[rs] Mipmapping example

.gitignore

@@ -8,3 +8,6 @@ Cargo.lock
 
 # These are backup files generated by rustfmt
 **/*.rs.bk
+
+# Other
+.DS_Store

wgpu/Cargo.toml

@@ -24,7 +24,7 @@ gl = ["wgn/gfx-backend-gl"]
 
 [dependencies]
 #TODO: only depend on the published version
-wgn = { package = "wgpu-native", features = ["local", "window-winit"], git = "https://github.com/gfx-rs/wgpu", rev = "8cc50253c428fb0a9aab3c74639a866465d65272" }
+wgn = { package = "wgpu-native", version = "0.2.6", features = ["local", "window-winit"], git = "https://github.com/gfx-rs/wgpu", rev = "a667d50d01c3df03b8540c523278e111da7fc82a" }
 arrayvec = "0.4"
 
 [dev-dependencies]

wgpu/examples/mipmap/blit.frag

@@ -0,0 +1,10 @@
+#version 450
+
+layout(location = 0) in vec2 v_TexCoord;
+layout(location = 0) out vec4 o_Target;
+layout(set = 0, binding = 0) uniform texture2D t_Color;
+layout(set = 0, binding = 1) uniform sampler s_Color;
+
+void main() {
+    o_Target = textureLod(sampler2D(t_Color, s_Color), v_TexCoord, 0.0);
+}

wgpu/examples/mipmap/blit.vert

@@ -0,0 +1,15 @@
+#version 450
+
+layout(location = 0) out vec2 v_TexCoord;
+
+void main() {
+    vec2 tc = vec2(0.0);
+    switch(gl_VertexIndex) {
+        case 0: tc = vec2(1.0, 0.0); break;
+        case 1: tc = vec2(1.0, 1.0); break;
+        case 2: tc = vec2(0.0, 0.0); break;
+        case 3: tc = vec2(0.0, 1.0); break;
+    }
+    v_TexCoord = tc;
+    gl_Position = vec4(tc * 2.0 - 1.0, 0.5, 1.0);
+}

wgpu/examples/mipmap/draw.frag

@@ -0,0 +1,12 @@
+#version 450
+
+layout(location = 0) in vec2 v_TexCoord;
+layout(location = 0) out vec4 o_Target;
+layout(set = 0, binding = 1) uniform texture2D t_Color;
+layout(set = 0, binding = 2) uniform sampler s_Color;
+
+void main() {
+    vec4 tex = texture(sampler2D(t_Color, s_Color), v_TexCoord);
+    float mag = length(v_TexCoord-vec2(0.5));
+    o_Target = mix(tex, vec4(0.0), mag*mag);
+}

wgpu/examples/mipmap/draw.vert

@@ -0,0 +1,15 @@
+#version 450
+
+layout(location = 0) in vec4 a_Pos;
+layout(location = 0) out vec2 v_TexCoord;
+
+layout(set = 0, binding = 0) uniform Locals {
+    mat4 u_Transform;
+};
+
+void main() {
+    v_TexCoord = a_Pos.xy / 10.0;
+    gl_Position = u_Transform * a_Pos;
+    // convert from -1,1 Z to 0,1
+    gl_Position.z = 0.5 * (gl_Position.z + gl_Position.w);
+}