feat(gst): Added gst a high level wrapper over gstreamer

chore(example): Added hdr-gstreamer-wgpu example
chore(license): Added MIT license to all crates

examples/hdr-gstreamer-wgpu/src/shader.wgsl

@@ -0,0 +1,31 @@
+// Vertex shader
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+    @location(0) tex_coords: vec2<f32>,
+};
+
+@vertex
+fn vs_main(
+    @builtin(vertex_index) in_vertex_index: u32,
+) -> VertexOutput {
+    var out: VertexOutput;
+    let uv = vec2<f32>(f32((in_vertex_index << 1u) & 2u), f32(in_vertex_index & 2u));
+    out.clip_position = vec4<f32>(uv * 2.0 - 1.0, 0.0, 1.0);
+    out.clip_position.y = -out.clip_position.y;
+    out.tex_coords = uv;
+    return out;
+}
+
+// Fragment shader
+
+@group(0) @binding(0)
+var t_diffuse: texture_2d<f32>;
+@group(0) @binding(1)
+var s_diffuse: sampler;
+
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    return textureSample(t_diffuse, s_diffuse, in.tex_coords);
+}
+