new bloom render tasks, setup util and hdr bloom code example

framework/opengl_renderer/CMakeLists.txt

@@ -179,6 +179,49 @@ target_link_libraries(blur_render_task
 	engine
 )
 
+############# bloom_extraction render task ###########
+
+add_library(bloom_extraction_render_task
+	src/mm/opengl/render_tasks/bloom_extraction.hpp
+	src/mm/opengl/render_tasks/bloom_extraction.cpp
+)
+
+target_include_directories(bloom_extraction_render_task PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/src")
+
+target_link_libraries(bloom_extraction_render_task
+	opengl_renderer_s
+	engine
+)
+
+############# bloom_combine render task ###########
+
+add_library(bloom_combine_render_task
+	src/mm/opengl/render_tasks/bloom_combine.hpp
+	src/mm/opengl/render_tasks/bloom_combine.cpp
+)
+
+target_include_directories(bloom_combine_render_task PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/src")
+
+target_link_libraries(bloom_combine_render_task
+	opengl_renderer_s
+	engine
+)
+
+############# composition render task ###########
+# intendet for bloom compositing and tonemapping
+
+add_library(composition_render_task
+	src/mm/opengl/render_tasks/composition.hpp
+	src/mm/opengl/render_tasks/composition.cpp
+)
+
+target_include_directories(composition_render_task PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/src")
+
+target_link_libraries(composition_render_task
+	opengl_renderer_s
+	engine
+)
+
 ############# tilemap renderer ###########
 
 add_library(tilemap_render_task
@@ -210,6 +253,21 @@ target_link_libraries(fast_sky_render_task
 	engine
 )
 
+############# bloom ###########
+
+add_library(bloom
+	src/mm/opengl/bloom.hpp
+	src/mm/opengl/bloom.cpp
+)
+
+target_include_directories(bloom PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/src")
+
+target_link_libraries(bloom
+	bloom_extraction_render_task
+	blur_render_task
+	bloom_combine_render_task
+)
+
 ########################
 
 if (BUILD_TESTING)

framework/opengl_renderer/src/mm/opengl/bloom.cpp

@@ -0,0 +1,158 @@
+#include "./bloom.hpp"
+
+#include <mm/opengl/render_tasks/bloom_extraction.hpp>
+#include <mm/opengl/render_tasks/blur.hpp>
+#include <mm/opengl/render_tasks/bloom_combine.hpp>
+
+#include <mm/opengl/fbo_builder.hpp>
+#include <mm/opengl/texture_loader.hpp>
+
+namespace MM::OpenGL {
+
+using namespace entt::literals;
+
+void setup_bloom(
+	MM::Engine& engine,
+	const std::string color_src_tex,
+	const size_t bloom_phases,
+	const float bloom_in_scale,
+	const float bloom_phase_scale
+) {
+	assert(bloom_phases > 1);
+	auto& rs = engine.getService<MM::Services::OpenGLRenderer>();
+	auto& rm_t = MM::ResourceManager<MM::OpenGL::Texture>::ref();
+	auto [w, h] = engine.getService<MM::Services::SDLService>().getWindowSize();
+
+#ifdef MM_OPENGL_3_GLES
+	#if 0 // NOPE!!
+	// TODO: caps at 1, invest in half float?
+	const auto bloom_internal_format = GL_RGB565; // prolly fine
+	const auto bloom_format_type = GL_UNSIGNED_BYTE;
+	#else
+	const auto bloom_internal_format = GL_RGB16F;
+	const auto bloom_format_type = GL_FLOAT;
+	#endif
+#else
+	const auto bloom_internal_format = GL_RGB16F;
+	const auto bloom_format_type = GL_FLOAT;
+#endif
+
+	{ // bloom in (bloom extraction)
+		rm_t.reload<MM::OpenGL::TextureLoaderEmpty>(
+			"bloom_in",
+			bloom_internal_format,
+			w * bloom_in_scale, h * bloom_in_scale,
+			GL_RGB, bloom_format_type
+		);
+		{ // filter
+			rm_t.get("bloom_in"_hs)->bind(0);
+			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);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		}
+
+		rs.targets["bloom_extraction"] = MM::OpenGL::FBOBuilder::start()
+			.attachTexture(rm_t.get("bloom_in"_hs), GL_COLOR_ATTACHMENT0)
+			.setResizeFactors(bloom_in_scale, bloom_in_scale)
+			.setResize(true)
+			.finish();
+		assert(rs.targets["bloom_extraction"]);
+	}
+
+	// blur textures and fbos
+	for (size_t i = 1; i <= bloom_phases; i++) {
+		// TODO: further dedup
+		std::string tex_out_name {"blur_out" + std::to_string(i)};
+		auto tex_out_id = entt::hashed_string::value(tex_out_name.c_str());
+		rm_t.reload<MM::OpenGL::TextureLoaderEmpty>(
+			tex_out_id,
+			bloom_internal_format,
+			w * bloom_in_scale * glm::pow(bloom_phase_scale, i), h * bloom_in_scale * glm::pow(bloom_phase_scale, i),
+			GL_RGB, bloom_format_type
+		);
+		{ // filter
+			rm_t.get(tex_out_id)->bind(0);
+			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);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		}
+
+		std::string tex_tmp_name {"blur_tmp" + std::to_string(i)};
+		auto tex_tmp_id = entt::hashed_string::value(tex_tmp_name.c_str());
+		rm_t.reload<MM::OpenGL::TextureLoaderEmpty>(
+			tex_tmp_id,
+			bloom_internal_format,
+			w * bloom_in_scale * glm::pow(bloom_phase_scale, i), h * bloom_in_scale * glm::pow(bloom_phase_scale, i),
+			GL_RGB, bloom_format_type
+		);
+		{ // filter
+			rm_t.get(tex_tmp_id)->bind(0);
+			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);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		}
+
+		rs.targets[tex_out_name] = MM::OpenGL::FBOBuilder::start()
+			.attachTexture(rm_t.get(tex_out_id), GL_COLOR_ATTACHMENT0)
+			.setResizeFactors(bloom_in_scale * glm::pow(bloom_phase_scale, i), bloom_in_scale * glm::pow(bloom_phase_scale, i))
+			.setResize(true)
+			.finish();
+		assert(rs.targets[tex_out_name]);
+
+		rs.targets[tex_tmp_name] = MM::OpenGL::FBOBuilder::start()
+			.attachTexture(rm_t.get(tex_tmp_id), GL_COLOR_ATTACHMENT0)
+			.setResizeFactors(bloom_in_scale * glm::pow(bloom_phase_scale, i), bloom_in_scale * glm::pow(bloom_phase_scale, i))
+			.setResize(true)
+			.finish();
+		assert(rs.targets[tex_tmp_name]);
+	}
+
+	{ // render tasks
+		auto& extraction = rs.addRenderTask<MM::OpenGL::RenderTasks::BloomExtraction>(engine);
+		extraction.src_tex = color_src_tex;
+		extraction.target_fbo = "bloom_extraction";
+
+		const glm::vec2 blur_factor {1.f, 1.f};
+
+		{ // blur rt
+			std::string prev_out_tex = "bloom_in";
+			for (size_t i = 1; i <= bloom_phases; i++) {
+				auto& blur = rs.addRenderTask<MM::OpenGL::RenderTasks::Blur>(engine);
+				// h
+				blur.in_tex = prev_out_tex;
+				blur.temp_fbo = "blur_tmp" + std::to_string(i);
+				// v
+				blur.temp_tex = "blur_tmp" + std::to_string(i);
+				blur.out_fbo = "blur_out" + std::to_string(i);
+				blur.out_tex = "blur_out" + std::to_string(i);
+				blur.tex_offset_factor = blur_factor * glm::vec2{2.f, 1.f}; // the input texture is double the size
+
+				// old blur:
+				//blur.tex_offset = {1.f/(w * bloom_in_scale * bloom_in_scale), 1.f/(h * bloom_in_scale * bloom_in_scale)};
+
+				prev_out_tex = blur.out_tex;
+			}
+		}
+
+		// combine passes
+		for (size_t i = bloom_phases; i > 1; i--) {
+			auto& combine = rs.addRenderTask<MM::OpenGL::RenderTasks::BloomCombine>(engine);
+			if (i == bloom_phases) {
+				combine.tex0 = "blur_out" + std::to_string(i);
+			} else {
+				combine.tex0 = "blur_tmp" + std::to_string(i);
+			}
+			combine.tex1 = "blur_out" + std::to_string(i-1);
+			combine.target_fbo = "blur_tmp" + std::to_string(i-1); // -> blur_tmpi-1
+		}
+	}
+}
+
+} // MM::OpenGL
+

