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Switch-Toolbox/Switch_Toolbox_Library/Rendering/DrawableBackground.cs
2019-04-22 17:52:21 -04:00

150 lines
4.5 KiB
C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Drawing;
using System.Threading.Tasks;
using GL_EditorFramework.GL_Core;
using GL_EditorFramework.Interfaces;
using GL_EditorFramework.EditorDrawables;
using GL_EditorFramework;
using OpenTK;
using OpenTK.Graphics.OpenGL;
using Switch_Toolbox.Library;
namespace Switch_Toolbox.Library.Rendering
{
public class DrawableBackground : AbstractGlDrawable
{
protected static ShaderProgram solidColorShaderProgram;
int vbo_position;
public void Destroy()
{
bool buffersWereInitialized = vbo_position != 0;
if (!buffersWereInitialized)
return;
GL.DeleteBuffer(vbo_position);
}
public void UpdateVertexData()
{
Vector3[] vertices = new Vector3[3];
vertices[0] = new Vector3(-1f, -1f, 1f);
vertices[1] = new Vector3(3f, -1f, 1f);
vertices[2] = new Vector3(-1f, 3f, 1f);
GL.GenBuffers(1, out vbo_position);
GL.BindBuffer(BufferTarget.ArrayBuffer, vbo_position);
GL.BufferData<Vector3>(BufferTarget.ArrayBuffer,
new IntPtr(vertices.Length * Vector3.SizeInBytes),
vertices, BufferUsageHint.StaticDraw);
}
public override void Draw(GL_ControlModern control, Pass pass)
{
if (pass == Pass.TRANSPARENT || solidColorShaderProgram == null)
return;
bool buffersWereInitialized = vbo_position != 0;
if (!buffersWereInitialized)
UpdateVertexData();
if (!Runtime.OpenTKInitialized)
return;
GL.Enable(EnableCap.DepthTest);
GL.DepthFunc(DepthFunction.Lequal);
control.CurrentShader = solidColorShaderProgram;
control.UpdateModelMatrix(Matrix4.Identity);
solidColorShaderProgram.EnableVertexAttributes();
Vector3 topColor = ColorUtility.ToVector3(Runtime.backgroundGradientTop);
Vector3 bottomColor = ColorUtility.ToVector3(Runtime.backgroundGradientBottom);
solidColorShaderProgram.SetVector4("topColor", new Vector4(topColor, 1.0f));
solidColorShaderProgram.SetVector4("bottomColor", new Vector4(bottomColor, 1.0f));
BindBuffer();
solidColorShaderProgram.DisableVertexAttributes();
GL.UseProgram(0);
GL.Enable(EnableCap.CullFace);
}
private void BindBuffer()
{
GL.BindBuffer(BufferTarget.ArrayBuffer, vbo_position);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 0, 0);
GL.DrawArrays(PrimitiveType.Triangles, 0, 3);
}
public override void Draw(GL_ControlLegacy control, Pass pass)
{
if (!Runtime.OpenTKInitialized)
return;
GL.MatrixMode(MatrixMode.Projection);
GL.LoadIdentity();
GL.Enable(EnableCap.DepthTest);
GL.DepthFunc(DepthFunction.Lequal);
GL.Disable(EnableCap.Texture2D);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
GL.Begin(PrimitiveType.TriangleStrip);
GL.Color3(Runtime.backgroundGradientTop);
GL.Vertex3(1, 1, 0.99998);
GL.Vertex3(-1, 1, 0.99998);
GL.Color3(Runtime.backgroundGradientBottom);
GL.Vertex3(1, -1, 0.99998);
GL.Vertex3(-1, -1, 0.99998);
GL.End();
GL.Enable(EnableCap.Texture2D);
GL.UseProgram(0);
GL.Enable(EnableCap.CullFace);
}
public override void Prepare(GL_ControlModern control)
{
var solidColorFrag = new FragmentShader(
@"#version 330
uniform vec4 bottomColor;
uniform vec4 topColor;
in vec2 texCoord;
out vec4 FragColor;
void main(){
FragColor = mix(bottomColor, topColor, texCoord.y);
}");
var solidColorVert = new VertexShader(
@"#version 330
layout(location = 0) in vec3 position;
out vec2 texCoord;
void main(){
texCoord.xy = (position.xy + vec2(1.0)) * 0.5;
gl_Position = vec4(position, 1);
}");
solidColorShaderProgram = new ShaderProgram(solidColorFrag, solidColorVert);
}
public override void Prepare(GL_ControlLegacy control)
{
}
}
}