diff --git a/src/nostalgia/modules/gfx/include/nostalgia/gfx/gfx.hpp b/src/nostalgia/modules/gfx/include/nostalgia/gfx/gfx.hpp
index 2850bb82..1271ac6e 100644
--- a/src/nostalgia/modules/gfx/include/nostalgia/gfx/gfx.hpp
+++ b/src/nostalgia/modules/gfx/include/nostalgia/gfx/gfx.hpp
@@ -231,10 +231,10 @@ void hideSprite(Context &ctx, unsigned) noexcept;
 
 void showSprite(Context &ctx, unsigned) noexcept;
 
-void setSprite(Context &c, uint_t idx, Sprite const&s) noexcept;
+void setSprite(Context &ctx, uint_t idx, Sprite const&sprite) noexcept;
 
 [[nodiscard]]
-uint_t spriteCount(Context &ctx) noexcept;
+uint_t spriteCount(Context const &ctx) noexcept;
 
 ox::Error initConsole(Context &ctx) noexcept;
 
diff --git a/src/nostalgia/modules/gfx/src/gba/gfx.cpp b/src/nostalgia/modules/gfx/src/gba/gfx.cpp
index 65b9ca73..2bccaa0f 100644
--- a/src/nostalgia/modules/gfx/src/gba/gfx.cpp
+++ b/src/nostalgia/modules/gfx/src/gba/gfx.cpp
@@ -293,7 +293,7 @@ void setSprite(Context&, uint_t idx, Sprite const&s) noexcept {
 	});
 }
 
-uint_t spriteCount(Context&) noexcept {
+uint_t spriteCount(Context const &) noexcept {
 	return SpriteCount;
 }
 
diff --git a/src/nostalgia/modules/gfx/src/opengl/gfx.cpp b/src/nostalgia/modules/gfx/src/opengl/gfx.cpp
index e6e26d4b..e88e7e0c 100644
--- a/src/nostalgia/modules/gfx/src/opengl/gfx.cpp
+++ b/src/nostalgia/modules/gfx/src/opengl/gfx.cpp
@@ -183,7 +183,7 @@ static void setTileBufferObject(
 	ox::spancpy<GLuint>(ebo, elms);
 }
 
-static void initSpriteBufferObjects(Context &ctx, glutils::BufferSet &bs) noexcept {
+static void initSpriteBufferObjects(Context const &ctx, glutils::BufferSet &bs) noexcept {
 	for (auto i = 0u; i < ctx.spriteCount; ++i) {
 		auto const vbo = ox::Span{bs.vertices}
 			+ i * static_cast<std::size_t>(SpriteVertexVboLength);
@@ -256,7 +256,7 @@ static void initSpritesBufferset(Context &ctx) noexcept {
 }
 
 static void initBackgroundBufferset(
-		GLuint shader,
+		GLuint const shader,
 		glutils::BufferSet &bs) noexcept {
 	// vao
 	bs.vao = glutils::generateVertexArrayObject();
@@ -375,10 +375,10 @@ static void drawSprites(Context &ctx, ox::Size const&renderSz) noexcept {
 
 static void loadPalette(
 		ox::Array<GLfloat, 1024> &palette,
-		size_t palOffset,
-		GLuint shaderPgrm,
+		size_t const palOffset,
+		GLuint const shaderPgrm,
 		CompactPalette const&pal,
-		size_t page = 0) noexcept {
+		size_t const page = 0) noexcept {
 	static constexpr std::size_t ColorCnt = 256;
 	for (auto i = palOffset; auto const c : pal.pages[page]) {
 		palette[i++] = redf(c);
@@ -528,9 +528,9 @@ static ox::Result<TileSheetData> normalizeTileSheet(
 
 ox::Error loadBgPalette(
 		Context &ctx,
-		size_t palBank,
+		size_t const palBank,
 		CompactPalette const&palette,
-		size_t page) noexcept {
+		size_t const page) noexcept {
 	renderer::loadPalette(ctx.bgPalette, palBank * 16 * 4, ctx.bgShader, palette, page);
 	return {};
 }
@@ -538,14 +538,14 @@ ox::Error loadBgPalette(
 ox::Error loadSpritePalette(
 		Context &ctx,
 		CompactPalette const&palette,
-		size_t page) noexcept {
+		size_t const page) noexcept {
 	ox::Array<GLfloat, 1024> pal;
 	renderer::loadPalette(pal, 0, ctx.spriteShader, palette, page);
 	return {};
 }
 
 static ox::Result<TileSheetData> buildSetTsd(
-		Context &ctx,
+		Context const &ctx,
 		TileSheetSet const&set) noexcept {
 	auto &kctx = keelCtx(ctx.turbineCtx);
 	TileSheetData setTsd;
@@ -624,7 +624,7 @@ ox::Error loadBgTileSheet(
 
 ox::Error loadBgTileSheet(
 		Context &ctx,
-		uint_t cbb,
+		uint_t const cbb,
 		CompactTileSheet const&ts,
 		ox::Optional<unsigned> const&paletteBank) noexcept {
 	auto const bytesPerTile = static_cast<uint64_t>(PixelsPerTile / (1 + (ts.bpp == 4)));
@@ -638,7 +638,7 @@ ox::Error loadBgTileSheet(
 
