Added shadow maps

proj-windows/CMakeLists.txt

@@ -48,6 +48,8 @@ add_executable(space-game001
 #	../src/planet/StoneObject.h
 	../src/render/FrameBuffer.cpp
 	../src/render/FrameBuffer.h
+	../src/render/ShadowMap.cpp
+	../src/render/ShadowMap.h
     ../src/UiManager.cpp
     ../src/UiManager.h
     ../src/Projectile.h
@@ -109,6 +111,7 @@ target_compile_definitions(space-game001 PRIVATE
     WIN32_LEAN_AND_MEAN
     PNG_ENABLED
     SDL_MAIN_HANDLED
+#    DEBUG_LIGHT
 #	NETWORK
 #    SIMPLIFIED
 )

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;
+}

src/Character.cpp

@@ -249,7 +249,11 @@ void Character::draw(Renderer& renderer) {
 }
 
 void Character::prepareGpuSkinningVBOs(AnimationData& anim) {
-    if (anim.gpuSkinningPrepared) return;
+    if (anim.gpuSkinningPrepared)
+    {
+
+        return;
+    }
 
     anim.model.PrepareGpuSkinningData();
 
@@ -284,13 +288,18 @@ void Character::prepareGpuSkinningVBOs(AnimationData& anim) {
 void Character::drawGpuSkinning(Renderer& renderer) {
     AnimationState drawState = resolveActiveState();
     auto it = animations.find(drawState);
-    if (it == animations.end() || !texture) return;
+    if (it == animations.end() || !texture)
+    {
+        return;
+    }
 
     auto& anim = it->second;
     prepareGpuSkinningVBOs(anim);
 
-    if (anim.skinningMatrices.empty()) return;
-
+    if (anim.skinningMatrices.empty())
+    {
+        return;
+    }
     static const std::string skinningShaderName = "skinning";
     static const std::string boneMatricesUniform = "uBoneMatrices[0]";
 
@@ -354,4 +363,217 @@ void Character::drawGpuSkinning(Renderer& renderer) {
     renderer.shaderManager.PopShader();
 }
 
