95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
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#include "Skybox.h"
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cfloat vertices[] = {
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// positions
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, -1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, 1.0f, 1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, -1.0f, 1.0f,
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-1.0f, -1.0f, 1.0f,
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-1.0f, 1.0f, -1.0f,
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1.0f, 1.0f, -1.0f,
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1.0f, 1.0f, 1.0f,
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1.0f, 1.0f, 1.0f,
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-1.0f, 1.0f, 1.0f,
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-1.0f, 1.0f, -1.0f,
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-1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, -1.0f,
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1.0f, -1.0f, -1.0f,
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-1.0f, -1.0f, 1.0f,
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1.0f, -1.0f, 1.0f
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};
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Skybox::Skybox() {
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glGenVertexArrays(1, &cube);
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glBindVertexArray(cube);
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Id vbo;
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glGenBuffers(1, &vbo);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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// We're just going to use position data
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// UV data is the same
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * (sizeof(cfloat)), (void*) 0);
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glBindVertexArray(0);
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}
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Name Skybox::GetType() const { return "Skybox"; }
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Skybox *Skybox::FromFiles(const char *right, const char* left, const char* top, const char* bottom, const char* front, const char* back) {
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// HOCUS: https://learnopengl.com/Advanced-OpenGL/Cubemaps
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Skybox *sb = new Skybox();
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glGenTextures(1, &sb->id);
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glBindTexture(GL_TEXTURE_CUBE_MAP, sb->id);
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int width, height, nrChannels;
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unsigned char* data;
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const char* files[] = {right, left, top, bottom, front, back};
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for (int i = 0; i < 6; i++) {
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data = stbi_load(files[i], &width, &height, &nrChannels, 3);
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glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i,
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0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
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stbi_image_free(data);
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}
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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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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return sb;
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}
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void Skybox::DrawSkybox() {
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glBindVertexArray(cube);
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glDrawArrays(GL_TRIANGLES, 0, 36);
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glBindVertexArray(0);
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}
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