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-rw-r--r--src/Framebuffer.cpp125
1 files changed, 125 insertions, 0 deletions
diff --git a/src/Framebuffer.cpp b/src/Framebuffer.cpp
new file mode 100644
index 0000000..7127a57
--- /dev/null
+++ b/src/Framebuffer.cpp
@@ -0,0 +1,125 @@
+#include "Framebuffer.hpp"
+#include "Shader.hpp"
+#include <string>
+#include "Utility.hpp"
+
+GLuint quadVao, quadVbo;
+Shader *quadShader = nullptr;
+
+Framebuffer::Framebuffer(unsigned int width, unsigned int height, bool createDepthStencilBuffer) : width(width), height(height) {
+ if (quadShader == nullptr) {
+ float quadVertices[] = {
+ // positions // texCoords
+ -1.0f, 1.0f, 0.0f, 1.0f,
+ -1.0f, -1.0f, 0.0f, 0.0f,
+ 1.0f, -1.0f, 1.0f, 0.0f,
+
+ -1.0f, 1.0f, 0.0f, 1.0f,
+ 1.0f, -1.0f, 1.0f, 0.0f,
+ 1.0f, 1.0f, 1.0f, 1.0f
+ };
+
+ glGenVertexArrays(1, &quadVao);
+ glGenBuffers(1, &quadVbo);
+ glBindVertexArray(quadVao);
+ glBindBuffer(GL_ARRAY_BUFFER, quadVbo);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
+ glEnableVertexAttribArray(0);
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
+ glEnableVertexAttribArray(1);
+ glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
+ quadShader = new Shader("./shaders/fbo.vs", "./shaders/fbo.fs");
+ quadShader->Use();
+ glUniform1i(glGetUniformLocation(quadShader->Program, "inputTexture"), 1);
+ glActiveTexture(GL_TEXTURE1);
+ glCheckError();
+ }
+
+ glGenTextures(1, &texColor);
+ glBindTexture(GL_TEXTURE_2D, texColor);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+ glCheckError();
+
+ if (createDepthStencilBuffer) {
+ glGenRenderbuffers(1, &rboDepthStencil);
+ glBindRenderbuffer(GL_RENDERBUFFER, rboDepthStencil);
+ glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
+ }
+
+ glGenFramebuffers(1, &fbo);
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texColor, 0);
+ if(createDepthStencilBuffer)
+ glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rboDepthStencil);
+ glCheckError();
+
+ GLenum framebufferStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+ if (framebufferStatus != GL_FRAMEBUFFER_COMPLETE)
+ throw std::runtime_error("Failed to initialize framebuffer: " + std::to_string(framebufferStatus));
+}
+
+Framebuffer::~Framebuffer() {
+ if (rboDepthStencil)
+ glDeleteRenderbuffers(1, &rboDepthStencil);
+ if (texColor)
+ glDeleteTextures(1, &texColor);
+
+ glDeleteFramebuffers(1, &fbo);
+}
+
+void Framebuffer::Activate() {
+ glViewport(0, 0, width, height);
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+}
+
+void Framebuffer::RenderTo(Framebuffer &target) {
+ glBindFramebuffer(GL_FRAMEBUFFER, target.fbo);
+ glViewport(0, 0, target.width, target.height);
+ glBindVertexArray(quadVao);
+ glUseProgram(quadShader->Program);
+ glBindTexture(GL_TEXTURE_2D, texColor);
+ glDrawArrays(GL_TRIANGLES, 0, 6);
+}
+
+void Framebuffer::Resize(unsigned int newWidth, unsigned int newHeight) {
+ width = newWidth;
+ height = newHeight;
+ if (texColor) {
+ glBindTexture(GL_TEXTURE_2D, texColor);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, newWidth, newHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
+ }
+ if (rboDepthStencil) {
+ glBindRenderbuffer(GL_RENDERBUFFER, rboDepthStencil);
+ glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
+ }
+}
+
+Framebuffer &Framebuffer::GetDefault()
+{
+ static char fboDefaultData[sizeof(Framebuffer)];
+ static Framebuffer *fboDefault = nullptr;
+ if (fboDefault == nullptr) {
+ fboDefault = reinterpret_cast<Framebuffer*>(fboDefaultData);
+ fboDefault->fbo = 0;
+ fboDefault->width = 1;
+ fboDefault->height = 1;
+ fboDefault->texColor = 0;
+ fboDefault->rboDepthStencil = 0;
+ }
+ return *fboDefault;
+}
+
+void Framebuffer::Clear(bool color, bool depth, bool stencil)
+{
+ Activate();
+ GLbitfield clearBits = 0;
+ if (color)
+ clearBits |= GL_COLOR_BUFFER_BIT;
+ if (depth)
+ clearBits |= GL_DEPTH_BUFFER_BIT;
+ if (stencil)
+ clearBits |= GL_STENCIL_BUFFER_BIT;
+ glClear(clearBits);
+}