gles2: Split shaders into separate files

src/backend/renderer/gles2/shaders/mod.rs

@@ -0,0 +1,14 @@
+/*
+ * OpenGL Shaders
+ */
+
+// define constants
+pub const XBGR: &str = "XBGR";
+pub const EXTERNAL: &str = "EXTERNAL";
+pub const DEBUG_FLAGS: &str = "DEBUG_FLAGS";
+
+pub const VERTEX_SHADER: &str = include_str!("./texture.vert");
+pub const FRAGMENT_SHADER: &str = include_str!("./texture.frag");
+
+pub const VERTEX_SHADER_SOLID: &str = include_str!("./solid.vert");
+pub const FRAGMENT_SHADER_SOLID: &str = include_str!("./solid.frag");

src/backend/renderer/gles2/shaders/solid.frag

@@ -0,0 +1,8 @@
+#version 100
+
+precision mediump float;
+uniform vec4 color;
+
+void main() {
+    gl_FragColor = color;
+}

src/backend/renderer/gles2/shaders/solid.vert

@@ -0,0 +1,19 @@
+#version 100
+
+uniform mat3 matrix;
+attribute vec2 vert;
+attribute vec4 position;
+
+mat2 scale(vec2 scale_vec){
+    return mat2(
+        scale_vec.x, 0.0,
+        0.0, scale_vec.y
+    );
+}
+
+void main() {
+    vec2 transform_translation = position.xy;
+    vec2 transform_scale = position.zw;
+    vec3 position = vec3(vert * scale(transform_scale) + transform_translation, 1.0);
+    gl_Position = vec4(matrix * position, 1.0);
+}

src/backend/renderer/gles2/shaders/texture.frag

@@ -0,0 +1,35 @@
+#version 100
+#if defined(EXTERNAL)
+#extension GL_OES_EGL_image_external : require
+#endif
+
+precision mediump float;
+#if defined(EXTERNAL)
+uniform samplerExternalOES tex;
+#else
+uniform sampler2D tex;
+#endif
+
+uniform float alpha;
+varying vec2 v_coords;
+
+#if defined(DEBUG_FLAGS)
+uniform float tint;
+#endif
+
+void main() {
+    vec4 color;
+
+#if defined(XBGR)
+    color = vec4(texture2D(tex, v_coords).rgb, 1.0) * alpha;
+#else
+    color = texture2D(tex, v_coords) * alpha;
+#endif
+
+#if defined(DEBUG_FLAGS)
+    if (tint == 1.0)
+        color = vec4(0.0, 0.3, 0.0, 0.2) + color * 0.8;
+#endif
+
+    gl_FragColor = color;
+}

src/backend/renderer/gles2/shaders/texture.vert

@@ -0,0 +1,23 @@
+#version 100
+uniform mat3 matrix;
+uniform mat3 tex_matrix;
+
+attribute vec2 vert;
+attribute vec4 vert_position;
+
+varying vec2 v_coords;
+
+mat2 scale(vec2 scale_vec){
+    return mat2(
+        scale_vec.x, 0.0,
+        0.0, scale_vec.y
+    );
+}
+
+void main() {
+    vec2 vert_transform_translation = vert_position.xy;
+    vec2 vert_transform_scale = vert_position.zw;
+    vec3 position = vec3(vert * scale(vert_transform_scale) + vert_transform_translation, 1.0);
+    v_tex_coords = (tex_matrix * position).xy;
+    gl_Position = vec4(matrix * position, 1.0);
+}