/// <summary>
/// Helper method to reduce lines of code related to simple font drawing.
/// Calls Begin(), then LoadVBOs(), then DrawVBOs(), then End()
/// </summary>
public void Draw()
{
GL.UseProgram(InstanceSharedState.ShaderVariables.ShaderProgram);
if (_useDefaultBlendFunction)
{
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
}
GL.UniformMatrix4(InstanceSharedState.ShaderVariables.MVPUniformLocation, false, ref _projectionMatrix);
GL.Uniform1(InstanceSharedState.ShaderVariables.SamplerLocation, 0);
GL.ActiveTexture(InstanceSharedState.DefaultTextureUnit);
int start = 0;
_vertexArrayObject.Bind();
GL.Disable(EnableCap.IndexArray); //disable index array if any
foreach (var primitive in _glFontDrawingPimitives)
{
var font = primitive.Font;
if (font != null)
{
GL.ActiveTexture(QFontSharedState.DefaultTextureUnit);
// Use DrawArrays - first draw drop shadows, then draw actual font primitive
if (primitive.ShadowVertexRepr.Count > 0)
{
//int index = primitive.Font.FontData.CalculateMaxHeight();
GL.BindTexture(TextureTarget.Texture2D, font.dropShadowFont.FontData.Pages[0].GLTexID);
GL.DrawArrays(PrimitiveType.Triangles, start, primitive.ShadowVertexRepr.Count);
start += primitive.ShadowVertexRepr.Count;
}
GL.BindTexture(TextureTarget.Texture2D, font.Pages[0].GLTexID);
GL.DrawArrays(PrimitiveType.Triangles, start, primitive.CurrentVertexRepr.Count);
}
else
{
int i = 0;
}
start += primitive.CurrentVertexRepr.Count;
}
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
}
/// <summary>
/// Draws the text stored in this drawing
/// </summary>
public void Draw()
{
GL.UseProgram(InstanceSharedState.ShaderVariables.ShaderProgram);
if (_useDefaultBlendFunction)
{
GL.Enable(EnableCap.Blend);
#if OPENGL_ES
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
#else
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
#endif
}
GL.UniformMatrix4(InstanceSharedState.ShaderVariables.ProjectionMatrixUniformLocation, false, ref _projectionMatrix);
GL.Uniform1(InstanceSharedState.ShaderVariables.SamplerLocation, 0);
GL.ActiveTexture(InstanceSharedState.DefaultTextureUnit);
int start = 0;
VertexArrayObject.Bind();
foreach (var primitive in _glFontDrawingPrimitives)
{
GL.UniformMatrix4(InstanceSharedState.ShaderVariables.ModelViewMatrixUniformLocation, false, ref primitive.ModelViewMatrix);
var dpt = PrimitiveType.Triangles;
GL.ActiveTexture(SharedState.DefaultTextureUnit);
// Use DrawArrays - first draw drop shadows, then draw actual font primitive
if (primitive.ShadowVertexRepr.Count > 0)
{
//int index = primitive.Font.FontData.CalculateMaxHeight();
GL.BindTexture(TextureTarget.Texture2D, primitive.Font.FontData.DropShadowFont.FontData.Pages[0].TextureID);
GL.DrawArrays(dpt, start, primitive.ShadowVertexRepr.Count);
start += primitive.ShadowVertexRepr.Count;
}
GL.BindTexture(TextureTarget.Texture2D, primitive.Font.FontData.Pages[0].TextureID);
GL.DrawArrays(dpt, start, primitive.CurrentVertexRepr.Count);
start += primitive.CurrentVertexRepr.Count;
}
#if !OPENGL_ES
GL.BindVertexArray(0);
#endif
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
}