/*
 * Copyright 2016 - 2023 Gary Talent (gary@drinkingtea.net). All rights reserved.
 */

#include <imgui_impl_opengl3.h>

#include <ox/std/array.hpp>
#include <ox/std/fmt.hpp>
#include <ox/std/vec.hpp>

#include <nostalgia/glutils/glutils.hpp>

#include <nostalgia/core/context.hpp>
#include <nostalgia/core/config.hpp>
#include <nostalgia/core/gfx.hpp>

namespace nostalgia::core {

void ImGui_Impl_NewFrame() noexcept;

namespace renderer {

constexpr uint64_t TileRows = 128;
constexpr uint64_t TileColumns = 128;
constexpr uint64_t TileCount = TileRows * TileColumns;
constexpr uint64_t SpriteCount = 128;
constexpr uint64_t BgVertexVboRows = 4;
constexpr uint64_t BgVertexVboRowLength = 4;
constexpr uint64_t BgVertexVboLength = BgVertexVboRows * BgVertexVboRowLength;
constexpr uint64_t BgVertexEboLength = 6;
constexpr uint64_t SpriteVertexVboRows = 256;
constexpr uint64_t SpriteVertexVboRowLength = 5;
constexpr uint64_t SpriteVertexVboLength = SpriteVertexVboRows * SpriteVertexVboRowLength;
constexpr uint64_t SpriteVertexEboLength = 6;

struct CBB: public glutils::BufferSet {
	bool updated = false;
	constexpr CBB() noexcept {
		vertices.resize(TileCount * BgVertexVboLength);
		elements.resize(TileCount * BgVertexEboLength);
	}
};

struct SpriteBlockset: public glutils::BufferSet {
	bool updated = false;
	constexpr SpriteBlockset() noexcept {
		vertices.resize(SpriteCount * SpriteVertexVboLength);
		elements.resize(SpriteCount * SpriteVertexEboLength);
	}
};

struct Background {
	bool enabled = false;
	unsigned cbbIdx = 0;
};

struct Sprite {
	bool enabled = false;
};

struct GlImplData {
	glutils::GLProgram bgShader;
	glutils::GLProgram spriteShader;
	int64_t prevFpsCheckTime = 0;
	uint64_t draws = 0;
	bool mainViewEnabled = true;
	ox::Array<CBB, 4> cbbs;
	SpriteBlockset spriteBlocks;
	ox::Array<Sprite, 128> spriteStates;
	ox::Array<Background, 4> backgrounds;
	ox::Optional<ox::Size> renderSize;
};

constexpr ox::StringView bgvshadTmpl = R"(
	{}
	in vec2 vTexCoord;
	in vec2 vPosition;
	out vec2 fTexCoord;
	uniform float vXScale;
	uniform float vTileHeight;
	void main() {
		float xScaleInvert = 1.0 - vXScale;
		gl_Position = vec4(
				vPosition.x * vXScale - xScaleInvert, vPosition.y,
				0.0, 1.0);
		fTexCoord = vTexCoord * vec2(1, vTileHeight);
	})";

constexpr ox::StringView bgfshadTmpl = R"(
	{}
	out vec4 outColor;
	in vec2 fTexCoord;
	uniform sampler2D image;
	uniform vec4 fPalette[256];
	void main() {
		int idx = int(texture(image, fTexCoord).rgb.r * 256);
		outColor = fPalette[idx];
		//outColor = vec4(0.0, 0.7, 1.0, 1.0);
	})";

constexpr ox::StringView spritevshadTmpl = R"(
	{}
	in float vEnabled;
	in vec2 vTexCoord;
	in vec2 vPosition;
	out vec2 fTexCoord;
	uniform float vXScale;
	uniform float vTileHeight;
	void main() {
		float xScaleInvert = 1.0 - vXScale;
		gl_Position = vec4(
				vPosition.x * vXScale - xScaleInvert, vPosition.y,
				0.0, 1.0);
		fTexCoord = vTexCoord * vec2(1, vTileHeight) * vec2(vEnabled, vEnabled);
	})";

constexpr ox::StringView spritefshadTmpl = bgfshadTmpl;