 ox::Error loadBgTileSheet(
 		Context &ctx,
-		unsigned cbb,
+		unsigned const cbb,
 		TileSheetSet const&set) noexcept {
 	OX_REQUIRE(setTsd, buildSetTsd(ctx, set));
 	ctx.cbbs[cbb].tex = renderer::createTexture(setTsd.width, setTsd.height, setTsd.pixels.data());
@@ -648,7 +648,7 @@ ox::Error loadBgTileSheet(
 ox::Error loadSpriteTileSheet(
 		Context &ctx,
 		CompactTileSheet const&ts,
-		bool loadDefaultPalette) noexcept {
+		bool const loadDefaultPalette) noexcept {
 	OX_REQUIRE(tsd, normalizeTileSheet(ts));
 	oxTracef("nostalgia.gfx.gl", "loadSpriteTexture: { w: {}, h: {} }", tsd.width, tsd.height);
 	ctx.spriteBlocks.tex = renderer::createTexture(tsd.width, tsd.height, tsd.pixels.data());
@@ -669,8 +669,8 @@ ox::Error loadSpriteTileSheet(
 void setBgTile(
 		Context &ctx,
 		uint_t bgIdx,
-		int column,
-		int row,
+		int const column,
+		int const row,
 		BgTile const&tile) noexcept {
 	oxTracef(
 			"nostalgia.gfx.setBgTile",
@@ -698,7 +698,7 @@ void setBgTile(
 	cbb.updated = true;
 }
 
-void clearBg(Context &ctx, uint_t bgIdx) noexcept {
+void clearBg(Context &ctx, uint_t const bgIdx) noexcept {
 	auto &cbb = ctx.cbbs[static_cast<std::size_t>(bgIdx)];
 	initBackgroundBufferObjects(cbb);
 	cbb.updated = true;
@@ -714,51 +714,49 @@ uint8_t bgStatus(Context &ctx) noexcept {
 	return out;
 }
 
-void setBgStatus(Context &ctx, uint32_t status) noexcept {
+void setBgStatus(Context &ctx, uint32_t const status) noexcept {
 	for (uint_t i = 0; i < ctx.cbbs.size(); ++i) {
 		ctx.backgrounds[i].enabled = (status >> i) & 1;
 	}
 }
 
-bool bgStatus(Context &ctx, uint_t bg) noexcept {
+bool bgStatus(Context &ctx, uint_t const bg) noexcept {
 	return ctx.backgrounds[bg].enabled;
 }
 
-void setBgStatus(Context&ctx, uint_t bg, bool status) noexcept {
+void setBgStatus(Context&ctx, uint_t const bg, bool const status) noexcept {
 	ctx.backgrounds[bg].enabled = status;
 }
 
-void setBgBpp(Context&, unsigned, unsigned) noexcept {}
-
-void setBgCbb(Context &ctx, uint_t bgIdx, uint_t cbbIdx) noexcept {
+void setBgCbb(Context &ctx, uint_t const bgIdx, uint_t const cbbIdx) noexcept {
 	auto &bg = ctx.backgrounds[bgIdx];
 	bg.cbbIdx = cbbIdx;
 }
 
-void setBgPriority(Context &ctx, uint_t bgIdx, uint_t priority) noexcept {
+void setBgPriority(Context &ctx, uint_t const bgIdx, uint_t const priority) noexcept {
 	auto &bg = ctx.backgrounds[bgIdx];
 	bg.priority = static_cast<float>(priority & 0b11);
 }
 
-void hideSprite(Context &ctx, uint_t idx) noexcept {
+void hideSprite(Context &ctx, uint_t const idx) noexcept {
 	auto &s = ctx.spriteStates[idx];
 	s.enabled = false;
 	renderer::setSprite(ctx, idx, s);
 }
 
-void showSprite(Context &ctx, uint_t idx) noexcept {
+void showSprite(Context &ctx, uint_t const idx) noexcept {
 	auto &s = ctx.spriteStates[idx];
 	s.enabled = true;
 	renderer::setSprite(ctx, idx, s);
 }
 
-void setSprite(Context &ctx, uint_t idx, Sprite const&sprite) noexcept {
+void setSprite(Context &ctx, uint_t const idx, Sprite const&sprite) noexcept {
 	auto &s = ctx.spriteStates[idx];
 	s = sprite;
 	renderer::setSprite(ctx, idx, s);
 }
 
-uint_t spriteCount(Context &ctx) noexcept {
+uint_t spriteCount(Context const &ctx) noexcept {
 	return ctx.spriteCount;
 }
 
@@ -768,7 +766,7 @@ ox::Size drawSize(int scale) noexcept {
 	return {240 * scale, 160 * scale};
 }
 
-void draw(gfx::Context &ctx, ox::Size const&renderSz) noexcept {
+void draw(Context &ctx, ox::Size const&renderSz) noexcept {
 	glViewport(0, 0, renderSz.width, renderSz.height);
 	glEnable(GL_DEPTH_TEST);
 	glEnable(GL_BLEND);
@@ -783,7 +781,7 @@ void draw(gfx::Context &ctx, ox::Size const&renderSz) noexcept {
 	glDisable(GL_BLEND);
 }
 
-void draw(gfx::Context &ctx, int scale) noexcept {
+void draw(Context &ctx, int scale) noexcept {
 	draw(ctx, drawSize(scale));
 }