gen opengl texture, convert lcd to gl rgba format, draw in window

cli/imgui_example.cpp

@@ -13,10 +13,85 @@
 #else
 #include <SDL_opengl.h>
 #endif
+#include <string>
+
+extern "C" {
+#include "dmg.h"
+#include "cpu.h"
+#include "rom.h"
+#include "lcd.h"
+}
+
+static const char *A_FORMAT = "A: 0x%02x";
+static const char *B_FORMAT = "B: 0x%02x";
+static const char *C_FORMAT = "C: 0x%02x";
+static const char *D_FORMAT = "D: 0x%02x";
+static const char *E_FORMAT = "E: 0x%02x";
+static const char *H_FORMAT = "H: 0x%02x";
+static const char *L_FORMAT = "L: 0x%02x";
+static const char *SP_FORMAT = "SP: 0x%02x";
+static const char *PC_FORMAT = "PC: 0x%02x";
+
+GLuint make_output_texture() {
+    GLuint image_texture;
+    glGenTextures(1, &image_texture);
+    glBindTexture(GL_TEXTURE_2D, image_texture);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); // This is required on WebGL for non power-of-two textures
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); // Same
+
+    return image_texture;
+}
+
+unsigned char output_image[160 * 144 * 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];
+            int fill = val ? 255 : 0;
+            output_image[out_index++] = val;
+            output_image[out_index++] = val;
+            output_image[out_index++] = val;
+            output_image[out_index++] = 255;
+        }
+    }
+}
 
 // Main code
-int main(int, char**)
+int main(int argc, char *argv[])
 {
+    struct cpu cpu;
+    struct rom rom;
+    struct dmg dmg;
+    struct lcd lcd;
+
+    int executed;
+
+    if (argc < 2) {
+        printf("no rom specified\n");
+        return 1;
+    }
+
+    if (!rom_load(&rom, argv[1])) {
+        printf("error loading rom\n");
+        return 1;
+    }
+
+    lcd_new(&lcd);
+
+    // this might be too much abstraction but it'll let me
+    // test the cpu, rom, and dmg independently and use the cpu
+    // for other non-GB stuff
+    dmg_new(&dmg, &cpu, &rom, &lcd);
+    cpu_bind_mem_model(&cpu, &dmg, dmg_read, dmg_write);
+
+    cpu.pc = 0x100;
+
     // Setup SDL
     // (Some versions of SDL before <2.0.10 appears to have performance/stalling issues on a minority of Windows systems,
     // depending on whether SDL_INIT_GAMECONTROLLER is enabled or disabled.. updating to latest version of SDL is recommended!)
@@ -55,7 +130,7 @@ int main(int, char**)
     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
     SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
     SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
-    SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
+    SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 480, window_flags);
     SDL_GLContext gl_context = SDL_GL_CreateContext(window);
     SDL_GL_MakeCurrent(window, gl_context);
     SDL_GL_SetSwapInterval(1); // Enable vsync
@@ -64,7 +139,7 @@ int main(int, char**)
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
     ImGuiIO& io = ImGui::GetIO(); (void)io;
-    //io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
+    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
     //io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
 
     // Setup Dear ImGui style
@@ -75,26 +150,17 @@ int main(int, char**)
     ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
     ImGui_ImplOpenGL3_Init(glsl_version);
 
-    // Load Fonts
-    // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
-    // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
-    // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
-    // - Read 'docs/FONTS.md' for more instructions and details.
-    // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
-    //io.Fonts->AddFontDefault();
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
-    //io.Fonts->AddFontFromFileTTF("../../misc/fonts/ProggyTiny.ttf", 10.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    // setup output
+    GLuint texture = make_output_texture();
 
     // Our state
-    bool show_demo_window = true;
-    bool show_another_window = false;
     ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
 
+    bool z_flag = false;
+    bool n_flag = false;
+    bool h_flag = false;
+    bool c_flag = false;
+
     // Main loop
     bool done = false;
     while (!done)
@@ -119,40 +185,46 @@ int main(int, char**)
         ImGui_ImplSDL2_NewFrame();
         ImGui::NewFrame();
 
-        // 1. Show the big demo window (Most of the sample code is in ImGui::ShowDemoWindow()! You can browse its code to learn more about Dear ImGui!).
-        if (show_demo_window)
-            ImGui::ShowDemoWindow(&show_demo_window);
+        dmg_step(&dmg);
 
         // 2. Show a simple window that we create ourselves. We use a Begin/End pair to created a named window.
         {
-            static float f = 0.0f;
-            static int counter = 0;
+            ImGui::Begin("State");                          // Create a window called "Hello, world!" and append into it.
 
-            ImGui::Begin("Hello, world!");                          // Create a window called "Hello, world!" and append into it.
-
-            ImGui::Text("This is some useful text.");               // Display some text (you can use a format strings too)
-            ImGui::Checkbox("Demo Window", &show_demo_window);      // Edit bools storing our window open/close state
-            ImGui::Checkbox("Another Window", &show_another_window);
-
-            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);            // Edit 1 float using a slider from 0.0f to 1.0f
-            ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
-
-            if (ImGui::Button("Button"))                            // Buttons return true when clicked (most widgets return true when edited/activated)
-                counter++;
+            ImGui::Text(A_FORMAT);
+            ImGui::Text(B_FORMAT);
             ImGui::SameLine();
-            ImGui::Text("counter = %d", counter);
+            ImGui::Text(C_FORMAT);
+            ImGui::Text(D_FORMAT);
+            ImGui::SameLine();
+            ImGui::Text(E_FORMAT);
+            ImGui::Text(H_FORMAT);
+            ImGui::SameLine();
+            ImGui::Text(L_FORMAT);
+            ImGui::Text(SP_FORMAT);
+            ImGui::SameLine();
+            ImGui::Text(PC_FORMAT);
+
+            ImGui::Checkbox("Z", &z_flag);
+            ImGui::SameLine();
+            ImGui::Checkbox("N", &n_flag);
+            ImGui::SameLine();
+            ImGui::Checkbox("H", &h_flag);
+            ImGui::SameLine();
+            ImGui::Checkbox("C", &c_flag);
 
             ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
             ImGui::End();
         }
 
-        // 3. Show another simple window.
-        if (show_another_window)
         {
-            ImGui::Begin("Another Window", &show_another_window);   // Pass a pointer to our bool variable (the window will have a closing button that will clear the bool when clicked)
-            ImGui::Text("Hello from another window!");
-            if (ImGui::Button("Close Me"))
-                show_another_window = false;
+            ImGui::Begin("Output");
+
+            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));
+
             ImGui::End();
         }
 
@@ -165,6 +237,8 @@ int main(int, char**)
         SDL_GL_SwapWindow(window);
     }
 
+    rom_free(&rom);
+
     // Cleanup
     ImGui_ImplOpenGL3_Shutdown();
     ImGui_ImplSDL2_Shutdown();