framework/opengl_renderer/src/mm/opengl/bloom.hpp

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <string>
+
+#include "./render_task.hpp"
+
+namespace MM::OpenGL {
+
+	// helper function to setup a bloom blur and recombine chain
+	// creates (texture) rendertarget, fbos and rendertasks
+	// outputs blur to "blur_tmp1" texture
+	//
+	// you still need to add the Composition rendertask (or eqv) your self, eg:
+	//	auto& comp = rs.addRenderTask<MM::OpenGL::RenderTasks::Composition>(engine);
+	//	comp.color_tex = "hdr_color";
+	//	comp.bloom_tex = "blur_tmp1";
+	//	comp.target_fbo = "display";
+	void setup_bloom(
+		MM::Engine& engine,
+		const std::string color_src_tex = "hdr_color", // texture to extract color from
+		const size_t bloom_phases = 5, // number of downsampled blurs (4 prob fine for 720, 5 for 1080)
+		const float bloom_in_scale = 0.5f, // scale of bloom extraction layer (1 - 0.5 best, lower for more perf)
+		const float bloom_phase_scale = 0.5f // ammount of scaling per downsampling
+	);
+
+} // MM::OpenGL
+

framework/opengl_renderer/src/mm/opengl/render_task.hpp

@@ -30,5 +30,5 @@ namespace MM::OpenGL {
 			//virtual void reload(void) {} // TODO: remove
 			//virtual std::vector<const char*> getShaderPaths(void) {return {};} // TODO: remove
 	};
-}
+} // MM:OpenGL
 