+// ==================== Shadow depth pass ====================
+
+void Character::drawShadowDepth(Renderer& renderer) {
+    if (useGpuSkinning) {
+        drawShadowDepthGpuSkinning(renderer);
+    } else {
+        drawShadowDepthCpu(renderer);
+    }
+}
+
+void Character::drawShadowDepthCpu(Renderer& renderer) {
+    AnimationState drawState = resolveActiveState();
+    auto it = animations.find(drawState);
+    if (it == animations.end()) return;
+
+    // The caller has already pushed the shadow_depth shader and the
+    // light's projection + view onto the renderer stacks.
+    renderer.PushMatrix();
+    renderer.TranslateMatrix({ position.x(), position.y(), position.z() });
+    renderer.RotateMatrix(Eigen::Quaternionf(Eigen::AngleAxisf(-facingAngle, Eigen::Vector3f::UnitY())).toRotationMatrix());
+    renderer.ScaleMatrix(modelScale);
+    renderer.RotateMatrix(modelCorrectionRotation.toRotationMatrix());
+
+    auto& anim = it->second;
+    anim.modelMutable.AssignFrom(anim.model.mesh);
+    anim.modelMutable.RefreshVBO();
+    renderer.DrawVertexRenderStruct(anim.modelMutable);
+
+    renderer.PopMatrix();
+}
+
+void Character::drawShadowDepthGpuSkinning(Renderer& renderer) {
+    AnimationState drawState = resolveActiveState();
+    auto it = animations.find(drawState);
+    if (it == animations.end()) return;
+
+    auto& anim = it->second;
+    prepareGpuSkinningVBOs(anim);
+    if (anim.skinningMatrices.empty()) return;
+
+    static const std::string shadowSkinningShader = "shadow_depth_skinning";
+    static const std::string boneMatricesUniform = "uBoneMatrices[0]";
+
+    // Switch to the skinning depth shader (caller has the static depth shader active).
+    renderer.shaderManager.PushShader(shadowSkinningShader);
+
+    renderer.PushMatrix();
+    renderer.TranslateMatrix({ position.x(), position.y(), position.z() });
+    renderer.RotateMatrix(Eigen::Quaternionf(Eigen::AngleAxisf(-facingAngle, Eigen::Vector3f::UnitY())).toRotationMatrix());
+    renderer.ScaleMatrix(modelScale);
+    renderer.RotateMatrix(modelCorrectionRotation.toRotationMatrix());
+
+    renderer.RenderUniformMatrix4fvArray(boneMatricesUniform,
+        static_cast<int>(anim.skinningMatrices.size()), false,
+        anim.skinningMatrices[0].data());
+
+#ifndef EMSCRIPTEN
+#ifndef __ANDROID__
+    if (anim.bindPoseMutable.vao) {
+        glBindVertexArray(anim.bindPoseMutable.vao->getBuffer());
+        renderer.shaderManager.EnableVertexAttribArrays();
+    }
+#endif
+#endif
+
+    glBindBuffer(GL_ARRAY_BUFFER, anim.bindPoseMutable.positionVBO->getBuffer());
+    renderer.VertexAttribPointer3fv("vPosition", 0, NULL);
+
+    if (anim.bindPoseMutable.texCoordVBO) {
+        glBindBuffer(GL_ARRAY_BUFFER, anim.bindPoseMutable.texCoordVBO->getBuffer());
+        renderer.VertexAttribPointer2fv("vTexCoord", 0, NULL);
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, anim.boneIndices0VBO->getBuffer());
+    renderer.VertexAttribPointer4fv("aBoneIndices0", 0, NULL);
+    glBindBuffer(GL_ARRAY_BUFFER, anim.boneIndices1VBO->getBuffer());
+    renderer.VertexAttribPointer2fv("aBoneIndices1", 0, NULL);
+    glBindBuffer(GL_ARRAY_BUFFER, anim.boneWeights0VBO->getBuffer());
+    renderer.VertexAttribPointer4fv("aBoneWeights0", 0, NULL);
+    glBindBuffer(GL_ARRAY_BUFFER, anim.boneWeights1VBO->getBuffer());
+    renderer.VertexAttribPointer2fv("aBoneWeights1", 0, NULL);
+
+    glDrawArrays(GL_TRIANGLES, 0, static_cast<GLsizei>(anim.bindPoseMutable.data.PositionData.size()));
+
+    renderer.PopMatrix();
+    renderer.shaderManager.PopShader();
+}
+
+// ==================== Main pass with shadows ====================
+
+void Character::drawWithShadow(Renderer& renderer, const Eigen::Matrix4f& lightFromCamera, GLuint shadowMapTex, const Eigen::Vector3f& lightDirCamera) {
+    if (useGpuSkinning) {
+        drawGpuSkinningWithShadow(renderer, lightFromCamera, shadowMapTex, lightDirCamera);
+    } else {
+        drawCpuWithShadow(renderer, lightFromCamera, shadowMapTex, lightDirCamera);
+    }
+}
+
+void Character::drawCpuWithShadow(Renderer& renderer, const Eigen::Matrix4f& lightFromCamera, GLuint shadowMapTex, const Eigen::Vector3f& lightDirCamera) {
+    AnimationState drawState = resolveActiveState();
+    auto it = animations.find(drawState);
+    if (it == animations.end() || !texture) return;
+
+    static const std::string shadowShader = "default_shadow";
+
+    renderer.shaderManager.PushShader(shadowShader);
+    renderer.RenderUniform1i(textureUniformName, 0);
+    renderer.RenderUniform1i("uShadowMap", 1);
