95 lines
2.3 KiB
C++
95 lines
2.3 KiB
C++
#include "../include/drawstuff.h"
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#include "../parameters.h"
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#include <gint/display.h>
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#include "../fixed.h"
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void gint_dhline(int x1, int x2, int y, uint16_t color)
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{
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if((uint)y >= 224) return;
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if(x1 > x2) swap(x1, x2);
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if(x1 >= 396 || x2 < 0) return;
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if(x1 < 0) x1 = 0;
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if(x2 >= 396) x2 = 395;
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int offset = 396 * y;
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gint_vram[offset + x1] = color;
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gint_vram[offset + x2] = color;
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x1 = x1 + (x1 & 1);
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x2 = (x2 + 1) & ~1;
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uint32_t *start = (void *)(gint_vram + offset + x1);
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uint32_t *end = (void *)(gint_vram + offset + x2);
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uint32_t op = (color << 16) | color;
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while(end > start) *--end = op;
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};
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void drawGrass( int y1, int y2, uint8_t R, uint8_t G, uint8_t B, uint8_t A )
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{
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uint16_t color = C_RGB(R,G,B);
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for (int y=y1; y<=y2; y++) gint_dhline( 0, SCREEN_WIDTH, y, color );
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};
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void drawPolygon( int x1min, int x1max, int y1, int x2min, int x2max, int y2, uint8_t R, uint8_t G, uint8_t B, uint8_t A )
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{
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/*
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uint16_t color = C_RGB(R,G,B);
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float Ddeltay = 1.0f / (float) (y2-y1);
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float deltay=0.0f;
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for (int y=y1; y<=y2; y++)
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{
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if (y>0 && y<SCREEN_HEIGHT)
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{
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float xmin = (float) x1min + (float) (x2min-x1min)*deltay;
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float xmax = (float) x1max + (float) (x2max-x1max)*deltay;
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gint_dhline( (int) xmin, (int) xmax, y, color );
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}
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deltay+=Ddeltay;
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}
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*/
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uint16_t color = C_RGB(R,G,B);
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if (y1==y2)
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{
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gint_dhline( x1min, x1max, y1, color );
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return;
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}
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//fixed_t Ddeltay = fdiv(fix(1), fix(y2-y1));
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//fixed_t deltay = 0;
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fixed_t deltay = fdiv(fix(1), fix(y2-y1));
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fixed_t xmin = fix(x1min);
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fixed_t xmax = fix(x1max);
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fixed_t dxmin = fix(x2min-x1min);
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fixed_t dxmax = fix(x2max-x1max);
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for (int y=y1; y<=y2; y++)
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{
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if (y>0 && y<SCREEN_HEIGHT)
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{
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xmin += fmul(deltay, dxmin);
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xmax += fmul(deltay, dxmax);
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gint_dhline( fround(xmin), fround(xmax), y, color );
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}
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//deltay+=Ddeltay;
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}
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};
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void drawSky( void )
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{
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dclear( C_RGB(0,45,255) );
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};
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void drawSky( int ymin, int ymax )
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{
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uint16_t color = C_RGB(0,45,255);
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for(int y=ymin; y<=ymax; y++ )
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gint_dhline( 0, SCREEN_WIDTH, y, color );
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};
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