feat(render): implement Campaign AR and terrain fidelity

src/AcDream.App/Rendering/Shaders/directional_shadow_world_opaque.vert

@@ -0,0 +1,21 @@
+#version 460 core
+#extension GL_ARB_shader_draw_parameters : require
+
+#include "directional_shadow_common.glsl"
+
+layout(location = 0) in vec3 aPosition;
+layout(location = 1) in vec3 aNormal;
+layout(location = 2) in vec2 aTexCoord;
+
+struct InstanceData { mat4 transform; };
+layout(std430, binding = 0) readonly buffer InstanceBuffer {
+    InstanceData Instances[];
+};
+
+uniform int uRenderPass;
+
+void main() {
+    int instanceIndex = gl_BaseInstanceARB + gl_InstanceID;
+    vec4 worldPosition = Instances[instanceIndex].transform * vec4(aPosition, 1.0);
+    gl_Position = uShadowWorldToClip[uRenderPass] * worldPosition;
+}