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