LightcullingPass for forward+ is now separate from Renderer.cpp.

2015-12-18 14:31:16 +01:00
parent ab6af30a28
commit 069a6756b9
6 changed files with 177 additions and 155 deletions
@@ -0,0 +1,107 @@
+#include "Rendering/LightCullingPass.h"
+
+LightCullingPass::LightCullingPass(IRenderer* renderer)
+{
+    m_Renderer = renderer;
+    TEMPCreateLights();
+    InitializeSSBOs();
+    InitializeShaderPrograms();
+    GenerateNewFrustum();
+}
+
+LightCullingPass::~LightCullingPass()
+{
+
+}
+
+void LightCullingPass::GenerateNewFrustum()
+{
+    GLERROR("CalculateFrustum Error: Pre");
+
+    m_CalculateFrustumProgram->Bind();
+
+    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, m_FrustumSSBO);
+    glUniformMatrix4fv(glGetUniformLocation(m_CalculateFrustumProgram->GetHandle(), "P"), 1, false, glm::value_ptr(m_Renderer->Camera()->ProjectionMatrix()));
+    glUniform2f(glGetUniformLocation(m_CalculateFrustumProgram->GetHandle(), "ScreenDimensions"), m_Renderer->Resolution().Width, m_Renderer->Resolution().Height);
+    glDispatchCompute(5, 3, 1); //TODO: Renderer: This needs change so resolution will be right.
+
+    GLERROR("CalculateFrustum Error: End");
+}
+
+void LightCullingPass::CullLights()
+{
+    GLERROR("CullLights Error: Pre");
+    m_LightOffset = 0;
+
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, m_LightOffsetSSBO);
+    glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(m_LightOffset), &m_LightOffset, GL_DYNAMIC_COPY);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+
+    m_LightCullProgram->Bind();
+    glUniformMatrix4fv(glGetUniformLocation(m_LightCullProgram->GetHandle(), "V"), 1, false, glm::value_ptr(m_Renderer->Camera()->ViewMatrix()));
+    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, m_FrustumSSBO);
+    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, m_LightSSBO);
+    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 2, m_LightGridSSBO);
+    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 3, m_LightOffsetSSBO);
+    glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 4, m_LightIndexSSBO);
+    glDispatchCompute(m_Renderer->Resolution().Width / TILE_SIZE, m_Renderer->Resolution().Height / TILE_SIZE, 1);
+
+    GLERROR("CullLights Error: End");
+}
+
+void LightCullingPass::InitializeSSBOs()
+{
+    glGenBuffers(1, &m_FrustumSSBO);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, m_FrustumSSBO);
+    glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(m_Frustums), &m_Frustums, GL_DYNAMIC_COPY);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+    GLERROR("m_FrustumSSBO");
+
+    glGenBuffers(1, &m_LightSSBO);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, m_LightSSBO);
+    glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(m_PointLights), &m_PointLights, GL_DYNAMIC_COPY);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+    GLERROR("m_LightSSBO");
+
+    glGenBuffers(1, &m_LightGridSSBO);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, m_LightGridSSBO);
+    glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(m_LightGrid), &m_LightGrid, GL_DYNAMIC_COPY);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+    GLERROR("m_LightGridSSBO");
+
+
+    glGenBuffers(1, &m_LightOffsetSSBO);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, m_LightOffsetSSBO);
+    glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(m_LightOffset), &m_LightOffset, GL_DYNAMIC_COPY);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+    GLERROR("m_LightOffsetSSBO");
+
+    glGenBuffers(1, &m_LightIndexSSBO);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, m_LightIndexSSBO);
+    glBufferData(GL_SHADER_STORAGE_BUFFER, sizeof(m_LightIndex), &m_LightIndex, GL_DYNAMIC_COPY);
+    glBindBuffer(GL_SHADER_STORAGE_BUFFER, 0);
+    GLERROR("m_LightIndexSSBO");
+}
+
+void LightCullingPass::InitializeShaderPrograms()
+{
+    m_CalculateFrustumProgram = ResourceManager::Load<ShaderProgram>("#CalculateFrustumProgram");
+    m_CalculateFrustumProgram->AddShader(std::shared_ptr<Shader>(new ComputeShader("Shaders/GridFrustum.comp.glsl")));
+    m_CalculateFrustumProgram->Compile();
+    m_CalculateFrustumProgram->Link();
+
+    m_LightCullProgram = ResourceManager::Load<ShaderProgram>("#LightCullProgram");
+    m_LightCullProgram->AddShader(std::shared_ptr<Shader>(new ComputeShader("Shaders/cullLights.comp.glsl")));
+    m_LightCullProgram->Compile();
+    m_LightCullProgram->Link();
+}
+
+void LightCullingPass::TEMPCreateLights()
+{
+    for (int i = 0; i < NUM_LIGHTS; i++) {
+        glm::vec3 pos = glm::vec3(cos(i) * i/10.f, 0.5f, sin(i) * i/10.f);
+        m_PointLights[i].Position = glm::vec4(pos, 1.f);
+        m_PointLights[i].Color = glm::vec4(rand()%255 / 255.f, rand()%255 / 255.f, rand()%255 / 255.f, 1.f);
+        m_PointLights[i].Radius = glm::length(pos) / 5.f;
+    }
+}