internal GLRenderSurface(int width, int height)
{
//-------------
//y axis points upward (like other OpenGL)
//x axis points to right.
//please NOTE: left lower corner of the canvas is (0,0)
//-------------
this._width = width;
this._height = height;
//setup viewport size,
//we need W:H ratio= 1:1 , square viewport
int max = Math.Max(width, height);
orthoView = MyMat4.ortho(0, max, 0, max, 0, 1); //this make our viewport W:H =1:1
flipVerticalView = MyMat4.scale(1, -1) * MyMat4.translate(new OpenTK.Vector3(0, -height, 0));
orthoAndFlip = orthoView * flipVerticalView;
//-----------------------------------------------------------------------
_shareRes = new ShaderSharedResource();
_shareRes.OrthoView = orthoView;
//-----------------------------------------------------------------------
basicFillShader = new BasicFillShader(_shareRes);
smoothLineShader = new SmoothLineShader(_shareRes);
rectFillShader = new RectFillShader(_shareRes);
gdiImgTextureShader = new GdiImageTextureShader(_shareRes);
gdiImgTextureWithWhiteTransparentShader = new GdiImageTextureWithWhiteTransparentShader(_shareRes);
glyphStencilShader = new GlyphImageStecilShader(_shareRes);
textureSubPixRendering = new ImageTextureWithSubPixelRenderingShader(_shareRes);
blurShader = new BlurShader(_shareRes);
glesTextureShader = new OpenGLESTextureShader(_shareRes);
invertAlphaFragmentShader = new InvertAlphaLineSmoothShader(_shareRes); //used with stencil ***
conv3x3TextureShader = new Conv3x3TextureShader(_shareRes);
msdfShader = new DrawingGL.MultiChannelSdf(_shareRes);
msdfSubPixelRenderingShader = new DrawingGL.MultiChannelSubPixelRenderingSdf(_shareRes);
sdfShader = new DrawingGL.SingleChannelSdf(_shareRes);
//-----------------------------------------------------------------------
//tools
tessTool = new TessTool();
//-----------------------------------------------------------------------
//GL.Enable(EnableCap.CullFace);
//GL.FrontFace(FrontFaceDirection.Cw);
//GL.CullFace(CullFaceMode.Back);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);//original **
//GL.BlendFunc(BlendingFactorSrc.SrcColor, BlendingFactorDest.One);// not apply alpha to src
//GL.BlendFuncSeparate(BlendingFactorSrc.SrcColor, BlendingFactorDest.OneMinusSrcAlpha,
// BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
//GL.BlendFuncSeparate(BlendingFactorSrc.SrcColor, BlendingFactorDest.OneMinusSrcColor, BlendingFactorSrc.SrcAlpha, BlendingFactorDest.Zero);
GL.ClearColor(1, 1, 1, 1);
//-------------------------------------------------------------------------------
GL.Viewport(0, 0, width, height);
}
FrameBuffer _currentFrameBuffer;//default = null, system provide frame buffer
internal CanvasGL2d(int canvasW, int canvasH)
{
this.canvasW = canvasW;
this.canvasH = canvasH;
////setup viewport size
int max = Math.Max(canvasW, canvasH);
////square viewport
orthoView = MyMat4.ortho(0, max, 0, max, 0, 1);
flipVerticalView = MyMat4.scale(1, -1) * MyMat4.translate(new OpenTK.Vector3(0, -max, 0));
orthoAndFlip = orthoView * flipVerticalView;
//-----------------------------------------------------------------------
shaderRes = new CanvasToShaderSharedResource();
shaderRes.OrthoView = orthoView;
//-----------------------------------------------------------------------
basicFillShader = new BasicFillShader(shaderRes);
smoothLineShader = new SmoothLineShader(shaderRes);
rectFillShader = new RectFillShader(shaderRes);
gdiImgTextureShader = new GdiImageTextureShader(shaderRes);
gdiImgTextureWithWhiteTransparentShader = new GdiImageTextureWithWhiteTransparentShader(shaderRes);
textureSubPixRendering = new ImageTextureWithSubPixelRenderingShader(shaderRes);
blurShader = new BlurShader(shaderRes);
glesTextureShader = new OpenGLESTextureShader(shaderRes);
invertAlphaFragmentShader = new InvertAlphaLineSmoothShader(shaderRes); //used with stencil ***
// tessListener.Connect(tess,
//Tesselate.Tesselator.WindingRuleType.Odd, true);
conv3x3TextureShader = new Conv3x3TextureShader(shaderRes);
msdfShader = new DrawingGL.MultiChannelSdf(shaderRes);
msdfSubPixelRenderingShader = new DrawingGL.MultiChannelSubPixelRenderingSdf(shaderRes);
sdfShader = new DrawingGL.SingleChannelSdf(shaderRes);
//----
Tesselator tess = new Tesselator();
tess.WindingRule = Tesselator.WindingRuleType.Odd;
tessTool = new TessTool(tess);
//-----------------------------------------------------------------------
//GL.Enable(EnableCap.CullFace);
//GL.FrontFace(FrontFaceDirection.Cw);
//GL.CullFace(CullFaceMode.Back);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);//original **
//GL.BlendFunc(BlendingFactorSrc.SrcColor, BlendingFactorDest.One);// not apply alpha to src
//GL.BlendFuncSeparate(BlendingFactorSrc.SrcColor, BlendingFactorDest.OneMinusSrcAlpha,
// BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
//GL.BlendFuncSeparate(BlendingFactorSrc.SrcColor, BlendingFactorDest.OneMinusSrcColor, BlendingFactorSrc.SrcAlpha, BlendingFactorDest.Zero);
GL.ClearColor(1, 1, 1, 1);
//-------------------------------------------------------------------------------
GL.Viewport(0, 0, canvasW, canvasH);
}