269 lines
6.9 KiB
C++
269 lines
6.9 KiB
C++
/*
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* \brief Functor for drawing a sky texture into a surface
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* \author Norman Feske
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* \date 2005-10-24
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*/
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/*
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* Copyright (C) 2006-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__SCOUT_GFX__SKY_TEXTURE_PAINTER_H_
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#define _INCLUDE__SCOUT_GFX__SKY_TEXTURE_PAINTER_H_
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#include <os/surface.h>
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#include <util/color.h>
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struct Sky_texture_painter
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{
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typedef Genode::Surface_base::Area Area;
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typedef Genode::Surface_base::Rect Rect;
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typedef Genode::Color Color;
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template <typename PT>
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static void _compose(PT *dst, int dst_w, int dst_h, int x_start, int x_end,
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short const src1[], int src1_y,
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short const src2[], int src2_y,
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short const src3[], int src3_y, int src_w, int src_h,
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PT const coltab[])
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{
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for (int k = 0; k <= x_end; k += src_w) {
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int x_offset = Genode::max(0, x_start - k);
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int x_max = Genode::min(x_end - k, src_w - 1);
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for (int j = 0; j < dst_h; j++) {
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short const *s1 = src1 + x_offset + ((src1_y + j)%src_h)*src_w;
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short const *s2 = src2 + x_offset + ((src2_y + j)%src_h)*src_w;
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short const *s3 = src3 + x_offset + ((src3_y + j)%src_h)*src_w;
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PT *d = dst + x_offset + j*dst_w + k;
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for (int i = x_offset; i <= x_max; i++)
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*d++ = coltab[*s1++ + *s2++ + *s3++];
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}
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}
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}
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class Sky_texture_base
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{
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protected:
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virtual ~Sky_texture_base() { }
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static void _brew_texture(short tmp[], short tmp2[], short dst[], int w, int h,
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int lf_start, int lf_end, int lf_incr, int lf_mul,
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int hf_val, int hf_mul);
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/**
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* Multiply buffer values with 24:8 fixpoint value
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*/
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static void _multiply_buf(short dst[], int len, int factor)
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{
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for (int i = 0; i < len; i++)
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dst[i] = (dst[i]*factor)>>8;
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}
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static inline int _mix_channel(int value1, int value2, int alpha)
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{
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return (value1*(255 - alpha) + value2*alpha)>>8;
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}
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};
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template <typename PT>
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class Sky_texture : public Sky_texture_base
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{
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private:
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Area _size;
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public:
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Sky_texture(Area size) : _size(size) { }
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virtual ~Sky_texture() { }
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virtual PT const *fallback() const = 0;
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virtual short const *buf(unsigned i) const = 0;
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virtual PT const *coltab() const = 0;
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Area size() const { return _size; }
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};
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/*
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* The texture is composed of four generated 4-bit maps based on bicubic
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* interpolation of some noise at different frequencies. At runtime, we
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* overlay (add their values) the generated map and use the result as index
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* of a color table.
