45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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*
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* Graphics library
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*/
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#include <syscall.h>
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#include <stdint.h>
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#include "graphics.h"
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DEFN_SYSCALL0(getgraphicsaddress, 11);
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DEFN_SYSCALL1(kbd_mode, 12, int);
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DEFN_SYSCALL0(kbd_get, 13);
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DEFN_SYSCALL1(setgraphicsoffset, 16, int);
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DEFN_SYSCALL0(getgraphicswidth, 18);
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DEFN_SYSCALL0(getgraphicsheight, 19);
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DEFN_SYSCALL0(getgraphicsdepth, 20);
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uint16_t graphics_width = 0;
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uint16_t graphics_height = 0;
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uint16_t graphics_depth = 0;
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/* Pointer to graphics memory */
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uint8_t * gfx_mem = 0;
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void init_graphics() {
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graphics_width = syscall_getgraphicswidth();
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graphics_height = syscall_getgraphicsheight();
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graphics_depth = syscall_getgraphicsdepth();
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gfx_mem = (void *)syscall_getgraphicsaddress();
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}
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uint32_t rgb(uint8_t r, uint8_t g, uint8_t b) {
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return 0xFF000000 + (r * 0x10000) + (g * 0x100) + (b * 0x1);
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}
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uint32_t alpha_blend(uint32_t bottom, uint32_t top, uint32_t mask) {
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float a = _RED(mask) / 256.0;
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uint8_t red = _RED(bottom) * (1.0 - a) + _RED(top) * a;
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uint8_t gre = _GRE(bottom) * (1.0 - a) + _GRE(top) * a;
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uint8_t blu = _BLU(bottom) * (1.0 - a) + _BLU(top) * a;
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return rgb(red,gre,blu);
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}
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