public Visual()
{
// Vertex positions
float[] positions =
{
1.0f, -1.0f,
1.0f, 1.0f,
-1.0f, -1.0f,
-1.0f, 1.0f
};
// Reserve a name for the buffer object.
bufferQuad = GL.GenBuffer();
// Bind it to the GL_ARRAY_BUFFER target.
GL.BindBuffer(BufferTarget.ArrayBuffer, bufferQuad);
// Allocate space for it (sizeof(positions)
GL.BufferData(BufferTarget.ArrayBuffer
, (IntPtr) (sizeof(float) * positions.Length), positions, BufferUsageHint.StaticDraw);
GL.BindVertexArray(bufferQuad);
GL.EnableClientState(ArrayCap.VertexArray);
GL.VertexPointer(2, VertexPointerType.Float, 0, 0);
GL.BindVertexArray(0);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.Disable(EnableCap.DepthTest);
GL.ClearColor(1, 0, 0, 0);
surface = new GLTools.Texture(1, 1);
string sVertexShader = @"
varying vec2 uv;
void main() {
gl_Position = gl_Vertex;
uv = gl_Vertex.xy * 0.5f + 0.5f;
}";
string sFragmentShd = @"
varying vec2 uv;
uniform sampler2D tex;
void main() {
gl_FragColor = texture(tex, uv);
}";
shaderCopy = Shader.LoadFromStrings(sVertexShader, sFragmentShd);
loadShader("");
}
public void update(float timeSec, int mouseX, int mouseY, bool leftButton, int width, int height)
{
surface = GLTools.Texture.Resize(ref surface, width, height);
surface.BeginUpdate();
var resolution = new Vector2(width, height);
GL.Viewport(0, 0, width, height);
shader.Begin();
GL.Uniform1(shader.GetUniformLocation("iGlobalTime"), timeSec);
GL.Uniform2(shader.GetUniformLocation("iResolution"), resolution);
GL.Uniform3(shader.GetUniformLocation("iMouse"), new Vector3(mouseX, mouseY, leftButton ? 1.0f : 0.0f));
GL.Clear(ClearBufferMask.ColorBufferBit);
GL.BindVertexArray(bufferQuad);
GL.DrawArrays(PrimitiveType.TriangleStrip, 0, 4);
GL.BindVertexArray(0);
shader.End();
surface.EndUpdate();
}
public static Texture Resize(ref Texture surface, int width, int height)
{
if(width != surface.Width || height != surface.Height)
{
surface.Dispose();
surface = new Texture(width, height);
}
return surface;
}