[[nodiscard]]
static constexpr auto bgVertexRow(unsigned x, unsigned y) noexcept {
	return y * TileRows + x;
}

static void setSpriteBufferObject(Context*,
                                  unsigned vi,
											 float enabled,
                                  float x, float y,
                                  unsigned textureRow,
                                  unsigned flipX,
                                  float *vbo,
                                  GLuint *ebo) noexcept {
	// don't worry, this memcpy gets optimized to something much more ideal
	constexpr float xmod = 0.1f;
	constexpr float ymod = 0.1f;
	x *= xmod;
	y *= -ymod;
	x -= 1.f;
	y += 1.f - ymod;
	const auto textureRowf = static_cast<float>(textureRow);
	const float L = flipX ? 1 : 0;
	const float R = flipX ? 0 : 1;
	const ox::Array<float, SpriteVertexVboLength> vertices {
		enabled,        x,        y, L, textureRowf + 1, // bottom left
		enabled, x + xmod,        y, R, textureRowf + 1, // bottom right
		enabled, x + xmod, y + ymod, R, textureRowf + 0, // top right
		enabled,        x, y + ymod, L, textureRowf + 0, // top left
	};
	memcpy(vbo, vertices.data(), sizeof(vertices));
	const ox::Array<GLuint, SpriteVertexEboLength> elms {
		vi + 0, vi + 1, vi + 2,
		vi + 2, vi + 3, vi + 0,
	};
	memcpy(ebo, elms.data(), sizeof(elms));
}

static void setTileBufferObject(Context*,
                                unsigned vi,
                                float x,
                                float y,
                                unsigned textureRow,
                                float *vbo,
                                GLuint *ebo) noexcept {
	// don't worry, this memcpy gets optimized to something much more ideal
	constexpr float ymod = 0.1f;
	constexpr float xmod = 0.1f;
	x *= xmod;
	y *= -ymod;
	x -= 1.0f;
	y += 1.0f - ymod;
	const auto textureRowf = static_cast<float>(textureRow);
	const ox::Array<float, BgVertexVboLength> vertices {
		       x,        y, 0, textureRowf + 1, // bottom left
		x + xmod,        y, 1, textureRowf + 1, // bottom right
		x + xmod, y + ymod, 1, textureRowf + 0, // top right
		       x, y + ymod, 0, textureRowf + 0, // top left
	};
	memcpy(vbo, vertices.data(), sizeof(vertices));
	const ox::Array<GLuint, BgVertexEboLength> elms {
		vi + 0, vi + 1, vi + 2,
		vi + 2, vi + 3, vi + 0,
	};
	memcpy(ebo, elms.data(), sizeof(elms));
}

static void initSpriteBufferObjects(Context *ctx, glutils::BufferSet *bs) noexcept {
	for (auto i = 0u; i < SpriteCount; ++i) {
		auto vbo = &bs->vertices[i * static_cast<std::size_t>(SpriteVertexVboLength)];
		auto ebo = &bs->elements[i * static_cast<std::size_t>(SpriteVertexEboLength)];
		setSpriteBufferObject(ctx, i * SpriteVertexVboRows, 0, 0, 0, 0, false, vbo, ebo);
	}
}

static void initBackgroundBufferObjects(Context *ctx, glutils::BufferSet *bg) noexcept {
	for (auto x = 0u; x < TileColumns; ++x) {
		for (auto y = 0u; y < TileRows; ++y) {
			const auto i = bgVertexRow(x, y);
			auto vbo = &bg->vertices[i * static_cast<std::size_t>(BgVertexVboLength)];
			auto ebo = &bg->elements[i * static_cast<std::size_t>(BgVertexEboLength)];
			setTileBufferObject(ctx, i * BgVertexVboRows, static_cast<float>(x), static_cast<float>(y), 0, vbo, ebo);
		}
	}
}