framework/opengl_renderer/src/mm/opengl/render_tasks/bloom_combine.cpp

@@ -0,0 +1,161 @@
+#include "./bloom_combine.hpp"
+
+#include <mm/fs_const_archiver.hpp>
+#include <mm/services/opengl_renderer.hpp>
+#include <mm/opengl/texture.hpp>
+
+#include <tracy/Tracy.hpp>
+
+namespace MM::OpenGL::RenderTasks {
+
+BloomCombine::BloomCombine(Engine& engine) {
+	float vertices[] = {
+		-1.f, 1.f,
+		-1.f, -1.f,
+		1.f, -1.f,
+		1.f, -1.f,
+		1.f, 1.f,
+		-1.f, 1.f,
+	};
+
+	_vertexBuffer = std::make_unique<Buffer>(vertices, 2 * 6 * sizeof(float), GL_STATIC_DRAW);
+	_vao = std::make_unique<VertexArrayObject>();
+	_vao->bind();
+	_vertexBuffer->bind(GL_ARRAY_BUFFER);
+
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), 0);
+
+	_vertexBuffer->unbind(GL_ARRAY_BUFFER);
+	_vao->unbind();
+
+	setupShaderFiles();
+	_shader = Shader::createF(engine, vertexPath, fragmentPath);
+	assert(_shader != nullptr);
+}
+
+BloomCombine::~BloomCombine(void) {
+}
+
+void BloomCombine::render(Services::OpenGLRenderer& rs, Engine& engine) {
+	ZoneScopedN("RenderTasks::BloomCombine::render");
+
+	rs.targets[target_fbo]->bind(FrameBufferObject::W);
+	{ // TODO: move to fbo
+		GLsizei width {0};
+		GLsizei height {0};
+		{ // get size of fb <.<
+			auto& fbo_tex_arr = rs.targets[target_fbo]->_texAttachments;
+			if (fbo_tex_arr.empty()) {
+				//GLint o_type {0};
+				//glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &o_type);
+				//if (o_type == GL_NONE) {
+					//// default framebuffer or error
+					//SPDLOG_INFO("gl none");
+				//}
+
+				// nah, just assume screen res
+				std::tie(width, height) = engine.getService<Services::SDLService>().getWindowSize();
+			} else {
+				auto& target_fbo_tex = rs.targets[target_fbo]->_texAttachments.front();
+				width = target_fbo_tex->width;
+				height = target_fbo_tex->height;
+			}
+		}
+		glViewport(0, 0, width, height);
+	}
+
+
+	glDisable(GL_DEPTH_TEST);
+	glDisable(GL_BLEND);
+
+	_shader->bind();
+	_vertexBuffer->bind(GL_ARRAY_BUFFER);
+	_vao->bind();
+
+	auto& rm = MM::ResourceManager<Texture>::ref();
+
+	auto tex_0 = rm.get(entt::hashed_string::value(tex0.c_str()));
+	tex_0->bind(0);
+
+	auto tex_1 = rm.get(entt::hashed_string::value(tex1.c_str()));
+	tex_1->bind(1);
+
+	// assign image units
+	_shader->setUniform1i("_tex0", 0);
+	_shader->setUniform1i("_tex1", 1);
+
+	glDrawArrays(GL_TRIANGLES, 0, 6);
+
+	_vao->unbind();
+	_vertexBuffer->unbind(GL_ARRAY_BUFFER);
+	_shader->unbind();
+}
+
+void BloomCombine::reloadShaders(Engine& engine) {
+	auto tmp_shader = Shader::createF(engine, vertexPath, fragmentPath);
+	if (tmp_shader) {
+		_shader = tmp_shader;
+	}
+}
+
+void BloomCombine::setupShaderFiles(void) {
+	FS_CONST_MOUNT_FILE(vertexPath,
+GLSL_VERSION_STRING
+R"(
+#ifdef GL_ES
+	precision mediump float;
+#endif
+
+in vec2 _vertexPosition;
+out vec2 _uv;
+
+void main() {
+	gl_Position = vec4(_vertexPosition, 0, 1);
+	_uv = vec2(_vertexPosition.x * 0.5 + 0.5, _vertexPosition.y * 0.5 + 0.5);
+})")
+
+	FS_CONST_MOUNT_FILE(fragmentPath,
+GLSL_VERSION_STRING
+R"(
+#ifdef GL_ES
+	precision mediump float;
+#endif
+
+// tent sampling
+#include "/shaders/builtin/sampling.glsl"
+
+uniform sampler2D _tex0;
+uniform sampler2D _tex1;
+
+in vec2 _uv;
+
+out vec3 _out_color;
+
+vec3 tentSampling() {
+	// i hope the pipeline caches this
+	ivec2 tex0_size = textureSize(_tex0, 0); // TODO: lod
+	vec2 tex0_texel_step = vec2(1.0) / vec2(tex0_size);
+
+	return sampling2D_tent3x3_vec3(
+		_tex0,
+		_uv,
+		tex0_texel_step
+	);
+}
+
+vec3 simpleSampling() {
+	return texture(_tex0, _uv).rgb;
+}
+
+void main() {
+#ifdef SIMPLE_SAMPLING
+	_out_color = texture(_tex1, _uv).rgb + simpleSampling();
+#else
+	_out_color = texture(_tex1, _uv).rgb + tentSampling();
+#endif
+})")
+}
+
+} // MM::OpenGL::RenderTasks
+

