public void Show()
{
GL.ClearColor(0, 0, 0, 1);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, averageTexture);
LayerHelper.DrawQuad();
GL.BindTexture(TextureTarget.Texture2D, 0);
}
public void PostDraw()
{
// target texture
GL.FramebufferTexture2D(FramebufferTarget.FramebufferExt,
FramebufferAttachment.ColorAttachment0Ext, TextureTarget.Texture2D,
updatedAverageTexture, 0);
//LayerHelper.CheckFbo();
GL.ClearColor(0, 0, 0, 1);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// source textures
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, currentFrameTexture);
GL.ActiveTexture(TextureUnit.Texture1);
GL.BindTexture(TextureTarget.Texture2D, averageTexture);
GL.UseProgram(accumShaderProgram);
GL.Uniform1(GL.GetUniformLocation(accumShaderProgram, "currentFrameTexture"), 0); // TextureUnit.Texture0
GL.Uniform1(GL.GetUniformLocation(accumShaderProgram, "averageTexture"), 1); // TextureUnit.Texture1
float frameWeight = 1 / (float)(iteration + 1);
GL.Uniform1(GL.GetUniformLocation(accumShaderProgram, "frameWeight"), frameWeight);
// accumulate the current frame
// - read current frame and average textures
// - make linear interpolation thereof inside a fragment shader
// - render the result into updated average texture
LayerHelper.DrawQuad();
GL.UseProgram(0);
GL.ActiveTexture(TextureUnit.Texture1);
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, 0);
//swap the two average textures
uint tmp = updatedAverageTexture;
updatedAverageTexture = averageTexture;
averageTexture = tmp;
iteration++;
}
public void Draw()
{
Debug.Assert(DepthPeeler != null);
GL.ClearColor(0f, 0f, 0f, 1f);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.UseProgram(shaderProgram);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "layerTexture"), 0);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "layerIndex"), GetLayerIndex());
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2DArray, GetTexture());
LayerHelper.DrawQuad();
GL.BindTexture(TextureTarget.Texture2DArray, 0);
GL.UseProgram(0);
}
public void Draw()
{
Debug.Assert(NBuffers != null);
GL.ClearColor(0f, 0f, 0f, 1f);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.UseProgram(shaderProgram);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "nBufferLayerTexture"), 0);
GL.Uniform2(GL.GetUniformLocation(shaderProgram, "colorMask"), colorMasks[selectedColorMask]);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "layer"), selectedLayer);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2DArray, NBuffers.NBuffersTextures);
LayerHelper.DrawQuad();
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.UseProgram(0);
}
/// <summary>
/// Packs four single-channel depth images into one four-channel image.
/// </summary>
private void PackDepthImages()
{
// for visualization
//GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0);
GL.ClearColor(0f, 0f, 0f, 1f);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.Ext.FramebufferTextureLayer(
FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext,
packedDepthTextures, 0, 0);
var result = GL.Ext.CheckFramebufferStatus(FramebufferTarget.FramebufferExt);
if (result != FramebufferErrorCode.FramebufferCompleteExt)
{
throw new ApplicationException(string.Format("Bad FBO: {0}", result));
}
GL.UseProgram(packingShaderProgram);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2DArray, depthTextures);
GL.Uniform1(GL.GetUniformLocation(packingShaderProgram, "depthTexture"), 0);
LayerHelper.DrawQuad();
GL.UseProgram(0);
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0);
GL.ActiveTexture(TextureUnit.Texture0);
//GL.BindTexture(TextureTarget.Texture2DArray, packedDepthTextures);
//GL.Ext.GenerateMipmap(GenerateMipmapTarget.Texture2DArray);
GL.BindTexture(TextureTarget.Texture2D, 0);
}
protected override void DrawSingleFrame(int iteration, Scene scene, Navigation navigation)
{
Debug.Assert(DepthPeeler != null);
Camera camera = navigation.Camera;
ComputeSensorTransform(camera);
GL.ClearColor(0f, 0f, 0f, 1f);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
// bind color and depth textures
GL.ActiveTexture(TextureUnit.Texture0);
int lensSampleTex = IncrementalModeEnabled
? incrementalLensSampleTexture
: previewLensSampleTexture;
GL.BindTexture(TextureTarget.Texture3D, lensSampleTex);
//GL.ActiveTexture(TextureUnit.Texture1);
//GL.BindTexture(TextureTarget.Texture1D, pixelSampleTexture);
GL.ActiveTexture(TextureUnit.Texture2);
GL.BindTexture(TextureTarget.Texture2DArray, DepthPeeler.PackedDepthTextures);
GL.ActiveTexture(TextureUnit.Texture3);
GL.BindTexture(TextureTarget.Texture2DArray, DepthPeeler.ColorTextures);
GL.ActiveTexture(TextureUnit.Texture4);
GL.BindTexture(TextureTarget.Texture2DArray, NBuffers.NBuffersTextures);
// enable IBRT shader
GL.UseProgram(shaderProgram);
// set shader parameters (textures, lens model, ...)