static void initSpritesBufferset(Context *ctx, GLuint shader, glutils::BufferSet *bs) noexcept {
	// vao
	bs->vao = glutils::generateVertexArrayObject();
	glBindVertexArray(bs->vao);
	// vbo & ebo
	bs->vbo = glutils::generateBuffer();
	bs->ebo = glutils::generateBuffer();
	initSpriteBufferObjects(ctx, bs);
	glutils::sendVbo(*bs);
	glutils::sendEbo(*bs);
	// vbo layout
	auto enabledAttr = static_cast<GLuint>(glGetAttribLocation(shader, "vEnabled"));
	glEnableVertexAttribArray(enabledAttr);
	glVertexAttribPointer(enabledAttr, 1, GL_FLOAT, GL_FALSE, SpriteVertexVboRowLength * sizeof(float), nullptr);
	auto posAttr = static_cast<GLuint>(glGetAttribLocation(shader, "vPosition"));
	glEnableVertexAttribArray(posAttr);
	glVertexAttribPointer(posAttr, 2, GL_FLOAT, GL_FALSE, SpriteVertexVboRowLength * sizeof(float),
	                      reinterpret_cast<void*>(1 * sizeof(float)));
	auto texCoordAttr = static_cast<GLuint>(glGetAttribLocation(shader, "vTexCoord"));
	glEnableVertexAttribArray(texCoordAttr);
	glVertexAttribPointer(texCoordAttr, 2, GL_FLOAT, GL_FALSE, SpriteVertexVboRowLength * sizeof(float),
	                      reinterpret_cast<void*>(3 * sizeof(float)));
}

static void initBackgroundBufferset(Context *ctx, GLuint shader, glutils::BufferSet *bg) noexcept {
	// vao
	bg->vao = glutils::generateVertexArrayObject();
	glBindVertexArray(bg->vao);
	// vbo & ebo
	bg->vbo = glutils::generateBuffer();
	bg->ebo = glutils::generateBuffer();
	initBackgroundBufferObjects(ctx, bg);
	glutils::sendVbo(*bg);
	glutils::sendEbo(*bg);
	// vbo layout
	auto posAttr = static_cast<GLuint>(glGetAttribLocation(shader, "vPosition"));
	glEnableVertexAttribArray(posAttr);
	glVertexAttribPointer(posAttr, 2, GL_FLOAT, GL_FALSE, BgVertexVboRowLength * sizeof(float), nullptr);
	auto texCoordAttr = static_cast<GLuint>(glGetAttribLocation(shader, "vTexCoord"));
	glEnableVertexAttribArray(texCoordAttr);
	glVertexAttribPointer(texCoordAttr, 2, GL_FLOAT, GL_FALSE, BgVertexVboRowLength * sizeof(float),
	                      reinterpret_cast<void*>(2 * sizeof(float)));
}

static glutils::GLTexture loadTexture(GLsizei w, GLsizei h, const void *pixels) noexcept {
	GLuint texId = 0;
	glGenTextures(1, &texId);
	glutils::GLTexture tex(texId);
	tex.width = w;
	tex.height = h;
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, tex.id);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex.width, tex.height, 0,  GL_RGBA, GL_UNSIGNED_BYTE, pixels);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
	return tex;
}

static void tickFps(GlImplData *id) noexcept {
	++id->draws;
	if (id->draws >= 500) {
		using namespace std::chrono;
		const auto now = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
		const auto duration = static_cast<double>(now - id->prevFpsCheckTime) / 1000.0;
		const auto fps = static_cast<int>(static_cast<double>(id->draws) / duration);
		if constexpr(config::UserlandFpsPrint) {
			oxOutf("FPS: {}\n", fps);
		}
		oxTracef("nostalgia::core::gfx::fps", "FPS: {}", fps);
		id->prevFpsCheckTime = now;
		id->draws = 0;
	}
}

static void drawBackground(CBB *cbb) noexcept {
	glBindVertexArray(cbb->vao);
	if (cbb->updated) {
		cbb->updated = false;
		glutils::sendVbo(*cbb);
	}
	glBindTexture(GL_TEXTURE_2D, cbb->tex);
	glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(cbb->elements.size()), GL_UNSIGNED_INT, nullptr);
}

