public UiRenderer(StatedWindow window, int maxQuadCount = DefaultMaxQuads)
{
Window = window;
RenderingApi = (GfxRenderer)Window.Renderer;
UiShader = ShaderProgram.Link(new ShaderSingle[]
{
ShaderSingle.Compile(@"
#version 330 core
layout (location = 0) in vec2 a_Position;
layout (location = 1) in vec4 a_Color;
layout (location = 2) in vec2 a_TextureCoords;
layout (location = 3) in float a_SamplerIndex;
uniform mat4 u_Projection;
out vec4 f_Color;
out vec2 f_TextureCoords;
flat out int f_SamplerIndex;
void main()
{
f_Color = a_Color;
f_TextureCoords = a_TextureCoords;
f_SamplerIndex = int(a_SamplerIndex);
gl_Position = u_Projection * vec4(a_Position, -1.0f, 1.0f);
// Shift the vertex coordinates, so that (0,0) points to bottom left corner
gl_Position.x -= 1;
gl_Position.y -= 1;
}
", ShaderType.VertexShader),
ShaderSingle.Compile(@"
#version 330 core
in vec4 f_Color;
in vec2 f_TextureCoords;
flat in int f_SamplerIndex;
uniform sampler2D u_Textures[${MaxTextureUnits}];
out vec4 o_Color;
void main()
{
if (f_SamplerIndex == 0)
o_Color = f_Color;
else
o_Color = texture(u_Textures[f_SamplerIndex - 1], f_TextureCoords) * f_Color;
}
".Replace("${MaxTextureUnits}", GL.GetInteger(GetPName.MaxTextureImageUnits).ToString()), ShaderType.FragmentShader),
});
MaxQuads = maxQuadCount;
MaxVertices = MaxQuads * VerticesPerQuad;
MaxIndices = MaxQuads * IndicesPerQuad;
MaxTextures = GL.GetInteger(GetPName.MaxTextureImageUnits);
PendingVertices = new List <UiVertex>();
PendingIndices = new List <uint>();
PendingTextures = new List <Texture>();
Vao = new VertexArray <UiVertex>(
BufferUsageHint.DynamicDraw,
new UiVertex[MaxVertices],
new uint[MaxIndices]);
Vao.EnableAttributeArray(0, "Position");
Vao.EnableAttributeArray(1, "Color");
Vao.EnableAttributeArray(2, "TextureCoords");
Vao.EnableAttributeArray(3, "SamplerIndex");
}
public GfxRenderer(StatedWindow parent)
{
Parent = parent;
}
