basic ppu background rendering

src/debugger/Debugger.cpp

@@ -11,6 +11,7 @@
 #include "MemoryViewer.hpp"
 #include "NametableViewer.hpp"
 #include "ControllerPortViewer.hpp"
+#include "Palettes.hpp"
 
 Debugger::Debugger(Bus* bus) :
 	bus(bus)
@@ -26,6 +27,7 @@ Debugger::Debugger(Bus* bus) :
 	windows.push_back(new MemoryViewer(this, bus));
 	windows.push_back(new NametableViewer(this, bus));
 	windows.push_back(new ControllerPortViewer(this, &bus->controllerPort));
+	windows.push_back(new Palettes(this, bus));
 }
 
 Debugger::~Debugger()

src/debugger/PPUWatcher.cpp

@@ -86,7 +86,15 @@ void PPUWatcher::OnRender()
 		ImGui::Text("Pattern Tile Lo: %02X", ppu->patternTableLo);
 		ImGui::Text("Pattern Tile Hi: %02X", ppu->patternTableHi);
 	}
-	
+
+	if (ImGui::CollapsingHeader("Shift Registers"))
+	{
+		ImGui::Text("Pattern Tile Lo: %04X", ppu->loTile.Raw);
+		ImGui::Text("Pattern Tile Hi: %02X", ppu->hiTile.Raw);
+		ImGui::Text("Attribute Lo   : %02X", ppu->loAttribute.Raw);
+		ImGui::Text("Attribute Hi   : %02X", ppu->hiAttribute.Raw);
+	}
+
 	if (ImGui::CollapsingHeader("Registers"))
 	{
 		if (ImGui::TreeNode("PPUCTRL"))

src/debugger/Palettes.cpp

@@ -0,0 +1,78 @@
+#include "Palettes.hpp"
+
+#include <glad/glad.h>
+
+#include "../Bus.hpp"
+#include "../PPU.hpp"
+#include <imgui/imgui.h>
+
+
+Palettes::Palettes(Debugger* debugger, Bus* bus) :
+	DebugWindow("Palettes", debugger), bus(bus)
+{
+	glCreateTextures(GL_TEXTURE_2D, 4, backgroundPalettes.data());
+	glCreateTextures(GL_TEXTURE_2D, 4, spritePalettes.data());
+
+	for (GLuint texture : backgroundPalettes)
+	{
+		glTextureStorage2D(texture, 1, GL_RGB8, 4, 1);
+		glTextureParameteri(texture, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTextureParameteri(texture, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	}
+
+	for (GLuint texture : spritePalettes)
+	{
+		glTextureStorage2D(texture, 1, GL_RGB8, 4, 1);
+		glTextureParameteri(texture, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		glTextureParameteri(texture, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	}
+}
+
+Palettes::~Palettes()
+{
+	glDeleteTextures(4, spritePalettes.data());
+	glDeleteTextures(4, backgroundPalettes.data());
+}
+
+void Palettes::OnRender()
+{
+	ImGui::SetNextWindowSize(ImVec2(400, 400), ImGuiCond_FirstUseEver);
+	if (!ImGui::Begin(title.c_str(), &isOpen))
+	{
+		ImGui::End();
+		return;
+	}
+
+	Color palette[4];
+	palette[0] = PPU::colorTable[bus->palettes[0]];
+	ImVec2 size = ImGui::GetWindowSize();
+	size.x /= 2;
+	size.y = size.x / 4;
+	if (ImGui::CollapsingHeader("Background"))
+	{
+		for (int i = 0; i < 4; i++)
+		{
+			palette[1] = PPU::colorTable[bus->palettes[i * 4 + 1]];
+			palette[2] = PPU::colorTable[bus->palettes[i * 4 + 2]];
+			palette[3] = PPU::colorTable[bus->palettes[i * 4 + 3]];
+
+			glTextureSubImage2D(backgroundPalettes[i], 0, 0, 0, 4, 1, GL_RGB, GL_UNSIGNED_BYTE, (const void*)palette);
+			ImGui::Image((ImTextureID)backgroundPalettes[i], size);
+		}
+	}
+
+	if (ImGui::CollapsingHeader("Sprites"))
+	{
+		for (int i = 0; i < 4; i++)
+		{
+			palette[1] = PPU::colorTable[bus->palettes[0x10 + i * 4 + 1]];
+			palette[2] = PPU::colorTable[bus->palettes[0x10 + i * 4 + 2]];
+			palette[3] = PPU::colorTable[bus->palettes[0x10 + i * 4 + 3]];
+
+			glTextureSubImage2D(spritePalettes[i], 0, 0, 0, 4, 1, GL_RGB, GL_UNSIGNED_BYTE, (const void*)palette);
+			ImGui::Image((ImTextureID)spritePalettes[i], size);
+		}
+	}
+
+	ImGui::End();
+}

src/debugger/Palettes.hpp

@@ -0,0 +1,22 @@
+#pragma once
+
+#include <array>
+#include "DebugWindow.hpp"
+
+class Bus;
+
+class Palettes :
+	public DebugWindow
+{
+public:
+	Palettes(Debugger* debugger, Bus* bus);
+	~Palettes();
+
+	virtual void OnRender() override;
+
+private:
+	Bus* bus;
+
+	std::array<uint32_t, 4> backgroundPalettes;
+	std::array<uint32_t, 4> spritePalettes;
+};