point light shadows are implemented, but not working yet

shaders/lighting.frag.glsl

@@ -16,13 +16,18 @@ uniform sampler2DRect depthBuffer;
 uniform vec3 lightColor;
 
 #ifdef SHADOWMAP
+#ifdef POINT_LIGHT
+uniform samplerCubeShadow shadowMap;
+uniform mat3 inverseViewMatrix;
+#else
 uniform sampler2DShadow shadowMap;
 uniform mat4 viewToLightMatrix;
 #endif
+#endif
 
 #if defined POINT_LIGHT
 uniform vec3 pointLight;
-uniform float attenuation;
+uniform float range;
 #elif defined DIRECTIONNAL_LIGHT
 uniform vec3 dirLight;
 #elif defined SPOT_LIGHT
@@ -84,11 +89,6 @@ vec3 testLighting(in vec3 kd, in vec3 ks, in float ns, in vec3 color, in vec3 no
     return color*diffuseComponent*(kd+ks*CookTorranceSpecularHighlight(ks, ns, normal, lightDir, halfVec, viewDir));
 }
 
-float computeShadow(sampler2D shadowmap, vec3 shadow){
-    float lightFragDepth = texture(shadowmap, shadow.xy).r;
-    return lightFragDepth < shadow.z ? 0 : 1;
-}
-
 // MAIN PROGRAM
 
 void main(void) {
@@ -103,9 +103,13 @@ void main(void) {
     float depth = texelFetch(depthBuffer, texCoord).r;
 
 #ifdef SHADOWMAP
+    #ifdef POINT_LIGHT
+    float shadow = 1;
+    #else
     vec4 fragInLightSpace = viewToLightMatrix * fragPos;
     fragInLightSpace.z = fragInLightSpace.z - 0.002;
     float shadow = texture(shadowMap, fragInLightSpace.xyz/fragInLightSpace.w);
+    #endif
 #else
     float shadow = 1;
 #endif
@@ -113,10 +117,11 @@ void main(void) {
     float att = 1;
 #ifdef POINT_LIGHT
     vec3 dirLight = pointLight - fragPos.xyz;
-    float dist = length(dirLight);
-    if(dist > attenuation)
-        att = 0;
-    att = 1 - dist/attenuation;
+    vec4 pointShadowParam = vec4(inverseViewMatrix * dirLight, length(dirLight));
+    att = texture(shadowMap, pointShadowParam);
+    //outColor = vec4(vec3(texture(shadowMap, vec4(inverseViewMatrix * dirLight, length(dirLight))).r), 1);
+    //return;
+    att = clamp(att, 0, 1);
     dirLight = normalize(dirLight);
 #endif
 

shaders/shadow.geom.glsl

@@ -16,13 +16,14 @@ out vec4 FragPos;
 flat out int fcolor_idx;
 
 void main(void){
-    for (int layerId = 0; layerId < 6; ++layerId){
+    for (int layerId = 0; layerId < 6; ++layerId)
+    {
         mat4 MVP = projectionMatrix * viewMatrices[layerId];
-        for (int i = 0; i < gl_in.length(); ++i){
         gl_Layer = layerId;
         fcolor_idx = layerId;
-            FragPos = gl_in[i].gl_Position;
-            gl_Position = MVP * FragPos;
+        for (int i = 0; i < 3; ++i)
+        {
+            gl_Position = MVP * gl_in[i].gl_Position;
             EmitVertex();
         }
         EndPrimitive();

src/camera.h

@@ -22,13 +22,14 @@ class BasicCamera : public Camera
         float m_fov;
         float m_near;
         float m_far;
-        float m_ratio;
+        float m_width;
+        float m_height;
         
-        void computeProj() { m_projection = glm::perspective(m_fov, m_ratio, m_near, m_far); }
+        void computeProj() { m_projection = glm::perspectiveFov(m_fov, m_width, m_height, m_near, m_far); }
         
     public:
         BasicCamera(float myFov = 70.f, float myNear = 0.1f, float myFar = 100.f) :
-            m_fov(myFov), m_near(myNear), m_far(myFar), m_ratio(1.f)
+            m_fov(myFov), m_near(myNear), m_far(myFar), m_width(800.f), m_height(600.f)
         {
             computeProj();
             setView(glm::vec3(0), glm::vec3(0, 0, 1));
@@ -40,7 +41,8 @@ class BasicCamera : public Camera
         {
             if(width > 0 && height > 0)
             {
-                m_ratio = float(width)/float(height);
+                m_width = width;
+                m_height = height;
                 computeProj();
             }
         }

src/light.cpp

@@ -236,9 +236,9 @@ void DirectionnalLight::updateShadowMap(Scene* scene)
 int PointLight::m_shaderRefCounter = 0;
 Shader* PointLight::m_shaders[2] = {NULL};
 
