initial commit

2025-05-07 20:42:50 +03:00
parent 27b194816b
commit fc46b7c434
36 changed files with 754 additions and 70 deletions
@@ -0,0 +1,186 @@
+#include "GBuffer.hpp"
+
+#include <GL/glew.h>
+
+#include "debug/Logger.hpp"
+
+static debug::Logger logger("gl-gbuffer");
+
+void GBuffer::createColorBuffer() {
+    glGenTextures(1, &colorBuffer);
+    glBindTexture(GL_TEXTURE_2D, colorBuffer);
+    glTexImage2D(
+        GL_TEXTURE_2D,
+        0,
+        GL_RGB,
+        width,
+        height,
+        0,
+        GL_RGB,
+        GL_UNSIGNED_BYTE,
+        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_ATTACHMENT0, GL_TEXTURE_2D, colorBuffer, 0
+    );
+}
+
+void GBuffer::createPositionsBuffer() {
+    glGenTextures(1, &positionsBuffer);
+    glBindTexture(GL_TEXTURE_2D, positionsBuffer);
+    glTexImage2D(
+        GL_TEXTURE_2D,
+        0,
+        GL_RGBA16F,
+        width,
+        height,
+        0,
+        GL_RGBA,
+        GL_FLOAT,
+        nullptr
+    );
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glFramebufferTexture2D(
+        GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, positionsBuffer, 0
+    );
+}
+
+void GBuffer::createNormalsBuffer() {
+    glGenTextures(1, &normalsBuffer);
+    glBindTexture(GL_TEXTURE_2D, normalsBuffer);
+    glTexImage2D(
+        GL_TEXTURE_2D,
+        0,
+        GL_RGBA16F,
+        width,
+        height,
+        0,
+        GL_RGBA,
+        GL_FLOAT,
+        nullptr
+    );
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glFramebufferTexture2D(
+        GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_2D, normalsBuffer, 0
+    );
+}
+
+void GBuffer::createDepthBuffer() {
+    glGenRenderbuffers(1, &depthBuffer);
+    glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
+    glFramebufferRenderbuffer(
+        GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthBuffer
+    );
+}
+
+GBuffer::GBuffer(uint width, uint height) : width(width), height(height) {
+    glGenFramebuffers(1, &fbo);
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+    createColorBuffer();
+    createPositionsBuffer();
+    createNormalsBuffer();
+
+    GLenum attachments[3] = {
+        GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2
+    };
+    glDrawBuffers(3, attachments);
+
+    createDepthBuffer();
+
+    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+        logger.error() << "framebuffer is not complete!";
+    }
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+GBuffer::~GBuffer() {
+    glDeleteTextures(1, &colorBuffer);
+    glDeleteTextures(1, &positionsBuffer);
+    glDeleteTextures(1, &normalsBuffer);
+    glDeleteRenderbuffers(1, &depthBuffer);
+    glDeleteFramebuffers(1, &fbo);
+}
+
+void GBuffer::bind() {
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+}
+
+void GBuffer::unbind() {
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+void GBuffer::bindBuffers() {
+    glActiveTexture(GL_TEXTURE2);
+    glBindTexture(GL_TEXTURE_2D, normalsBuffer);
+
+    glActiveTexture(GL_TEXTURE1);
+    glBindTexture(GL_TEXTURE_2D, positionsBuffer);
+
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, colorBuffer);
+}
+
+void GBuffer::resize(uint width, uint height) {
+    if (this->width == width && this->height == height) {
+        return;
+    }
+    this->width = width;
+    this->height = height;
+
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+    glBindRenderbuffer(GL_RENDERBUFFER, depthBuffer);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
+    glBindRenderbuffer(GL_RENDERBUFFER, 0);
+
+    glBindTexture(GL_TEXTURE_2D, colorBuffer);
+    glTexImage2D(
+        GL_TEXTURE_2D,
+        0,
+        GL_RGB,
+        width,
+        height,
+        0,
+        GL_RGB,
+        GL_UNSIGNED_BYTE,
+        nullptr
+    );
+    glFramebufferTexture2D(
+        GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, colorBuffer, 0
+    );
+
+    glBindTexture(GL_TEXTURE_2D, positionsBuffer);
+    glTexImage2D(
+        GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, nullptr
+    );
+    glFramebufferTexture2D(
+        GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, GL_TEXTURE_2D, positionsBuffer, 0
+    );
+
+    glBindTexture(GL_TEXTURE_2D, normalsBuffer);
+    glTexImage2D(
+        GL_TEXTURE_2D, 0, GL_RGB16F, width, height, 0, GL_RGB, GL_FLOAT, nullptr
+    );
+    glFramebufferTexture2D(
+        GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT2, GL_TEXTURE_2D, normalsBuffer, 0
+    );
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+uint GBuffer::getWidth() const {
+    return width;
+}
+
+uint GBuffer::getHeight() const {
+    return height;
+}