Bloom effect added, will have to see if it needs improving. Also added HDR colors and gamma correction.

2016-01-21 12:02:28 +01:00
parent 86824f1b1f
commit 983f90504d
16 changed files with 398 additions and 105 deletions
@@ -0,0 +1,121 @@
+#include "Rendering/DrawBloomPass.h"
+
+DrawBloomPass::DrawBloomPass(IRenderer* renderer)
+{
+    m_Renderer = renderer;
+
+    m_ScreenQuad = ResourceManager::Load<Model>("Models/Core/ScreenQuad.obj");
+
+    InitializeTextures();
+    InitializeBuffers();
+    InitializeShaderPrograms();
+}
+
+void DrawBloomPass::InitializeTextures()
+{
+    m_WhiteTexture = ResourceManager::Load<Texture>("Textures/Core/Blank.png");
+}
+
+void DrawBloomPass::InitializeShaderPrograms()
+{
+    m_GaussianProgram_horiz = ResourceManager::Load<ShaderProgram>("##GaussianProgramHoriz");
+    m_GaussianProgram_horiz->AddShader(std::shared_ptr<Shader>(new VertexShader("Shaders/Gaussian_horiz.vert.glsl")));
+    m_GaussianProgram_horiz->AddShader(std::shared_ptr<Shader>(new FragmentShader("Shaders/Gaussian_horiz.frag.glsl")));
+    m_GaussianProgram_horiz->Compile();
+    m_GaussianProgram_horiz->Link();
+
+    m_GaussianProgram_vert = ResourceManager::Load<ShaderProgram>("##GaussianProgramVert");
+    m_GaussianProgram_vert->AddShader(std::shared_ptr<Shader>(new VertexShader("Shaders/Gaussian_vert.vert.glsl")));
+    m_GaussianProgram_vert->AddShader(std::shared_ptr<Shader>(new FragmentShader("Shaders/Gaussian_vert.frag.glsl")));
+    m_GaussianProgram_vert->Compile();
+    m_GaussianProgram_vert->Link();
+}
+
+
+void DrawBloomPass::InitializeBuffers()
+{
+    GenerateTexture(&m_GaussianTexture_horiz, GL_CLAMP_TO_EDGE, GL_LINEAR, glm::vec2(m_Renderer->Resolution().Width, m_Renderer->Resolution().Height), GL_RGB16F, GL_RGB, GL_FLOAT);
+
+    m_GaussianFrameBuffer_horiz.AddResource(std::shared_ptr<BufferResource>(new Texture2D(&m_GaussianTexture_horiz, GL_COLOR_ATTACHMENT0)));
+    m_GaussianFrameBuffer_horiz.Generate();
+
+    GenerateTexture(&m_GaussianTexture_vert, GL_CLAMP_TO_EDGE, GL_LINEAR, glm::vec2(m_Renderer->Resolution().Width, m_Renderer->Resolution().Height), GL_RGB16F, GL_RGB, GL_FLOAT);
+
+    m_GaussianFrameBuffer_vert.AddResource(std::shared_ptr<BufferResource>(new Texture2D(&m_GaussianTexture_vert, GL_COLOR_ATTACHMENT0)));
+    m_GaussianFrameBuffer_vert.Generate();
+}
+
+void DrawBloomPass::Draw(GLuint texture)
+{
+    GLERROR("DrawBloomPass::Draw: Pre");
+
+    DrawBloomPassState state;
+
+    GLuint shaderHandle_horiz = m_GaussianProgram_horiz->GetHandle();
+    GLuint shaderHandle_vert = m_GaussianProgram_vert->GetHandle();
+
+
+    //Horizontal pass, first use the given texture then save it to the horizontal framebuffer.
+    m_GaussianFrameBuffer_horiz.Bind();
+    m_GaussianProgram_horiz->Bind();
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texture);
+
+    glBindVertexArray(m_ScreenQuad->VAO);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ScreenQuad->ElementBuffer);
+    glDrawElementsBaseVertex(GL_TRIANGLES, m_ScreenQuad->MaterialGroups()[0].EndIndex - m_ScreenQuad->MaterialGroups()[0].StartIndex +1
+        , GL_UNSIGNED_INT, 0, m_ScreenQuad->MaterialGroups()[0].StartIndex);
+
+    //Iterate some times to make it more gaussian.
+    for (int i = 1; i < m_iterations; i++) {
+        //Vertical pass
+        m_GaussianFrameBuffer_vert.Bind();
+        m_GaussianProgram_vert->Bind();
+
+        glBindTexture(GL_TEXTURE_2D, m_GaussianTexture_horiz);
+
+        glBindVertexArray(m_ScreenQuad->VAO);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ScreenQuad->ElementBuffer);
+        glDrawElementsBaseVertex(GL_TRIANGLES, m_ScreenQuad->MaterialGroups()[0].EndIndex - m_ScreenQuad->MaterialGroups()[0].StartIndex +1
+            , GL_UNSIGNED_INT, 0, m_ScreenQuad->MaterialGroups()[0].StartIndex);
+
+        //horizontal pass
+
+        m_GaussianFrameBuffer_horiz.Bind();
+        m_GaussianProgram_horiz->Bind();
+
+        glBindTexture(GL_TEXTURE_2D, m_GaussianTexture_vert);
+
+        glBindVertexArray(m_ScreenQuad->VAO);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ScreenQuad->ElementBuffer);
+        glDrawElementsBaseVertex(GL_TRIANGLES, m_ScreenQuad->MaterialGroups()[0].EndIndex - m_ScreenQuad->MaterialGroups()[0].StartIndex +1
+            , GL_UNSIGNED_INT, 0, m_ScreenQuad->MaterialGroups()[0].StartIndex);
+    }
+
+    //final vertical gaussian after the iterations are done
+
+    m_GaussianFrameBuffer_vert.Bind();
+    m_GaussianProgram_vert->Bind();
+
+    glBindTexture(GL_TEXTURE_2D, m_GaussianTexture_horiz);
+
+    glBindVertexArray(m_ScreenQuad->VAO);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ScreenQuad->ElementBuffer);
+    glDrawElementsBaseVertex(GL_TRIANGLES, m_ScreenQuad->MaterialGroups()[0].EndIndex - m_ScreenQuad->MaterialGroups()[0].StartIndex +1
+        , GL_UNSIGNED_INT, 0, m_ScreenQuad->MaterialGroups()[0].StartIndex);
+
+    GLERROR("DrawBloomPass::Draw: END");
+}
+
+void DrawBloomPass::GenerateTexture(GLuint* texture, GLenum wrapping, GLenum filtering, glm::vec2 dimensions, GLint internalFormat, GLint format, GLenum type) const
+{
+    glGenTextures(1, texture);
+    glBindTexture(GL_TEXTURE_2D, *texture);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapping);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapping);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filtering);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filtering);
+    glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, dimensions.x, dimensions.y, 0, format, type, nullptr);//TODO: Renderer: Fix the precision and Resolution
+    GLERROR("Texture initialization failed");
+}