initial commit

res/shaders/main.glslf

@@ -1,19 +1,53 @@
+layout (location = 0) out vec4 f_color;
+layout (location = 1) out vec4 f_position;
+layout (location = 2) out vec4 f_normal;
+
 in vec4 a_color;
 in vec2 a_texCoord;
 in float a_fog;
+in vec3 a_position;
 in vec3 a_dir;
-out vec4 f_color;
+in vec3 a_normal;
+in vec3 a_realnormal;
+in vec4 a_modelpos;
 
 uniform sampler2D u_texture0;
 uniform samplerCube u_cubemap;
+uniform sampler2DShadow u_shadows;
+
+// flags
 uniform bool u_alphaClip;
 uniform bool u_debugLights;
+uniform bool u_debugNormals;
+uniform bool u_enableShadows;
+
+uniform mat4 u_shadowsMatrix;
+
+const int BLUR_SAMPLES = 6;
 
 void main() {
+    float shadow = 1.0;
+    if (u_enableShadows) {
+        vec4 mpos = u_shadowsMatrix * vec4(a_modelpos.xyz, 1.0);
+        vec3 projCoords = mpos.xyz / mpos.w;
+        projCoords = projCoords * 0.5 + 0.5;
+        projCoords.z -= 0.0001;
+
+        shadow = 0.0;
+        
+        for (int i = 0; i < BLUR_SAMPLES; i++) {
+            shadow += texture(u_shadows, projCoords.xyz + vec3(
+                -0.002*(i%2==0?1:0)*i/BLUR_SAMPLES,
+                -0.002*(i%2==0?0:1)*i/BLUR_SAMPLES,
+                -0.0005 * i/BLUR_SAMPLES));
+        }
+        shadow /= BLUR_SAMPLES;
+        shadow += 0.5;
+        shadow = shadow * 0.7 + 0.3;
+    }
+
     vec3 fogColor = texture(u_cubemap, a_dir).rgb;
     vec4 tex_color = texture(u_texture0, a_texCoord);
-    if (u_debugLights)
-        tex_color.rgb = vec3(1.0);
     float alpha = a_color.a * tex_color.a;
     if (u_alphaClip) {
         if (alpha < 0.2f)
@@ -23,6 +57,14 @@ void main() {
         if (alpha < 0.002f)
             discard;
     }
+    if (u_debugLights)
+        tex_color.rgb = u_debugNormals ? (a_normal * 0.5 + 0.5) : vec3(1.0);
+    else if (u_debugNormals) {
+        tex_color.rgb *= a_normal * 0.5 + 0.5;
+    }
     f_color = mix(a_color * tex_color, vec4(fogColor,1.0), a_fog);
+    f_color.rgb *= shadow;
     f_color.a = alpha;
+    f_position = vec4(a_position, 1.0);
+    f_normal = vec4(a_normal, 1.0);
 }