enhanced Texture and FrameBuffer class to prepare incoming features on shadowmaps

shaders/gbuffer.geom.glsl

@@ -0,0 +1,22 @@
+#version 330 core
+
+layout(triangles) in;
+layout(triangle_strip, max_vertices = 18) out;
+
+uniform mat4 view[6];
+uniform mat4 proj;
+
+// debug parameter
+flat out int fcolor_idx;
+
+void main(void){
+    for (int layerId = 0; layerId < 6; ++layerId){
+        for (int i = 0; i < gl_in.length(); ++i){
+            gl_Layer = layerId;
+            fcolor_idx = layerId;
+            gl_Position = proj * view[layerId] * gl_in[i].gl_Position;
+            EmitVertex();
+        }
+        EndPrimitive();
+    }
+}

src/deferredmodule.cpp

@@ -30,6 +30,6 @@ GBuffer::GBuffer(int width, int height) : FrameBuffer()
 
 GBuffer::~GBuffer()
 {
-    for(Texture* t : textures)
+    for(Texture* t : m_textures)
         delete(t);
 }

src/framebuffer.cpp

@@ -6,16 +6,17 @@
 const FrameBuffer* FrameBuffer::screen = new FrameBuffer(0);
 
 FrameBuffer::FrameBuffer() :
-    allocated(true)
+    allocated(true),
+    m_target(GL_FRAMEBUFFER)
 {
-    glGenFramebuffers(1, &fbo);
+    glGenFramebuffers(1, &m_frameBufferId);
 }
 
 FrameBuffer::~FrameBuffer()
 {
     if(allocated)
-        glDeleteFramebuffers(1, &fbo);
-    for(Texture* t : textures)
+        glDeleteFramebuffers(1, &m_frameBufferId);
+    for(Texture* t : m_textures)
     {
         t->unbind();
         delete(t);
@@ -24,48 +25,45 @@ FrameBuffer::~FrameBuffer()
 
 void FrameBuffer::addTexture(Texture* tex, GLenum attachment)
 {
-    if(fbo != 0)
+    if(m_frameBufferId != 0)
     {
-        textures.push_back(tex);
+        m_textures.push_back(tex);
         bindFBO();
         if(tex->isCubeMap())
-        {
-            // TODO
-            // http://cg.siomax.ru/index.php/computer-graphics/10-one-pass-rendering-to-cube-map
-        }
+            glFramebufferTexture(m_target, attachment, tex->getId(), 0);
         else
-        {
             glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, tex->getTarget(), tex->getId(), 0);
-            if(attachment != GL_DEPTH_ATTACHMENT) // TODO stencil attachment must be tested too
-                attachments.push_back(attachment);
-        }
-
+        if((attachment != GL_DEPTH_ATTACHMENT && attachment != GL_STENCIL_ATTACHMENT) && attachment != GL_DEPTH_STENCIL_ATTACHMENT)
+            m_attachments.push_back(attachment);
     }
 }
 
 void FrameBuffer::initColorAttachments()
 {
-    if(fbo != 0 && attachments.size() != 0)
+    if(m_frameBufferId != 0 && m_attachments.size() != 0)
     {
         bindFBO();
-        glDrawBuffers(attachments.size(), attachments.data());
+        glDrawBuffers(m_attachments.size(), m_attachments.data());
     }
     else
+    {
         glDrawBuffer(GL_NONE);
+        glReadBuffer(GL_NONE);
+    }
     check();
 }
 
 void FrameBuffer::deleteTextures()
 {
-    for(Texture* t : textures)
+    for(Texture* t : m_textures)
         delete(t);
-    textures.clear();
+    m_textures.clear();
     glDrawBuffer(GL_NONE);
 }
 
-void FrameBuffer::bindFBO(GLenum target) const
+void FrameBuffer::bindFBO() const
 {
-    glBindFramebuffer(target, fbo);
+    glBindFramebuffer(m_target, m_frameBufferId);
 }
 
 bool FrameBuffer::check()
@@ -100,8 +98,8 @@ bool FrameBuffer::check()
 
