readRenderTargetPixels method

void readRenderTargetPixels(WebGLRenderTarget renderTarget, dynamic x, dynamic y, dynamic width, dynamic height, dynamic buffer, dynamic activeCubeFaceIndex,)

Implementation

void readRenderTargetPixels(WebGLRenderTarget renderTarget, x, y, width,
    height, buffer, activeCubeFaceIndex) {
  var framebuffer = properties.get(renderTarget)["__webglFramebuffer"];

  if (renderTarget.isWebGLCubeRenderTarget && activeCubeFaceIndex != null) {
    framebuffer = framebuffer[activeCubeFaceIndex];
  }

  if (framebuffer != null) {
    state.bindFramebuffer(_gl.FRAMEBUFFER, framebuffer);

    try {
      var texture = renderTarget.texture;
      var textureFormat = texture.format;
      var textureType = texture.type;

      if (textureFormat != RGBAFormat &&
          utils.convert(textureFormat) !=
              _gl.getParameter(_gl.IMPLEMENTATION_COLOR_READ_FORMAT)) {
        print(
            'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in RGBA or implementation defined format.');
        return;
      }

      var halfFloatSupportedByExt = textureType == HalfFloatType &&
          (extensions.get('EXT_color_buffer_half_float') ||
              (capabilities.isWebGL2 &&
                  extensions.get('EXT_color_buffer_float')));

      if (textureType != UnsignedByteType &&
          utils.convert(textureType) !=
              _gl.getParameter(_gl
                  .IMPLEMENTATION_COLOR_READ_TYPE) && // IE11, Edge and Chrome Mac < 52 (#9513)
          !(textureType == FloatType &&
              (capabilities.isWebGL2 ||
                  extensions.get('OES_texture_float') ||
                  extensions.get(
                      'WEBGL_color_buffer_float'))) && // Chrome Mac >= 52 and Firefox
          !halfFloatSupportedByExt) {
        print(
            'THREE.WebGLRenderer.readRenderTargetPixels: renderTarget is not in UnsignedByteType or implementation defined type.');
        return;
      }


      // the following if statement ensures valid read requests (no out-of-bounds pixels, see #8604)

      if ((x >= 0 && x <= (renderTarget.width - width)) &&
          (y >= 0 && y <= (renderTarget.height - height))) {
        // _gl.readPixels(x, y, width, height, utils.convert(textureFormat),
        //     utils.convert(textureType), buffer);
        _gl.readPixels(x, y, width, height, utils.convert(textureFormat),
            utils.convert(textureType), buffer);
      }

    } finally {
      var framebuffer = (_currentRenderTarget != null)
          ? properties.get(_currentRenderTarget)["__webglFramebuffer"]
          : null;
      state.bindFramebuffer(_gl.FRAMEBUFFER, framebuffer);
    }
  }
}