+    renderer.RenderUniformMatrix4fv("uLightFromCamera", false, lightFromCamera.data());
+    renderer.RenderUniform3fv("uLightDir", lightDirCamera.data());
+
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, shadowMapTex);
+    glActiveTexture(GL_TEXTURE0);
+
+    renderer.PushPerspectiveProjectionMatrix(1.0 / 1.5,
+        static_cast<float>(Environment::width) / static_cast<float>(Environment::height),
+        Environment::CONST_Z_NEAR, Environment::CONST_Z_FAR);
+
+    renderer.PushMatrix();
+    renderer.TranslateMatrix({ position.x(), position.y(), position.z() });
+    renderer.RotateMatrix(Eigen::Quaternionf(Eigen::AngleAxisf(-facingAngle, Eigen::Vector3f::UnitY())).toRotationMatrix());
+    renderer.ScaleMatrix(modelScale);
+    renderer.RotateMatrix(modelCorrectionRotation.toRotationMatrix());
+
+    auto& anim = it->second;
+    anim.modelMutable.AssignFrom(anim.model.mesh);
+    anim.modelMutable.RefreshVBO();
+    glBindTexture(GL_TEXTURE_2D, texture->getTexID());
+    renderer.DrawVertexRenderStruct(anim.modelMutable);
+
+    renderer.PopMatrix();
+    renderer.PopProjectionMatrix();
+    renderer.shaderManager.PopShader();
+}
+
+void Character::drawGpuSkinningWithShadow(Renderer& renderer, const Eigen::Matrix4f& lightFromCamera, GLuint shadowMapTex, const Eigen::Vector3f& lightDirCamera) {
+    AnimationState drawState = resolveActiveState();
+    auto it = animations.find(drawState);
+    if (it == animations.end() || !texture) return;
+
+    auto& anim = it->second;
+    prepareGpuSkinningVBOs(anim);
+    if (anim.skinningMatrices.empty()) return;
+
+    static const std::string skinningShadowShader = "skinning_shadow";
+    static const std::string boneMatricesUniform = "uBoneMatrices[0]";
+
+    renderer.shaderManager.PushShader(skinningShadowShader);
+    renderer.RenderUniform1i(textureUniformName, 0);
+    renderer.RenderUniform1i("uShadowMap", 1);
+    renderer.RenderUniformMatrix4fv("uLightFromCamera", false, lightFromCamera.data());
+    renderer.RenderUniform3fv("uLightDir", lightDirCamera.data());
+
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, shadowMapTex);
+    glActiveTexture(GL_TEXTURE0);
+
+    renderer.PushPerspectiveProjectionMatrix(1.0 / 1.5,
+        static_cast<float>(Environment::width) / static_cast<float>(Environment::height),
+        Environment::CONST_Z_NEAR, Environment::CONST_Z_FAR);
+
+    renderer.PushMatrix();
+    renderer.TranslateMatrix({ position.x(), position.y(), position.z() });
+    renderer.RotateMatrix(Eigen::Quaternionf(Eigen::AngleAxisf(-facingAngle, Eigen::Vector3f::UnitY())).toRotationMatrix());
+    renderer.ScaleMatrix(modelScale);
+    renderer.RotateMatrix(modelCorrectionRotation.toRotationMatrix());
+
+    renderer.RenderUniformMatrix4fvArray(boneMatricesUniform,
+        static_cast<int>(anim.skinningMatrices.size()), false,
+        anim.skinningMatrices[0].data());
+
+    glBindTexture(GL_TEXTURE_2D, texture->getTexID());
+
+#ifndef EMSCRIPTEN
+#ifndef __ANDROID__
+    if (anim.bindPoseMutable.vao) {
+        glBindVertexArray(anim.bindPoseMutable.vao->getBuffer());
+        renderer.shaderManager.EnableVertexAttribArrays();
+    }
+#endif
+#endif
+
+    glBindBuffer(GL_ARRAY_BUFFER, anim.bindPoseMutable.positionVBO->getBuffer());
+    renderer.VertexAttribPointer3fv("vPosition", 0, NULL);
+
+    if (anim.bindPoseMutable.texCoordVBO) {
+        glBindBuffer(GL_ARRAY_BUFFER, anim.bindPoseMutable.texCoordVBO->getBuffer());
+        renderer.VertexAttribPointer2fv("vTexCoord", 0, NULL);
+    }
+
+    // Bind normals for diffuse lighting (skinning_shadow shader skins them)
+    if (anim.bindPoseMutable.normalVBO) {
+        glBindBuffer(GL_ARRAY_BUFFER, anim.bindPoseMutable.normalVBO->getBuffer());
+        renderer.VertexAttribPointer3fv("vNormal", 0, NULL);
+    }
+
+    glBindBuffer(GL_ARRAY_BUFFER, anim.boneIndices0VBO->getBuffer());
+    renderer.VertexAttribPointer4fv("aBoneIndices0", 0, NULL);
+    glBindBuffer(GL_ARRAY_BUFFER, anim.boneIndices1VBO->getBuffer());
+    renderer.VertexAttribPointer2fv("aBoneIndices1", 0, NULL);
+    glBindBuffer(GL_ARRAY_BUFFER, anim.boneWeights0VBO->getBuffer());
+    renderer.VertexAttribPointer4fv("aBoneWeights0", 0, NULL);
+    glBindBuffer(GL_ARRAY_BUFFER, anim.boneWeights1VBO->getBuffer());
+    renderer.VertexAttribPointer2fv("aBoneWeights1", 0, NULL);
+
+    glDrawArrays(GL_TRIANGLES, 0, static_cast<GLsizei>(anim.bindPoseMutable.data.PositionData.size()));
+
+    renderer.PopMatrix();
+    renderer.PopProjectionMatrix();
+    renderer.shaderManager.PopShader();
+}
+
 } // namespace ZL

