Merge pull request #108636 from clayjohn/MSAA-depth-mobile

Add depth resolve to the mobile renderer

servers/rendering/renderer_rd/shaders/effects/resolve_raster.glsl

@@ -0,0 +1,46 @@
+/* clang-format off */
+#[vertex]
+
+#version 450
+
+#VERSION_DEFINES
+
+layout(location = 0) out vec2 uv_interp;
+/* clang-format on */
+
+void main() {
+	vec2 base_arr[3] = vec2[](vec2(-1.0, -1.0), vec2(-1.0, 3.0), vec2(3.0, -1.0));
+	gl_Position = vec4(base_arr[gl_VertexIndex], 0.0, 1.0);
+	uv_interp = clamp(gl_Position.xy, vec2(0.0, 0.0), vec2(1.0, 1.0)) * 2.0; // saturate(x) * 2.0
+}
+
+/* clang-format off */
+#[fragment]
+
+#version 450
+
+#VERSION_DEFINES
+
+layout(location = 0) in vec2 uv_interp;
+
+layout(set = 0, binding = 0) uniform sampler2DMS source_depth;
+
+layout(push_constant, std430) uniform Params {
+    ivec2 pad;
+	int sample_count;
+    int pad2;
+}
+params;
+
+layout (location = 0) out float out_depth;
+
+void main() {
+    ivec2 pos = ivec2(gl_FragCoord.xy);
+
+	float depth_avg = 0.0;
+	for (int i = 0; i < params.sample_count; i++) {
+		depth_avg += texelFetch(source_depth, pos, i).r;
+	}
+	depth_avg /= float(params.sample_count);
+	out_depth = depth_avg;
+}