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "lensSamplesTexture"), 0);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "pixelSamplesTexture"), 1);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "packedDepthTexture"), 2);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "colorTexture"), 3);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "nBuffersTexture"), 4);
GL.Uniform2(GL.GetUniformLocation(shaderProgram, "nBuffersSize"), NBuffers.Size);
GL.Uniform2(GL.GetUniformLocation(shaderProgram, "sensorSize"), camera.SensorSize);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "sensorZ"), camera.SensorZ);
GL.Uniform3(GL.GetUniformLocation(shaderProgram, "sensorShift"), camera.SensorShift3);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "near"), camera.Near);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "far"), camera.Far);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "lensFocalLength"), camera.Lens.FocalLength);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "lensApertureRadius"), camera.Lens.ApertureRadius);
//Matrix4 perspective = camera.Perspective;
//GL.UniformMatrix4(GL.GetUniformLocation(shaderProgram, "perspective"), false, ref perspective);
GL.Uniform4(GL.GetUniformLocation(shaderProgram, "frustumBounds"), camera.FrustumBounds);
// jittering
GL.Uniform2(GL.GetUniformLocation(shaderProgram, "screenSize"), new Vector2(Width, Height));
GL.Uniform2(GL.GetUniformLocation(shaderProgram, "screenSizeInv"), new Vector2(1.0f / Width, 1.0f / Height));
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "sampleCount"), (IncrementalModeEnabled ? SampleCount : PreviewSampleCount));
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "sampleCountInv"), 1.0f / (IncrementalModeEnabled ? SampleCount : PreviewSampleCount));
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "sampleIndexOffset"), IncrementalModeEnabled ? SampleCount * iteration : 0);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "totalSampleCount"), IncrementalModeEnabled ? MaxTotalSampleCount : PreviewSampleCount);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "sampleCount"), SampleCount);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "sampleCountInv"), 1.0f / SampleCount);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "sampleIndexOffset"), SampleCount * iteration);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "totalSampleCount"), TotalSampleCount);
GL.Uniform2(GL.GetUniformLocation(shaderProgram, "cameraShift"), camera.LensShift);
GL.UniformMatrix3(GL.GetUniformLocation(shaderProgram, "sensorTransform"), 1, false, sensorTransform3x3);
// draw the quad
LayerHelper.DrawQuad();
// disable shader
GL.UseProgram(0);
// unbind textures
GL.ActiveTexture(TextureUnit.Texture4);
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.ActiveTexture(TextureUnit.Texture3);
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.ActiveTexture(TextureUnit.Texture2);
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.ActiveTexture(TextureUnit.Texture1);
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, 0);
}
public void CreateNBuffers(DepthPeeler peeler)
{
// NOTE: we are only considering the first 4 depth layers packed into 1 image
// - create the level 0 N-buffer from the original packedDepthTexture
// - copy it at 1/4 resolution (using mip-mapping??)
// - create the rest of N-buffer level from the previous levels
// - for each level i in [1; LevelCount]:
// - attach level i-1 as the source texture
// - attach level i as the render target
// - render a quad
// Different shaders are used for the first level and the rest of levels.
