147 lines
3.5 KiB
C++
147 lines
3.5 KiB
C++
#include <azur/gint/render.h>
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uint8_t AZRP_SHADER_CIRCLE = -1;
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static void azrp_shader_circle_configure(void)
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{
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azrp_set_uniforms(AZRP_SHADER_CIRCLE, (void *)azrp_width);
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}
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__attribute__((constructor))
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static void register_shader(void)
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{
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extern azrp_shader_t azrp_shader_circle;
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AZRP_SHADER_CIRCLE = azrp_register_shader(azrp_shader_circle, azrp_shader_circle_configure);
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}
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static int min(int x, int y)
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{
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return (x < y) ? x : y;
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}
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static int max(int x, int y)
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{
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return (x > y) ? x : y;
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}
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//---
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#define TABLE_WIDTH 256
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struct command {
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uint8_t shader_id;
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uint16_t color;
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uint8_t curr_frag;
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uint16_t NbPixels[14]; // Nunmber of pixels in each fragment
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uint16_t DataPixelsX[14*TABLE_WIDTH]; // 14 fragments each able to store as much pixels as width
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uint16_t DataPixelsY[14*TABLE_WIDTH]; // 14 fragments each able to store as much pixels as width
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};
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void AddPixelCircle( int16_t xp, int16_t yp, struct command *cmd )
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{
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if (xp >= 0 && xp < azrp_width && yp >= 0 && yp < azrp_height)
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{
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uint8_t cfrag = yp / azrp_frag_height;
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uint16_t nbpixinfrag = cmd->NbPixels[ cfrag ];
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uint16_t index = cfrag * TABLE_WIDTH + nbpixinfrag;
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cmd->DataPixelsX[ index ] = xp;
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cmd->DataPixelsY[ index ] = yp & 15;
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cmd->NbPixels[ cfrag ]++;
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}
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}
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void azrp_circle(int xc, int yc, uint16_t rad, uint16_t color)
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{
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prof_enter(azrp_perf_cmdgen);
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int xmin = xc - rad;
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int xmax = xc + rad;
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int ymin = yc - rad;
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int ymax = yc + rad;
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// The circle is fully outside the screen
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if ((xmax < 0) || (xmin >= azrp_width) || (ymax < 0) || (ymin >= azrp_height))
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{
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prof_leave(azrp_perf_cmdgen);
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return;
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}
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int ytop = max( ymin, 0 );
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int ybot = min( ymax, azrp_height-1 );
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int frag_first = ytop / azrp_frag_height;
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int frag_last = ybot / azrp_frag_height;
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int frag_count = frag_last - frag_first + 1;
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struct command *cmd = (struct command *) azrp_new_command(sizeof *cmd, frag_first, frag_count);
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if(!cmd) {
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prof_leave(azrp_perf_cmdgen);
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return;
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}
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cmd->shader_id = AZRP_SHADER_CIRCLE;
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cmd->color = color;
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cmd->curr_frag = frag_first;
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// reset the point counters in each cell of the table
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for( int i = 0; i < 14; i++ )
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cmd->NbPixels[i]=0;
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int x = 0;
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int y = rad;
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int m = 5 - 4*rad;
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while (x <= y)
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{
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AddPixelCircle( xc+x, yc+y, cmd );
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AddPixelCircle( xc+y, yc+x, cmd );
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AddPixelCircle( xc-x, yc+y, cmd );
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AddPixelCircle( xc-y, yc+x, cmd );
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AddPixelCircle( xc+x, yc-y, cmd );
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AddPixelCircle( xc+y, yc-x, cmd );
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AddPixelCircle( xc-x, yc-y, cmd );
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AddPixelCircle( xc-y, yc-x, cmd );
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if (m > 0)
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{
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y--;
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m -= 8*y;
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}
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x++;
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m += 8*x + 4;
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}
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prof_leave(azrp_perf_cmdgen);
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}
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void azrp_shader_circle( void *uniforms, void *comnd, void *fragment )
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{
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struct command *cmd = (struct command *) comnd;
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uint16_t *frag = (uint16_t *) fragment;
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uint16_t *taille = (uint16_t *) cmd->NbPixels;
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uint16_t *DX = (uint16_t *) cmd->DataPixelsX;
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uint16_t *DY = (uint16_t *) cmd->DataPixelsY;
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uint16_t nbpix = taille[ cmd->curr_frag ];
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int BaseAdress = cmd->curr_frag * TABLE_WIDTH;
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for( int i = 0; i < nbpix; i++ )
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{
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uint16_t X = DX[ BaseAdress + i ];
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uint16_t Y = DY[ BaseAdress + i ];
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frag[ azrp_width * Y + X ] = cmd->color;
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}
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cmd->curr_frag++;
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} |