src/Character.h

@@ -34,6 +34,8 @@ public:
     void setTarget(const Eigen::Vector3f& target,
                    std::function<void()> onArrived = nullptr);
     void draw(Renderer& renderer);
+    void drawShadowDepth(Renderer& renderer);
+    void drawWithShadow(Renderer& renderer, const Eigen::Matrix4f& lightFromCamera, GLuint shadowMapTex, const Eigen::Vector3f& lightDirCamera);
 
     // Public: read by Game for camera tracking and ray-cast origin
     Eigen::Vector3f position = Eigen::Vector3f(0.f, 0.f, 0.f);
@@ -97,6 +99,12 @@ private:
     void prepareGpuSkinningVBOs(AnimationData& anim);
     // GPU skinning: draw using shader-based skinning
     void drawGpuSkinning(Renderer& renderer);
+    // Shadow: draw into depth map (no texture, no projection push)
+    void drawShadowDepthGpuSkinning(Renderer& renderer);
+    void drawShadowDepthCpu(Renderer& renderer);
+    // Shadow: draw with shadow-aware shaders
+    void drawGpuSkinningWithShadow(Renderer& renderer, const Eigen::Matrix4f& lightFromCamera, GLuint shadowMapTex, const Eigen::Vector3f& lightDirCamera);
+    void drawCpuWithShadow(Renderer& renderer, const Eigen::Matrix4f& lightFromCamera, GLuint shadowMapTex, const Eigen::Vector3f& lightDirCamera);
 };
 
 } // namespace ZL

src/Game.cpp

@@ -250,7 +250,25 @@ namespace ZL
 		npcs.push_back(std::move(npc02));
 
 		std::cout << "Load resurces step 12" << std::endl;
-		
+
+		// Shadow mapping shaders
+#ifdef EMSCRIPTEN
+		renderer.shaderManager.AddShaderFromFiles("shadow_depth", "resources/shaders/shadow_depth.vertex", "resources/shaders/shadow_depth_web.fragment", CONST_ZIP_FILE);
+		renderer.shaderManager.AddShaderFromFiles("shadow_depth_skinning", "resources/shaders/shadow_depth_skinning.vertex", "resources/shaders/shadow_depth_web.fragment", CONST_ZIP_FILE);
+		renderer.shaderManager.AddShaderFromFiles("default_shadow", "resources/shaders/default_shadow.vertex", "resources/shaders/default_shadow_web.fragment", CONST_ZIP_FILE);
+		renderer.shaderManager.AddShaderFromFiles("skinning_shadow", "resources/shaders/skinning_shadow.vertex", "resources/shaders/default_shadow_web.fragment", CONST_ZIP_FILE);
+#else
+		renderer.shaderManager.AddShaderFromFiles("shadow_depth", "resources/shaders/shadow_depth.vertex", "resources/shaders/shadow_depth_desktop.fragment", CONST_ZIP_FILE);
+		renderer.shaderManager.AddShaderFromFiles("shadow_depth_skinning", "resources/shaders/shadow_depth_skinning.vertex", "resources/shaders/shadow_depth_desktop.fragment", CONST_ZIP_FILE);
+		renderer.shaderManager.AddShaderFromFiles("default_shadow", "resources/shaders/default_shadow.vertex", "resources/shaders/default_shadow_desktop.fragment", CONST_ZIP_FILE);
+		renderer.shaderManager.AddShaderFromFiles("skinning_shadow", "resources/shaders/skinning_shadow.vertex", "resources/shaders/default_shadow_desktop.fragment", CONST_ZIP_FILE);
+#endif
+
+		// Create shadow map (2048x2048, ortho size 40, near 0.1, far 100)
+		shadowMap = std::make_unique<ShadowMap>(2048, 40.0f, 0.1f, 100.0f);
+		shadowMap->setLightDirection(Eigen::Vector3f(-0.5f, -1.0f, -0.3f));
+		std::cout << "Shadow map initialized" << std::endl;
+
 		loadingCompleted = true;
 
