142 lines
3.9 KiB
C++
142 lines
3.9 KiB
C++
#include "Skybox.h"
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#include "imgui/stb_image.h"
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Skybox::Skybox()
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{
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float side = 50.0f; //size of cube
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float side2 = side / 2.0f;
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float v[24 * 3] = {
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// Front
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-side2, -side2, side2,
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side2, -side2, side2,
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side2, side2, side2,
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-side2, side2, side2,
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// Right
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side2, -side2, side2,
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side2, -side2, -side2,
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side2, side2, -side2,
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side2, side2, side2,
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// Back
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-side2, -side2, -side2,
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-side2, side2, -side2,
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side2, side2, -side2,
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side2, -side2, -side2,
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// Left
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-side2, -side2, side2, //12
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-side2, side2, side2, //13
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-side2, side2, -side2, //14
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-side2, -side2, -side2, //15
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// Bottom
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-side2, -side2, side2,
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-side2, -side2, -side2,
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side2, -side2, -side2,
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side2, -side2, side2,
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// Top
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-side2, side2, side2,
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side2, side2, side2,
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side2, side2, -side2,
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-side2, side2, -side2
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};
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GLuint el[] = {
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0,2,1, 0,3,2, 4,6,5, 4,7,6,
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8,10,9, 8,11,10, 12,14,13, 12,15,14,
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16,18,17, 16,19,18, 20,22,21, 20,23,22
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};
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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glGenBuffers(1, &vector_vbo);
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glBindBuffer(GL_ARRAY_BUFFER, vector_vbo);
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glBufferData(GL_ARRAY_BUFFER, 24 * 3 * sizeof(GLfloat), v, GL_STATIC_DRAW);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(GLfloat) * 3, NULL);
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glEnableVertexAttribArray(0);
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glGenBuffers(1, &ibo);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, 36 * sizeof(GLuint), el, GL_STATIC_DRAW);
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glVertexAttribPointer(4, 3, GL_FLOAT, GL_FALSE, 0, NULL);
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glEnableVertexAttribArray(4);
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}
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void Skybox::initialize(std::string skybox_dir, Shader *sky)
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{
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glActiveTexture(GL_TEXTURE0);
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glGenTextures(1, &texID); //set the texID as a member variable
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glBindTexture(GL_TEXTURE_CUBE_MAP, texID);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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const char * suffixes[] = { "left", "right", "top", "down", "back", "front"};
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GLuint targets[] = {
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GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
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GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
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GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z
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};
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for (int i = 0; i < 6; i++) {
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int channel, width, height;
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unsigned char *image;
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std::string filename;
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filename = std::string(skybox_dir + suffixes[i]) + std::string(".JPG");
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image = stbi_load(filename.c_str(), &width, &height, &channel, 0);
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glTexImage2D(targets[i], 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
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glGenerateMipmap(GL_TEXTURE_2D);
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stbi_image_free(image);
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}
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glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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sky->enable();
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sky->addUniform("DrawSkyBox", (int)GL_FALSE);
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sky->addUniform("CubeMapTex", (int)0);
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sky->disable();
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}
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Skybox::~Skybox()
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{
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glDeleteBuffers(1, &vector_vbo);
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glDeleteBuffers(1, &ibo);
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glDeleteVertexArrays(1, &vao);
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}
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// //Things to add
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// //Per model :
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// // - ModelMatrix
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// // - MaterialColor
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void Skybox::draw(Shader *sky_shader, SceneContext &ctx)
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{
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sky_shader->enable();
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glEnable(GL_CULL_FACE);
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glCullFace(GL_BACK);
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glm::mat4x4 modelMatrix = glm::scale(glm::mat4(1.0f), glm::vec3(scale));
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glm::mat4x4 mvpMatrix = ctx.projectionMatrix * ctx.viewMatrix * modelMatrix;
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sky_shader->addUniform("mvp", mvpMatrix);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_CUBE_MAP, texID);
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glBindVertexArray(vao);
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sky_shader->addUniform("DrawSkyBox", (int)GL_TRUE);
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int size;
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glGetBufferParameteriv(GL_ELEMENT_ARRAY_BUFFER, GL_BUFFER_SIZE, &size);
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glDrawElements(GL_TRIANGLES, size / sizeof(GLuint), GL_UNSIGNED_INT, 0);
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sky_shader->addUniform("DrawSkyBox", (int)GL_FALSE);
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glBindVertexArray(0);
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glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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glDisable(GL_CULL_FACE);
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sky_shader->disable();
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}
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