SSAO is working, but is kinda crappy. You can change shade variables in the debug window.

2016-02-19 16:50:04 +01:00
parent 0d665c10fe
commit 201480b17f
16 changed files with 444 additions and 38 deletions
@@ -0,0 +1,135 @@
+#include "Rendering/SSAOPass.h"
+
+SSAOPass::SSAOPass(IRenderer* renderer)
+{
+	m_Renderer = renderer;
+
+	m_ScreenQuad = ResourceManager::Load<Model>("Models/Core/ScreenQuad.mesh");
+
+	InitializeBuffer();
+	InitializeShaderProgram();
+	Setting(0.1f, 0.012f, 1.0f);
+
+	m_DrawBloomPass = new DrawBloomPass(renderer);
+}
+
+void SSAOPass::InitializeShaderProgram()
+{
+	m_SSAOProgram = ResourceManager::Load<ShaderProgram>("##SSAOProgram");
+	m_SSAOProgram->AddShader(std::shared_ptr<Shader>(new VertexShader("Shaders/SSAO.vert.glsl")));
+	m_SSAOProgram->AddShader(std::shared_ptr<Shader>(new FragmentShader("Shaders/SSAO.frag.glsl")));
+	m_SSAOProgram->Compile();
+	m_SSAOProgram->Link();
+
+	m_SSAOViewSpaceZProgram = ResourceManager::Load<ShaderProgram>("##SSAOViewSpaceZProgram");
+	m_SSAOViewSpaceZProgram->AddShader(std::shared_ptr<Shader>(new VertexShader("Shaders/SSAO.vert.glsl")));
+	m_SSAOViewSpaceZProgram->AddShader(std::shared_ptr<Shader>(new FragmentShader("Shaders/SSAOViewSpaceZ.frag.glsl")));
+	m_SSAOViewSpaceZProgram->Compile();
+	m_SSAOViewSpaceZProgram->Link();
+}
+
+
+void SSAOPass::InitializeBuffer()
+{
+	GenerateTexture(&m_SSAOTexture, GL_CLAMP_TO_EDGE, GL_LINEAR, glm::vec2(m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height), GL_RGB16F, GL_RGB, GL_FLOAT);
+
+	m_SSAOFramBuffer.AddResource(std::shared_ptr<BufferResource>(new Texture2D(&m_SSAOTexture, GL_COLOR_ATTACHMENT0)));
+	m_SSAOFramBuffer.Generate();
+
+	GenerateTexture(&m_SSAOViewSpaceZTexture, GL_CLAMP_TO_EDGE, GL_LINEAR, glm::vec2(m_Renderer->GetViewportSize().Width, m_Renderer->GetViewportSize().Height), GL_RGB32F, GL_RGB, GL_FLOAT);
+
+	m_SSAOViewSpaceZFramBuffer.AddResource(std::shared_ptr<BufferResource>(new Texture2D(&m_SSAOViewSpaceZTexture, GL_COLOR_ATTACHMENT0)));
+	m_SSAOViewSpaceZFramBuffer.Generate();
+}
+
+void SSAOPass::ClearBuffer()
+{
+	m_SSAOFramBuffer.Bind();
+	glClearColor(0.f, 0.f, 0.f, 0.f);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	m_SSAOFramBuffer.Unbind();
+
+	m_SSAOViewSpaceZFramBuffer.Bind();
+	glClearColor(0.f, 0.f, 0.f, 0.f);
+	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+	m_SSAOViewSpaceZFramBuffer.Unbind();
+}
+
+void SSAOPass::Setting(float radius, float bias, float intensity) {
+	m_Radius = radius;
+	m_Bias = bias;
+	m_Intensity = intensity;
+}
+
+void SSAOPass::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);
+	GLERROR("Texture initialization failed");
+}
+
+void SSAOPass::Draw(GLuint depthBuffer, Camera* camera)
+{
+	SSAOPassState state;
+	GLuint viewSpaceZPShaderHandle = m_SSAOViewSpaceZProgram->GetHandle();
+	GLuint SSAOShaderHandle = m_SSAOProgram->GetHandle();
+
+	m_SSAOViewSpaceZFramBuffer.Bind();
+	m_SSAOViewSpaceZProgram->Bind();
+
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, depthBuffer);
+	glm::vec3 clipInfo = glm::vec3(
+		(camera->NearClip() * camera->FarClip()),
+		(camera->NearClip() - camera->FarClip()),
+		(camera->FarClip())
+		);
+	/*glm::vec3 clipInfo = glm::vec3(
+		(camera->NearClip()),
+		(-1.0f),
+		(+1.0f)
+		);*/
+	glUniform3fv(glGetUniformLocation(viewSpaceZPShaderHandle, "ClipInfo"), 1, glm::value_ptr(clipInfo));
+
+	glBindVertexArray(m_ScreenQuad->VAO);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_ScreenQuad->ElementBuffer);
+	glDrawElementsBaseVertex(GL_TRIANGLES, m_ScreenQuad->MaterialGroups()[0].material->EndIndex - m_ScreenQuad->MaterialGroups()[0].material->StartIndex + 1
+		, GL_UNSIGNED_INT, 0, m_ScreenQuad->MaterialGroups()[0].material->StartIndex);
+	
+	glm::vec4 projInfo = glm::vec4(
+		(-2.0f / (m_Renderer->GetViewportSize().Width * camera->ProjectionMatrix()[0][0])),
+		(-2.0f / (m_Renderer->GetViewportSize().Height * camera->ProjectionMatrix()[1][1])),
+		((1.0f - camera->ProjectionMatrix()[0][2]) / camera->ProjectionMatrix()[0][0]),
+		((1.0f - camera->ProjectionMatrix()[1][2]) / camera->ProjectionMatrix()[1][1])
+		);
+
+
+	m_SSAOFramBuffer.Bind();
+	m_SSAOProgram->Bind();
+
+	glActiveTexture(GL_TEXTURE0);
+	glBindTexture(GL_TEXTURE_2D, m_SSAOViewSpaceZTexture);
+
+	// How many pixel there are in a 1m long object 1m away from the camera
+	glUniform1f(glGetUniformLocation(SSAOShaderHandle, "ProjScale"), m_Renderer->GetViewportSize().Height / (-2.0f * glm::tan(camera->FOV() * 0.5f)));
+
+	glUniform1f(glGetUniformLocation(SSAOShaderHandle, "Radius"), m_Radius);
+	glUniform1f(glGetUniformLocation(SSAOShaderHandle, "Bias"), m_Bias);
+	glUniform1f(glGetUniformLocation(SSAOShaderHandle, "IntensityDivR6"), m_Intensity / glm::pow(m_Radius, 6));
+
+	glUniform4fv(glGetUniformLocation(SSAOShaderHandle, "ProjInfo"), 1, glm::value_ptr(projInfo));
+	glDrawElementsBaseVertex(GL_TRIANGLES, m_ScreenQuad->MaterialGroups()[0].material->EndIndex - m_ScreenQuad->MaterialGroups()[0].material->StartIndex + 1
+		, GL_UNSIGNED_INT, 0, m_ScreenQuad->MaterialGroups()[0].material->StartIndex);
+
+	m_DrawBloomPass->ClearBuffer();
+	m_DrawBloomPass->Draw(m_SSAOTexture);
+}
+
+void ComputeAO(GLuint depthBuffer, Camera* camera) {
+
+}