Refinements to camera support according to AntonioND's docs
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@ -2,7 +2,7 @@
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uint8_t GB_camera_read_image(GB_gameboy_t *gb, uint16_t addr)
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uint8_t GB_camera_read_image(GB_gameboy_t *gb, uint16_t addr)
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{
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{
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if (gb->camera_registers[GB_CAMERA_FLAGS] & 1) {
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if (gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS] & 1) {
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/* Forbid reading the image while the camera is busy. */
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/* Forbid reading the image while the camera is busy. */
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return 0xFF;
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return 0xFF;
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}
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}
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@ -18,16 +18,24 @@ uint8_t GB_camera_read_image(GB_gameboy_t *gb, uint16_t addr)
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long color = gb->camera_get_pixel_callback? gb->camera_get_pixel_callback(gb, x,y) : (rand() & 0xFF);
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long color = gb->camera_get_pixel_callback? gb->camera_get_pixel_callback(gb, x,y) : (rand() & 0xFF);
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/* Color is multiplied by the multiplier register. */
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static const double gain_values[] = {0.8809390, 0.9149149, 0.9457498, 0.9739758,
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/* It is unknown what register 1 does, but changing bits 2-3 from 0x4 to 0x8 seems equivalent to adding 0x2000
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1.0000000, 1.0241412, 1.0466537, 1.0677433,
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to the multiplier. Is it related to actual exposure time? */
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1.0875793, 1.1240310, 1.1568911, 1.1868043,
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unsigned long multiplier_bias = (gb->camera_registers[GB_CAMERA_UNKNOWN_FLAGS] & 0xF) * 0x800;
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1.2142561, 1.2396208, 1.2743837, 1.3157323,
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color = color * ((gb->camera_registers[GB_CAMERA_MULTIPLIER_HIGH] << 8) + gb->camera_registers[GB_CAMERA_MULTIPLIER_LOW] + multiplier_bias) / 0x3000;
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1.3525190, 1.3856512, 1.4157897, 1.4434309,
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1.4689574, 1.4926697, 1.5148087, 1.5355703,
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1.5551159, 1.5735801, 1.5910762, 1.6077008,
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1.6235366, 1.6386550, 1.6531183, 1.6669808};
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/* Multiply color by gain value */
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color *= gain_values[gb->camera_registers[GB_CAMERA_GAIN_AND_EDGE_ENCHANCEMENT_FLAGS] & 0x1F];
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/* Color is multiplied by the exposure register to simulate exposure. */
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color = color * ((gb->camera_registers[GB_CAMERA_EXPOSURE_HIGH] << 8) + gb->camera_registers[GB_CAMERA_EXPOSURE_LOW]) / 0x1000;
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/* The camera's registers are used as a threshold pattern, which defines the dithering */
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/* The camera's registers are used as a threshold pattern, which defines the dithering */
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uint8_t pattern_base = ((x & 3) + (y & 3) * 4) * 3 + GB_CAMERA_DITHERING_PATTERN_START;
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uint8_t pattern_base = ((x & 3) + (y & 3) * 4) * 3 + GB_CAMERA_DITHERING_PATTERN_START;
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/* Todo: I have absolutely no reason to assume that this does not go backwards! */
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if (color < gb->camera_registers[pattern_base]) {
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if (color < gb->camera_registers[pattern_base]) {
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color = 3;
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color = 3;
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}
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}
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@ -60,16 +68,17 @@ void GB_set_camera_update_request_callback(GB_gameboy_t *gb, GB_camera_update_re
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void GB_camera_updated(GB_gameboy_t *gb)
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void GB_camera_updated(GB_gameboy_t *gb)
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{
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{
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gb->camera_registers[GB_CAMERA_FLAGS] &= ~1;
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gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS] &= ~1;
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}
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}
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void GB_camera_write_register(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
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void GB_camera_write_register(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
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{
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{
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addr &= 0x7F;
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addr &= 0x7F;
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if (addr == GB_CAMERA_FLAGS) {
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if (addr == GB_CAMERA_SHOOT_AND_1D_FLAGS) {
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if ((value & 1) && !(gb->camera_registers[GB_CAMERA_FLAGS] & 1) && gb->camera_update_request_callback) {
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value &= 0x7;
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if ((value & 1) && !(gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS] & 1) && gb->camera_update_request_callback) {
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/* If no callback is set, ignore the write as if the camera is instantly done */
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/* If no callback is set, ignore the write as if the camera is instantly done */
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gb->camera_registers[GB_CAMERA_FLAGS] |= 1;
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gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS] |= 1;
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gb->camera_update_request_callback(gb);
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gb->camera_update_request_callback(gb);
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}
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}
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}
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}
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@ -85,7 +94,7 @@ void GB_camera_write_register(GB_gameboy_t *gb, uint16_t addr, uint8_t value)
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uint8_t GB_camera_read_register(GB_gameboy_t *gb, uint16_t addr)
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uint8_t GB_camera_read_register(GB_gameboy_t *gb, uint16_t addr)
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{
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{
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if ((addr & 0x7F) == 0) {
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if ((addr & 0x7F) == 0) {
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return gb->camera_registers[GB_CAMERA_FLAGS];
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return gb->camera_registers[GB_CAMERA_SHOOT_AND_1D_FLAGS];
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}
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}
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return 0;
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return 0;
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}
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}
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@ -3,10 +3,10 @@
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#include "gb.h"
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#include "gb.h"
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enum {
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enum {
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GB_CAMERA_FLAGS = 0,
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GB_CAMERA_SHOOT_AND_1D_FLAGS = 0,
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GB_CAMERA_UNKNOWN_FLAGS = 1,
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GB_CAMERA_GAIN_AND_EDGE_ENCHANCEMENT_FLAGS = 1,
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GB_CAMERA_MULTIPLIER_HIGH = 2,
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GB_CAMERA_EXPOSURE_HIGH = 2,
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GB_CAMERA_MULTIPLIER_LOW = 3,
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GB_CAMERA_EXPOSURE_LOW = 3,
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GB_CAMERA_DITHERING_PATTERN_START = 6,
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GB_CAMERA_DITHERING_PATTERN_START = 6,
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GB_CAMERA_DITHERING_PATTERN_END = 0x35,
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GB_CAMERA_DITHERING_PATTERN_END = 0x35,
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};
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};
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