Added shadow maps

resources/shaders/default_shadow.vertex

@@ -0,0 +1,19 @@
+attribute vec3 vPosition;
+attribute vec2 vTexCoord;
+attribute vec3 vNormal;
+
+varying vec2 texCoord;
+varying vec4 fragPosLightSpace;
+varying vec3 fragNormal;
+
+uniform mat4 ProjectionModelViewMatrix;
+uniform mat4 ModelViewMatrix;
+uniform mat4 uLightFromCamera;
+
+void main()
+{
+	gl_Position = ProjectionModelViewMatrix * vec4(vPosition, 1.0);
+	texCoord = vTexCoord;
+	fragPosLightSpace = uLightFromCamera * ModelViewMatrix * vec4(vPosition, 1.0);
+	fragNormal = mat3(ModelViewMatrix) * vNormal;
+}

resources/shaders/default_shadow_desktop.fragment

@@ -0,0 +1,70 @@
+uniform sampler2D Texture;
+uniform sampler2D uShadowMap;
+uniform vec3 uLightDir;
+
+varying vec2 texCoord;
+varying vec4 fragPosLightSpace;
+varying vec3 fragNormal;
+
+float computeShadow(vec4 lightSpacePos, vec3 normal)
+{
+	vec3 projCoords = lightSpacePos.xyz / lightSpacePos.w;
+	projCoords = projCoords * 0.5 + 0.5;
+
+	if (projCoords.x < 0.0 || projCoords.x > 1.0 ||
+		projCoords.y < 0.0 || projCoords.y > 1.0 ||
+		projCoords.z > 1.0)
+	{
+		return 0.0;
+	}
+
+	float currentDepth = projCoords.z;
+
+	// Slope-dependent bias: large for grazing angles, tiny for surfaces facing the light
+	float bias = 0.0004;
+	if (dot(normal, normal) > 0.001)
+	{
+		float cosTheta = dot(normalize(normal), -normalize(uLightDir));
+		bias = max(0.002 * (1.0 - cosTheta), 0.0002);
+	}
+
+	// 3x3 PCF (percentage-closer filtering) for softer shadows
+	float shadow = 0.0;
+	float texelSize = 1.0 / 2048.0;
+	for (int x = -1; x <= 1; x++)
+	{
+		for (int y = -1; y <= 1; y++)
+		{
+			float pcfDepth = texture2D(uShadowMap, projCoords.xy + vec2(float(x), float(y)) * texelSize).r;
+			shadow += currentDepth - bias > pcfDepth ? 1.0 : 0.0;
+		}
+	}
+	shadow /= 9.0;
+
+	return shadow;
+}
+
+void main()
+{
+	vec4 color = texture2D(Texture, texCoord);
+
+	float ambient = 0.4;
+	float diffuseStrength = 0.6;
+
+	// Compute diffuse term; if normals are missing (zero-length) treat as fully lit
+	float diffuse = 1.0;
+	vec3 n = fragNormal;
+	if (dot(n, n) > 0.001)
+	{
+		n = normalize(n);
+		diffuse = max(dot(n, -normalize(uLightDir)), 0.0);
+	}
+
+	float shadow = computeShadow(fragPosLightSpace, fragNormal);
+
+	// Shadow dims only the diffuse contribution; ambient is always present
+	float lighting = ambient + diffuseStrength * diffuse * (1.0 - shadow);
+	color.rgb *= lighting;
+
+	gl_FragColor = color;
+}

