Added glm, fbo, shader, texture and texture generator

src/fbo.cpp

@@ -0,0 +1,73 @@
+#include "fbo.h"
+
+#include <memory>
+
+BEGIN_NAMESPACE
+
+fbo::fbo(int w, int h)
+        : width(w),
+          height(h) {
+
+    glGenFramebuffers(1, &frame_buffer_id);
+    glGenTextures(1, &color_buffer_id);
+    glGenRenderbuffers(1, &depth_buffer_id);
+
+    glBindFramebuffer(GL_FRAMEBUFFER, frame_buffer_id);
+
+    glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, color_buffer_id);
+    glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE,
+                            4, // number of samples for multisampling
+                            GL_RGBA8,
+                            width, height,
+                            false);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, color_buffer_id,
+                           0);
+
+    glBindRenderbuffer(GL_RENDERBUFFER, depth_buffer_id);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, width, height);
+    glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depth_buffer_id);
+}
+
+int fbo::get_width() const {
+    return width;
+}
+
+int fbo::get_height() const {
+    return height;
+}
+
+GLuint fbo::get_color_buffer_id() const {
+    return color_buffer_id;
+}
+
+GLuint fbo::get_depth_buffer_id() const {
+    return depth_buffer_id;
+}
+
+void fbo::use() {
+    old_width = SCREEN_WIDTH;
+    old_height = SCREEN_HEIGHT;
+
+    SCREEN_WIDTH = width;
+    SCREEN_HEIGHT = height;
+
+    glBindFramebuffer(GL_FRAMEBUFFER, frame_buffer_id);
+    glViewport(0, 0, width, height);
+}
+
+void fbo::unuse() {
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glViewport(0, 0, old_width, old_height);
+
+    SCREEN_WIDTH = old_width;
+    SCREEN_HEIGHT = old_height;
+}
+
+std::shared_ptr<texture> fbo::get_texture() {
+    return std::make_shared<texture>(color_buffer_id, width, height);
+}
+
+END_NAMESPACE