framework/opengl_renderer/src/mm/opengl/render_tasks/bloom_combine.hpp

@@ -0,0 +1,40 @@
+#pragma once
+
+#include <mm/opengl/render_task.hpp>
+#include <mm/opengl/shader.hpp>
+#include <mm/opengl/buffer.hpp>
+#include <mm/opengl/vertex_array_object.hpp>
+
+namespace MM::OpenGL::RenderTasks {
+
+	class BloomCombine : public RenderTask {
+		private:
+			std::shared_ptr<Shader> _shader;
+			std::unique_ptr<Buffer> _vertexBuffer;
+			std::unique_ptr<VertexArrayObject> _vao;
+
+		public:
+			BloomCombine(Engine& engine);
+			~BloomCombine(void);
+
+			const char* name(void) override { return "BloomCombine"; }
+
+			void render(Services::OpenGLRenderer& rs, Engine& engine) override;
+
+		public:
+			const char* vertexPath {"shader/combine_render_task/vert.glsl"};
+			const char* fragmentPath {"shader/combine_render_task/frag.glsl"};
+
+			std::string target_fbo {"display"};
+
+			std::string tex0 {"tex0"}; // lower res
+			std::string tex1 {"tex1"};
+
+			void reloadShaders(Engine& engine);
+
+		private:
+			void setupShaderFiles(void);
+	};
+
+} // MM::OpenGL::RenderTasks
+

framework/opengl_renderer/src/mm/opengl/render_tasks/bloom_extraction.cpp

@@ -0,0 +1,114 @@
+#include "./bloom_extraction.hpp"
+
+#include <mm/services/opengl_renderer.hpp>
+#include <mm/fs_const_archiver.hpp>
+#include <mm/opengl/texture.hpp>
+
+#include <tracy/Tracy.hpp>
+
+namespace MM::OpenGL::RenderTasks {
+
+BloomExtraction::BloomExtraction(Engine& engine) {
+	float vertices[] = {
+		-1.f, 1.f,
+		-1.f, -1.f,
+		1.f, -1.f,
+		1.f, -1.f,
+		1.f, 1.f,
+		-1.f, 1.f,
+	};
+
+	_vertexBuffer = std::make_unique<Buffer>(vertices, 2 * 6 * sizeof(float), GL_STATIC_DRAW);
+	_vao = std::make_unique<VertexArrayObject>();
+	_vao->bind();
+	_vertexBuffer->bind(GL_ARRAY_BUFFER);
+
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), 0);
+
+	_vertexBuffer->unbind(GL_ARRAY_BUFFER);
+	_vao->unbind();
+
+	setupShaderFiles();
+	_shader = Shader::createF(engine, vertexPath, fragmentPath);
+	assert(_shader != nullptr);
+}
+
+BloomExtraction::~BloomExtraction(void) {
+}
+
+void BloomExtraction::render(Services::OpenGLRenderer& rs, Engine&) {
+	ZoneScopedN("RenderTasks::BloomExtraction::render");
+
+	auto& target_fbo_ = rs.targets[target_fbo];
+	target_fbo_->bind(FrameBufferObject::W);
+	auto& target_fbo_tex = target_fbo_->_texAttachments.front();
+	glViewport(0, 0, target_fbo_tex->width, target_fbo_tex->height);
+
+	glDisable(GL_DEPTH_TEST);
+	glDisable(GL_BLEND);
+
+	_shader->bind();
+	_vertexBuffer->bind(GL_ARRAY_BUFFER);
+	_vao->bind();
+
+	auto& rm = MM::ResourceManager<Texture>::ref();
+
+	auto tex = rm.get(entt::hashed_string::value(src_tex.c_str()));
+	tex->bind(0);
+
+	_shader->setUniform1i("color_tex", 0);
+
+	glDrawArrays(GL_TRIANGLES, 0, 6);
+
+	_vao->unbind();
+	_vertexBuffer->unbind(GL_ARRAY_BUFFER);
+	_shader->unbind();
+}
+
+void BloomExtraction::reloadShaders(Engine& engine) {
+	auto tmp_shader = Shader::createF(engine, vertexPath, fragmentPath);
+	if (tmp_shader) {
+		_shader = tmp_shader;
+	}
+}
+
+void BloomExtraction::setupShaderFiles(void) {
+	FS_CONST_MOUNT_FILE(vertexPath,
+GLSL_VERSION_STRING
+R"(
+#ifdef GL_ES
+	precision mediump float;
+#endif
+
+in vec2 _vertexPosition;
+out vec2 _uv;
+
+void main() {
+	gl_Position = vec4(_vertexPosition, 0, 1);
+	_uv = vec2(_vertexPosition.x * 0.5 + 0.5, _vertexPosition.y * 0.5 + 0.5);
+})")
+
+	FS_CONST_MOUNT_FILE(fragmentPath,
+GLSL_VERSION_STRING
+R"(
+#ifdef GL_ES
+	precision mediump float;
+#endif
+
+uniform sampler2D color_tex;
+
+in vec2 _uv;
+
+out vec3 _out_color;
+
+void main() {
+	vec3 color = texture(color_tex, _uv).rgb;
+
+	// TODO: expose threshold
+	_out_color = max(vec3(0.0), color - vec3(1.0));
+})")
+}
+
+} // MM::OpenGL::RenderTasks
+

framework/opengl_renderer/src/mm/opengl/render_tasks/bloom_extraction.hpp

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <mm/opengl/render_task.hpp>
+#include <mm/opengl/shader.hpp>
+#include <mm/opengl/buffer.hpp>
+#include <mm/opengl/vertex_array_object.hpp>
+
+namespace MM::OpenGL::RenderTasks {
+
+	class BloomExtraction : public RenderTask {
+		private:
+			std::shared_ptr<Shader> _shader;
+			std::unique_ptr<Buffer> _vertexBuffer;
+			std::unique_ptr<VertexArrayObject> _vao;
+
+		public:
+			BloomExtraction(Engine& engine);
+			~BloomExtraction(void);
+
+			const char* name(void) override { return "BloomExtraction"; }
+
+			void render(Services::OpenGLRenderer& rs, Engine& engine) override;
+
+		public:
+			const char* vertexPath {"shader/bloom_extraction_render_task/vert.glsl"};
+			const char* fragmentPath {"shader/bloom_extraction_render_task/frag.glsl"};
+
+			std::string target_fbo {"display"};
+
+			std::string src_tex {"hdr_color"};
+
+			void reloadShaders(Engine& engine);
+
+		private:
+			void setupShaderFiles(void);
+	};
+
+} // MM::OpenGL::RenderTasks
+

