Add fog example

examples/shaders/fog.py

@@ -0,0 +1,94 @@
+"""
+Example converted to Python from:
+http://bedroomcoders.co.uk/raylib-fog/
+"""
+
+from raylib.dynamic import raylib as rl, ffi
+from raylib.colors import *
+
+rl.SetConfigFlags(rl.FLAG_MSAA_4X_HINT | rl.FLAG_WINDOW_RESIZABLE)
+rl.InitWindow(1280, 768, b'Fog Test')
+
+camera = ffi.new('struct Camera3D *', [
+	[2, 2, 6],
+	[0, 5, 0],
+	[0, 1, 0],
+	45,
+	rl.CAMERA_PERSPECTIVE
+])
+
+model = rl.LoadModelFromMesh(rl.GenMeshTorus(0.4, 1, 16, 32))
+model2 = rl.LoadModelFromMesh(rl.GenMeshCube(1, 1, 1))
+model3 = rl.LoadModelFromMesh(rl.GenMeshSphere(0.5, 32, 32))
+
+texture = rl.LoadTexture(b'resources/test.png')
+
+model.materials[0].maps[rl.MAP_DIFFUSE].texture = texture
+model2.materials[0].maps[rl.MAP_DIFFUSE].texture = texture
+model3.materials[0].maps[rl.MAP_DIFFUSE].texture = texture
+
+shader = rl.LoadShader(b'resources/shaders/fogLight.vs', b'resources/shaders/fogLight.fs')
+shader.locs[rl.LOC_MATRIX_MODEL] = rl.GetShaderLocation(shader, b'matModel')
+shader.locs[rl.LOC_VECTOR_VIEW] = rl.GetShaderLocation(shader, b'viewPos')
+
+amb = rl.GetShaderLocation(shader, b'ambient')
+rl.SetShaderValue(shader, amb, ffi.new('float[]', [0.2, 0.2, 0.2, 1.0]), rl.UNIFORM_VEC4)
+
+fog_color = [0.2, 0.2, 1.0, 1.0]
+fogC = rl.GetShaderLocation(shader, b'fogColor')
+rl.SetShaderValue(shader, fogC, ffi.new('float[]', fog_color), rl.UNIFORM_VEC4)
+
+fogD = rl.GetShaderLocation(shader, b'FogDensity')
+fogDensity = 0.12
+rl.SetShaderValue(shader, fogD, ffi.new('float[]', [fogDensity]), rl.UNIFORM_FLOAT)
+
+
+model.materials[0].shader = shader
+model2.materials[0].shader = shader
+model3.materials[0].shader = shader
+
+rl.SetCameraMode(camera[0], rl.CAMERA_ORBITAL)
+rl.SetTargetFPS(60)
+
+while not rl.WindowShouldClose():
+	rl.UpdateCamera(camera)
+
+	if rl.IsKeyDown(rl.KEY_UP):
+		fogDensity = min(fogDensity + 0.001, 1)
+
+	if rl.IsKeyDown(rl.KEY_DOWN):
+		fogDensity = max(fogDensity - 0.001, 0)
+
+	rl.SetShaderValue(shader, fogD, ffi.new('float[]', [fogDensity]), rl.UNIFORM_FLOAT)
+
+	rl.SetShaderValue(shader, shader.locs[rl.LOC_VECTOR_VIEW], ffi.new('float[]', [camera.position.x]), rl.UNIFORM_VEC3)
+
+	rl.BeginDrawing()
+
+	rl.ClearBackground([int(255 * i) for i in fog_color])
+
+	rl.BeginMode3D(camera[0])
+	rl.DrawModel(model, [0] * 3, 1, WHITE)
+	rl.DrawModel(model2, [-2.6, 0, 0], 1, WHITE)
+	rl.DrawModel(model3, [ 2.6, 0, 0], 1, WHITE)
+
+	for i in range(-20, 20, 2):
+		rl.DrawModel(model, [i, 0, 2], 1, WHITE)
+
+
+	rl.DrawGizmo([1000, 1000, 1000])
+
+	rl.EndMode3D()
+
+	rl.DrawFPS(10, 10)
+	rl.DrawText(f'Up/Down to change fog density: {fogDensity}'.encode('utf-8'), 10, 30, 20, WHITE)
+
+	rl.EndDrawing()
+
+
+rl.CloseWindow()
+rl.UnloadModel(model)
+rl.UnloadModel(model2)
+rl.UnloadModel(model3)
+rl.UnloadTexture(texture)
+rl.UnloadShader(shader)