 Texture* FrameBuffer::getTexture(int texId)
 {
-    if(fbo != 0)
-        return textures[texId];
+    if(m_frameBufferId != 0)
+        return m_textures[texId];
     else
         return NULL;
 }

src/framebuffer.h

@@ -15,9 +15,10 @@ protected:
     bool check();
 
     const bool allocated;
-    GLuint fbo;
-    std::vector<Texture*> textures;
-    std::vector<GLuint> attachments;
+    GLenum m_target;
+    GLuint m_frameBufferId;
+    std::vector<Texture*> m_textures;
+    std::vector<GLuint> m_attachments;
 
 public:
     /**
@@ -30,7 +31,7 @@ public:
     /**
      * @brief this constructor is only used to get a handle on an existing Framebuffer created by another library
      */
-    FrameBuffer(GLuint id) : allocated(false), fbo(id) {}
+    FrameBuffer(GLuint id) : allocated(false), m_target(GL_FRAMEBUFFER), m_frameBufferId(id) {}
 
     /**
      * @brief the destructor does not destroy the textures, however, deleteTextures will do that
@@ -43,10 +44,13 @@ public:
 
     void deleteTextures();
 
+    void setTarget(GLenum target = GL_FRAMEBUFFER) { m_target = target; }
+
     /**
-     * @brief bindFBO binds the framebuffer on the specified target
+     * @brief bindFBO binds the framebuffer
+     * to unbind the framebuffer (bind the screen), you can use FrameBuffer::screen->bindFBO();
      */
-    void bindFBO(GLenum target = GL_FRAMEBUFFER) const;
+    void bindFBO() const;
 
     /**
      * @brief getTexture returns an attached texture, indexed from their adding order.

src/light.cpp

@@ -27,93 +27,117 @@ const glm::mat4 Light::biasMatrix(
 
 Light::Light()
 {
-    initPointLight();
+    initAmbientLight();
 }
 
 void Light::initAmbientLight(glm::vec3 lightColor)
 {
-    type = AMBIENT;
-    position = glm::vec3(0);
-    color = lightColor;
-    shadowCaster = false;
-    isDir = false;
-    viewMatrix = glm::mat4();
+    m_type = AMBIENT;
+    m_position = glm::vec3(0); // not used
+    m_direction = glm::vec3(0, 0, 1); // not used
+    m_cutOffAngle = 0; // not used
+    m_color = lightColor;
+    m_attenuation = 0; // not used
+    m_shadowCaster = false; // not used
 }
 
 void Light::initDirectionnalLight(glm::vec3 dir, glm::vec3 lightColor)
 {
-    type = DIRECTIONNAL;
-    position = glm::vec3(0);
-    direction = dir;
-    color = lightColor;
-    shadowCaster = false;
-    isDir = true;
-    viewMatrix = glm::lookAt(position, position+direction, glm::vec3(0, 1, 0));
+    m_type = DIRECTIONNAL;
+    m_position = glm::vec3(0); // not used
+    m_direction = dir;
+    m_cutOffAngle = 0; // not used
+    m_color = lightColor;
+    m_attenuation = 0; // not used
+    m_shadowCaster = false;
 }
 
 void Light::initPointLight(glm::vec3 pos, glm::vec3 lightColor, float att)
 {
-    type = POINT;
-    position = pos;
-    cutOffAngle = 360;
-    color = lightColor;
-    shadowCaster = false;
-    isDir = false;
-    viewMatrix = glm::mat4();
-    attenuation = att;
+    m_type = POINT;
+    m_position = pos;
+    m_direction = glm::vec3(0, 0, 1); // used to orient the shadowmap
+    m_cutOffAngle = 0; // not used
+    m_color = lightColor;
+    m_attenuation = att;
+    m_shadowCaster = false;
 }
 
-void Light::initSpotLight(glm::vec3 pos, glm::vec3 dir, float spotAngle, glm::vec3 lightColor)
+void Light::initSpotLight(glm::vec3 pos, glm::vec3 dir, float spotAngle, glm::vec3 lightColor, float att)
 {
-    type = SPOT;
-    position = pos;
-    direction = dir;
-    cutOffAngle = spotAngle;
-    color = lightColor;
-    shadowCaster = false;
-    isDir = false;
+    m_type = SPOT;
+    m_position = pos;
+    m_direction = dir;
+    m_cutOffAngle = spotAngle;
+    m_color = lightColor;
+    m_attenuation = att;
+    m_shadowCaster = false;
 }
 