static void drawBackgrounds(core::Context *ctx, GlImplData *id) noexcept {
	// load background shader and its uniforms
	glUseProgram(id->bgShader);
	const auto uniformXScale = static_cast<GLint>(glGetUniformLocation(id->bgShader, "vXScale"));
	const auto uniformTileHeight = static_cast<GLint>(glGetUniformLocation(id->bgShader, "vTileHeight"));
	const auto [wi, hi] = gl::getRenderSize(ctx);
	const auto wf = static_cast<float>(wi);
	const auto hf = static_cast<float>(hi);
	glUniform1f(uniformXScale, hf / wf);
	for (const auto &bg : id->backgrounds) {
		if (bg.enabled) {
			auto &cbb = id->cbbs[bg.cbbIdx];
			const auto tileRows = cbb.tex.height / TileHeight;
			glUniform1f(uniformTileHeight, 1.0f / static_cast<float>(tileRows));
			drawBackground(&cbb);
		}
	}
}

static void drawSprites(core::Context *ctx, GlImplData *id) noexcept {
	glUseProgram(id->spriteShader);
	auto &sb = id->spriteBlocks;
	const auto uniformXScale = static_cast<GLint>(glGetUniformLocation(id->bgShader, "vXScale"));
	const auto uniformTileHeight = static_cast<GLint>(glGetUniformLocation(id->spriteShader, "vTileHeight"));
	const auto [wi, hi] = gl::getRenderSize(ctx);
	const auto wf = static_cast<float>(wi);
	const auto hf = static_cast<float>(hi);
	glUniform1f(uniformXScale, hf / wf);
	// update vbo
	glBindVertexArray(sb.vao);
	if (sb.updated) {
		sb.updated = false;
		glutils::sendVbo(sb);
	}
	// set vTileHeight uniform
	const auto tileRows = sb.tex.height / TileHeight;
	glUniform1f(uniformTileHeight, 1.0f / static_cast<float>(tileRows));
	// draw
	glBindTexture(GL_TEXTURE_2D, sb.tex);
	glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(sb.elements.size()), GL_UNSIGNED_INT, nullptr);
}

ox::Error init(Context *ctx) noexcept {
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	const auto bgVshad = ox::sfmt(bgvshadTmpl, glutils::GlslVersion);
	const auto bgFshad = ox::sfmt(bgfshadTmpl, glutils::GlslVersion);
	const auto spriteVshad = ox::sfmt(spritevshadTmpl, glutils::GlslVersion);
	const auto spriteFshad = ox::sfmt(spritefshadTmpl, glutils::GlslVersion);
	const auto id = ox::make<GlImplData>();
	ctx->setRendererData(id);
	oxReturnError(glutils::buildShaderProgram(bgVshad.c_str(), bgFshad.c_str()).moveTo(&id->bgShader));
	oxReturnError(glutils::buildShaderProgram(spriteVshad.c_str(), spriteFshad.c_str()).moveTo(&id->spriteShader));
	for (auto &bg : id->cbbs) {
		initBackgroundBufferset(ctx, id->bgShader, &bg);
	}
	initSpritesBufferset(ctx, id->spriteShader, &id->spriteBlocks);
	ImGui_ImplOpenGL3_Init(glutils::GlslVersion);
	return {};
}

void shutdown(Context*, void *rendererData) noexcept {
	const auto id = reinterpret_cast<GlImplData*>(rendererData);
	ox::safeDelete(id);
}

static void loadPalette(GLuint shaderPgrm, const Palette &pal, bool firstIsTransparent = false) noexcept {
	static constexpr std::size_t ColorCnt = 256;
	ox::Array<GLfloat, ColorCnt * 4> palette{};
	for (auto i = 0u; const auto c : pal.colors) {
		palette[i++] = redf(c);
		palette[i++] = greenf(c);
		palette[i++] = bluef(c);
		palette[i++] = 255;
	}
	if (firstIsTransparent) {
		palette[3] = 0;
	}
	glUseProgram(shaderPgrm);
	const auto uniformPalette = static_cast<GLint>(glGetUniformLocation(shaderPgrm, "fPalette"));
	glUniform4fv(uniformPalette, ColorCnt, palette.data());
}