-PointLight::PointLight(glm::vec3 pos, float attenuation, glm::vec3 lightColor) :
+PointLight::PointLight(glm::vec3 pos, float range, glm::vec3 lightColor) :
     m_position(pos),
-    m_attenuation(attenuation),
+    m_range(range),
     m_shadowCaster(false)
     
 {
@@ -251,11 +251,12 @@ void PointLight::bindAttributes(Shader *shader, Camera *camera)
     glm::vec4 posInView = camera->getViewMatrix() * glm::vec4(m_position.x, m_position.y, m_position.z, 1.f);
     shader->bindVec3(shader->getLocation("lightColor"), m_color);
     shader->bindVec3(shader->getLocation("pointLight"), glm::vec3(posInView));
-    shader->bindFloat(shader->getLocation("attenuation"), m_attenuation);
+    shader->bindFloat(shader->getLocation("range"), m_range);
     if(m_shadowCaster)
     {
         m_shadowMap->getTexture(0)->bind(7); // TODO use something else than 7
         shader->bindInteger(shader->getLocation("shadowMap"), 7);
+        shader->bindMat3(shader->getLocation("inverseViewMatrix"), glm::inverse(glm::mat3(camera->getViewMatrix())));
     }
 }
 
@@ -298,6 +299,8 @@ void PointLight::initShadowMap(int resolution)
     m_shadowMap = new FrameBuffer();
     m_shadowMap->addTexture(tex, GL_DEPTH_ATTACHMENT);
     m_shadowMap->initColorAttachments();
+
+    m_projectionMatrix = glm::perspective(90.f, 1.f, 0.01f, m_range);
 }
 
 void PointLight::destroyShadowMap()
@@ -320,8 +323,8 @@ void PointLight::destroyShadowMap()
 void PointLight::updateShadowMap(Scene* scene)
 {
     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-    glViewport(0, 0, m_shadowMapResolution, m_shadowMapResolution);
     m_shadowMap->bindFBO();
+    glViewport(0, 0, m_shadowMapResolution, m_shadowMapResolution);
     glClearDepth(1.0);
     glClear(GL_DEPTH_BUFFER_BIT);
     glEnable(GL_DEPTH_TEST);
@@ -339,9 +342,11 @@ void PointLight::updateShadowMap(Scene* scene)
             m_shaders[shaderId]->bindMat4(m_shaders[shaderId]->getLocation("projectionMatrix"), m_projectionMatrix);
             m_shaders[shaderId]->bindMat4Array(m_shaders[shaderId]->getLocation("viewMatrices"), m_viewMatrices, 6);
             m_shaders[shaderId]->bindVec3(m_shaders[shaderId]->getLocation("pointLight"), m_position);
+            m_shaders[shaderId]->bindFloat(m_shaders[shaderId]->getLocation("far_plane"), m_range);
             node->mesh->draw(m_shaders[shaderId], false, shaderId, false);
         }
     }
+    FrameBuffer::screen->bindFBO();
 }
     
 // OLD IMPLEMENTATION

src/light.h

@@ -95,10 +95,10 @@ public:
     PointLight(glm::vec3 pos = glm::vec3(0), float attenuation = 1, glm::vec3 lightColor = glm::vec3(1));
 
     glm::vec3 getPos() { return m_position; }
-    float getAttenuation() { return m_attenuation; }
+    float getAttenuation() { return m_range; }
     
     void setPos(glm::vec3 pos) { m_position = pos; /* TODO : update projection matrix */ }
-    void setAttenuation(float attenuation) { m_attenuation = attenuation; }
+    void setAttenuation(float attenuation) { m_range = attenuation; }
     
     virtual LightType getType() { return POINT; }
     virtual void bindAttributes(Shader *shader, Camera *camera);
@@ -110,7 +110,7 @@ public:
     
 private:
     glm::vec3 m_position;
-    float m_attenuation;
+    float m_range;
     
     bool m_shadowCaster;
     int m_shadowMapResolution;

src/trackballcamera.cpp

@@ -30,7 +30,7 @@ void TrackBallCamera::moveCamera(float dx, float dy)
     glm::mat4 MVP = m_projection * m_view;
     glm::mat4 inverseMVP = glm::inverse(MVP);
     screenPos = MVP * screenPos;
-    glm::vec4 pos(dx, -dy, (m_dist/m_far)*2 - 1, 1);
+    glm::vec4 pos(dx/m_width, -dy/m_height, (m_dist/m_far)*2 - 1, 1);
     pos *= screenPos.w;
     glm::vec4 diff = (inverseMVP * glm::vec4(0, 0, pos.z, pos.w)) - (inverseMVP * pos);
     moveCamera(glm::vec3(diff));