framework/opengl_renderer/src/mm/opengl/render_tasks/blur.cpp

@@ -36,10 +36,8 @@ Blur::Blur(Engine& engine) {
 	_vao->unbind();
 
 	setupShaderFiles();
-	_hShader = Shader::createF(engine, vertexPath, fragmentHPath);
-	assert(_hShader != nullptr);
-	_vShader = Shader::createF(engine, vertexPath, fragmentVPath);
-	assert(_vShader != nullptr);
+	_shader = Shader::createF(engine, vertexPath, fragmentPath);
+	assert(_shader != nullptr);
 }
 
 Blur::~Blur(void) {
@@ -57,17 +55,19 @@ void Blur::render(Services::OpenGLRenderer& rs, Engine&) {
 	auto tex_out = rm_t.get(entt::hashed_string::value(out_tex.c_str())); // TODO: perf problems
 	auto tex_temp = rm_t.get(entt::hashed_string::value(temp_tex.c_str())); // TODO: perf problems
 
+	_shader->bind();
+	_vertexBuffer->bind(GL_ARRAY_BUFFER);
+	_vao->bind();
+
+	_shader->setUniform2f("tex_offset_factor", tex_offset_factor);
+
 	{ // horizontal
 		rs.targets[temp_fbo]->bind(FrameBufferObject::W);
 
-		_hShader->bind();
-		_vertexBuffer->bind(GL_ARRAY_BUFFER);
-		_vao->bind();
-
 		glViewport(0, 0, tex_temp->width, tex_temp->height);
 		tex_in->bind(0); // read
 
-		_hShader->setUniform2f("tex_offset", tex_offset);
+		_shader->setUniform1i("horizontal", 1);
 
 		glDrawArrays(GL_TRIANGLES, 0, 6);
 	}
@@ -75,21 +75,15 @@ void Blur::render(Services::OpenGLRenderer& rs, Engine&) {
 	{ // vertical
 		rs.targets[out_fbo]->bind(FrameBufferObject::W);
 
-		_vShader->bind();
-		_vertexBuffer->bind(GL_ARRAY_BUFFER);
-		_vao->bind();
-
 		glViewport(0, 0, tex_out->width, tex_out->height);
 		tex_temp->bind(0); // read
 
-		_vShader->setUniform2f("tex_offset", tex_offset);
+		_shader->setUniform1i("horizontal", 0);
 
 		glDrawArrays(GL_TRIANGLES, 0, 6);
 	}
 
 	_vao->unbind();
-	_vertexBuffer->unbind(GL_ARRAY_BUFFER);
-	_vShader->unbind();
 }
 
 void Blur::setupShaderFiles(void) {
@@ -108,9 +102,7 @@ void main() {
 	_tex_uv = _vertexPosition * 0.5 + 0.5;
 })")
 
-	// TODO: deduplicate
-
-	FS_CONST_MOUNT_FILE(fragmentHPath,
+	FS_CONST_MOUNT_FILE(fragmentPath,
 GLSL_VERSION_STRING
 R"(
 #ifdef GL_ES
@@ -120,54 +112,19 @@ R"(
 uniform sampler2D tex0;
 in vec2 _tex_uv;
 
-//uniform bool horizontal;
-const bool horizontal = true;
-uniform vec2 tex_offset;
+uniform bool horizontal;
+//const bool horizontal = true;
+uniform vec2 tex_offset_factor;
 
 const float weight[5] = float[] (0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);
 
 out vec4 _out_color;
 
 void main() {
-	//vec2 tex_offset = vec2(1.0) / vec2(textureSize(tex0, 0)); // gets size of single texel
 	vec3 result = texture(tex0, _tex_uv).rgb * weight[0]; // current fragment's contribution
 
-	if (horizontal) {
-		for (int i = 1; i < 5; i++) {
-			result += texture(tex0, _tex_uv + vec2(tex_offset.x * float(i), 0.0)).rgb * weight[i];
-			result += texture(tex0, _tex_uv - vec2(tex_offset.x * float(i), 0.0)).rgb * weight[i];
-		}
-	} else {
-		for (int i = 1; i < 5; i++) {
-			result += texture(tex0, _tex_uv + vec2(0.0, tex_offset.y * float(i))).rgb * weight[i];
-			result += texture(tex0, _tex_uv - vec2(0.0, tex_offset.y * float(i))).rgb * weight[i];
-		}
-	}
-
-	_out_color = vec4(result, 1.0);
-})")
-
-	FS_CONST_MOUNT_FILE(fragmentVPath,
-GLSL_VERSION_STRING
-R"(
-#ifdef GL_ES
-	precision mediump float;
-#endif
-
-uniform sampler2D tex0;
-in vec2 _tex_uv;
-
-//uniform bool horizontal;
-const bool horizontal = false;
-uniform vec2 tex_offset;
-
-const float weight[5] = float[] (0.227027, 0.1945946, 0.1216216, 0.054054, 0.016216);
-
-out vec4 _out_color;
-
-void main() {
-	//vec2 tex_offset = vec2(1.0) / vec2(textureSize(tex0, 0)); // gets size of single texel
-	vec3 result = texture(tex0, _tex_uv).rgb * weight[0]; // current fragment's contribution
+	vec2 tex_offset = vec2(1.0) / vec2(textureSize(tex0, 0).xy); // gets size of single texel
+	tex_offset *= tex_offset_factor;
 