 		dialogueSystem.init(renderer, CONST_ZIP_FILE);
@@ -455,6 +473,161 @@ namespace ZL
 
 	}
 	
+	void Game::drawShadowDepthPass()
+	{
+		if (!shadowMap) return;
+
+		const Eigen::Vector3f& sceneCenter = player ? player->position : Eigen::Vector3f::Zero();
+		shadowMap->updateLightSpaceMatrix(sceneCenter);
+
+		shadowMap->bind();
+
+		glEnable(GL_DEPTH_TEST);
+		glDepthFunc(GL_LESS);
+
+		// Use front-face culling during depth pass to reduce shadow acne on lit faces
+		//glCullFace(GL_FRONT);
+		glEnable(GL_CULL_FACE);
+
+		renderer.shaderManager.PushShader("shadow_depth");
+
+		// Set up light's orthographic projection
+		const Eigen::Matrix4f& lightProj = shadowMap->getLightProjectionMatrix();
+		const Eigen::Matrix4f& lightView = shadowMap->getLightViewMatrix();
+
+		// Push the light's projection matrix via the 6-param ortho overload won't
+		// match our pre-computed matrix. Instead, use the raw stack approach:
+		// push a dummy projection then overwrite via PushSpecialMatrix-style.
+		// Simpler: push ortho then push the light view as modelview.
+		renderer.PushProjectionMatrix(
+			-40.0f, 40.0f,
+			-40.0f, 40.0f,
+			0.1f, 100.0f);
+
+		const Eigen::Vector3f& lightDir = shadowMap->getLightDirection();
+		Eigen::Vector3f lightPos = sceneCenter - lightDir * 50.0f;
+		Eigen::Vector3f up(0.0f, 1.0f, 0.0f);
+		if (std::abs(lightDir.dot(up)) > 0.99f) {
+			up = Eigen::Vector3f(0.0f, 0.0f, 1.0f);
+		}
+
+		// Build the light view matrix and push it
+		renderer.PushSpecialMatrix(lightView);
+
+		// Draw static geometry
+		renderer.DrawVertexRenderStruct(roomMesh);
+
+		for (auto& [name, gameObj] : gameObjects) {
+			renderer.DrawVertexRenderStruct(gameObj.mesh);
+		}
+
+		for (auto& intObj : interactiveObjects) {
+			if (intObj.isActive && intObj.texture) {
+				renderer.PushMatrix();
+				renderer.TranslateMatrix(intObj.position);
+				renderer.DrawVertexRenderStruct(intObj.mesh);
+				renderer.PopMatrix();
+			}
+		}
+
+		// Draw characters (they handle their own skinning shader switch internally)
+		if (player) player->drawShadowDepth(renderer);
+		for (auto& npc : npcs) npc->drawShadowDepth(renderer);
+
+		renderer.PopMatrix();  // light view
+		renderer.PopProjectionMatrix();
+		renderer.shaderManager.PopShader();
+
+		//glCullFace(GL_BACK);
+		glDisable(GL_CULL_FACE);
+
+		shadowMap->unbind();
+	}
+
+	void Game::drawGameWithShadows()
+	{
+		glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+		glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
+
+#ifdef DEBUG_LIGHT
+		// Debug mode: render from the light's point of view using the plain
+		// textured shader so we can see what the shadow map "sees".
+		renderer.shaderManager.PushShader(defaultShaderName);
+		renderer.RenderUniform1i(textureUniformName, 0);
+
+		renderer.PushProjectionMatrix(
+			-40.0f, 40.0f,
+			-40.0f, 40.0f,
+			0.1f, 1000.0f);
+
+		renderer.PushSpecialMatrix(shadowMap->getLightViewMatrix());
+
+#else
+		static const std::string shadowShaderName = "default_shadow";
+
+		renderer.shaderManager.PushShader(shadowShaderName);
