/// <summary>
/// Creates the render context provider. Must also create the OpenGL extensions.
/// </summary>
/// <param name="openGLVersion">The desired OpenGL version.</param>
/// <param name="gl">The OpenGL context.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="bitDepth">The bit depth.</param>
/// <param name="parameter">The parameter</param>
/// <returns></returns>
public override bool Create(OpenGLVersion openGLVersion, OpenGL gl, int width, int height, int bitDepth, object parameter)
{
this.gl = gl;
// Call the base class.
base.Create(openGLVersion, gl, width, height, bitDepth, parameter);
uint[] ids = new uint[1];
// First, create the frame buffer and bind it.
gl.GenFramebuffersEXT(1, ids);
gl.ThrowIfErrors();
frameBufferID = ids[0];
gl.BindFramebufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, frameBufferID);
gl.ThrowIfErrors();
// Create the colour render buffer and bind it, then allocate storage for it.
gl.GenRenderbuffersEXT(1, ids);
gl.ThrowIfErrors();
colourRenderBufferID = ids[0];
gl.BindRenderbufferEXT(OpenGL.GL_RENDERBUFFER_EXT, colourRenderBufferID);
gl.ThrowIfErrors();
gl.RenderbufferStorageEXT(OpenGL.GL_RENDERBUFFER_EXT, OpenGL.GL_RGBA, width, height);
gl.ThrowIfErrors();
// Create the depth stencil render buffer and bind it, then allocate storage for it.
gl.GenRenderbuffersEXT(1, ids);
gl.ThrowIfErrors();
depthStencilRenderBufferID = ids[0];
gl.BindRenderbufferEXT(OpenGL.GL_RENDERBUFFER_EXT, depthStencilRenderBufferID);
gl.ThrowIfErrors();
gl.RenderbufferStorageEXT(OpenGL.GL_RENDERBUFFER_EXT, OpenGL.GL_DEPTH24_STENCIL8, width, height);
gl.ThrowIfErrors();
// Set the render buffer for colour, depth and stencil.
gl.FramebufferRenderbufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_COLOR_ATTACHMENT0_EXT,
OpenGL.GL_RENDERBUFFER_EXT, colourRenderBufferID);
gl.ThrowIfErrors();
gl.FramebufferRenderbufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_DEPTH_ATTACHMENT_EXT,
OpenGL.GL_RENDERBUFFER_EXT, depthStencilRenderBufferID);
gl.ThrowIfErrors();
gl.FramebufferRenderbufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_STENCIL_ATTACHMENT_EXT,
OpenGL.GL_RENDERBUFFER_EXT, depthStencilRenderBufferID);
gl.ThrowIfErrors();
ValidateFramebufferStatus(gl.CheckFramebufferStatusEXT(OpenGL.GL_FRAMEBUFFER_EXT));
dibSectionDeviceContext = Win32.CreateCompatibleDC(deviceContextHandle);
// Create the DIB section.
dibSection.Create(dibSectionDeviceContext, width, height, bitDepth);
return(true);
}
public FBO(OpenGL gl, int width, int height)
{
_gl = gl;
if (width < 1)
{
width = 16;
}
if (height < 1)
{
height = 16;
}
gl.GenFramebuffersEXT(1, _fbo);
ColorTexture = new Texture(gl);
using (new Bind(ColorTexture))
{
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_WRAP_S, OpenGL.GL_REPEAT);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_WRAP_T, OpenGL.GL_REPEAT);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MIN_FILTER, OpenGL.GL_NEAREST);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MAG_FILTER, OpenGL.GL_NEAREST);
gl.TexImage2D(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_RGBA, width, height, 0, OpenGL.GL_RGBA, OpenGL.GL_UNSIGNED_BYTE, null);
}
DepthTexture = new Texture(gl);
using (new Bind(DepthTexture))
{
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_WRAP_S, OpenGL.GL_REPEAT);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_WRAP_T, OpenGL.GL_REPEAT);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MIN_FILTER, OpenGL.GL_NEAREST);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MAG_FILTER, OpenGL.GL_NEAREST);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_DEPTH_TEXTURE_MODE_ARB, OpenGL.GL_INTENSITY);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_COMPARE_MODE, OpenGL.GL_COMPARE_R_TO_TEXTURE_ARB);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_COMPARE_FUNC, OpenGL.GL_LEQUAL);
gl.TexImage2D(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_DEPTH_COMPONENT24, width, height, 0, OpenGL.GL_DEPTH_COMPONENT, OpenGL.GL_UNSIGNED_BYTE, null);
}
using (new Bind(this))
{
gl.FramebufferTexture2DEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_COLOR_ATTACHMENT0_EXT, OpenGL.GL_TEXTURE_2D, ColorTexture.Handle, 0);
gl.FramebufferTexture2DEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_DEPTH_ATTACHMENT_EXT, OpenGL.GL_TEXTURE_2D, DepthTexture.Handle, 0);
var status = _gl.CheckFramebufferStatusEXT(OpenGL.GL_FRAMEBUFFER_EXT);
if (status != OpenGL.GL_FRAMEBUFFER_COMPLETE_EXT)
{
throw new Exception();
}
}
}
/// <summary>
/// Creates the render context provider. Must also create the OpenGL extensions.
