+template <std::size_t N>
+GLuint setupVertices(GLuint progId, std::array<glm::vec3, N> vertices, bool reverse = false);
+
+// matrices used when capturing various environment maps
+glm::mat4 captureProj = glm::perspective(glm::radians(90.f), 1.f, 0.1f, 10.f);
+glm::mat4 captureViews[] = {
+ glm::lookAt(glm::vec3(0, 0, 0), glm::vec3( 1, 0, 0), glm::vec3(0, -1, 0)),
+ glm::lookAt(glm::vec3(0, 0, 0), glm::vec3(-1, 0, 0), glm::vec3(0, -1, 0)),
+ glm::lookAt(glm::vec3(0, 0, 0), glm::vec3( 0, 1, 0), glm::vec3(0, 0, 1)),
+ glm::lookAt(glm::vec3(0, 0, 0), glm::vec3( 0, -1, 0), glm::vec3(0, 0, -1)),
+ glm::lookAt(glm::vec3(0, 0, 0), glm::vec3( 0, 0, 1), glm::vec3(0, -1, 0)),
+ glm::lookAt(glm::vec3(0, 0, 0), glm::vec3( 0, 0, -1), glm::vec3(0, -1, 0))
+};
+
+void Skybox::generatePrefilterMap() const {
+ glBindTexture(GL_TEXTURE_CUBE_MAP, prefilterTexId);
+ for (GLuint i = 0; i < 6; i++)
+ glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0 , GL_RGB16F, 128, 128, 0, GL_RGB, GL_FLOAT, nullptr);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+ glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+ glGenerateMipmap(GL_TEXTURE_CUBE_MAP);