added attribute table viewer

src/debugger/NametableViewer.cpp

@@ -5,17 +5,25 @@
 #include "../Bus.hpp"
 
 NametableViewer::NametableViewer(Debugger* debugger, Bus* bus) :
-	DebugWindow("Nametable Viewer", debugger), bus(bus), texture(0)
+	DebugWindow("Nametable Viewer", debugger), bus(bus), texture(0), attributeTexture(0)
 {
 	glCreateTextures(GL_TEXTURE_2D, 1, &texture);
 	glTextureStorage2D(texture, 1, GL_R8, 32, 32);
 
 	glTextureParameteri(texture, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 	glTextureParameteri(texture, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+
+	glCreateTextures(GL_TEXTURE_2D, 1, &attributeTexture);
+	glTextureStorage2D(attributeTexture, 1, GL_R8, 16, 16);
+
+	glTextureParameteri(attributeTexture, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTextureParameteri(attributeTexture, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 }
 
 NametableViewer::~NametableViewer()
 {
+	glDeleteTextures(1, &attributeTexture);
 	glDeleteTextures(1, &texture);
 }
 
@@ -32,7 +40,8 @@ void NametableViewer::OnRender()
 	{
 		if (ImGui::BeginMenu("Views"))
 		{
-			ImGui::MenuItem("Rendered View", NULL, &renderNametable);
+			ImGui::MenuItem("Rendered Nametable", NULL, &renderNametable);
+			ImGui::MenuItem("Rendered Attribute Table", NULL, &renderAttributeTable);
 
 			ImGui::EndMenu();
 		}
@@ -48,11 +57,17 @@ void NametableViewer::OnRender()
 		if (ImGui::BeginTabItem(baseAddress))
 		{
 			DisplayNametable(index);
+
 			if (renderNametable)
 			{
 				glTextureSubImage2D(texture, 0, 0, 0, 32, 32, GL_RED, GL_UNSIGNED_BYTE, &bus->VRAM[0x400 * index]);
 			}
 
+			if (renderAttributeTable)
+			{
+				RenderAttributeTable(index);
+			}
+
 			ImGui::EndTabItem();
 		}
 
@@ -76,6 +91,23 @@ void NametableViewer::OnRender()
 		ImGui::End();
 	}
 
+	if (renderAttributeTable)
+	{
+		ImGui::SetNextWindowSize(ImVec2(400, 400), ImGuiCond_FirstUseEver);
+		if (!ImGui::Begin("Rendered Attribute Table", &renderNametable))
+		{
+			ImGui::End();
+			return;
+		}
+
+		float smallerSize = std::min(ImGui::GetWindowWidth(), ImGui::GetWindowHeight()) - 20.0f;
+		if (smallerSize < 40.0f)
+			smallerSize = 40.0f;
+
+		ImGui::Image((ImTextureID)attributeTexture, ImVec2{ smallerSize, smallerSize - 20.0f });
+		ImGui::End();
+	}
+
 	ImGui::End();
 }
 
@@ -121,3 +153,27 @@ void NametableViewer::DisplayNametable(uint8_t index)
 		ImGui::EndTable();
 	}
 }
+
+void NametableViewer::RenderAttributeTable(uint8_t index)
+{
+	Word baseAddr = 0x400 * index + 0x3C0;
+	std::vector<uint8_t> pixels(16 * 16);
+
+	for (int i = 0; i < 64; i++)
+	{
+		Byte attribute = bus->VRAM[baseAddr + i];
+
+		for (int y = 0; y < 2; y++)
+		{
+			for (int x = 0; x < 2; x++)
+			{
+				Byte color = (attribute & 0x3);
+				pixels[(32 * (i / 8) + 16 * y) + 2 * (i % 8) + x] = color * 80;
+
+				attribute >>= 2;
+			}
+		}
+	}
+
+	glTextureSubImage2D(attributeTexture, 0, 0, 0, 16, 16, GL_RED, GL_UNSIGNED_BYTE, (const void*)pixels.data());
+}

src/debugger/NametableViewer.hpp

@@ -15,9 +15,12 @@ public:
 	
 private:
 	void DisplayNametable(uint8_t index);
+	void RenderAttributeTable(uint8_t index);
 
 private:
 	Bus* bus;
 	uint32_t texture;
+	uint32_t attributeTexture;
 	bool renderNametable = false;
+	bool renderAttributeTable = false;
 };