+		renderer.RenderUniform1i(textureUniformName, 0);
+		renderer.RenderUniform1i("uShadowMap", 1);
+
+		// Bind shadow map texture to unit 1
+		glActiveTexture(GL_TEXTURE1);
+		glBindTexture(GL_TEXTURE_2D, shadowMap->getDepthTexture());
+		glActiveTexture(GL_TEXTURE0);
+
+		renderer.PushPerspectiveProjectionMatrix(1.0 / 1.5,
+			static_cast<float>(Environment::width) / static_cast<float>(Environment::height),
+			Environment::CONST_Z_NEAR, Environment::CONST_Z_FAR);
+		renderer.PushMatrix();
+
+		renderer.LoadIdentity();
+		renderer.TranslateMatrix({ 0,0, -1.0f * Environment::zoom });
+
+		renderer.RotateMatrix(Eigen::Quaternionf(Eigen::AngleAxisf(cameraInclination, Eigen::Vector3f::UnitX())).toRotationMatrix());
+		renderer.RotateMatrix(Eigen::Quaternionf(Eigen::AngleAxisf(cameraAzimuth, Eigen::Vector3f::UnitY())).toRotationMatrix());
+		const Eigen::Vector3f& camTarget = player ? player->position : Eigen::Vector3f::Zero();
+		renderer.TranslateMatrix({ -camTarget.x(), -camTarget.y(), -camTarget.z() });
+
+		// Capture the camera view matrix and compute uLightFromCamera
+		cameraViewMatrix = renderer.GetCurrentModelViewMatrix();
+		Eigen::Matrix4f cameraViewInverse = cameraViewMatrix.inverse();
+		Eigen::Matrix4f lightFromCamera = shadowMap->getLightSpaceMatrix() * cameraViewInverse;
+		renderer.RenderUniformMatrix4fv("uLightFromCamera", false, lightFromCamera.data());
+
+		// Light direction in camera space for diffuse lighting
+		Eigen::Vector3f lightDirCamera = cameraViewMatrix.block<3,3>(0,0) * shadowMap->getLightDirection();
+		renderer.RenderUniform3fv("uLightDir", lightDirCamera.data());
+#endif
+
+		glBindTexture(GL_TEXTURE_2D, roomTexture->getTexID());
+		renderer.DrawVertexRenderStruct(roomMesh);
+
+		for (auto& [name, gameObj] : gameObjects) {
+			glBindTexture(GL_TEXTURE_2D, gameObj.texture->getTexID());
+			renderer.DrawVertexRenderStruct(gameObj.mesh);
+		}
+
+		for (auto& intObj : interactiveObjects) {
+			if (intObj.isActive) {
+				intObj.draw(renderer);
+			}
+		}
+
+#ifdef DEBUG_LIGHT
+		// In debug-light mode characters use the plain shaders (draw normally
+		// but from the light's viewpoint — projection/view already on stack).
+		if (player) player->draw(renderer);
+		for (auto& npc : npcs) npc->draw(renderer);
+#else
+		// Characters use their own shadow-aware shaders
+		if (player) player->drawWithShadow(renderer, lightFromCamera, shadowMap->getDepthTexture(), lightDirCamera);
+		for (auto& npc : npcs) npc->drawWithShadow(renderer, lightFromCamera, shadowMap->getDepthTexture(), lightDirCamera);
+#endif
+
+		renderer.PopMatrix();
+		renderer.PopProjectionMatrix();
+		renderer.shaderManager.PopShader();
+	}
+
 	void Game::drawScene() {
 		glViewport(0, 0, Environment::width, Environment::height);
 		if (!loadingCompleted) {
@@ -462,7 +635,12 @@ namespace ZL
 		}
 		else
 		{
-			drawGame();
+			if (shadowMap) {
+				drawShadowDepthPass();
+				drawGameWithShadows();
+			} else {
+				drawGame();
+			}
 			drawUI();
 		}
 		CheckGlError();

