81 lines
2.7 KiB
C++
81 lines
2.7 KiB
C++
#pragma once
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#include <assert.h>
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#include "glad/gl.h"
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#include "window.h"
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template <int render_target_count>
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struct geometry_buffer {
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unsigned int framebuffer;
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unsigned int target[render_target_count]; // textures
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unsigned int renderbuffer;
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int initialized;
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int width;
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int height;
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};
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struct target_type {
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GLint internal_format;
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GLenum attachment;
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};
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struct target_name {
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enum {
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POSITION = 0,
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NORMAL = 1,
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COLOR = 2,
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BLOCK = 3,
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};
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};
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template <int render_target_count>
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void init_geometry_buffer(geometry_buffer<render_target_count>& geometry_buffer, target_type const * const types)
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{
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int width = window::width;
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int height = window::height;
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if ((geometry_buffer.initialized == 1) && (width == geometry_buffer.width) && (height == geometry_buffer.height)) {
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return;
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}
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if (geometry_buffer.initialized) {
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glDeleteFramebuffers(1, &geometry_buffer.framebuffer);
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glDeleteTextures(render_target_count, geometry_buffer.target);
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glDeleteRenderbuffers(1, &geometry_buffer.renderbuffer);
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}
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glGenFramebuffers(1, &geometry_buffer.framebuffer);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, geometry_buffer.framebuffer);
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glGenTextures(render_target_count, geometry_buffer.target);
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for (int i = 0; i < render_target_count; i++) {
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glBindTexture(GL_TEXTURE_2D, geometry_buffer.target[i]);
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glTexImage2D(GL_TEXTURE_2D, 0, types[i].internal_format, width, height, 0, GL_RGBA, GL_FLOAT, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, types[i].attachment, GL_TEXTURE_2D, geometry_buffer.target[i], 0);
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}
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static_assert(render_target_count <= 8);
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static GLenum const attachments[8] = {
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GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3,
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GL_COLOR_ATTACHMENT4, GL_COLOR_ATTACHMENT5, GL_COLOR_ATTACHMENT6, GL_COLOR_ATTACHMENT7,
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};
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glDrawBuffers(render_target_count, attachments); // bound to GL_DRAW_FRAMEBUFFER
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glGenRenderbuffers(1, &geometry_buffer.renderbuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, geometry_buffer.renderbuffer);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, width, height);
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glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, geometry_buffer.renderbuffer);
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assert(glCheckFramebufferStatus(GL_DRAW_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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geometry_buffer.initialized = 1;
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geometry_buffer.width = width;
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geometry_buffer.height = height;
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}
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