/// </summary>
/// <param name="openGLVersion">The desired OpenGL version.</param>
/// <param name="gl">The OpenGL context.</param>
/// <param name="width">The width.</param>
/// <param name="height">The height.</param>
/// <param name="bitDepth">The bit depth.</param>
/// <param name="parameter">The parameter</param>
/// <returns></returns>
public override bool Create(OpenGLVersion openGLVersion, OpenGL gl, int width, int height, int bitDepth, object parameter)
{
// Call the base class.
base.Create(openGLVersion, gl, width, height, bitDepth, parameter);
uint[] ids = new uint[1];
// Multi sampled fbo
gl.GenFramebuffersEXT(1, ids);
gl.ThrowIfErrors();
msFrameBufferID = ids[0];
gl.BindFramebufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, msFrameBufferID);
gl.ThrowIfErrors();
// Create the colour render buffer and bind it, then allocate storage for it.
gl.GenRenderbuffersEXT(1, ids);
gl.ThrowIfErrors();
msColourRenderBufferID = ids[0];
gl.BindRenderbufferEXT(OpenGL.GL_RENDERBUFFER_EXT, msColourRenderBufferID);
gl.ThrowIfErrors();
gl.RenderbufferStorageMultisampleEXT(OpenGL.GL_RENDERBUFFER_EXT, MSAA, OpenGL.GL_RGBA, width, height);
gl.ThrowIfErrors();
gl.FramebufferRenderbufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_COLOR_ATTACHMENT0_EXT, OpenGL.GL_RENDERBUFFER_EXT, msColourRenderBufferID);
gl.ThrowIfErrors();
// Create the depth stencil render buffer and bind it, then allocate storage for it.
gl.GenRenderbuffersEXT(1, ids);
gl.ThrowIfErrors();
msDepthStencilRenderBufferID = ids[0];
gl.BindRenderbufferEXT(OpenGL.GL_RENDERBUFFER_EXT, msDepthStencilRenderBufferID);
gl.ThrowIfErrors();
gl.RenderbufferStorageMultisampleEXT(OpenGL.GL_RENDERBUFFER_EXT, MSAA, OpenGL.GL_DEPTH24_STENCIL8, width, height);
gl.ThrowIfErrors();
// Set the render buffer for depth and stencil.
