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0025414: Visualization - Optimize ray-tracing performance

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This patch increases ray-tracing performance up to 12% in regular mode, and up to 36% in FSAA mode.
This commit is contained in:
dbp 2014-10-23 18:18:24 +04:00 committed by bugmaster
parent 67e36f0c7a
commit 50d0e1cefd
5 changed files with 64 additions and 30 deletions
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23
src/OpenGl/OpenGl_SceneGeometry.cxx
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@ -128,6 +128,29 @@ OpenGl_RaytraceLight::OpenGl_RaytraceLight (const BVH_Vec4f& theDiffuse,
//
}
// =======================================================================
// function : Center
// purpose : Returns centroid position along the given axis
// =======================================================================
Standard_ShortReal OpenGl_TriangleSet::Center (
const Standard_Integer theIndex, const Standard_Integer theAxis) const
{
// Note: Experiments show that the use of the box centroid (instead
// of the triangle centroid) increases render performance up to 12%
const BVH_Vec4i& aTriangle = Elements[theIndex];
const Standard_ShortReal aVertex0 =
BVH::VecComp<Standard_ShortReal, 3>::Get (Vertices[aTriangle.x()], theAxis);
const Standard_ShortReal aVertex1 =
BVH::VecComp<Standard_ShortReal, 3>::Get (Vertices[aTriangle.y()], theAxis);
const Standard_ShortReal aVertex2 =
BVH::VecComp<Standard_ShortReal, 3>::Get (Vertices[aTriangle.z()], theAxis);
return (Min (Min (aVertex0, aVertex1), aVertex2) +
Max (Max (aVertex0, aVertex1), aVertex2)) * 0.5f;
}
// =======================================================================
// function : Box
// purpose : Returns AABB of primitive set

5
src/OpenGl/OpenGl_SceneGeometry.hxx
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@ -185,6 +185,9 @@ public:
//! Returns AABB of primitive set.
BVH_BoxNt Box() const;
//! Returns centroid position along the given axis.
Standard_ShortReal Center (const Standard_Integer theIndex, const Standard_Integer theAxis) const;
public:
BVH_Array3f Normals; //!< Array of vertex normals.
@ -193,7 +196,7 @@ public:
private:
Standard_Size myArrayID; //!< Id of associated primitive array.
Standard_Size myArrayID; //!< ID of associated primitive array.
};

32
src/OpenGl/OpenGl_Workspace_Raytrace.cxx
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@ -2241,38 +2241,42 @@ Standard_Boolean OpenGl_Workspace::RunRaytraceShaders (const Graphic3d_CView& th
1, // ID of FSAA program
myPostFSAAProgram);
const Standard_ShortReal aMaxOffset = 0.559017f;
const Standard_ShortReal aMinOffset = 0.186339f;
myGlContext->core20fwd->glEnableVertexAttribArray (Graphic3d_TOA_POS);
myGlContext->core20fwd->glVertexAttribPointer (Graphic3d_TOA_POS, 3, GL_FLOAT, GL_FALSE, 0, NULL);
// Perform multi-pass adaptive FSAA using ping-pong technique
// rotated grid AA always uses 4 samples
for (Standard_Integer anIt = 0; anIt < 4; ++anIt)
// Perform multi-pass adaptive FSAA using ping-pong technique.
// We use 'FLIPTRI' sampling pattern changing for every pixel
// (3 additional samples per pixel, the 1st sample is already
// available from initial ray-traced image).
for (Standard_Integer anIt = 1; anIt < 4; ++anIt)
{
GLfloat aOffsetX = 1.f / theSizeX;
GLfloat aOffsetY = 1.f / theSizeY;
if (anIt < 2)
if (anIt == 1)
{
aOffsetX *= anIt < 1 ? aMinOffset : -aMaxOffset;
aOffsetY *= anIt < 1 ? aMaxOffset : aMinOffset;
aOffsetX *= -0.55f;
aOffsetY *= 0.55f;
}
else
else if (anIt == 2)
{
aOffsetX *= anIt > 2 ? aMaxOffset : -aMinOffset;
aOffsetY *= anIt > 2 ? -aMinOffset : -aMaxOffset;
aOffsetX *= 0.00f;
aOffsetY *= -0.55f;
}
else if (anIt == 3)
{
aOffsetX *= 0.55f;
aOffsetY *= 0.00f;
}
myPostFSAAProgram->SetUniform (myGlContext,
myUniformLocations[1][OpenGl_RT_uSamples], anIt + 2);
myUniformLocations[1][OpenGl_RT_uSamples], anIt + 1);
myPostFSAAProgram->SetUniform (myGlContext,
myUniformLocations[1][OpenGl_RT_uOffsetX], aOffsetX);
myPostFSAAProgram->SetUniform (myGlContext,
myUniformLocations[1][OpenGl_RT_uOffsetY], aOffsetY);
Handle(OpenGl_FrameBuffer)& aFramebuffer = anIt % 2 ? myRaytraceFBO1 : myRaytraceFBO2;
Handle(OpenGl_FrameBuffer)& aFramebuffer = anIt % 2 ? myRaytraceFBO2 : myRaytraceFBO1;
if (anIt == 3) // disable FBO on last iteration
{

5
src/Shaders/RaytraceBase.fs
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@ -5,6 +5,11 @@
//! Normalized pixel coordinates.
in vec2 vPixel;
//! Sub-pixel offset in X direction for FSAA.
uniform float uOffsetX = 0.f;
//! Sub-pixel offset in Y direction for FSAA.
uniform float uOffsetY = 0.f;
//! Origin of viewing ray in left-top corner.
uniform vec3 uOriginLT;
//! Origin of viewing ray in left-bottom corner.

11
src/Shaders/RaytraceSmooth.fs
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@ -4,11 +4,6 @@ uniform sampler2D uFSAAInputTexture;
//! Number of accumulated FSAA samples.
uniform int uSamples;
//! Sub-pixel offset in X direction for FSAA.
uniform float uOffsetX;
//! Sub-pixel offset in Y direction for FSAA.
uniform float uOffsetY;
//! Output pixel color.
out vec4 OutColor;
@ -25,6 +20,10 @@ void main (void)
int aPixelX = int (gl_FragCoord.x);
int aPixelY = int (gl_FragCoord.y);
// Adjust FLIPTRI pattern used for adaptive FSAA
float anOffsetX = mix (uOffsetX, -uOffsetX, float (aPixelX % 2));
float anOffsetY = mix (uOffsetY, -uOffsetY, float (aPixelY % 2));
vec4 aClr0 = texelFetch (uFSAAInputTexture, ivec2 (aPixelX + 0, aPixelY + 0), 0);
vec4 aClr1 = texelFetch (uFSAAInputTexture, ivec2 (aPixelX + 0, aPixelY - 1), 0);
vec4 aClr2 = texelFetch (uFSAAInputTexture, ivec2 (aPixelX + 0, aPixelY + 1), 0);
@ -64,7 +63,7 @@ void main (void)
if (aRender)
{
SRay aRay = GenerateRay (vPixel + vec2 (uOffsetX, uOffsetY));
SRay aRay = GenerateRay (vPixel + vec2 (anOffsetX, anOffsetY));
vec3 aInvDirect = 1.f / max (abs (aRay.Direct), SMALL);