 	if (horizontal) {
 		for (int i = 1; i < 5; i++) {

framework/opengl_renderer/src/mm/opengl/render_tasks/blur.hpp

@@ -17,8 +17,7 @@ namespace MM::OpenGL::RenderTasks {
 	// this task expects to read and write to textures
 	class Blur : public RenderTask {
 		private:
-			std::shared_ptr<Shader> _hShader;
-			std::shared_ptr<Shader> _vShader;
+			std::shared_ptr<Shader> _shader;
 			std::unique_ptr<Buffer> _vertexBuffer;
 			std::unique_ptr<VertexArrayObject> _vao;
 
@@ -31,20 +30,19 @@ namespace MM::OpenGL::RenderTasks {
 			void render(Services::OpenGLRenderer& rs, Engine& engine) override;
 
 		public:
-			const char* vertexPath = "shader/blur_render_task/vert.glsl";
-			const char* fragmentHPath = "shader/blur_render_task/frag_h.glsl";
-			const char* fragmentVPath = "shader/blur_render_task/frag_v.glsl";
+			const char* vertexPath {"shader/blur_render_task/vert.glsl"};
+			const char* fragmentPath {"shader/blur_render_task/frag_h.glsl"};
 
-			std::string out_fbo = "blur_io";
-			std::string temp_fbo = "blur_temp";
+			std::string out_fbo {"blur_io"};
+			std::string temp_fbo {"blur_temp"};
 
 			// bc of it beeing a 2 pass, we need to flipflop
-			std::string in_tex = "blur_io";
-			std::string out_tex = "blur_io";
-			std::string temp_tex = "blur_temp";
+			std::string in_tex {"blur_io"};
+			std::string out_tex {"blur_io"};
+			std::string temp_tex {"blur_temp"};
 
-			// determines the kernel lookup offset. "ideal" is 1/tex_size
-			glm::vec2 tex_offset {0.001f, 0.001f};
+			// kernel lookup offset factor
+			glm::vec2 tex_offset_factor {1.f, 1.f};
 
 		private:
 			void setupShaderFiles(void);

