protected bool generateTexture(DrawContext dc, int width, int height)
{
GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.
OGLStackHandler ogsh = new OGLStackHandler();
Matrix geoToCartesian = this.computeGeographicToCartesianTransform(this.sector);
try
{
ogsh.pushAttrib(gl, GL2.GL_COLOR_BUFFER_BIT
| GL2.GL_ENABLE_BIT
| GL2.GL_TRANSFORM_BIT
| GL2.GL_VIEWPORT_BIT);
// Fill the frame buffer with transparent black.
gl.glClearColor(0f, 0f, 0f, 0f);
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
gl.glDisable(GL.GL_BLEND);
gl.glDisable(GL.GL_CULL_FACE);
gl.glDisable(GL.GL_DEPTH_TEST);
// Setup a viewport with the dimensions of the texture, and a projection matrix of dimension 2.0 (along
// each axis) centered at the origin. Using a projection matrix with these dimensions ensures that incoming
// vertices are rasterized without any rounding error.
ogsh.pushProjectionIdentity(gl);
gl.glViewport(0, 0, width, height);
gl.glOrtho(-1d, 1d, -1d, 1d, -1d, 1d);
ogsh.pushModelviewIdentity(gl);
ogsh.pushTextureIdentity(gl);
if (this.sourceTexture != null)
{
try
{
gl.glEnable(GL.GL_TEXTURE_2D);
if (!this.sourceTexture.bind(dc))
{
return(false);
}
this.sourceTexture.applyInternalTransform(dc);
// Setup the texture to replace the fragment color at each pixel.
gl.glTexEnvf(GL2.GL_TEXTURE_ENV, GL2.GL_TEXTURE_ENV_MODE, GL2.GL_REPLACE);
int tessellationDensity = this.getTessellationDensity();
this.drawQuad(dc, geoToCartesian, tessellationDensity, tessellationDensity);
}
finally
{
gl.glTexEnvf(GL2.GL_TEXTURE_ENV, GL2.GL_TEXTURE_ENV_MODE, OGLUtil.DEFAULT_TEX_ENV_MODE);
gl.glBindTexture(GL.GL_TEXTURE_2D, 0);
}
}
}
finally
{
ogsh.pop(gl);
}
return(true);
}