src/Game.h

@@ -22,6 +22,7 @@
 #include "ScriptEngine.h"
 #include <unordered_map>
 #include "dialogue/DialogueSystem.h"
+#include "render/ShadowMap.h"
 #include <unordered_set>
 
 namespace ZL {
@@ -98,6 +99,8 @@ namespace ZL {
 		void drawUI();
 		void drawGame();
 		void drawLoading();
+		void drawShadowDepthPass();
+		void drawGameWithShadows();
 		void handleDown(int64_t fingerId, int mx, int my);
 		void handleUp(int64_t fingerId, int mx, int my);
 		void handleMotion(int64_t fingerId, int mx, int my);
@@ -121,6 +124,9 @@ namespace ZL {
 		//MenuManager menuManager;
 		Dialogue::DialogueSystem dialogueSystem;
 		//ScriptEngine scriptEngine;
+
+		std::unique_ptr<ShadowMap> shadowMap;
+		Eigen::Matrix4f cameraViewMatrix = Eigen::Matrix4f::Identity();
 	};
 
 

src/render/ShadowMap.cpp

@@ -0,0 +1,124 @@
+#include "ShadowMap.h"
+#include "Environment.h"
+#include <iostream>
+#include <cmath>
+
+namespace ZL {
+
+    // Build a look-at view matrix (column-major, same convention as the engine).
+    static Eigen::Matrix4f lookAt(const Eigen::Vector3f& eye,
+                                   const Eigen::Vector3f& center,
+                                   const Eigen::Vector3f& up) {
+        Eigen::Vector3f f = (center - eye).normalized();
+        Eigen::Vector3f s = f.cross(up).normalized();
+        Eigen::Vector3f u = s.cross(f);
+
+        Eigen::Matrix4f m = Eigen::Matrix4f::Identity();
+        m(0, 0) = s.x();  m(0, 1) = s.y();  m(0, 2) = s.z();
+        m(1, 0) = u.x();  m(1, 1) = u.y();  m(1, 2) = u.z();
+        m(2, 0) = -f.x(); m(2, 1) = -f.y(); m(2, 2) = -f.z();
+
+        m(0, 3) = -s.dot(eye);
+        m(1, 3) = -u.dot(eye);
+        m(2, 3) = f.dot(eye);
+        return m;
+    }
+
+    // Build an orthographic projection matrix that matches the engine's
+    // MakeOrthoMatrix(xmin, xmax, ymin, ymax, zNear, zFar) exactly.
+    static Eigen::Matrix4f ortho(float left, float right,
+                                  float bottom, float top,
+                                  float zNear, float zFar) {
+        float width = right - left;
+        float height = top - bottom;
+        float depthRange = zFar - zNear;
+
+        Eigen::Matrix4f m = Eigen::Matrix4f::Zero();
+        m(0, 0) = 2.0f / width;
+        m(1, 1) = 2.0f / height;
+        m(2, 2) = -1.0f / depthRange;
+        m(0, 3) = -(right + left) / width;
+        m(1, 3) = -(top + bottom) / height;
+        m(2, 3) = zNear / depthRange;
+        m(3, 3) = 1.0f;
+        return m;
+    }
+
+    ShadowMap::ShadowMap(int res, float orthoSz, float zNear, float zFar)
+        : resolution(res)
+        , orthoSize(orthoSz)
+        , nearPlane(zNear)
+        , farPlane(zFar)
+        , lightDirection(Eigen::Vector3f(-0.5f, -1.0f, -0.3f).normalized())
+        , lightViewMatrix(Eigen::Matrix4f::Identity())
+        , lightProjectionMatrix(Eigen::Matrix4f::Identity())
+        , lightSpaceMatrix(Eigen::Matrix4f::Identity())
+    {
+        glGenFramebuffers(1, &fbo);
+
+        glGenTextures(1, &depthTexture);
+        glBindTexture(GL_TEXTURE_2D, depthTexture);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT,
+                     resolution, resolution, 0,
+                     GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
+                               GL_TEXTURE_2D, depthTexture, 0);
+
+        // No color buffer for this FBO — depth only.
+        glDrawBuffer(GL_NONE);
+        glReadBuffer(GL_NONE);
+
+        if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+            std::cerr << "Error: Shadow map framebuffer is not complete!" << std::endl;
+        }
+
+        glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    }
+
+    ShadowMap::~ShadowMap() {
+        if (fbo) glDeleteFramebuffers(1, &fbo);
+        if (depthTexture) glDeleteTextures(1, &depthTexture);
+    }
+
+    void ShadowMap::setLightDirection(const Eigen::Vector3f& dir) {
+        lightDirection = dir.normalized();
+    }
+
+    void ShadowMap::updateLightSpaceMatrix(const Eigen::Vector3f& sceneCenter) {
+        // Place the light "camera" looking at the scene center from the light direction.
+        Eigen::Vector3f lightPos = sceneCenter - lightDirection * (farPlane * 0.5f);
+
+        // Choose an up vector that isn't parallel to the light direction.
+        Eigen::Vector3f up(0.0f, 1.0f, 0.0f);
+        if (std::abs(lightDirection.dot(up)) > 0.99f) {
+            up = Eigen::Vector3f(0.0f, 0.0f, 1.0f);
+        }
+
+        lightViewMatrix = lookAt(lightPos, sceneCenter, up);
+
+        lightProjectionMatrix = ortho(
+            -orthoSize, orthoSize,
+            -orthoSize, orthoSize,
+            nearPlane, farPlane);
+
+        lightSpaceMatrix = lightProjectionMatrix * lightViewMatrix;
+    }
+
+    void ShadowMap::bind() {
+        glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+        glViewport(0, 0, resolution, resolution);
+        glClear(GL_DEPTH_BUFFER_BIT);
+    }
+
+    void ShadowMap::unbind() {
+        glBindFramebuffer(GL_FRAMEBUFFER, 0);
+        glViewport(0, 0, Environment::width, Environment::height);
+    }
+
+} // namespace ZL