framework/opengl_renderer/src/mm/opengl/render_tasks/composition.cpp

@@ -0,0 +1,164 @@
+#include "./composition.hpp"
+
+#include <mm/fs_const_archiver.hpp>
+#include <mm/services/opengl_renderer.hpp>
+#include <mm/opengl/texture.hpp>
+
+#include <tracy/Tracy.hpp>
+
+namespace MM::OpenGL::RenderTasks {
+
+Composition::Composition(MM::Engine& engine) {
+	float vertices[] = {
+		-1.f, 1.f,
+		-1.f, -1.f,
+		1.f, -1.f,
+		1.f, -1.f,
+		1.f, 1.f,
+		-1.f, 1.f,
+	};
+
+	_vertexBuffer = std::make_unique<MM::OpenGL::Buffer>(vertices, 2 * 6 * sizeof(float), GL_STATIC_DRAW);
+	_vao = std::make_unique<MM::OpenGL::VertexArrayObject>();
+	_vao->bind();
+	_vertexBuffer->bind(GL_ARRAY_BUFFER);
+
+	glEnableVertexAttribArray(0);
+	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(GLfloat), 0);
+
+	_vertexBuffer->unbind(GL_ARRAY_BUFFER);
+	_vao->unbind();
+
+	setupShaderFiles();
+	_shader = MM::OpenGL::Shader::createF(engine, vertexPath, fragmentPath);
+	assert(_shader != nullptr);
+}
+
+Composition::~Composition(void) {
+}
+
+void Composition::render(MM::Services::OpenGLRenderer& rs, MM::Engine& engine) {
+	ZoneScopedN("RenderTasks::Composition::render");
+
+	rs.targets[target_fbo]->bind(MM::OpenGL::FrameBufferObject::W);
+	{ // TODO: move to fbo
+		GLsizei width {0};
+		GLsizei height {0};
+		{ // get size of fb <.<
+			auto& fbo_tex_arr = rs.targets[target_fbo]->_texAttachments;
+			if (fbo_tex_arr.empty()) {
+				//GLint o_type {0};
+				//glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &o_type);
+				//if (o_type == GL_NONE) {
+					//// default framebuffer or error
+					//SPDLOG_INFO("gl none");
+				//}
+
+				// nah, just assume screen res
+				std::tie(width, height) = engine.getService<MM::Services::SDLService>().getWindowSize();
+			} else {
+				auto& target_fbo_tex = rs.targets[target_fbo]->_texAttachments.front();
+				width = target_fbo_tex->width;
+				height = target_fbo_tex->height;
+			}
+		}
+		glViewport(0, 0, width, height);
+	}
+
+
+	glDisable(GL_DEPTH_TEST);
+	glDisable(GL_BLEND);
+
+	_shader->bind();
+	_vertexBuffer->bind(GL_ARRAY_BUFFER);
+	_vao->bind();
+
+	auto& rm = MM::ResourceManager<MM::OpenGL::Texture>::ref();
+
+	auto tex_a = rm.get(entt::hashed_string::value(color_tex.c_str()));
+	tex_a->bind(0);
+
+	auto tex_n = rm.get(entt::hashed_string::value(bloom_tex.c_str()));
+	tex_n->bind(1);
+
+	// assign image units
+	_shader->setUniform1i("color_tex", 0);
+	_shader->setUniform1i("bloom_tex", 1);
+
+	_shader->setUniform1f("bloom_factor", bloom_factor);
+
+	glDrawArrays(GL_TRIANGLES, 0, 6);
+
+	_vao->unbind();
+	_vertexBuffer->unbind(GL_ARRAY_BUFFER);
+	_shader->unbind();
+}
+
+void Composition::reloadShaders(MM::Engine& engine) {
+	auto tmp_shader = MM::OpenGL::Shader::createF(engine, vertexPath, fragmentPath);
+	if (tmp_shader) {
+		_shader = tmp_shader;
+	}
+}
+
+void Composition::setupShaderFiles(void) {
+	FS_CONST_MOUNT_FILE(vertexPath,
+GLSL_VERSION_STRING
+R"(
+#ifdef GL_ES
+	precision mediump float;
+#endif
+
+in vec2 _vertexPosition;
+out vec2 _uv;
+
+void main() {
+	gl_Position = vec4(_vertexPosition, 0, 1);
+	_uv = vec2(_vertexPosition.x * 0.5 + 0.5, _vertexPosition.y * 0.5 + 0.5);
+})")
+
+	FS_CONST_MOUNT_FILE(fragmentPath,
+GLSL_VERSION_STRING
+R"(
+#ifdef GL_ES
+	precision mediump float;
+#endif
+
+#include "/shaders/builtin/tonemapping.glsl"
+
+uniform sampler2D color_tex;
+uniform sampler2D bloom_tex;
+
+// high bc 32bit on cpu
+uniform highp float bloom_factor;
+
+in vec2 _uv;
+
+out vec3 _out_color;
+
+void main() {
+	vec3 color = texture(color_tex, _uv).rgb;
+	vec3 bloom = texture(bloom_tex, _uv).rgb;
+
+	vec3 comp = color + bloom * vec3(bloom_factor);
+
+#if 0
+	const vec3 tint = vec3(1.5, 0.8, 1.1);
+	comp *= tint;
+#endif
+
+	//// reinhart + gamma
+	//_out_color = pow(comp / (comp + vec3(1.0)), vec3(1.0 / 2.2));
+
+	// makes more sense pre bloom
+	//comp *= vec3(pow(2.0, -1.0)); // pre expose, -1 fstops
+
+	//_out_color = tonemapReinhard(comp);
+	_out_color = tonemapACESFilm(comp); // looks right
+	//_out_color = pow(tonemapACESFilm(pow(comp, vec3(2.2))), vec3(1.0/2.2)); // insane saturation o.O
+	//_out_color = pow(tonemapACESFilm(comp), vec3(1.0/2.2)); // looks just wrong
+})")
+}
+
+} // MM::OpenGL::RenderTasks
+

framework/opengl_renderer/src/mm/opengl/render_tasks/composition.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <mm/opengl/render_task.hpp>
+#include <mm/opengl/shader.hpp>
+#include <mm/opengl/buffer.hpp>
+#include <mm/opengl/vertex_array_object.hpp>
+
+namespace MM::OpenGL::RenderTasks {
+
+	class Composition : public MM::OpenGL::RenderTask {
+		private:
+			std::shared_ptr<MM::OpenGL::Shader> _shader;
+			std::unique_ptr<MM::OpenGL::Buffer> _vertexBuffer;
+			std::unique_ptr<MM::OpenGL::VertexArrayObject> _vao;
+
+		public:
+			Composition(MM::Engine& engine);
+			~Composition(void);
+
+			const char* name(void) override { return "Composition"; }
+
+			void render(MM::Services::OpenGLRenderer& rs, MM::Engine& engine) override;
+
+		public:
+			const char* vertexPath {"shader/composition_render_task/vert.glsl"};
+			const char* fragmentPath {"shader/composition_render_task/frag.glsl"};
+
+			std::string target_fbo {"display"};
+
+			std::string color_tex {"hdr_color"};
+			std::string bloom_tex {"bloom"};
+
+			float bloom_factor {1.f};
+
+			void reloadShaders(MM::Engine& engine);
+
+		private:
+			void setupShaderFiles(void);
+	};
+
+} // MM::OpenGL::RenderTasks
+

framework/opengl_renderer/test/CMakeLists.txt

@@ -160,3 +160,30 @@ target_link_libraries(fast_sky_render_task_test
 
 add_test(NAME fast_sky_render_task_test COMMAND fast_sky_render_task_test)
 
