80 lines
2.6 KiB
C++
80 lines
2.6 KiB
C++
#pragma once
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#include "Gedeng/Mesh.h"
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#include "Gedeng/Shader.h"
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#include <glm/glm.hpp>
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namespace Gedeng {
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class DirectionalLight {
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public:
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glm::vec3 direction;
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explicit DirectionalLight(glm::vec3 direction)
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// TODO: Avoid all this duplication
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: direction(direction), shadow_shader(Gedeng::Shader("Shader/shadow.vs", "Shader/shadow.fs")) {
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// Configure depth map
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glGenFramebuffers(1, &depth_map_fbo);
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// Create depth texture
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glGenTextures(1, &depth_map);
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glBindTexture(GL_TEXTURE_2D, depth_map);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RG32F, SHADOW_WIDTH, SHADOW_HEIGHT, 0, GL_RGB, GL_FLOAT, NULL);
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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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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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// Attach depth texture as FBO's depth buffer
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glBindFramebuffer(GL_FRAMEBUFFER, depth_map_fbo);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, depth_map, 0);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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void set_in_shader(Shader &shader) {
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shader.setVec3("light_direction", direction);
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shader.setMat4("light_space_matrix", get_light_space_matrix());
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}
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void render_shadow(Mesh &mesh) {
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shadow_shader.use();
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shadow_shader.setMat4("lightSpaceMatrix", get_light_space_matrix());
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glViewport(0, 0, SHADOW_WIDTH, SHADOW_HEIGHT);
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glBindFramebuffer(GL_FRAMEBUFFER, depth_map_fbo);
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mesh.render(shadow_shader);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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glm::mat4 get_light_space_matrix() {
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// TODO: Make the values here configurable
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float near_plane = 1.0f, far_plane = 100.0f;
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glm::mat4 lightProjection = glm::ortho(-20.0f, 20.0f, -20.0f, 20.0f, near_plane, far_plane);
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glm::mat4 lightView = glm::lookAt(-direction * 10.0f, direction, glm::vec3(0.0, 1.0, 0.0));
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return lightProjection * lightView;
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}
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void clear_shadows() {
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shadow_shader.use();
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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void bind_depth_map_to(int unit) {
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glActiveTexture(GL_TEXTURE0 + unit);
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glBindTexture(GL_TEXTURE_2D, depth_map);
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}
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private:
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unsigned int depth_map;
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unsigned int depth_map_fbo;
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const unsigned int SHADOW_WIDTH = 2048;
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const unsigned int SHADOW_HEIGHT = 2048;
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Gedeng::Shader shadow_shader;
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};
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} // namespace Gedeng
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