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154
C#/OpenGLTutorial/Rendering/Display/Shape.cs
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154
C#/OpenGLTutorial/Rendering/Display/Shape.cs
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using System.Drawing;
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using static OpenGL.GL;
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namespace OpenGLTutorial.Rendering.Display {
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public class Shape {
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public int Mode { get; set; }
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public uint Vao { get; private set; }
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private uint Vbo { get; set; }
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private float[] Vertices { get; set; }
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private bool _loaded = false;
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public Shape(float[] vertices, int mode = GL_STATIC_DRAW) {
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Vertices = vertices;
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Mode = mode;
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}
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public unsafe void Load() {
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if (_loaded || Vertices.Length == 0) return;
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_loaded = true;
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Vao = glGenVertexArray();
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Vbo = glGenBuffer();
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glBindVertexArray(Vao);
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glBindBuffer(GL_ARRAY_BUFFER, Vbo);
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fixed (float* v = &Vertices[0]) {
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glBufferData(GL_ARRAY_BUFFER, sizeof(float) * Vertices.Length, v, Mode);
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}
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glVertexAttribPointer(0, 2, GL_FLOAT, false, 8 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(1, 4, GL_FLOAT, false, 8 * sizeof(float), (void*)(2 * sizeof(float)));
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(2, 2, GL_FLOAT, false, 8 * sizeof(float), (void*)(6 * sizeof(float)));
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glEnableVertexAttribArray(2);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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}
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public void Delete() {
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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glDeleteBuffer(Vbo);
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glDeleteVertexArray(Vao);
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}
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public unsafe void SetVertices(float[] vertices) {
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Vertices = vertices;
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if (vertices.Length == 0) return;
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glBindVertexArray(Vao);
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glBindBuffer(GL_ARRAY_BUFFER, Vbo);
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fixed (float* v = &Vertices[0]) {
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glBufferData(GL_ARRAY_BUFFER, sizeof(float) * Vertices.Length, v, Mode);
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}
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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}
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public int GetVertexCount() => Vertices.Length / 8;
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}
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public static class Shapes {
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public static float[] Rectangle => new[] {
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-0.5f, 0.5f, 1f, 1f, 1f, 1f, 0.0f, 1.0f, // top left
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0.5f, 0.5f, 1f, 1f, 1f, 1f, 1.0f, 1.0f, // top right
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-0.5f, -0.5f, 1f, 1f, 1f, 1f, 0.0f, 0.0f, // bottom left
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0.5f, 0.5f, 1f, 1f, 1f, 1f, 1.0f, 1.0f, // top right
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0.5f, -0.5f, 1f, 1f, 1f, 1f, 1.0f, 0.0f, // bottom right
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-0.5f, -0.5f, 1f, 1f, 1f, 1f, 0.0f, 0.0f, // bottom left
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};
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public static float[] Triangle => new[] {
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0.0f, -0.5f, 1f, 1f, 1f, 1f, 0.5f, 1.0f, // top center
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0.5f, 0.5f, 1f, 1f, 1f, 1f, 1.0f, 0.0f, // bottom right
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-0.5f, 0.5f, 1f, 1f, 1f, 1f, 0.0f, 0.0f, // bottom left
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};
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public static float[] CreateRectangle(Dimensions position, Color color, Dimensions uv) => new[] {
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position.X, position.MaxY, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.X, uv.MaxY, // top left
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position.MaxX, position.MaxY, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.MaxX, uv.MaxY, // top right
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position.X, position.Y, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.X, uv.Y, // bottom left
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position.MaxX, position.MaxY, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.MaxX, uv.MaxY, // top right
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position.MaxX, position.Y, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.MaxX, uv.Y, // bottom right
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position.X, position.Y, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.X, uv.Y, // bottom left
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};
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public static float[] CreateTriangle(Dimensions position, Color color, Dimensions uv) => new[] {
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position.CenterX, position.Y, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.CenterX, uv.MaxY, // top center
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position.MaxX, position.MaxY, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.MaxX, uv.Y, // bottom right
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position.X, position.MaxY, color.GetRed(), color.GetGreen(), color.GetBlue(), color.GetAlpha(), uv.X, uv.Y, // bottom left
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};
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}
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public readonly struct Dimensions {
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public static Dimensions Identity => new (0.0f, 0.0f, 1.0f, 1.0f);
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public static Dimensions Centered => new (-0.5f, -0.5f, 1.0f, 1.0f);
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public float X { get; }
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public float Y { get; }
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public float Width { get; }
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public float Height { get; }
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public Dimensions(float x, float y, float width, float height) {
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X = x;
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Y = y;
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Width = width;
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Height = height;
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}
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public float MaxX => X + Width;
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public float MaxY => Y + Height;
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public float CenterX => X + (Width / 2.0f);
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public float CenterY => Y + (Height / 2.0f);
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}
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public static class ColorExtensions {
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private static float Map(float value, float min, float max, float mMin, float mMax) {
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float norm = (value - min) / (max - min);
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return (mMax - mMin) * norm + mMin;
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}
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public static float GetRed(this Color color) {
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return Map(color.R, 0, 255, 0, 1);
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}
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public static float GetGreen(this Color color) {
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return Map(color.G, 0, 255, 0, 1);
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}
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public static float GetBlue(this Color color) {
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return Map(color.B, 0, 255, 0, 1);
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}
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public static float GetAlpha(this Color color) {
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return Map(color.A, 0, 255, 0, 1);
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}
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}
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}
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