Mercurial > repos > blastem
view oscilloscope.c @ 2316:523ab225815b
Allow dpad to increment/decrement property fields
author | Michael Pavone <pavone@retrodev.com> |
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date | Sun, 02 Apr 2023 23:21:04 -0700 |
parents | d30ea441b92e |
children |
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#include "oscilloscope.h" #include "render.h" #include "blastem.h" #include <stdlib.h> #include <string.h> #define INVALID_TRIGGER 0xFFFFFFFF #define WIDTH 1280 #define HEIGHT 720 static void scope_window_close(uint8_t which) { if (current_system && current_system->toggle_debug_view) { current_system->toggle_debug_view(current_system, DEBUG_OSCILLOSCOPE); } } oscilloscope *create_oscilloscope() { oscilloscope *scope = calloc(1, sizeof(oscilloscope)); scope->channel_storage = 4; scope->channels = calloc(scope->channel_storage, sizeof(scope_channel)); scope->window = render_create_window("Oscilloscope", WIDTH, HEIGHT, scope_window_close); return scope; } uint8_t scope_add_channel(oscilloscope *scope, const char *name, uint32_t sample_rate) { if (scope->num_channels == scope->channel_storage) { scope->channel_storage *= 2; scope->channels = realloc(scope->channels, scope->channel_storage * sizeof(scope_channel)); } uint8_t channel = scope->num_channels++; scope_channel *chan = scope->channels + channel; chan->name = name; chan->period = sample_rate / 30; chan->next_sample = 0; chan->samples = calloc(chan->period, sizeof(int16_t)); chan->last_trigger = INVALID_TRIGGER; chan->cur_trigger = INVALID_TRIGGER; return channel; } void scope_add_sample(oscilloscope *scope, uint8_t channel, int16_t value, uint8_t trigger) { if (channel >= scope->num_channels) { return; } scope_channel *chan = scope->channels + channel; if (trigger) { chan->cur_trigger = chan->next_sample; } chan->samples[chan->next_sample++] = value; if (chan->next_sample == chan->period) { chan->next_sample = 0; } } void scope_render(oscilloscope *scope) { int pitch; uint32_t *fb = render_get_framebuffer(scope->window, &pitch); memset(fb, 0, HEIGHT * pitch); pitch /= sizeof(uint32_t); int offset = 0; int column_width = WIDTH/3; int width = column_width * 3; int row_height = HEIGHT / ((scope->num_channels + 2) / 3); float value_scale = (float)row_height / 20000.0f; uint32_t *cur_line = fb; for (uint8_t i = 0; i < scope->num_channels; i++) { float samples_per_pixel = (float)scope->channels[i].period / (float)(2*column_width); uint32_t start = scope->channels[i].last_trigger; if (start == INVALID_TRIGGER) { if (scope->channels[i].next_sample >= scope->channels[i].period / 2) { start = scope->channels[i].next_sample - scope->channels[i].period / 2; } else { start = scope->channels[i].period - (scope->channels[i].period /2 - scope->channels[i].next_sample); } } scope->channels[i].last_trigger = scope->channels[i].cur_trigger; scope->channels[i].cur_trigger = INVALID_TRIGGER; float cur_sample = start; int last_y = -1; for (int x = offset; x < offset + column_width; x++) { //TODO: bresenham //TODO: at least linear filtering int16_t sample = scope->channels[i].samples[(int)(cur_sample + 0.5f)]; int y = (float)sample * value_scale + 0.5f; if (y > row_height / 2 - 1) { y = row_height / 2 - 1; } else if (y < -(row_height / 2)) { y = -(row_height / 2); } y += row_height / 2; if (last_y >= 0) { int delta = last_y > y ? -1 : 1; while (last_y != y) { cur_line[last_y * pitch + x ] = 0xFFFFFFFF; last_y += delta; } } else { last_y = y; } cur_line[y * pitch + x ] = 0xFFFFFFFF; cur_sample += samples_per_pixel; if (cur_sample + 0.5f >= scope->channels[i].period) { cur_sample -= scope->channels[i].period; } } offset += column_width; if (offset >= width) { offset = 0; cur_line += pitch * row_height; } } render_framebuffer_updated(scope->window, WIDTH); } void scope_close(oscilloscope *scope) { render_destroy_window(scope->window); for (uint8_t i = 0; i < scope->num_channels; i++) { free(scope->channels[i].samples); } free(scope->channels); free(scope); }