void loadBgPalette(void *rendererData, const Palette &pal) noexcept {
	const auto id = static_cast<GlImplData*>(rendererData);
	loadPalette(id->bgShader, pal);
}

void loadSpritePalette(void *rendererData, const Palette &pal) noexcept {
	const auto id = static_cast<GlImplData*>(rendererData);
	loadPalette(id->spriteShader, pal, true);
}

void loadBgTexture(void *rendererData, unsigned cbbIdx, const void *pixels, int w, int h) noexcept {
	oxTracef("nostalgia::core::gfx::gl", "loadBgTexture: { cbbIdx: {}, w: {}, h: {} }", cbbIdx, w, h);
	const auto id = static_cast<GlImplData*>(rendererData);
	id->cbbs[cbbIdx].tex = loadTexture(w, h, pixels);
}

void loadSpriteTexture(void *rendererData, const void *pixels, int w, int h) noexcept {
	oxTracef("nostalgia::core::gfx::gl", "loadSpriteTexture: { w: {}, h: {} }", w, h);
	const auto id = static_cast<GlImplData*>(rendererData);
	id->spriteBlocks.tex = loadTexture(w, h, pixels);
}

}

void setBgCbb(Context *ctx, unsigned bgIdx, unsigned cbbIdx) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	auto &bg = id->backgrounds[bgIdx];
	bg.cbbIdx = cbbIdx;
}

uint8_t bgStatus(Context *ctx) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	uint8_t out = 0;
	for (unsigned i = 0; i < id->cbbs.size(); ++i) {
		out |= id->backgrounds[i].enabled << i;
	}
	return out;
}

void setBgStatus(Context *ctx, uint32_t status) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	for (unsigned i = 0; i < id->cbbs.size(); ++i) {
		id->backgrounds[i].enabled = (status >> i) & 1;
	}
}

bool bgStatus(Context *ctx, unsigned bg) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	return id->backgrounds[bg].enabled;
}

void setBgStatus(Context *ctx, unsigned bg, bool status) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	id->backgrounds[bg].enabled = status;
}


void draw(Context *ctx) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	renderer::tickFps(id);
	ImGui_ImplOpenGL3_NewFrame();
	ImGui_Impl_NewFrame();
	if constexpr(config::ImGuiEnabled) {
		ImGui::NewFrame();
	}
	// clear screen
	glClearColor(0, 0, 0, 1);
	glClear(GL_COLOR_BUFFER_BIT);
	// render
	if (id->mainViewEnabled) {
		gl::drawMainView(ctx);
	}
	for (const auto cd : ctx->drawers) {
		cd->draw(ctx);
	}
	if constexpr(config::ImGuiEnabled) {
		ImGui::Render();
		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
	}
}

void clearTileLayer(Context *ctx, unsigned bgIdx) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	auto &bg = id->cbbs[static_cast<std::size_t>(bgIdx)];
	initBackgroundBufferObjects(ctx, &bg);
	bg.updated = true;
}

void hideSprite(Context *ctx, unsigned idx) noexcept {
	auto &id = *ctx->rendererData<renderer::GlImplData>();
	auto vbo = &id.spriteBlocks.vertices[idx * renderer::SpriteVertexVboLength];
	auto ebo = &id.spriteBlocks.elements[idx * renderer::SpriteVertexEboLength];
	renderer::setSpriteBufferObject(ctx, idx * renderer::SpriteVertexVboRows, 0,
	                                0, 0, 0, false, vbo, ebo);
	id.spriteBlocks.updated = true;
}