resources/shaders/default_shadow_web.fragment

@@ -0,0 +1,68 @@
+precision mediump float;
+
+uniform sampler2D Texture;
+uniform sampler2D uShadowMap;
+uniform vec3 uLightDir;
+
+varying vec2 texCoord;
+varying vec4 fragPosLightSpace;
+varying vec3 fragNormal;
+
+float computeShadow(vec4 lightSpacePos, vec3 normal)
+{
+	vec3 projCoords = lightSpacePos.xyz / lightSpacePos.w;
+	projCoords = projCoords * 0.5 + 0.5;
+
+	if (projCoords.x < 0.0 || projCoords.x > 1.0 ||
+		projCoords.y < 0.0 || projCoords.y > 1.0 ||
+		projCoords.z > 1.0)
+	{
+		return 0.0;
+	}
+
+	float currentDepth = projCoords.z;
+
+	float bias = 0.0004;
+	if (dot(normal, normal) > 0.001)
+	{
+		float cosTheta = dot(normalize(normal), -normalize(uLightDir));
+		bias = max(0.002 * (1.0 - cosTheta), 0.0002);
+	}
+
+	float shadow = 0.0;
+	float texelSize = 1.0 / 2048.0;
+	for (int x = -1; x <= 1; x++)
+	{
+		for (int y = -1; y <= 1; y++)
+		{
+			float pcfDepth = texture2D(uShadowMap, projCoords.xy + vec2(float(x), float(y)) * texelSize).r;
+			shadow += currentDepth - bias > pcfDepth ? 1.0 : 0.0;
+		}
+	}
+	shadow /= 9.0;
+
+	return shadow;
+}
+
+void main()
+{
+	vec4 color = texture2D(Texture, texCoord);
+
+	float ambient = 0.4;
+	float diffuseStrength = 0.6;
+
+	float diffuse = 1.0;
+	vec3 n = fragNormal;
+	if (dot(n, n) > 0.001)
+	{
+		n = normalize(n);
+		diffuse = max(dot(n, -normalize(uLightDir)), 0.0);
+	}
+
+	float shadow = computeShadow(fragPosLightSpace, fragNormal);
+
+	float lighting = ambient + diffuseStrength * diffuse * (1.0 - shadow);
+	color.rgb *= lighting;
+
+	gl_FragColor = color;
+}

resources/shaders/shadow_depth.vertex

@@ -0,0 +1,9 @@
+attribute vec3 vPosition;
+attribute vec2 vTexCoord;
+
+uniform mat4 ProjectionModelViewMatrix;
+
+void main()
+{
+	gl_Position = ProjectionModelViewMatrix * vec4(vPosition, 1.0);
+}

resources/shaders/shadow_depth_desktop.fragment

@@ -0,0 +1,5 @@
+void main()
+{
+	// Depth is written automatically by the GPU.
+	// Nothing to do here.
+}

resources/shaders/shadow_depth_skinning.vertex

@@ -0,0 +1,47 @@
+attribute vec3 vPosition;
+attribute vec2 vTexCoord;
+attribute vec4 aBoneIndices0;
+attribute vec2 aBoneIndices1;
+attribute vec4 aBoneWeights0;
+attribute vec2 aBoneWeights1;
+
+uniform mat4 ProjectionModelViewMatrix;
+uniform mat4 uBoneMatrices[64];
+
+void main()
+{
+	vec4 skinnedPos = vec4(0.0, 0.0, 0.0, 0.0);
+	vec4 originalPos = vec4(vPosition, 1.0);
+	float totalWeight = 0.0;
+
+	if (aBoneWeights0.x > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices0.x)] * originalPos * aBoneWeights0.x;
+		totalWeight += aBoneWeights0.x;
+	}
+	if (aBoneWeights0.y > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices0.y)] * originalPos * aBoneWeights0.y;
+		totalWeight += aBoneWeights0.y;
+	}
+	if (aBoneWeights0.z > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices0.z)] * originalPos * aBoneWeights0.z;
+		totalWeight += aBoneWeights0.z;
+	}
+	if (aBoneWeights0.w > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices0.w)] * originalPos * aBoneWeights0.w;
+		totalWeight += aBoneWeights0.w;
+	}
+	if (aBoneWeights1.x > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices1.x)] * originalPos * aBoneWeights1.x;
+		totalWeight += aBoneWeights1.x;
+	}
+	if (aBoneWeights1.y > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices1.y)] * originalPos * aBoneWeights1.y;
+		totalWeight += aBoneWeights1.y;
+	}
+
+	if (totalWeight < 0.001) {
+		skinnedPos = originalPos;
+	}
+
+	gl_Position = ProjectionModelViewMatrix * skinnedPos;
+}

