#ifndef _RRRASTERIZER_HPP
#define _RRRASTERIZER_HPP
/*-------------------------------------------------------------------------
* drawElements Quality Program Reference Renderer
* -----------------------------------------------
*
* Copyright 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*//*!
* \file
* \brief Reference rasterizer
*//*--------------------------------------------------------------------*/
#include "rrDefs.hpp"
#include "tcuVector.hpp"
#include "rrRenderState.hpp"
#include "rrFragmentPacket.hpp"
namespace rr
{
//! Rasterizer configuration
enum
{
RASTERIZER_SUBPIXEL_BITS = 8,
RASTERIZER_MAX_SAMPLES_PER_FRAGMENT = 16
};
//! Get coverage bit value.
inline deUint64 getCoverageBit (int numSamples, int x, int y, int sampleNdx)
{
const int numBits = sizeof(deUint64)*8;
const int maxSamples = numBits/4;
DE_STATIC_ASSERT(maxSamples >= RASTERIZER_MAX_SAMPLES_PER_FRAGMENT);
DE_ASSERT(de::inRange(numSamples, 1, maxSamples) && de::inBounds(x, 0, 2) && de::inBounds(y, 0, 2));
return 1ull << ((x*2 + y)*numSamples + sampleNdx);
}
//! Get all sample bits for fragment
inline deUint64 getCoverageFragmentSampleBits (int numSamples, int x, int y)
{
DE_ASSERT(de::inBounds(x, 0, 2) && de::inBounds(y, 0, 2));
const deUint64 fragMask = (1ull << numSamples) - 1;
return fragMask << (x*2 + y)*numSamples;
}
//! Set bit in coverage mask.
inline deUint64 setCoverageValue (deUint64 mask, int numSamples, int x, int y, int sampleNdx, bool val)
{
const deUint64 bit = getCoverageBit(numSamples, x, y, sampleNdx);
return val ? (mask | bit) : (mask & ~bit);
}
//! Get coverage bit value in mask.
inline bool getCoverageValue (deUint64 mask, int numSamples, int x, int y, int sampleNdx)
{
return (mask & getCoverageBit(numSamples, x, y, sampleNdx)) != 0;
}
//! Test if any sample for fragment is live
inline bool getCoverageAnyFragmentSampleLive (deUint64 mask, int numSamples, int x, int y)
{
return (mask & getCoverageFragmentSampleBits(numSamples, x, y)) != 0;
}
//! Get position of first coverage bit of fragment - equivalent to deClz64(getCoverageFragmentSampleBits(numSamples, x, y)).
inline int getCoverageOffset (int numSamples, int x, int y)
{
return (x*2 + y)*numSamples;
}
/*--------------------------------------------------------------------*//*!
* \brief Edge function
*
* Edge function can be evaluated for point P (in fixed-point coordinates
* with SUBPIXEL_BITS fractional part) by computing
* D = a*Px + b*Py + c
*
* D will be fixed-point value where lower (SUBPIXEL_BITS*2) bits will
* be fractional part.
*
* a and b are stored with SUBPIXEL_BITS fractional part, while c is stored
* with SUBPIXEL_BITS*2 fractional bits.
*//*--------------------------------------------------------------------*/
struct EdgeFunction
{
inline EdgeFunction (void) : a(0), b(0), c(0), inclusive(false) {}
deInt64 a;
deInt64 b;
deInt64 c;
bool inclusive; //!< True if edge is inclusive according to fill rules.
};
/*--------------------------------------------------------------------*//*!
* \brief Triangle rasterizer
*
* Triangle rasterizer implements following features:
* - Rasterization using fixed-point coordinates
* - 1, 4, and 16 -sample rasterization
* - Depth interpolation
* - Perspective-correct barycentric computation for interpolation
* - Visible face determination
*
* It does not (and will not) implement following:
* - Triangle setup
* - Clipping
* - Degenerate elimination
* - Coordinate transformation (inputs are in screen-space)
* - Culling - logic can be implemented outside by querying visible face
* - Scissoring (this can be done by controlling viewport rectangle)
* - Any per-fragment operations
*//*--------------------------------------------------------------------*/
class TriangleRasterizer
{
public:
TriangleRasterizer (const tcu::IVec4& viewport, const int numSamples, const RasterizationState& state);
void init (const tcu::Vec4& v0, const tcu::Vec4& v1, const tcu::Vec4& v2);
// Following functions are only available after init()
FaceType getVisibleFace (void) const { return m_face; }
void rasterize (FragmentPacket* const fragmentPackets, float* const depthValues, const int maxFragmentPackets, int& numPacketsRasterized);
private:
void rasterizeSingleSample (FragmentPacket* const fragmentPackets, float* const depthValues, const int maxFragmentPackets, int& numPacketsRasterized);
template<int NumSamples>
void rasterizeMultiSample (FragmentPacket* const fragmentPackets, float* const depthValues, const int maxFragmentPackets, int& numPacketsRasterized);
// Constant rasterization state.
