mirror of https://github.com/mlaux/gb6.git
253 lines
8.8 KiB
C++
253 lines
8.8 KiB
C++
// Dear ImGui: standalone example application for SDL2 + OpenGL
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// (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan/Metal graphics context creation, etc.)
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// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
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// Read online: https://github.com/ocornut/imgui/tree/master/docs
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#include "imgui/imgui.h"
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#include "imgui/imgui_impl_sdl.h"
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#include "imgui/imgui_impl_opengl3.h"
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#include <stdio.h>
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#include <SDL.h>
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#if defined(IMGUI_IMPL_OPENGL_ES2)
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#include <SDL_opengles2.h>
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#else
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#include <SDL_opengl.h>
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#endif
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#include <string>
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extern "C" {
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#include "dmg.h"
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#include "cpu.h"
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#include "rom.h"
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#include "lcd.h"
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}
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static const char *A_FORMAT = "A: 0x%02x";
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static const char *B_FORMAT = "B: 0x%02x";
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static const char *C_FORMAT = "C: 0x%02x";
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static const char *D_FORMAT = "D: 0x%02x";
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static const char *E_FORMAT = "E: 0x%02x";
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static const char *H_FORMAT = "H: 0x%02x";
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static const char *L_FORMAT = "L: 0x%02x";
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static const char *SP_FORMAT = "SP: 0x%02x";
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static const char *PC_FORMAT = "PC: 0x%02x";
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GLuint make_output_texture() {
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GLuint image_texture;
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glGenTextures(1, &image_texture);
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glBindTexture(GL_TEXTURE_2D, image_texture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); // This is required on WebGL for non power-of-two textures
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); // Same
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return image_texture;
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}
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unsigned char output_image[160 * 144 * 4];
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void convert_output(struct lcd *lcd) {
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int x, y;
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int out_index = 0;
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for (y = 0; y < 144; y++) {
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for (x = 0; x < 160; x++) {
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int val = lcd->pixels[y * 160 + x];
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int fill = val ? 255 : 0;
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output_image[out_index++] = val;
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output_image[out_index++] = val;
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output_image[out_index++] = val;
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output_image[out_index++] = 255;
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}
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}
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}
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// Main code
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int main(int argc, char *argv[])
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{
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struct cpu cpu;
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struct rom rom;
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struct dmg dmg;
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struct lcd lcd;
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int executed;
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if (argc < 2) {
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printf("no rom specified\n");
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return 1;
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}
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if (!rom_load(&rom, argv[1])) {
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printf("error loading rom\n");
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return 1;
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}
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lcd_new(&lcd);
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// this might be too much abstraction but it'll let me
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// test the cpu, rom, and dmg independently and use the cpu
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// for other non-GB stuff
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dmg_new(&dmg, &cpu, &rom, &lcd);
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cpu_bind_mem_model(&cpu, &dmg, dmg_read, dmg_write);
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cpu.pc = 0x100;
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// Setup SDL
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// (Some versions of SDL before <2.0.10 appears to have performance/stalling issues on a minority of Windows systems,
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// depending on whether SDL_INIT_GAMECONTROLLER is enabled or disabled.. updating to latest version of SDL is recommended!)
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if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0)
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{
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printf("Error: %s\n", SDL_GetError());
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return -1;
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}
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// Decide GL+GLSL versions
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#if defined(IMGUI_IMPL_OPENGL_ES2)
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// GL ES 2.0 + GLSL 100
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const char* glsl_version = "#version 100";
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
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#elif defined(__APPLE__)
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// GL 3.2 Core + GLSL 150
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const char* glsl_version = "#version 150";
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG); // Always required on Mac
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
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#else
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// GL 3.0 + GLSL 130
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const char* glsl_version = "#version 130";
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
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#endif
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// Create window with graphics context
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SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
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SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
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SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
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SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
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SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, window_flags);
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SDL_GLContext gl_context = SDL_GL_CreateContext(window);
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SDL_GL_MakeCurrent(window, gl_context);
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SDL_GL_SetSwapInterval(1); // Enable vsync
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// Setup Dear ImGui context
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IMGUI_CHECKVERSION();
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ImGui::CreateContext();
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ImGuiIO& io = ImGui::GetIO(); (void)io;
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io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
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//io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
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// Setup Dear ImGui style
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ImGui::StyleColorsDark();
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//ImGui::StyleColorsLight();
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// Setup Platform/Renderer backends
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ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
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ImGui_ImplOpenGL3_Init(glsl_version);
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// setup output
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GLuint texture = make_output_texture();
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// Our state
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ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
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bool z_flag = false;
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bool n_flag = false;
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bool h_flag = false;
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bool c_flag = false;
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// Main loop
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bool done = false;
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while (!done)
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{
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// Poll and handle events (inputs, window resize, etc.)
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// You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs.
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// - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application, or clear/overwrite your copy of the mouse data.
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// - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application, or clear/overwrite your copy of the keyboard data.
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// Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags.
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SDL_Event event;
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while (SDL_PollEvent(&event))
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{
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ImGui_ImplSDL2_ProcessEvent(&event);
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if (event.type == SDL_QUIT)
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done = true;
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if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
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done = true;
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}
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// Start the Dear ImGui frame
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ImGui_ImplOpenGL3_NewFrame();
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ImGui_ImplSDL2_NewFrame();
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ImGui::NewFrame();
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dmg_step(&dmg);
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// 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window.
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{
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ImGui::Begin("State"); // Create a window called "Hello, world!" and append into it.
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ImGui::Text(A_FORMAT);
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ImGui::Text(B_FORMAT);
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ImGui::SameLine();
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ImGui::Text(C_FORMAT);
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ImGui::Text(D_FORMAT);
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ImGui::SameLine();
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ImGui::Text(E_FORMAT);
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ImGui::Text(H_FORMAT);
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ImGui::SameLine();
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ImGui::Text(L_FORMAT);
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ImGui::Text(SP_FORMAT);
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ImGui::SameLine();
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ImGui::Text(PC_FORMAT);
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ImGui::Checkbox("Z", &z_flag);
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ImGui::SameLine();
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ImGui::Checkbox("N", &n_flag);
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ImGui::SameLine();
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ImGui::Checkbox("H", &h_flag);
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ImGui::SameLine();
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ImGui::Checkbox("C", &c_flag);
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ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
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ImGui::End();
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}
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{
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ImGui::Begin("Output");
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convert_output(dmg.lcd);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 160, 144, 0, GL_RGBA, GL_UNSIGNED_BYTE, output_image);
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ImGui::Image((void*)(intptr_t) texture, ImVec2(160, 144));
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ImGui::End();
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}
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// Rendering
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ImGui::Render();
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glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
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glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
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glClear(GL_COLOR_BUFFER_BIT);
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ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
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SDL_GL_SwapWindow(window);
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}
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rom_free(&rom);
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// Cleanup
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ImGui_ImplOpenGL3_Shutdown();
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ImGui_ImplSDL2_Shutdown();
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ImGui::DestroyContext();
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SDL_GL_DeleteContext(gl_context);
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SDL_DestroyWindow(window);
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SDL_Quit();
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return 0;
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}
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