c - CHIP-8 SDL rendering problems -


i have coded chip-8 emulator.whatever do, seems cannot show pixels on screen.the weird thing have checked code, top-bottom 2 days already, , there not seem problem.it reads .rom file memory, , fetches op code correctly.

here source code:

                sdl_setrenderdrawcolor( renderer, 0, 0, 0, sdl_alpha_opaque );                 sdl_renderclear(renderer);                 uint32_t pixels[(window_width / 10) * (window_height / 10)];                 uint16_t i;                 for(i = 0; < 64*32; i++){                     pixels[i] = (0x00ffffff * display[i]) | 0xff000000;                 }                 //upload pixels texture                 sdl_updatetexture(tex,null,pixels, 64 * sizeof(uint32_t));                 //now texture screen                 sdl_rendercopy(renderer,tex,null,null);                 sdl_renderpresent(renderer); // update screen                 ch8.drawf = false;  uint16_t x = ch8->v[((ch8->opcode & 0x0f00) >> 8)];                 uint16_t y = ch8->v[((ch8->opcode & 0x00f0) >> 4)];                 uint8_t n = (ch8->opcode & 0x000f);                 for(i = 0; < n; i++) {                     uint8_t pixel= memory[ch8->i.word + i];                     for(j = 0; j < 8; j++) {                         if((pixel & (0x80 >> j)) != 0){                             if(display[x + j  + ((y + i) * 64)] == 1) {                                 ch8->v[0xf] = 1;                             }                             display[x + j  + ((y + i) * 64)] ^= 1;                         }                     }                 }

so basically, problem @ init() function.i using, sdl_createwindow , sdl_createrenderer,but i'm using ,sdl_createwindowandrenderer, takes pointers pointers of sdl_window , sdl_renderer instead of pointer char , pointer window.

also there 3 problems fixed. 1.i adding + 0x200 nnn opcodes,because @ firstly thought nnn in rom's relative 0, removed +0x200 each xnnn opcode.also forgot * @ sdl_texture* tex, supposed sdl_texture** tex, merely changing address local pointer poiting too... 2.at opcode 2nnn, instead of (ch8->sp) = ch8->opcode & 0x0fff; its(ch8->sp) = ch8->pc.word; 3.at opcode fx65 <= ((ch8->opcode & 0x0f00) >> 8)

basically, differences between sdl_createwindowandrenderer , sdl_createwindow&sdl_createrenderer had me confused, should had check'd documentation first.

now need make emulator redraw changed pixels, make emulator play sound.


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