add clouds shader

res/shaders/clouds.glslv

@@ -0,0 +1,49 @@
+#include <commons>
+
+layout (location = 0) in vec3 v_position;
+layout (location = 1) in vec2 v_texCoord;
+layout (location = 2) in vec4 v_light;
+layout (location = 3) in vec4 v_normal;
+
+#include <world_vertex_header>
+#include <lighting>
+#include <fog>
+#include <sky>
+
+uniform float u_dayTime;
+
+out vec4 a_torchLight;
+
+void main() {
+    a_modelpos = u_model * vec4(v_position, 1.0f);
+    a_modelpos.x += sin(u_timer * 0.05 + a_modelpos.z * 0.002) * 1.5;
+    a_modelpos.z += sin(u_timer * 0.2 + a_modelpos.x * 0.002) * 1.5;
+    a_modelpos.y += sin(u_timer * 0.1 + (a_modelpos.x + a_modelpos.z) * 0.001) * 2.0;
+
+    vec3 pos3d = a_modelpos.xyz - u_cameraPos;
+
+    a_realnormal = v_normal.xyz * 2.0 - 1.0;
+    a_normal = calc_screen_normal(a_realnormal);
+
+    a_torchLight = vec4(calc_torch_light(
+        v_light.rgb, a_realnormal, a_modelpos.xyz, u_torchlightColor, u_gamma
+    ), 1.0);
+    a_texCoord = v_texCoord;
+
+    a_dir = a_modelpos.xyz - u_cameraPos;
+    vec3 skyLightColor = pick_sky_color(u_skybox, u_dayTime);
+    a_skyLight = skyLightColor.rgb*v_light.a;
+
+    mat4 viewmodel = u_view * u_model;
+    a_distance = length(viewmodel * vec4(pos3d, 0.0));
+
+#ifndef ADVANCED_RENDER
+    a_fog = calc_fog(length(viewmodel * vec4(pos3d * FOG_POS_SCALE, 0.0)) / 256.0);
+#endif
+
+    a_emission = v_normal.w;
+
+    vec4 viewmodelpos = u_view * a_modelpos;
+    a_position = viewmodelpos.xyz;
+    gl_Position = u_proj * viewmodelpos;
+}