{"id":9148,"date":"2023-01-29T23:08:35","date_gmt":"2023-01-29T14:08:35","guid":{"rendered":"https:\/\/minnano.app\/support\/?p=9148"},"modified":"2023-01-29T23:24:34","modified_gmt":"2023-01-29T14:24:34","slug":"env_pri_cat_29","status":"publish","type":"post","link":"https:\/\/minnano.app\/support\/2023\/01\/29\/env_pri_cat_29\/","title":{"rendered":"\u30b2\u30fc\u30e0\u5236\u4f5c \u74b0\u5883\u539f\u732b 29\u65e5\u76ee"},"content":{"rendered":"\n

\u6628\u65e5<\/a>\u306f\u6c34\u5206\u5b50<\/a>\u3092\u3001\u753b\u50cf\u3092\u4f7f\u308f\u305a\u306b\u30b7\u30a7\u30fc\u30c0\u306e\u307f\u3067\u63cf\u753b\u3059\u308b\u3088\u3046\u306b\u5909\u66f4\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u4eca\u65e5\u306f\u6c34\u5206\u5b50\u3092\u3001\u7a7a\u6c17\u4e2d\u3092\u98db\u3073\u56de\u3063\u3066\u3044\u308b\u30a4\u30e1\u30fc\u30b8\u3067\u30b0\u30ea\u30b0\u30ea\u52d5\u304b\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n

\u30b3\u30fc\u30c9\u306e\u5909\u66f4\u7b87\u6240\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n

let mut vertices: Vec<f32> = Vec::with_capacity(POINTS * 3);\nlet mut vertices_speed: Vec<f32> = Vec::with_capacity(POINTS * 2);<\/mark><\/strong>\nlet mut rng = rand::thread_rng();\nfor _i in 0..POINTS {\n    vertices.push(rng.gen_range(-1.0..1.0));    \/\/ x\n    vertices.push(rng.gen_range(-1.0..1.0));    \/\/ y\n    vertices.push(0.0);                         \/\/ z\n    vertices_speed.push(rng.gen_range(-0.01..0.01));    \/\/ speed x\n    vertices_speed.push(rng.gen_range(-0.01..0.01));    \/\/ speed y<\/mark><\/strong>\n}<\/code><\/pre>\n\n\n\n
\/\/ move points\nfor i in 0..POINTS {\n    let base_pos = i * 3;\n    let base_speed = i * 2;\n    \/\/ x\u65b9\u5411\n    if 1.0 < vertices[base_pos + 0] || vertices[base_pos + 0] < -1.0 {\n        vertices_speed[base_speed + 0] *= -1.0;\n    }\n    vertices[base_pos + 0] += vertices_speed[base_speed + 0];\n    \/\/ y\u65b9\u5411\n    if 1.0 < vertices[base_pos + 1] || vertices[base_pos + 1] < -1.0 {\n        vertices_speed[base_speed + 1] *= -1.0;\n    }\n    vertices[base_pos + 1] += vertices_speed[base_speed + 1];\n}\nunsafe {\n    gl::BindBuffer(gl::ARRAY_BUFFER, vbo);\n    gl::BufferData(\n        gl::ARRAY_BUFFER,                                                       \/\/ target\n        (vertices.len() * std::mem::size_of::<f32>()) as gl::types::GLsizeiptr, \/\/ size of data in bytes\n        vertices.as_ptr() as *const gl::types::GLvoid, \/\/ pointer to data\n        gl::STREAM_DRAW,                               \/\/ usage\n    );\n    gl::BindBuffer(gl::ARRAY_BUFFER, 0);\n} <\/mark><\/strong>\n\/\/ draw points\nunsafe {\n    gl::BindVertexArray(vao);\n    gl::DrawArrays(\n        gl::POINTS,     \/\/ mode\n        0,              \/\/ starting index in the enabled arrays\n        POINTS as i32,  \/\/ number of indices to be rendered\n    );\n}<\/code><\/pre>\n\n\n\n
unsafe {\n    gl::BindBuffer(gl::ARRAY_BUFFER, vbo);\n    gl::BufferData(\n        gl::ARRAY_BUFFER,                                                       \/\/ target\n        (vertices.len() * std::mem::size_of::<f32>()) as gl::types::GLsizeiptr, \/\/ size of data in bytes\n        vertices.as_ptr() as *const gl::types::GLvoid, \/\/ pointer to data\n        gl::STREAM_DRAW<\/strong><\/mark>,                               \/\/ usage\n    );\n    gl::BindBuffer(gl::ARRAY_BUFFER, 0);\n}<\/code><\/pre>\n\n\n\n
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