gl.FramebufferRenderbufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_DEPTH_ATTACHMENT_EXT,
OpenGL.GL_RENDERBUFFER_EXT, msDepthStencilRenderBufferID);
gl.ThrowIfErrors();
gl.FramebufferRenderbufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_STENCIL_ATTACHMENT_EXT,
OpenGL.GL_RENDERBUFFER_EXT, msDepthStencilRenderBufferID);
gl.ThrowIfErrors();
ValidateFramebufferStatus(gl.CheckFramebufferStatusEXT(OpenGL.GL_FRAMEBUFFER_EXT));
return(true);
}
public GL_GUI_Context(Window window, float width, float height)
{
this.window = window;
this.Width = width;
this.Height = height;
context = SDL.SDL_GL_CreateContext(window.Handle);
SDL.SDL_GL_MakeCurrent(window.Handle, context);
gl = new OpenGL();
gl.Enable(OpenGL.GL_TEXTURE_2D);
shaderProgram = new ShaderProgram();
shaderProgram.Create(gl, VERTEX_SHADER, FRAGMENT_SHADER, null);
shaderProgram.BindAttributeLocation(gl, 0, "in_Position");
shaderProgram.BindAttributeLocation(gl, 1, "in_Color");
shaderProgram.AssertValid(gl);
gl.GenFramebuffersEXT(1, framebuffers);
gl.BindFramebufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, framebuffers[0]);
gl.GenTextures(1, framebufferTargets);
gl.BindTexture(OpenGL.GL_TEXTURE_2D, framebufferTargets[0]);
gl.TexImage2D(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_RGB, window.DisplayWidth, window.DisplayHeight, 0, OpenGL.GL_RGB, OpenGL.GL_UNSIGNED_BYTE, IntPtr.Zero);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MIN_FILTER, OpenGL.GL_NEAREST);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MAG_FILTER, OpenGL.GL_NEAREST);
gl.FramebufferTexture(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_COLOR_ATTACHMENT0_EXT, framebufferTargets[0], 0);
gl.DrawBuffers(1, new uint[] { OpenGL.GL_COLOR_ATTACHMENT0_EXT });
if (gl.CheckFramebufferStatusEXT(OpenGL.GL_FRAMEBUFFER_EXT) != OpenGL.GL_FRAMEBUFFER_COMPLETE_EXT)
{
throw new Exception("Frame buffer setup not complete");
}
gl.BindFramebufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, 0);
gl.BindTexture(OpenGL.GL_TEXTURE_2D, 0);
ortho = new float[] {
2.0f / Width, 0.0f, 0.0f, 0.0f,
0.0f, -2.0f / Height, 0.0f, 0.0f,
0.0f, 0.0f, -1.0f, 0.0f,
-1.0f, 1.0f, 0.0f, 1.0f,
};
gl.Viewport(0, 0, window.DisplayWidth, window.DisplayHeight);
gl.Enable(OpenGL.GL_BLEND);
gl.BlendFunc(OpenGL.GL_SRC_ALPHA, OpenGL.GL_ONE_MINUS_SRC_ALPHA);
gl.Disable(OpenGL.GL_CULL_FACE);
gl.Disable(OpenGL.GL_DEPTH_TEST);
gl.ActiveTexture(OpenGL.GL_TEXTURE0);
gl.Enable(OpenGL.GL_SCISSOR_TEST);
shaderProgram.Bind(gl);
shaderProgram.SetUniformMatrix4(gl, "projectionMatrix", ortho);
vertexBufferArray = new VertexBufferArray();
vertexBufferArray.Create(gl);
vertexBufferArray.Bind(gl);
}
public static FrameBuffer Create(OpenGL gl, int width, int height)
{
Texture tex = new Texture();
tex.Create(gl);
tex.Bind(gl);
gl.TexParameter(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
gl.TexParameter(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
gl.TexParameter(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl.TexParameter(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
gl.TexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, null);
gl.BindTexture(GL_TEXTURE_2D, 0);
//------
uint[] frameBufferIds = new uint[1];
gl.GenFramebuffersEXT(1, frameBufferIds);
gl.BindFramebufferEXT(GL_FRAMEBUFFER_EXT, frameBufferIds[0]);
gl.FramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, tex.TextureName, 0);
//------
uint[] renderBufferIds = new uint[1];
gl.GenRenderbuffersEXT(1, renderBufferIds);
gl.BindRenderbufferEXT(GL_RENDERBUFFER_EXT, renderBufferIds[0]);
gl.RenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, width, height);
//-------------------------
//Attach depth buffer to FBO
gl.FramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, renderBufferIds[0]);
