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#include "sceneRenderer.h"
#include "maths.h"
#include "vertexArrayObject.h"
#include <gfx/gl/shaders/fs-directionalLight.h>
#include <gfx/gl/shaders/fs-lighting.h>
#include <gfx/gl/shaders/vs-lighting.h>
#include <glm/gtc/type_ptr.hpp>
static constexpr const std::array<const glm::i8vec4, 4> displayVAOdata {{
// positions(x,y) texture coords(z,w)
{-1, 1, 0, 1},
{-1, -1, 0, 0},
{1, 1, 1, 1},
{1, -1, 1, 0},
}};
SceneRenderer::SceneRenderer(ScreenAbsCoord s, GLuint o) :
camera {{-1250000, -1250000, 35.0F}, quarter_pi, ratio(s), 100, 10000000}, size {s}, output {o},
lighting {lighting_vs, lighting_fs}, shadowMapper {{2048, 2048}}
{
shader.setViewPort({0, 0, size.x, size.y});
VertexArrayObject {displayVAO}.addAttribs<glm::i8vec4>(displayVBO, displayVAOdata);
const auto configuregdata = [this](const GLuint data, const std::initializer_list<GLint> iformats,
const GLenum format, const GLenum attachment) {
glBindTexture(GL_TEXTURE_2D, data);
glTexParameter(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameter(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
for (const auto iformat : iformats) {
glTexImage2D(GL_TEXTURE_2D, 0, iformat, size.x, size.y, 0, format, GL_BYTE, nullptr);
glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, data, 0);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE) {
return iformat;
}
}
throw std::runtime_error("Framebuffer could not be completed!");
};
glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
configuregdata(gPosition, {GL_RGB32I}, GL_RGB_INTEGER, GL_COLOR_ATTACHMENT0);
configuregdata(gNormal, {GL_RGB8_SNORM, GL_RGB16F}, GL_RGB, GL_COLOR_ATTACHMENT1);
configuregdata(gAlbedoSpec, {GL_RGB8}, GL_RGB, GL_COLOR_ATTACHMENT2);
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);
glBindFramebuffer(GL_FRAMEBUFFER, gBufferIll);
configuregdata(gIllumination, {GL_RGB8}, GL_RGB, GL_COLOR_ATTACHMENT0);
glDrawBuffer(GL_COLOR_ATTACHMENT0);
glBindFramebuffer(GL_FRAMEBUFFER, output);
}
void
SceneRenderer::render(const SceneProvider & scene) const
{
shader.setViewProjection(camera.getPosition(), camera.getViewProjection());
glViewport(0, 0, size.x, size.y);
// Geometry/colour pass - writes albedo, normal and position textures
glBindFramebuffer(GL_FRAMEBUFFER, gBuffer);
glEnable(GL_BLEND);
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_DEPTH_TEST);
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
scene.content(shader);
// Environment pass -
// * ambient - clears illumination texture - see setAmbientLight
// * directional - updates shadowMapper, reads normal and position, writes illumination - see setDirectionalLight
scene.environment(shader, *this);
// Scene lights pass -
// * per light - reads normal and position, writes illumination
glBindFramebuffer(GL_FRAMEBUFFER, gBufferIll);
glBlendFunc(GL_ONE, GL_ONE);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gPosition);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gNormal);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D_ARRAY, shadowMapper);
glDisable(GL_DEPTH_TEST);
scene.lights(shader);
// Composition pass - reads albedo and illumination, writes output
glBindFramebuffer(GL_FRAMEBUFFER, output);
glViewport(0, 0, size.x, size.y);
glCullFace(GL_BACK);
glDisable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D, gAlbedoSpec);
glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_2D, gIllumination);
lighting.use();
renderQuad();
}
void
SceneRenderer::setAmbientLight(const RGB & colour) const
{
glBindFramebuffer(GL_FRAMEBUFFER, gBufferIll);
glClearColor(colour.r, colour.g, colour.b, 1.0F);
glClear(GL_COLOR_BUFFER_BIT);
}
void
SceneRenderer::setDirectionalLight(
const RGB & colour, const LightDirection & direction, const SceneProvider & scene) const
{
if (colour.r > 0 || colour.g > 0 || colour.b > 0) {
const auto lvp = shadowMapper.update(scene, direction, camera);
glBindFramebuffer(GL_FRAMEBUFFER, gBufferIll);
glBlendFunc(GL_ONE, GL_ONE);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, gPosition);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, gNormal);
glActiveTexture(GL_TEXTURE2);
glBindTexture(GL_TEXTURE_2D_ARRAY, shadowMapper);
glViewport(0, 0, size.x, size.y);
dirLight.use();
dirLight.setDirectionalLight(colour, direction.vector(), camera.getPosition(), lvp);
renderQuad();
}
}
void
SceneRenderer::renderQuad() const
{
glBindVertexArray(displayVAO);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glBindVertexArray(0);
}
SceneRenderer::DirectionalLightProgram::DirectionalLightProgram() : Program {lighting_vs, directionalLight_fs} { }
const auto toTextureSpaceMat = glm::translate(glm::identity<glm::mat4>(), glm::vec3 {0.5F})
* glm::scale(glm::identity<glm::mat4>(), glm::vec3 {0.5F});
void
SceneRenderer::DirectionalLightProgram::setDirectionalLight(
const RGB & c, const Direction3D & d, const GlobalPosition3D & p, const std::span<const glm::mat4x4> lvp) const
{
const auto toTextureSpace = [](const glm::mat4 & m) {
return toTextureSpaceMat * m;
};
glUniform(colourLoc, c);
glUniform(directionLoc, d);
glUniform(lightPointLoc, p);
glUniform(lightViewProjectionCountLoc, static_cast<GLuint>(lvp.size()));
glUniform(lightViewProjectionLoc, std::span<const glm::mat4> {lvp * toTextureSpace});
}
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