsl b/examples/shaders/header_420.glsl
index 95fe1a1..cd226c9 100644
--- a/examples/shaders/header_420.glsl
+++ b/examples/shaders/header_420.glsl
@@ -1,7 +1,8 @@
-// Copyright 2020 David Robillard <d@drobilla.net>
+// Copyright 2020-2023 David Robillard <d@drobilla.net>
 // SPDX-License-Identifier: ISC
 
 #version 420 core
 
+#define NOPERSPECTIVE noperspective
 #define INTER(qualifiers) layout(qualifiers)
 #define UBO(qualifiers) layout(std140, qualifiers)
diff --git a/examples/shaders/meson.build b/examples/shaders/meson.build
index 54e9235..479f162 100644
--- a/examples/shaders/meson.build
+++ b/examples/shaders/meson.build
@@ -2,6 +2,7 @@
 # SPDX-License-Identifier: 0BSD OR ISC
 
 shader_files = [
+  'header_320_es.glsl',
   'header_330.glsl',
   'header_420.glsl',
   'rect.frag',
diff --git a/examples/shaders/rect.frag b/examples/shaders/rect.frag
index 9cee53b..17290bd 100644
--- a/examples/shaders/rect.frag
+++ b/examples/shaders/rect.frag
@@ -11,9 +11,11 @@
    specified precisely in pixels to draw sharp lines.  The border width is just
    hardcoded, but could be made a uniform or vertex attribute easily enough. */
 
-INTER(location = 0) noperspective in vec2 f_uv;
-INTER(location = 1) noperspective in vec2 f_size;
-INTER(location = 2) noperspective in vec4 f_fillColor;
+precision mediump float;
+
+INTER(location = 0) NOPERSPECTIVE in vec2 f_uv;
+INTER(location = 1) NOPERSPECTIVE in vec2 f_size;
+INTER(location = 2) NOPERSPECTIVE in vec4 f_fillColor;
 
 layout(location = 0) out vec4 FragColor;
 
diff --git a/examples/shaders/rect.vert b/examples/shaders/rect.vert
index 0fa4dbc..ebdbec5 100644
--- a/examples/shaders/rect.vert
+++ b/examples/shaders/rect.vert
@@ -4,6 +4,8 @@
 /* The vertex shader is trivial, but forwards scaled UV coordinates (in pixels)
    to the fragment shader for drawing the border. */
 
+precision mediump float;
+
 UBO(binding = 0) uniform UniformBufferObject
 {
   mat4 projection;
@@ -15,9 +17,9 @@ layout(location = 1) in vec2 v_origin;
 layout(location = 2) in vec2 v_size;
 layout(location = 3) in vec4 v_fillColor;
 
-INTER(location = 0) noperspective out vec2 f_uv;
-INTER(location = 1) noperspective out vec2 f_size;
-INTER(location = 2) noperspective out vec4 f_fillColor;
+INTER(location = 0) NOPERSPECTIVE out vec2 f_uv;
+INTER(location = 1) NOPERSPECTIVE out vec2 f_size;
+INTER(location = 2) NOPERSPECTIVE out vec4 f_fillColor;
 
 void
 main()