-bool Light::isDirectionnal()
+void Light::initShadowMap(int resolution, glm::vec3 dim)
 {
-    return isDir;
-}
+    m_shadowMapResolution = resolution;
+    Texture* tex;
 
-void Light::initShadowMap(int resWidth, int resHeight, glm::vec3 dim)
-{
-    shadowMapWidth = resWidth;
-    shadowMapHeight = resHeight;
-    viewMatrix = glm::lookAt(position, position-direction, glm::vec3(0, 1, 0));
-    if(type == DIRECTIONNAL)
-        projectionMatrix = glm::ortho(-dim.x/2, dim.x/2, -dim.y/2, dim.y/2, -dim.z/2, dim.z/2);
-    else
-        ; // TODO : glm::projection
+    switch(m_type)
+    {
+    case DIRECTIONNAL:
+        // 3 orthogonal matrices (cascaded shadowmaps)
+        // 3 square textures
+        m_viewMatrix = glm::lookAt(m_position, m_position-m_direction, glm::vec3(0, 1, 0));
+        m_projectionMatrix = glm::ortho(-dim.x/2, dim.x/2, -dim.y/2, dim.y/2, -dim.z/2, dim.z/2);
+        tex = new Texture(GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, resolution, resolution, GL_FLOAT, GL_TEXTURE_2D);
+        break;
+    case POINT:
+        // see http://learnopengl.com/#!Advanced-Lighting/Shadows/Point-Shadows
 
-    shadowCaster = true;
-    shadowMap = new FrameBuffer();
-    // Depth buffer
-    Texture* tex = new Texture(GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, resWidth, resHeight, GL_FLOAT);
-    tex->setFiltering(GL_LINEAR);
-    tex->setWrap(GL_CLAMP_TO_EDGE);
-    tex->setParameter(GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
-    tex->setParameter(GL_TEXTURE_COMPARE_FUNC, GL_LESS);
-    shadowMap->addTexture(tex, GL_DEPTH_ATTACHMENT);
-    shadowMap->initColorAttachments();
+        // 6 projection matrices
+        // 1 cubemap texture
+        m_viewMatrix = glm::lookAt(m_position, m_position-glm::vec3(0, 0, 1), glm::vec3(0, 1, 0));
+        m_projectionMatrix = glm::perspective(90.f, 1.f, 0.1f, 100.f);
+        tex = new Texture(GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, resolution, resolution, GL_FLOAT, GL_TEXTURE_CUBE_MAP);
+        break;
+    case SPOT:
+        // 1 projection matrix
+        // 1 square texture
+        m_viewMatrix = glm::lookAt(m_position, m_position+m_direction, glm::vec3(0, 1, 0));
+        m_projectionMatrix = glm::perspective(m_cutOffAngle, 1.f, 0.1f, 100.f);
+        tex = new Texture(GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT, resolution, resolution, GL_FLOAT, GL_TEXTURE_2D);
+        break;
+    case AMBIENT:
+        return;
+    }
 