// Since we are creating single set of N-buffers for four depth images
// in parallel in the first level we must find the extrema even within
// the vector components.
//for (int i = 0; i < LayerCount; i++)
//{
// GL.BindTexture(TextureTarget.Texture2D, nBuffersTextures[i]);
// GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
//}
GL.PushAttrib(AttribMask.ViewportBit);
GL.Viewport(0, 0, nbuffersWidth, nbuffersHeight);
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, fboHandle);
GL.DepthFunc(DepthFunction.Always);
// the first level is taken directly from the original packed depth texture (without offsets)
GL.UseProgram(level0shaderProgram);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2DArray, peeler.PackedDepthTextures);
GL.Uniform1(GL.GetUniformLocation(level0shaderProgram, "packedDepthTexture"), 0);
GL.Uniform1(GL.GetUniformLocation(level0shaderProgram, "layer"), 0);
GL.Ext.FramebufferTextureLayer(
FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext,
nBuffersTextureArray, 0, 0); // layer 0
LayerHelper.DrawQuad();
// -- DEBUG --
//GL.UseProgram(0);
//GL.ActiveTexture(TextureUnit.Texture0);
//GL.BindTexture(TextureTarget.Texture2D, prevMinTexture);
//// copy the source texture from the frame buffer to the destination texture
//GL.CopyTexSubImage2D(TextureTarget.Texture2D, 0, 0, 0, 0, 0, nbuffersWidth, nbuffersHeight);
//GL.UseProgram(shaderProgram);
////GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0);
//Vector3 offset = new Vector3(1.0f / nbuffersWidth, 1.0f / nbuffersHeight, 0);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "prevLevelMinTexture"), 0);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "prevLevelMaxTexture"), 1);
//GL.Uniform1(GL.GetUniformLocation(shaderProgram, "prevLevel"), 0);
//GL.Uniform3(GL.GetUniformLocation(shaderProgram, "offset"), offset);
//GL.ActiveTexture(TextureUnit.Texture1);
//GL.BindTexture(TextureTarget.Texture2DArray, nBuffersTextureArray);
//GL.ActiveTexture(TextureUnit.Texture0);
//GL.BindTexture(TextureTarget.Texture2D, prevMinTexture);
//GL.Ext.FramebufferTextureLayer(
// FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext,
// nBuffersTextureArray, 0, 1);
//LayerHelper.DrawQuad();
// -- DEBUG --
// the following levels are constructed from the previous ones (with offsets)
GL.UseProgram(shaderProgram);
// (x, y, 0)
// (1,1,0) converted from [width; height] to [0.0; 1.0]^2 texture coordinates
Vector3 offset = new Vector3(1.0f / nbuffersWidth, 1.0f / nbuffersHeight, 0);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "prevLevelTexture"), 0);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2DArray, nBuffersTextureArray);
GL.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureBorderColor, new float[] { 1, 0, 0, 0 });
for (int i = 1; i < LayerCount; i++)
{
GL.Uniform3(GL.GetUniformLocation(shaderProgram, "offset"), offset);
GL.Uniform1(GL.GetUniformLocation(shaderProgram, "prevLevel"), i - 1);
GL.Ext.FramebufferTextureLayer(
FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext,
nBuffersTextureArray, 0, i);
LayerHelper.DrawQuad();
offset *= 2.0f;
}
GL.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureBorderColor, new float[] { 0, 1, 0, 0 });
GL.DepthFunc(DepthFunction.Less);
GL.UseProgram(0);
GL.ActiveTexture(TextureUnit.Texture1);
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, 0);
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0);
GL.PopAttrib(); // ViewportBit
//for (int i = 0; i < LayerCount; i++)
//{
// GL.BindTexture(TextureTarget.Texture2D, nBuffersTextures[i]);
// GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.LinearMipmapLinear);
// GL.Ext.GenerateMipmap(GenerateMipmapTarget.Texture2D);
//}
//GL.BindTexture(TextureTarget.Texture2D, 0);
}