portersky
78d0515e8b
Added scenes/sphere.{hpp,cpp} using the cube-to-sphere
approach from nrz.cpp, but with corrected math: vertices
are simply normalized to project onto the unit sphere
(the original used a broken formula with p=50.0 as an
exponent).
The sphere uses indexed geometry with position, normal,
and UV attributes, plus a simple diffuse lighting shader.
Press 1/2 to switch between cube and sphere scenes.
Updated .gitignore to exclude generated PNG screenshots.
40 lines
762 B
C++
40 lines
762 B
C++
#pragma once
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#include <chrono>
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#include "glm/glm.hpp"
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#include "cbt/scene.hpp"
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#include "cbt/opengl/buffer.hpp"
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#include "cbt/opengl/shader.hpp"
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#include "cbt/opengl/vao.hpp"
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namespace cbt::scenes {
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class sphere final : public scene {
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public:
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sphere();
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auto init() -> bool override;
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auto update(float delta_time) -> void override;
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auto render() -> void override;
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private:
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opengl::shader m_prog;
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opengl::buffer m_vbo;
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opengl::buffer m_ebo{opengl::buffer_type::index};
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opengl::vao m_vao;
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GLint m_loc_proj = -1;
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GLint m_loc_view = -1;
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GLint m_loc_model = -1;
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GLsizei m_index_count = 0;
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std::chrono::steady_clock::time_point m_start;
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auto build_mesh() -> void;
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auto build_shader() -> bool;
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};
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}
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