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*/
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template <typename PT, unsigned TW, unsigned TH>
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class Static_sky_texture : public Sky_texture<PT>
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{
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private:
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short _bufs[3][TH][TW];
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short _buf[TH][TW];
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short _tmp[TH][TW];
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PT _coltab[16*16*16];
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PT _fallback[TH][TW]; /* fallback texture */
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using Sky_texture<PT>::_mix_channel;
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using Sky_texture<PT>::_brew_texture;
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using Sky_texture<PT>::_multiply_buf;
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public:
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/**
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* Create 3D color table
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*/
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static void _create_coltab(PT *dst, Color c0, Color c1, Color c2, Color bg)
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{
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for (int i = 0; i < 16; i++)
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for (int j = 0; j < 16; j++)
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for (int k = 0; k < 16; k++) {
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int r = bg.r;
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int g = bg.g;
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int b = bg.b;
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r = _mix_channel(r, c2.r, k*16);
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g = _mix_channel(g, c2.g, k*16);
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b = _mix_channel(b, c2.b, k*16);
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r = _mix_channel(r, c1.r, j*16);
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g = _mix_channel(g, c1.g, j*16);
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b = _mix_channel(b, c1.b, j*16);
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r = _mix_channel(r, c0.r, i*8);
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g = _mix_channel(g, c0.g, i*8);
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b = _mix_channel(b, c0.b, i*8);
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int v = (((i ^ j ^ k)<<1) & 0xff) + 128 + 64;
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r = (r + v)>>1;
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g = (g + v)>>1;
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b = (b + v)>>1;
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v = 180;
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r = (v*r + (255 - v)*255)>>8;
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g = (v*g + (255 - v)*255)>>8;
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b = (v*b + (255 - v)*255)>>8;
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dst[(k<<8) + (j<<4) + i].rgba(r, g, b);
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}
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}
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/**
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* Constructor
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*/
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Static_sky_texture()
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:
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Sky_texture<PT>(Area(TW, TH))
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{
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/* create nice-looking textures */
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_brew_texture(_tmp[0], _buf[0], _bufs[0][0], TW, TH, 3, 7, 1, 30, 30, 10);
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_brew_texture(_tmp[0], _buf[0], _bufs[1][0], TW, TH, 3, 16, 3, 50, 40, 30);
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_brew_texture(_tmp[0], _buf[0], _bufs[2][0], TW, TH, 5, 40, 11, 70, 0, 0);
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/* shift texture 1 to bits 4 to 7 */
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_multiply_buf(_bufs[1][0], TW*TH, 16*256);
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/* shift texture 2 to bits 8 to 11 */
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_multiply_buf(_bufs[2][0], TW*TH, 16*16*256);
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/* create color table */
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_create_coltab(_coltab, Color(255, 255, 255),
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Color( 0, 0, 0),
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Color(255, 255, 255),
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Color( 80, 88, 112));
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/* create fallback texture */
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_compose(_fallback[0], TW, TH, 0, TW - 1,
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_bufs[0][0], 0, _bufs[1][0], 0, _bufs[2][0], 0,
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TW, TH, _coltab);
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}
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PT const *fallback() const override { return _fallback[0]; }
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short const *buf(unsigned i) const override
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{
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if (i >= 3)
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return 0;
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return _bufs[i][0];
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}
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PT const *coltab() const override { return _coltab; }
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};
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template <typename PT>
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static void _copy(PT *dst, int dst_w, int dst_h, int x_start, int x_end,
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PT const *src, int src_y, int src_w, int src_h)
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{
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for (int k = 0; k <= x_end; k += src_w) {
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int x_offset = Genode::max(0, x_start - k);
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int x_max = Genode::min(x_end - k, src_w - 1);
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for (int j = 0; j < dst_h; j++) {
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PT const *s = src + x_offset + ((src_y + j)%src_h)*src_w;
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PT *d = dst + x_offset + j*dst_w + k;
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if (x_max - x_offset >= 0)
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Genode::memcpy(d, s, (x_max - x_offset + 1)*sizeof(PT));
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}
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}
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}
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template <typename PT>
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static inline void paint(Genode::Surface<PT> &surface, int py,
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Sky_texture_base const &texture_base,
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bool detail)
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{
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PT *addr = surface.addr();
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if (!addr) return;
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Sky_texture<PT> const &texture = static_cast<Sky_texture<PT> const &>(texture_base);
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int cx1 = surface.clip().x1();
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int cy1 = surface.clip().y1();
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int cx2 = surface.clip().x2();
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int cy2 = surface.clip().y2();
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int v = -py;
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int y0 = cy1 + v;
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int y1 = cy1 + (( (5*v)/16)%texture.size().h());
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int y2 = cy1 + (((11*v)/16)%texture.size().h());
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addr += cy1*surface.size().w();
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if (detail == false) {
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_copy(addr, surface.size().w(), cy2 - cy1 + 1, cx1, cx2,
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texture.fallback(), cy1 - py, texture.size().w(), texture.size().h());
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return;
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}
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_compose(addr, surface.size().w(), cy2 - cy1 + 1, cx1, cx2,
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texture.buf(0), y0, texture.buf(1), y1, texture.buf(2), y2,
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texture.size().w(), texture.size().h(), texture.coltab());
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surface.flush_pixels(surface.clip());
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}
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};
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#endif /* _INCLUDE__SCOUT_GFX__SKY_TEXTURE_PAINTER_H_ */
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