+    // shader compilation
+    // TODO : do not compile shader for every light
     ShaderSource source;
     Resource::ResourceMap shaderMap;
     Resource::getResourcePack_shaders(shaderMap);
     source.setSource(shaderMap["shaders/shadow.vert.glsl"], ShaderSource::VERTEX);
+    if(m_type == POINT)
+        source.setSource(shaderMap["shaders/shadow.geom.glsl"], ShaderSource::GEOMETRY);
     source.setSource(shaderMap["shaders/shadow.frag.glsl"], ShaderSource::FRAGMENT);
-    shaders[0] = source.compile(Mesh::MESH_3D, getFlags());
-    shaders[1] = source.compile(Mesh::MESH_3D & Mesh::MATERIAL_ALPHA_MASK, getFlags());
+    m_shaders[0] = source.compile(Mesh::MESH_3D, getFlags());
+    m_shaders[1] = source.compile(Mesh::MESH_3D & Mesh::MATERIAL_ALPHA_MASK, getFlags());
+
+    // Depth buffer
+    tex->setFiltering(GL_LINEAR);
+    tex->setWrap(GL_CLAMP_TO_EDGE);
+    tex->setParameter(GL_TEXTURE_COMPARE_MODE, GL_COMPARE_REF_TO_TEXTURE);
+    tex->setParameter(GL_TEXTURE_COMPARE_FUNC, GL_LESS);
+
+    // framebuffer
+    m_shadowCaster = true;
+    m_shadowMap = new FrameBuffer();
+    m_shadowMap->addTexture(tex, GL_DEPTH_ATTACHMENT);
+    m_shadowMap->initColorAttachments();
 }
 
 void Light::generateShadowMap(Scene* scene)
 {
     glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
-    glViewport(0, 0, shadowMapWidth, shadowMapHeight);
-    shadowMap->bindFBO();
+    glViewport(0, 0, m_shadowMapResolution, m_shadowMapResolution);
+    m_shadowMap->bindFBO();
     glClearDepth(1.0);
     glClear(GL_DEPTH_BUFFER_BIT);
     glEnable(GL_DEPTH_TEST);
@@ -128,9 +152,9 @@ void Light::generateShadowMap(Scene* scene)
             // compute matrix attributes
             glm::mat4 lightMVP = getProjectionMatrix() * (getViewMatrix() * node->modelMatrix);
             int hasAlpha = (node->mesh->getFlags() & (1 << Mesh::MATERIAL_ALPHA_MASK)) > 0;
-            shaders[hasAlpha]->bind();
-            shaders[hasAlpha]->bindMat4(shaders[hasAlpha]->getLocation("MVP"), lightMVP);
-            node->mesh->draw(shaders[hasAlpha], false, hasAlpha, false);
+            m_shaders[hasAlpha]->bind();
+            m_shaders[hasAlpha]->bindMat4(m_shaders[hasAlpha]->getLocation("MVP"), lightMVP);
+            node->mesh->draw(m_shaders[hasAlpha], false, hasAlpha, false);
         }
     }
     //glCullFace(GL_BACK);
@@ -138,19 +162,19 @@ void Light::generateShadowMap(Scene* scene)
 
 Texture* Light::getShadowMap()
 {
-    return shadowMap->getTexture(0);
+    return m_shadowMap->getTexture(0);
 }
 
 void Light::setPosition(glm::vec3 new_pos)
 {
-    position = new_pos;
-    viewMatrix = glm::lookAt(position, position+direction, glm::vec3(0, 1, 0));
+    m_position = new_pos;
+    m_viewMatrix = glm::lookAt(m_position, m_position+m_direction, glm::vec3(0, 1, 0));
 }
 
 unsigned int Light::getFlags()
 {
     unsigned int flags = 0;
-    switch(type)
+    switch(m_type)
     {
     case AMBIENT :
         flags = 1 << AMBIENT_FLAG;
@@ -165,7 +189,7 @@ unsigned int Light::getFlags()
         flags = 1 << SPOT_FLAG;
         break;
     }
-    if(shadowCaster)
+    if(m_shadowCaster)
         flags |= 1 << SHADOWMAP_FLAG;
     return flags;
 }

src/light.h

@@ -36,27 +36,26 @@ public:
     void initAmbientLight(glm::vec3 lightColor = glm::vec3(0.1f));
     void initDirectionnalLight(glm::vec3 dir = glm::vec3(0, -1, 0), glm::vec3 lightColor = glm::vec3(1));
     void initPointLight(glm::vec3 pos = glm::vec3(0), glm::vec3 lightColor = glm::vec3(1), float att = 1);
-    void initSpotLight(glm::vec3 pos = glm::vec3(0), glm::vec3 dir = glm::vec3(1, 0, 0), float spotAngle = 360, glm::vec3 lightColor = glm::vec3(1));
+    void initSpotLight(glm::vec3 pos = glm::vec3(0), glm::vec3 dir = glm::vec3(1, 0, 0), float spotAngle = 360, glm::vec3 lightColor = glm::vec3(1), float att = 1);
 
