93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
#include <uvm/syscalls.h>
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#include <uvm/utils.h>
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#include "/home/sforman/src/Joypy/implementations/uvm-ncc/font/font.h"
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#define RED 0xFF_00_00
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#define GREEN 0x00_FF_00
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size_t FRAME_WIDTH = 640;
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size_t FRAME_HEIGHT = 480;
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u32 frame_buffer[307200];
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int wid;
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void
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draw_char(u8 ch, u64 dest_x, u64 dest_y)
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{
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u32* dest = frame_buffer + FRAME_WIDTH * dest_y + dest_x;
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u32* character_data = font_Inconsolata_14_data[ch];
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for (size_t x = 0; x < font_Inconsolata_14_width; ++x) {
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for (size_t y = 0; y < font_Inconsolata_14_height; ++y) {
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u32* pix_ptr = dest + x + FRAME_WIDTH * y;
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u32 pixel = character_data[x + font_Inconsolata_14_width * y];
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u8 alpha = pixel >> 24;
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if (!alpha) { // no alpha
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continue;
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}
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if (0xFF == alpha) {
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*pix_ptr = pixel;
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continue;
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}
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u32 dest_pixel = *pix_ptr;
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u8 unalpha = 0xFF - alpha;
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u8 red = (((dest_pixel >> 16) & 255) * unalpha + ((pixel >> 16) & 255) * alpha) / 0xff;
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u8 green = (((dest_pixel >> 8) & 255) * unalpha + ((pixel >> 8) & 255) * alpha) / 0xff;
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u8 blue = ((dest_pixel & 255) * unalpha + (pixel & 255) * alpha) / 0xff;
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*pix_ptr = (alpha << 24) | (red << 16) | (green << 8) | blue;
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}
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}
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}
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void
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draw_background()
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{
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// Clear the screen
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memset(frame_buffer, 0, sizeof(frame_buffer));
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for (size_t x = 0; x < FRAME_WIDTH; ++x) {
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for (size_t y = 0; y < FRAME_HEIGHT; ++y) {
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u32* pix_ptr = frame_buffer + FRAME_WIDTH * y + x;
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u8 blue = x & 255;
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u8 green = y & 255;
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u8 red = (x + y + 128) & 255;
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u8 alpha = 123;
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*pix_ptr = (alpha << 24) | (red << 16) | (green << 8) | blue;
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}
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}
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window_draw_frame(wid, frame_buffer);
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// This rate of refresh of the whole screen caused ~60% CPU use. :(
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// time_delay_cb(100, draw_background);
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}
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//void
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//keydown(u64 window_id, u16 keycode)
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//{
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// window_draw_frame(window_id, frame_buffer);
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//}
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void
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mousemove(u64 window_id, u64 new_x, u64 new_y)
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{
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u32* pix_ptr = frame_buffer + FRAME_WIDTH * new_y + new_x;
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*pix_ptr = GREEN;
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window_draw_frame(window_id, frame_buffer);
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}
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void
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main()
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{
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init_font_data();
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wid = window_create(FRAME_WIDTH, FRAME_HEIGHT, "Bouncing Ball Example", 0);
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draw_background();
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for (size_t ch = 0; ch < 94; ++ch) {
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draw_char(ch, (ch % 26) * font_Inconsolata_14_width, (ch / 26) * font_Inconsolata_14_height);
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}
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window_draw_frame(wid, frame_buffer);
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//window_on_keydown(wid, keydown);
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window_on_mousemove(wid, mousemove);
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enable_event_loop();
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}
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