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#include "sceneRenderer.h"
#include <gfx/gl/shaders/fs-lightingShader.h>
#include <gfx/gl/shaders/vs-lightingShader.h>
SceneRenderer::SceneRenderer(glm::ivec2 size) : lighting {lightingShader_vs.compile(), lightingShader_fs.compile()}
{
glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
const auto configuregdata
= [size](const GLuint data, const GLint format, const GLenum type, const GLenum attachment) {
glBindTexture(GL_TEXTURE_2D, data);
glTexImage2D(GL_TEXTURE_2D, 0, format, size.x, size.y, 0, GL_RGBA, type, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, data, 0);
};
configuregdata(gPosition, GL_RGBA16F, GL_FLOAT, GL_COLOR_ATTACHMENT0);
configuregdata(gNormal, GL_RGBA16F, GL_FLOAT, GL_COLOR_ATTACHMENT1);
configuregdata(gAlbedoSpec, GL_RGBA, GL_UNSIGNED_BYTE, GL_COLOR_ATTACHMENT2);
static constexpr std::array<unsigned int, 3> attachments {
GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2};
glDrawBuffers(attachments.size(), attachments.data());
glBindRenderbuffer(GL_RENDERBUFFER, depth);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, size.x, size.y);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depth);
// finally check if framebuffer is complete
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
throw std::runtime_error("Framebuffer not complete!");
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
unsigned int quadVAO = 0;
unsigned int quadVBO;
void
renderQuad()
{
if (quadVAO == 0) {
float quadVertices[] = {
// positions // texture Coords
-1.0f,
1.0f,
0.0f,
0.0f,
1.0f,
-1.0f,
-1.0f,
0.0f,
0.0f,
0.0f,
1.0f,
1.0f,
0.0f,
1.0f,
1.0f,
1.0f,
-1.0f,
0.0f,
1.0f,
0.0f,
};
// setup plane VAO
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, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), nullptr);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), reinterpret_cast<void *>(3 * sizeof(float)));
}
glBindVertexArray(quadVAO);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindVertexArray(0);
}
void
SceneRenderer::render(std::function<void()> content) const
{
glEnable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
// Geometry pass
glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
content();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// Lighting pass
glDisable(GL_BLEND);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(lighting.m_program);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gPosition);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gNormal);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, gAlbedoSpec);
// TODO Configure lights
renderQuad();
}
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