-    bool isDirectionnal();
-    LightType getType() {return type;}
-    glm::vec3 getDir() {return direction;}
-    glm::vec3 getPos() {return position;}
-    glm::vec3 getColor() {return color;}
-    float getAttenuation() {return attenuation;}
+    LightType getType() {return m_type;}
+    glm::vec3 getDir() {return m_direction;}
+    glm::vec3 getPos() {return m_position;}
+    glm::vec3 getColor() {return m_color;}
+    float getAttenuation() {return m_attenuation;}
 
-    bool isShadowCaster() {return shadowCaster;}
-    void initShadowMap(int resWidth, int resHeight, glm::vec3 dim = glm::vec3(1));
+    bool isShadowCaster() {return m_shadowCaster;}
+    void initShadowMap(int resolution, glm::vec3 dim = glm::vec3(1));
     void generateShadowMap(Scene* scene);
     Texture* getShadowMap();
 
-    void setAttenuation(float a) {attenuation = a;}
+    void setAttenuation(float a) {m_attenuation = a;}
     void setPosition(glm::vec3 new_pos);
-    void setColor(glm::vec3 new_color) {color = new_color;}
+    void setColor(glm::vec3 new_color) {m_color = new_color;}
 
     // camera inheritance
-    glm::mat4 getProjectionMatrix() {return projectionMatrix;}
-    glm::mat4 getViewMatrix() {return viewMatrix;}
+    glm::mat4 getProjectionMatrix() {return m_projectionMatrix;}
+    glm::mat4 getViewMatrix() {return m_viewMatrix;}
     // does nothing, just required for inheriting Camera
     void resize(int width, int height) {}
 
@@ -66,24 +65,21 @@ public:
     unsigned int getFlags();
 private:
     // standard attributes
-    LightType type;
+    LightType m_type;
 
-    glm::vec3 position;
-    glm::vec3 direction;
-    float cutOffAngle;
-    float attenuation;
-    glm::vec3 color;
-
-    bool isDir;
+    glm::vec3 m_position;
+    glm::vec3 m_direction;
+    float m_cutOffAngle;
+    float m_attenuation;
+    glm::vec3 m_color;
 
     // shadowmap attributes
-    bool shadowCaster;
-    int shadowMapWidth;
-    int shadowMapHeight;
-    FrameBuffer* shadowMap;
-    Shader* shaders[2];
-    glm::mat4 viewMatrix;
-    glm::mat4 projectionMatrix;
+    bool m_shadowCaster;
+    int m_shadowMapResolution;
+    FrameBuffer* m_shadowMap;
+    Shader* m_shaders[2];
+    glm::mat4 m_viewMatrix;
+    glm::mat4 m_projectionMatrix;
 };
 
 #endif // LIGHT_H

src/texture.h

@@ -33,7 +33,7 @@ public:
     // creates a standard texture from an image
     Texture(Image* myImage, bool makeMipMaps = true);
     // creates a cubeMap from 6 images
-	 Texture(Image* myCubemapImages[6], bool makeMipMaps = true);
+    Texture(Image* myCubemapImages[6], bool makeMipMaps = true);
     // creates a texture from another
     Texture(Texture* tex, bool halfDim = false);
 

src/textureblur.cpp

@@ -66,8 +66,10 @@ void TextureBlur::blur()
     {
         FrameBuffer* src = fbos + i;
         FrameBuffer* dst = fbos + (i + 1);
-        src->bindFBO(GL_READ_FRAMEBUFFER);
-        dst->bindFBO(GL_DRAW_FRAMEBUFFER);
+        src->setTarget(GL_READ_FRAMEBUFFER);
+        src->bindFBO();
+        dst->setTarget(GL_DRAW_FRAMEBUFFER);
+        dst->bindFBO();
         glBlitFramebuffer(0, 0,
                                    src->getTexture(0)->getWidth(),
                                    src->getTexture(0)->getHeight(),