void setSprite(Context *ctx,
               unsigned idx,
               int x,
               int y,
               unsigned tileIdx,
               [[maybe_unused]] unsigned spriteShape,
               [[maybe_unused]] unsigned spriteSize,
               unsigned flipX) noexcept {
	//oxTracef("nostalgia::core::gfx::gl", "setSprite(ctx, {}, {}, {}, {}, {}, {}, {})",
	//         idx, x, y, tileIdx, spriteShape, spriteSize, flipX);
	// Tonc Table 8.4
	static constexpr ox::Array<ox::Vec<unsigned>, 12> dimensions{
		// col 0
		{1, 1}, // 0, 0
		{2, 2}, // 0, 1
		{4, 4}, // 0, 2
		{8, 8}, // 0, 3
		// col 1
		{2, 1}, // 1, 0
		{4, 1}, // 1, 1
		{4, 2}, // 1, 2
		{8, 4}, // 1, 3
		// col 2
		{1, 1}, // 2, 0
		{1, 4}, // 2, 1
		{2, 4}, // 2, 2
		{4, 8}, // 2, 3
	};
	const auto dim = dimensions[(spriteShape << 2) | spriteSize];
	const auto uX = static_cast<int>(x) % 255;
	const auto uY = static_cast<int>(y + 8) % 255 - 8;
	auto &id = *ctx->rendererData<renderer::GlImplData>();
	auto i = 0u;
	const auto set = [&](int xIt, int yIt) {
		const auto fX = static_cast<float>(uX + xIt * 8) / 8;
		const auto fY = static_cast<float>(uY + yIt * 8) / 8;
		const auto cidx = idx + i;
		auto vbo = &id.spriteBlocks.vertices[cidx * renderer::SpriteVertexVboLength];
		auto ebo = &id.spriteBlocks.elements[cidx * renderer::SpriteVertexEboLength];
		renderer::setSpriteBufferObject(ctx, cidx * renderer::SpriteVertexVboRows, 1,
												  fX, fY, tileIdx + i, flipX, vbo, ebo);
		++i;
	};
	if (!flipX) {
		for (auto yIt = 0; yIt < static_cast<int>(dim.y); ++yIt) {
			for (auto xIt = 0u; xIt < dim.x; ++xIt) {
				set(static_cast<int>(xIt), static_cast<int>(yIt));
			}
		}
	} else {
		for (auto yIt = 0u; yIt < dim.y; ++yIt) {
			for (auto xIt = dim.x - 1; xIt < ~0u; --xIt) {
				set(static_cast<int>(xIt), static_cast<int>(yIt));
			}
		}
	}
	id.spriteBlocks.updated = true;
}

void setTile(Context *ctx, unsigned bgIdx, int column, int row, uint8_t tile) noexcept {
	oxTracef(
			"nostalgia::core::gfx::setTile",
			"bgIdx: {}, column: {}, row: {}, tile: {}",
			bgIdx, column, row, tile);
	const auto id = ctx->rendererData<renderer::GlImplData>();
	const auto z = static_cast<unsigned>(bgIdx);
	const auto y = static_cast<unsigned>(row);
	const auto x = static_cast<unsigned>(column);
	const auto i = renderer::bgVertexRow(x, y);
	auto &bg = id->cbbs[z];
	auto vbo = &bg.vertices[i * renderer::BgVertexVboLength];
	auto ebo = &bg.elements[i * renderer::BgVertexEboLength];
	renderer::setTileBufferObject(
			ctx, i * renderer::BgVertexVboRows,
	      static_cast<float>(x), static_cast<float>(y),
			tile, vbo, ebo);
	bg.updated = true;
}

namespace gl {

void setMainViewEnabled(core::Context *ctx, bool enabled) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	id->mainViewEnabled = enabled;
}

void drawMainView(core::Context *ctx) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	renderer::drawBackgrounds(ctx, id);
	if (id->spriteBlocks.tex) {
		renderer::drawSprites(ctx, id);
	}
}

void setRenderSize(core::Context *ctx, int width, int height) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	id->renderSize.emplace(width, height);
}

void clearRenderSize(core::Context *ctx) noexcept {
	auto id = ctx->rendererData<renderer::GlImplData>();
	id->renderSize.reset();
}

ox::Size getRenderSize(core::Context *ctx) noexcept {
	const auto id = ctx->rendererData<renderer::GlImplData>();
	if (id->renderSize.has_value()) {
		return id->renderSize.value();
	} else {
		return core::getScreenSize(ctx);
	}
}

}

}