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using OpenTK.Graphics.OpenGL;
using Ryujinx.Graphics.OpenGL.Image;
using System;
namespace Ryujinx.Graphics.OpenGL
{
class DrawTextureEmulation
{
private const string VertexShader = @"#version 430 core
uniform float srcX0;
uniform float srcY0;
uniform float srcX1;
uniform float srcY1;
layout (location = 0) out vec2 texcoord;
void main()
{
bool x1 = (gl_VertexID & 1) != 0;
bool y1 = (gl_VertexID & 2) != 0;
gl_Position = vec4(x1 ? 1 : -1, y1 ? -1 : 1, 0, 1);
texcoord = vec2(x1 ? srcX1 : srcX0, y1 ? srcY1 : srcY0);
}";
private const string FragmentShader = @"#version 430 core
layout (location = 0) uniform sampler2D tex;
layout (location = 0) in vec2 texcoord;
layout (location = 0) out vec4 colour;
void main()
{
colour = texture(tex, texcoord);
}";
private int _vsHandle;
private int _fsHandle;
private int _programHandle;
private int _uniformSrcX0Location;
private int _uniformSrcY0Location;
private int _uniformSrcX1Location;
private int _uniformSrcY1Location;
private bool _initialized;
public void Draw(
TextureView texture,
Sampler sampler,
float x0,
float y0,
float x1,
float y1,
float s0,
float t0,
float s1,
float t1)
{
EnsureInitialized();
GL.UseProgram(_programHandle);
texture.Bind(0);
sampler.Bind(0);
if (x0 > x1)
{
(s1, s0) = (s0, s1);
}
if (y0 > y1)
{
(t1, t0) = (t0, t1);
}
GL.Uniform1(_uniformSrcX0Location, s0);
GL.Uniform1(_uniformSrcY0Location, t0);
GL.Uniform1(_uniformSrcX1Location, s1);
GL.Uniform1(_uniformSrcY1Location, t1);
GL.ViewportIndexed(0, MathF.Min(x0, x1), MathF.Min(y0, y1), MathF.Abs(x1 - x0), MathF.Abs(y1 - y0));
GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
}
private void EnsureInitialized()
{
if (_initialized)
{
return;
}
_initialized = true;
_vsHandle = GL.CreateShader(ShaderType.VertexShader);
_fsHandle = GL.CreateShader(ShaderType.FragmentShader);
GL.ShaderSource(_vsHandle, VertexShader);
GL.ShaderSource(_fsHandle, FragmentShader);
GL.CompileShader(_vsHandle);
GL.CompileShader(_fsHandle);
_programHandle = GL.CreateProgram();
GL.AttachShader(_programHandle, _vsHandle);
GL.AttachShader(_programHandle, _fsHandle);
GL.LinkProgram(_programHandle);
GL.DetachShader(_programHandle, _vsHandle);
GL.DetachShader(_programHandle, _fsHandle);
_uniformSrcX0Location = GL.GetUniformLocation(_programHandle, "srcX0");
_uniformSrcY0Location = GL.GetUniformLocation(_programHandle, "srcY0");
_uniformSrcX1Location = GL.GetUniformLocation(_programHandle, "srcX1");
_uniformSrcY1Location = GL.GetUniformLocation(_programHandle, "srcY1");
}
public void Dispose()
{
if (!_initialized)
{
return;
}
GL.DeleteShader(_vsHandle);
GL.DeleteShader(_fsHandle);
GL.DeleteProgram(_programHandle);
_initialized = false;
}
}
}
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