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almost there, tile ram is empty for some reason

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This commit is contained in:
Matthew Laux 2022-07-09 23:45:00 -05:00
parent eb779f3690
commit 9601b9f7da
3 changed files with 43 additions and 11 deletions
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21
cli/imgui_example.cpp
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@ -48,14 +48,14 @@ GLuint make_output_texture() {
return image_texture;
}
unsigned char output_image[160 * 144 * 4];
unsigned char output_image[256 * 256 * 4];
void convert_output(struct lcd *lcd) {
int x, y;
int out_index = 0;
for (y = 0; y < 144; y++) {
for (x = 0; x < 160; x++) {
int val = lcd->pixels[y * 160 + x];
for (y = 0; y < 256; y++) {
for (x = 0; x < 256; x++) {
int val = lcd->buf[y * 256 + x];
int fill = val ? 255 : 0;
output_image[out_index++] = val;
output_image[out_index++] = val;
@ -77,10 +77,10 @@ void fill_memory_editor(struct dmg *dmg)
// Main code
int main(int argc, char *argv[])
{
struct cpu cpu;
struct rom rom;
struct dmg dmg;
struct lcd lcd;
struct cpu cpu = { 0 };
struct rom rom = { 0 };
struct dmg dmg = { 0 };
struct lcd lcd = { 0 };
int executed;
@ -237,8 +237,8 @@ int main(int argc, char *argv[])
convert_output(dmg.lcd);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 160, 144, 0, GL_RGBA, GL_UNSIGNED_BYTE, output_image);
ImGui::Image((void*)(intptr_t) texture, ImVec2(160, 144));
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, output_image);
ImGui::Image((void*)(intptr_t) texture, ImVec2(256, 256));
ImGui::End();
}
@ -246,6 +246,7 @@ int main(int argc, char *argv[])
fill_memory_editor(&dmg);
editor.DrawWindow("Memory", full_address_space, 0x10000, 0x0000);
editor.DrawWindow("LCD", dmg.lcd->buf, 0x2000, 0);
// Rendering
ImGui::Render();

31
src/dmg.c
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@ -1,4 +1,5 @@
#include <stdio.h>
#include <string.h>
#include "cpu.h"
#include "rom.h"
@ -82,6 +83,36 @@ void dmg_step(void *_dmg)
if (next_scanline == 144) {
// vblank has started, draw all the stuff from ram into the lcd
int lcdc = lcd_read(dmg->lcd, REG_LCDC);
int bg_base = (lcdc & LCDC_BG_TILE_MAP) ? 0x9c00 : 0x9800;
int window_base = (lcdc & LCDC_WINDOW_TILE_MAP) ? 0x9c00 : 0x9800;
int use_unsigned = lcdc & LCDC_BG_TILE_DATA;
int tilebase = use_unsigned ? 0x8000 : 0x9000;
printf("base is %04x\n", bg_base);
int k, off = 0;
for (k = 0; k < 1024; k++) {
int tile = dmg_read(dmg, bg_base + k);
int eff_addr;
if (use_unsigned) {
eff_addr = tilebase + 16 * tile;
} else {
eff_addr = tilebase + 16 * (signed char) tile;
}
int b, i;
for (b = 0; b < 16; b += 2) {
int data1 = dmg_read(dmg, eff_addr + b);
int data2 = dmg_read(dmg, eff_addr + b + 1);
for (i = 0; i < 8; i++) {
// monochrome for now
dmg->lcd->buf[off] |= (data1 & (1 << i)) ? 1 : 0;
dmg->lcd->buf[off] |= (data2 & (1 << i)) ? 1 : 0;
off++;
}
}
}
// now copy 256x256 buf to 160x144 based on window registers
lcd_copy(dmg->lcd);
lcd_draw(dmg->lcd);

2
src/lcd.c
View File

@ -59,7 +59,7 @@ void lcd_put_pixel(struct lcd *lcd, u8 x, u8 y, u8 value)
void lcd_copy(struct lcd *lcd)
{
// use all the registers to compute the pixel data
}
int lcd_step(struct lcd *lcd)