src/render/ShadowMap.h

@@ -0,0 +1,44 @@
+#pragma once
+#include "render/OpenGlExtensions.h"
+#include <Eigen/Dense>
+
+namespace ZL {
+
+    class ShadowMap {
+    private:
+        GLuint fbo = 0;
+        GLuint depthTexture = 0;
+        int resolution;
+
+        Eigen::Vector3f lightDirection;
+        Eigen::Matrix4f lightViewMatrix;
+        Eigen::Matrix4f lightProjectionMatrix;
+        Eigen::Matrix4f lightSpaceMatrix;
+
+        float orthoSize;
+        float nearPlane;
+        float farPlane;
+
+    public:
+        ShadowMap(int resolution = 2048, float orthoSize = 40.0f,
+                  float zNear = 0.1f, float zFar = 100.0f);
+        ~ShadowMap();
+
+        ShadowMap(const ShadowMap&) = delete;
+        ShadowMap& operator=(const ShadowMap&) = delete;
+
+        void setLightDirection(const Eigen::Vector3f& dir);
+        void updateLightSpaceMatrix(const Eigen::Vector3f& sceneCenter);
+
+        void bind();
+        void unbind();
+
+        GLuint getDepthTexture() const { return depthTexture; }
+        int getResolution() const { return resolution; }
+        const Eigen::Matrix4f& getLightSpaceMatrix() const { return lightSpaceMatrix; }
+        const Eigen::Matrix4f& getLightViewMatrix() const { return lightViewMatrix; }
+        const Eigen::Matrix4f& getLightProjectionMatrix() const { return lightProjectionMatrix; }
+        const Eigen::Vector3f& getLightDirection() const { return lightDirection; }
+    };
+
+} // namespace ZL