const tcu::IVec4 m_viewport;
const int m_numSamples;
const Winding m_winding;
const HorizontalFill m_horizontalFill;
const VerticalFill m_verticalFill;
// Per-triangle rasterization state.
tcu::Vec4 m_v0;
tcu::Vec4 m_v1;
tcu::Vec4 m_v2;
EdgeFunction m_edge01;
EdgeFunction m_edge12;
EdgeFunction m_edge20;
FaceType m_face; //!< Triangle orientation, eg. visible face.
tcu::IVec2 m_bboxMin; //!< Bounding box min (inclusive).
tcu::IVec2 m_bboxMax; //!< Bounding box max (inclusive).
tcu::IVec2 m_curPos; //!< Current rasterization position.
};
/*--------------------------------------------------------------------*//*!
* \brief Single sample line rasterizer
*
* Triangle rasterizer implements following features:
* - Rasterization using fixed-point coordinates
* - Depth interpolation
* - Perspective-correct interpolation
*
* It does not (and will not) implement following:
* - Clipping
* - Multisampled line rasterization
*//*--------------------------------------------------------------------*/
class SingleSampleLineRasterizer
{
public:
SingleSampleLineRasterizer (const tcu::IVec4& viewport);
~SingleSampleLineRasterizer ();
void init (const tcu::Vec4& v0, const tcu::Vec4& v1, float lineWidth);
// only available after init()
void rasterize (FragmentPacket* const fragmentPackets, float* const depthValues, const int maxFragmentPackets, int& numPacketsRasterized);
private:
SingleSampleLineRasterizer (const SingleSampleLineRasterizer&); // not allowed
SingleSampleLineRasterizer& operator= (const SingleSampleLineRasterizer&); // not allowed
// Constant rasterization state.
const tcu::IVec4 m_viewport;
// Per-line rasterization state.
tcu::Vec4 m_v0;
tcu::Vec4 m_v1;
tcu::IVec2 m_bboxMin; //!< Bounding box min (inclusive).
tcu::IVec2 m_bboxMax; //!< Bounding box max (inclusive).
tcu::IVec2 m_curPos; //!< Current rasterization position.
deInt32 m_curRowFragment; //!< Current rasterization position of one fragment in column of lineWidth fragments
float m_lineWidth;
};
/*--------------------------------------------------------------------*//*!
* \brief Multisampled line rasterizer
*
* Triangle rasterizer implements following features:
* - Rasterization using fixed-point coordinates
* - Depth interpolation
* - Perspective-correct interpolation
*
* It does not (and will not) implement following:
* - Clipping
* - Aliased line rasterization
*//*--------------------------------------------------------------------*/
class MultiSampleLineRasterizer
{
public:
MultiSampleLineRasterizer (const int numSamples, const tcu::IVec4& viewport);
~MultiSampleLineRasterizer ();
void init (const tcu::Vec4& v0, const tcu::Vec4& v1, float lineWidth);
// only available after init()
void rasterize (FragmentPacket* const fragmentPackets, float* const depthValues, const int maxFragmentPackets, int& numPacketsRasterized);
private:
MultiSampleLineRasterizer (const MultiSampleLineRasterizer&); // not allowed
MultiSampleLineRasterizer& operator= (const MultiSampleLineRasterizer&); // not allowed
// Constant rasterization state.
const int m_numSamples;
// Per-line rasterization state.
TriangleRasterizer m_triangleRasterizer0; //!< not in array because we want to initialize these in the initialization list
TriangleRasterizer m_triangleRasterizer1;
};
} // rr
#endif // _RRRASTERIZER_HPP