resources/shaders/shadow_depth_web.fragment

@@ -0,0 +1,6 @@
+precision mediump float;
+
+void main()
+{
+	// Depth is written automatically by the GPU.
+}

resources/shaders/skinning_shadow.vertex

@@ -0,0 +1,65 @@
+attribute vec3 vPosition;
+attribute vec2 vTexCoord;
+attribute vec3 vNormal;
+attribute vec4 aBoneIndices0;
+attribute vec2 aBoneIndices1;
+attribute vec4 aBoneWeights0;
+attribute vec2 aBoneWeights1;
+
+varying vec2 texCoord;
+varying vec4 fragPosLightSpace;
+varying vec3 fragNormal;
+
+uniform mat4 ProjectionModelViewMatrix;
+uniform mat4 ModelViewMatrix;
+uniform mat4 uLightFromCamera;
+uniform mat4 uBoneMatrices[64];
+
+void main()
+{
+	vec4 skinnedPos = vec4(0.0, 0.0, 0.0, 0.0);
+	vec3 skinnedNormal = vec3(0.0, 0.0, 0.0);
+	vec4 originalPos = vec4(vPosition, 1.0);
+	float totalWeight = 0.0;
+
+	if (aBoneWeights0.x > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices0.x)] * originalPos * aBoneWeights0.x;
+		skinnedNormal += mat3(uBoneMatrices[int(aBoneIndices0.x)]) * vNormal * aBoneWeights0.x;
+		totalWeight += aBoneWeights0.x;
+	}
+	if (aBoneWeights0.y > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices0.y)] * originalPos * aBoneWeights0.y;
+		skinnedNormal += mat3(uBoneMatrices[int(aBoneIndices0.y)]) * vNormal * aBoneWeights0.y;
+		totalWeight += aBoneWeights0.y;
+	}
+	if (aBoneWeights0.z > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices0.z)] * originalPos * aBoneWeights0.z;
+		skinnedNormal += mat3(uBoneMatrices[int(aBoneIndices0.z)]) * vNormal * aBoneWeights0.z;
+		totalWeight += aBoneWeights0.z;
+	}
+	if (aBoneWeights0.w > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices0.w)] * originalPos * aBoneWeights0.w;
+		skinnedNormal += mat3(uBoneMatrices[int(aBoneIndices0.w)]) * vNormal * aBoneWeights0.w;
+		totalWeight += aBoneWeights0.w;
+	}
+	if (aBoneWeights1.x > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices1.x)] * originalPos * aBoneWeights1.x;
+		skinnedNormal += mat3(uBoneMatrices[int(aBoneIndices1.x)]) * vNormal * aBoneWeights1.x;
+		totalWeight += aBoneWeights1.x;
+	}
+	if (aBoneWeights1.y > 0.0) {
+		skinnedPos += uBoneMatrices[int(aBoneIndices1.y)] * originalPos * aBoneWeights1.y;
+		skinnedNormal += mat3(uBoneMatrices[int(aBoneIndices1.y)]) * vNormal * aBoneWeights1.y;
+		totalWeight += aBoneWeights1.y;
+	}
+
+	if (totalWeight < 0.001) {
+		skinnedPos = originalPos;
+		skinnedNormal = vNormal;
+	}
+
+	gl_Position = ProjectionModelViewMatrix * skinnedPos;
+	texCoord = vTexCoord;
+	fragPosLightSpace = uLightFromCamera * ModelViewMatrix * skinnedPos;
+	fragNormal = mat3(ModelViewMatrix) * skinnedNormal;
+}