examples/shaders/resources/shaders/fogLight.fs

@@ -0,0 +1,91 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+in vec4 fragColor;
+in vec3 fragPosition;
+in vec3 fragNormal;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+
+// Output fragment color
+out vec4 finalColor;
+
+// NOTE: Add here your custom variables
+
+#define     MAX_LIGHTS              4
+#define     LIGHT_DIRECTIONAL       0
+#define     LIGHT_POINT             1
+
+struct MaterialProperty {
+    vec3 color;
+    int useSampler;
+    sampler2D sampler;
+};
+
+struct Light {
+    int enabled;
+    int type;
+    vec3 position;
+    vec3 target;
+    vec4 color;
+};
+
+// Input lighting values
+uniform Light lights[MAX_LIGHTS];
+uniform vec4 ambient;
+uniform vec3 viewPos;
+uniform float FogDensity;
+uniform vec4 fogColor;
+
+void main()
+{
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture(texture0, fragTexCoord);
+    vec3 lightDot = vec3(0.0);
+    vec3 normal = normalize(fragNormal);
+    vec3 viewD = normalize(viewPos - fragPosition);
+    vec3 specular = vec3(0.0);
+
+    // NOTE: Implement here your fragment shader code
+
+    for (int i = 0; i < MAX_LIGHTS; i++)
+    {
+        if (lights[i].enabled == 1)
+        {
+            vec3 light = vec3(0.0);
+            if (lights[i].type == LIGHT_DIRECTIONAL) {
+                light = -normalize(lights[i].target - lights[i].position);
+            }
+            if (lights[i].type == LIGHT_POINT) {
+                light = normalize(lights[i].position - fragPosition);
+            }
+            float NdotL = max(dot(normal, light), 0.0);
+            lightDot += lights[i].color.rgb * NdotL;
+
+            float specCo = 0.0;
+            if(NdotL > 0.0)
+                specCo = pow(max(0.0, dot(viewD, reflect(-(light), normal))), 16);//16 =shine
+            specular += specCo;
+
+        }
+    }
+
+    finalColor =  (texelColor * ((colDiffuse+vec4(specular,1)) * vec4(lightDot, 1.0)));
+    finalColor += texelColor * (ambient/10.0);
+    // gamma
+    finalColor = pow(finalColor, vec4(1.0/2.2));
+
+    float dist = length(viewPos - fragPosition) ;
+    float fogFactor = 1.0 / exp( (dist * FogDensity) * (dist * FogDensity));
+
+    // linear less nice
+    //const float fogStart = 2.0;
+    //const float fogEnd = 10.0;
+    //float fogFactor = (fogEnd - dist)/(fogEnd - fogStart);
+
+    fogFactor = clamp( fogFactor, 0.0, 1.0 );
+    finalColor = mix(fogColor, finalColor, fogFactor);
+}

examples/shaders/resources/shaders/fogLight.vs

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+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexColor;
+
+// Input uniform values
+uniform mat4 mvp;
+uniform mat4 matModel;
+
+// Output vertex attributes (to fragment shader)
+out vec2 fragTexCoord;
+out vec4 fragColor;
+out vec3 fragPosition;
+out vec3 fragNormal;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    // Send vertex attributes to fragment shader
+    fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
+    fragPosition = vec3(matModel*vec4(vertexPosition, 1.0f));
+    mat3 normalMatrix = transpose(inverse(mat3(matModel)));
+    fragNormal = normalize(normalMatrix*vertexNormal);
+
+    // Calculate final vertex position
+    gl_Position = mvp*vec4(vertexPosition, 1.0);
+}