86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
#ifndef TERRAINRASTERIZER_H
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#define TERRAINRASTERIZER_H
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#include "software_global.h"
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#include "Rasterizer.h"
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#include "Vector3.h"
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namespace paysages {
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namespace software {
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class SOFTWARESHARED_EXPORT TerrainRasterizer : public Rasterizer {
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public:
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typedef struct {
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Vector3 point_nw;
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Vector3 point_sw;
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Vector3 point_se;
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Vector3 point_ne;
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int detail_hint;
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} TerrainChunkInfo;
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public:
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TerrainRasterizer(SoftwareRenderer *renderer, RenderProgress *progress, unsigned short client_id);
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/**
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* Set the rasterization quality.
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*
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* base_chunk_size - Size of chunks near the camera
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* detail_factor - Precision factor of a chunk's tessellation, depending on screen coverage
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* max_chunk_detail - Maximal tessellation of chunks
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*/
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void setQuality(double base_chunk_size, double detail_factor, int max_chunk_detail);
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virtual void setQuality(double factor) override;
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virtual int prepareRasterization() override;
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virtual void rasterizeToCanvas(CanvasPortion *canvas) override;
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virtual Color shadeFragment(const CanvasFragment &fragment, const CanvasFragment *previous) const override;
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protected:
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/**
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* Add a vertical offset to rasterized polygons.
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*
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* This may be used to rasterize a covering layer on top of ground.
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*/
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void setYOffset(double offset);
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private:
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/**
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* Method called for each chunk tessellated by performTessellation.
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*/
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void processChunk(CanvasPortion *canvas, TerrainChunkInfo *chunk);
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/**
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* Tessellate the terrain, calling processChunk for each chunk.
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*
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* The terrain will be broken in chunks, most detailed near the camera.
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*
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* Return the number of quads that has been pushed.
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*
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* 'canvas' may be NULL to only simulate the tessellation.
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*/
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int performTessellation(CanvasPortion *canvas, bool displaced);
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/**
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* Tessellate a terrain chunk, pushing the quads in the render area.
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*/
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void tessellateChunk(CanvasPortion *canvas, TerrainChunkInfo *chunk, int detail);
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void renderQuad(CanvasPortion *canvas, double x, double z, double size, double water_height);
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void getChunk(SoftwareRenderer *renderer, TerrainRasterizer::TerrainChunkInfo *chunk, double x, double z,
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double size, int displaced);
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private:
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double yoffset;
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// Quality control
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double base_chunk_size;
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double detail_factor;
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int max_chunk_detail;
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};
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}
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}
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#endif // TERRAINRASTERIZER_H
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