add emission gbuffer attachment

src/graphics/core/GBuffer.cpp

@@ -8,6 +8,8 @@ using namespace advanced_pipeline;
 
 static debug::Logger logger("gl-gbuffer");
 
+// TODO: REFACTOR
+
 void GBuffer::createColorBuffer() {
     glGenTextures(1, &colorBuffer);
     glBindTexture(GL_TEXTURE_2D, colorBuffer);
@@ -64,7 +66,7 @@ void GBuffer::createNormalsBuffer() {
         width,
         height,
         0,
-        GL_RGBA,
+        GL_RGB,
         GL_FLOAT,
         nullptr
     );
@@ -77,6 +79,29 @@ void GBuffer::createNormalsBuffer() {
     );
 }
 
+void GBuffer::createEmissionBuffer() {
+    glGenTextures(1, &emissionBuffer);
+    glBindTexture(GL_TEXTURE_2D, emissionBuffer);
+    glTexImage2D(
+        GL_TEXTURE_2D,
+        0,
+        GL_R8,
+        width,
+        height,
+        0,
+        GL_RED,
+        GL_FLOAT,
+        nullptr
+    );
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+    glFramebufferTexture2D(
+        GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT3, GL_TEXTURE_2D, emissionBuffer, 0
+    );
+}
+
 void GBuffer::createDepthBuffer() {
     glGenRenderbuffers(1, &depthBuffer);
     glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);
@@ -113,16 +138,21 @@ GBuffer::GBuffer(uint width, uint height) : width(width), height(height) {
     createColorBuffer();
     createPositionsBuffer();
     createNormalsBuffer();
+    createEmissionBuffer();
 
-    GLenum attachments[3] = {
-        GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2
+    GLenum attachments[4] = {
+        GL_COLOR_ATTACHMENT0,
+        GL_COLOR_ATTACHMENT1,
+        GL_COLOR_ATTACHMENT2,
+        GL_COLOR_ATTACHMENT3,
     };
-    glDrawBuffers(3, attachments);
+    glDrawBuffers(4, attachments);
 
     createDepthBuffer();
 
-    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
-        logger.error() << "gbuffer is not complete!";
+    int status;
+    if ((status = glCheckFramebufferStatus(GL_FRAMEBUFFER)) != GL_FRAMEBUFFER_COMPLETE) {
+        logger.error() << "gbuffer is not complete! (" << status << ")";
     }
     glBindFramebuffer(GL_FRAMEBUFFER, 0);
 
@@ -134,8 +164,10 @@ GBuffer::GBuffer(uint width, uint height) : width(width), height(height) {
     );
     GLenum ssaoAttachments[1] = {GL_COLOR_ATTACHMENT0};
     glDrawBuffers(1, ssaoAttachments);
-    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
-        logger.error() << "SSAO framebuffer is not complete!";
+
+
+    if ((status = glCheckFramebufferStatus(GL_FRAMEBUFFER)) != GL_FRAMEBUFFER_COMPLETE) {
+        logger.error() << "SSAO framebuffer is not complete! (" << status << ")";
     }
     glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }
@@ -144,6 +176,7 @@ GBuffer::~GBuffer() {
     glDeleteTextures(1, &colorBuffer);
     glDeleteTextures(1, &positionsBuffer);
     glDeleteTextures(1, &normalsBuffer);
+    glDeleteTextures(1, &emissionBuffer);
     glDeleteTextures(1, &ssaoBuffer);
     glDeleteRenderbuffers(1, &depthBuffer);
     glDeleteFramebuffers(1, &fbo);
@@ -164,6 +197,9 @@ void GBuffer::unbind() {
 }
 
 void GBuffer::bindBuffers() const {
+    glActiveTexture(GL_TEXTURE0 + TARGET_EMISSION);
+    glBindTexture(GL_TEXTURE_2D, emissionBuffer);
+
     glActiveTexture(GL_TEXTURE0 + TARGET_NORMALS);
     glBindTexture(GL_TEXTURE_2D, normalsBuffer);
 
@@ -227,12 +263,20 @@ void GBuffer::resize(uint width, uint height) {
 
     glBindTexture(GL_TEXTURE_2D, normalsBuffer);
     glTexImage2D(
-        GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, nullptr
+        GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGBA, GL_FLOAT, nullptr
     );
     glFramebufferTexture2D(
         GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_2D, normalsBuffer, 0
     );
 
+    glBindTexture(GL_TEXTURE_2D, emissionBuffer);
+    glTexImage2D(
+        GL_TEXTURE_2D, 0, GL_INTENSITY, width, height, 0, GL_LUMINANCE, GL_FLOAT, nullptr
+    );
+    glFramebufferTexture2D(
+        GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT3, GL_TEXTURE_2D, emissionBuffer, 0
+    );
+
     glBindTexture(GL_TEXTURE_2D, 0);
     glBindFramebuffer(GL_FRAMEBUFFER, 0);
 

src/graphics/core/GBuffer.hpp

@@ -32,6 +32,7 @@ private:
     uint colorBuffer;
     uint positionsBuffer;
     uint normalsBuffer;
+    uint emissionBuffer;
     uint depthBuffer;
     uint ssaoFbo;
     uint ssaoBuffer;
@@ -39,6 +40,7 @@ private:
     void createColorBuffer();
     void createPositionsBuffer();
     void createNormalsBuffer();
+    void createEmissionBuffer();
     void createDepthBuffer();
     void createSSAOBuffer();
 };

src/graphics/core/PostProcessing.cpp

@@ -102,6 +102,7 @@ void PostProcessing::configureEffect(
     if (gbuffer) {
         shader.uniform1i("u_position", TARGET_POSITIONS);
         shader.uniform1i("u_normal", TARGET_NORMALS);
+        shader.uniform1i("u_emission", TARGET_EMISSION);
     }
     shader.uniform1i("u_noise", TARGET_SSAO); // used in SSAO pass
     shader.uniform1i("u_ssao", TARGET_SSAO);

src/graphics/core/commons.hpp

@@ -55,9 +55,10 @@ namespace advanced_pipeline {
     inline constexpr int TARGET_SKYBOX = 1;
     inline constexpr int TARGET_POSITIONS = 2;
     inline constexpr int TARGET_NORMALS = 3;
-    inline constexpr int TARGET_SSAO = 4;
-    inline constexpr int TARGET_SHADOWS0 = 5;
-    inline constexpr int TARGET_SHADOWS1 = 6;
+    inline constexpr int TARGET_EMISSION = 4;
+    inline constexpr int TARGET_SSAO = 5;
+    inline constexpr int TARGET_SHADOWS0 = 6;
+    inline constexpr int TARGET_SHADOWS1 = 7;
 }
 
 VC_ENUM_METADATA(CursorShape)