//------
var status = gl.CheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
if (status == GL_FRAMEBUFFER_COMPLETE_EXT)
{
FrameBuffer.Unbind(gl);
return(new FrameBuffer(gl, frameBufferIds, renderBufferIds, tex));
}
switch (status)
{
//case GL_FRAMEBUFFER_UNDEFINED_EXT:
// throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_UNDEFINED_EXT));
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT));
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT));
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT));
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT));
case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT:
throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT));
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT));
case GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS:
throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS));
case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
throw new InvalidOperationException(nameof(GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT));
default:
throw new InvalidOperationException("GL_FRAMEBUFFER unknown error");
}
}
private void UpdatePostProcessing(bool enabled)
{
if (!postprocessingEnabled && enabled)
{
// Setup back buffer
gl.ActiveTexture(OpenGL.GL_TEXTURE0);
gl.GenTextures(1, glFrameBufferTexArray);
fboTexture = glFrameBufferTexArray[0];
gl.BindTexture(OpenGL.GL_TEXTURE_2D, fboTexture);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MAG_FILTER, OpenGL.GL_LINEAR);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_MIN_FILTER, OpenGL.GL_LINEAR);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_WRAP_S, OpenGL.GL_CLAMP_TO_EDGE);
gl.TexParameter(OpenGL.GL_TEXTURE_2D, OpenGL.GL_TEXTURE_WRAP_T, OpenGL.GL_CLAMP_TO_EDGE);
gl.TexImage2D(OpenGL.GL_TEXTURE_2D, 0, OpenGL.GL_RGBA,
viewportSize.Width, viewportSize.Height, 0,
OpenGL.GL_RGBA, OpenGL.GL_UNSIGNED_BYTE, null);
gl.BindTexture(OpenGL.GL_TEXTURE_2D, 0);
// Setup depth buffer
gl.GenRenderbuffersEXT(1, glRenderBufferArray);
rboDepth = glRenderBufferArray[0];
gl.BindRenderbufferEXT(OpenGL.GL_RENDERBUFFER, rboDepth);
gl.RenderbufferStorageEXT(OpenGL.GL_RENDERBUFFER, OpenGL.GL_DEPTH_COMPONENT16,
viewportSize.Width, viewportSize.Height);
gl.BindRenderbufferEXT(OpenGL.GL_RENDERBUFFER, 0);
// Setup framebuffer
gl.GenFramebuffersEXT(1, glFrameBufferArray);
fbo = glFrameBufferArray[0];
gl.BindFramebufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, fbo);
gl.FramebufferTexture2DEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_COLOR_ATTACHMENT0_EXT,
OpenGL.GL_TEXTURE_2D, fboTexture, 0);
gl.FramebufferRenderbufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, OpenGL.GL_DEPTH_ATTACHMENT_EXT,
OpenGL.GL_RENDERBUFFER, rboDepth);
uint fboStatus = gl.CheckFramebufferStatusEXT(OpenGL.GL_FRAMEBUFFER_EXT);
if (gl.CheckFramebufferStatusEXT(OpenGL.GL_FRAMEBUFFER_EXT) != OpenGL.GL_FRAMEBUFFER_COMPLETE_EXT)
{
postprocessingEnabled = false;
gl.DeleteRenderbuffersEXT(1, glRenderBufferArray);
gl.DeleteTextures(1, glFrameBufferTexArray);
gl.DeleteFramebuffersEXT(1, glFrameBufferArray);
return;
}
gl.BindFramebufferEXT(OpenGL.GL_FRAMEBUFFER_EXT, 0);
// Setup post-processing shader
postShader = new Shader(gl, ManifestResourceLoader.LoadTextFile(@"Resources\Shaders\screen.vert"),
ManifestResourceLoader.LoadTextFile(@"Resources\Shaders\screen.frag"), null);
if (!postShader.Compiled)
{
throw new Exception(postShader.CompilerOutput);
}
postprocessingEnabled = true;
}
else if (postprocessingEnabled && !enabled)
{
gl.DeleteRenderbuffersEXT(1, glRenderBufferArray);
gl.DeleteTextures(1, glFrameBufferTexArray);
gl.DeleteFramebuffersEXT(1, glFrameBufferArray);
postShader.Dispose();
postShader = null;
postprocessingEnabled = false;
}
}