+################# hdr bloom example
+
+add_executable(hdr_bloom_pipeline_example ./hdr_bloom_pipeline_example.cpp)
+
+target_link_libraries(hdr_bloom_pipeline_example
+	opengl_renderer_s
+	organizer_scene
+	clear_render_task
+	blit_fb_render_task
+	simple_rect_render_task
+
+	#bloom_extraction_render_task
+	#blur_render_task
+	#bloom_combine_render_task
+	bloom
+	composition_render_task
+
+	simple_velocity_system
+	transform_system
+
+	random
+
+	gtest_main
+)
+
+add_test(NAME hdr_bloom_pipeline_example COMMAND hdr_bloom_pipeline_example)
+

framework/opengl_renderer/test/hdr_bloom_pipeline_example.cpp

@@ -0,0 +1,291 @@
+#include <gtest/gtest.h>
+
+#include <mm/engine.hpp>
+
+#include <mm/services/filesystem.hpp>
+#include <mm/services/sdl_service.hpp>
+#include <mm/services/organizer_scene.hpp>
+#include <mm/services/opengl_renderer.hpp>
+
+#include <entt/entity/registry.hpp>
+#include <entt/entity/organizer.hpp>
+
+#include <mm/opengl/render_tasks/clear.hpp>
+#include <mm/opengl/render_tasks/blit_fb.hpp>
+#include <mm/opengl/render_tasks/simple_rect.hpp>
+//#include <mm/opengl/render_tasks/bloom_extraction.hpp>
+//#include <mm/opengl/render_tasks/blur.hpp>
+//#include <mm/opengl/render_tasks/bloom_combine.hpp>
+#include <mm/opengl/bloom.hpp>
+#include <mm/opengl/render_tasks/composition.hpp>
+
+#include <mm/components/position2d.hpp>
+#include <mm/components/position2d_zoffset.hpp>
+#include <mm/components/scale2d.hpp>
+#include <mm/components/rotation2d.hpp>
+#include <mm/components/velocity2d_rotation.hpp>
+#include <mm/components/position3d.hpp>
+#include <mm/components/transform4x4.hpp>
+#include <mm/components/color.hpp>
+
+#include <mm/systems/simple_velocity_system2d.hpp>
+#include <mm/systems/transform.hpp>
+
+#include <mm/opengl/fbo_builder.hpp>
+#include <mm/opengl/texture_loader.hpp>
+
+#include <mm/random/srng.hpp>
+
+using namespace entt::literals;
+
+const char* argv0;
+
+static void setup_textures(MM::Engine& engine) {
+	auto& rm_t = MM::ResourceManager<MM::OpenGL::Texture>::ref();
+	auto [w, h] = engine.getService<MM::Services::SDLService>().getWindowSize();
+
+	// we dont have a gbuffer in this example
+	{ // gbuffer
+		// depth
+#ifdef MM_OPENGL_3_GLES
+		rm_t.reload<MM::OpenGL::TextureLoaderEmpty>(
+			"depth",
+			GL_DEPTH_COMPONENT24, // d16 is the onlyone for gles 2 (TODO: test for 3)
+			w, h,
+			GL_DEPTH_COMPONENT, GL_UNSIGNED_INT
+		);
+#else
+		rm_t.reload<MM::OpenGL::TextureLoaderEmpty>(
+			"depth",
+			GL_DEPTH_COMPONENT32F, // TODO: stencil?
+			w, h,
+			GL_DEPTH_COMPONENT, GL_FLOAT
+		);
+#endif
+
+#if 0
+		// albedo
+		rm_t.reload<MM::OpenGL::TextureLoaderEmpty>(
+			"albedo",
+#ifdef MM_OPENGL_3_GLES
+			GL_RGB565,
+#else
+			GL_RGBA8, // waste of A
+#endif
+			w, h,
+			GL_RGB, GL_UNSIGNED_BYTE
+		);
+#endif
+
+#if 0
+		// normal
+		rm_t.reload<MM::OpenGL::TextureLoaderEmpty>(
+			"normal",
+			// prolly fine, but need to remapp to -1,1
+#ifdef MM_OPENGL_3_GLES
+			GL_RGB565,
+#else
+			GL_RGBA8, // waste of A
+#endif
+			w, h,
+			GL_RGB, GL_UNSIGNED_BYTE
+		);
+#endif
+	}
+
+	const float render_scale = 1.f;
+
+	// hdr color gles3 / webgl2
+	rm_t.reload<MM::OpenGL::TextureLoaderEmpty>(
+		"hdr_color",
+		GL_RGBA16F,
+		w * render_scale, h * render_scale,
+		GL_RGBA,
+		GL_HALF_FLOAT
+	);
+	{ // filter
+		rm_t.get("hdr_color"_hs)->bind(0);
+		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);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	}
+}
+
+static void setup_fbos(MM::Engine& engine) {
+	auto& rs = engine.getService<MM::Services::OpenGLRenderer>();
+	auto& rm_t = MM::ResourceManager<MM::OpenGL::Texture>::ref();
+
+	const float render_scale = 1.f;
+
+#if 0
+	rs.targets["clear_opaque"] = MM::OpenGL::FBOBuilder::start()
+		.attachTexture(rm_t.get("albedo"_hs), GL_COLOR_ATTACHMENT0)
+		.attachTexture(rm_t.get("opaque_depth"_hs), GL_DEPTH_ATTACHMENT)
+		.setResize(true)
+		.finish();
+	assert(rs.targets["clear_opaque"]);
+
+	rs.targets["clear_opaque_normal"] = MM::OpenGL::FBOBuilder::start()
+		.attachTexture(rm_t.get("normal"_hs), GL_COLOR_ATTACHMENT0)
+		.setResize(true)
+		.finish();
+	assert(rs.targets["clear_opaque"]);
+
+	rs.targets["opaque"] = MM::OpenGL::FBOBuilder::start()
+		.attachTexture(rm_t.get("albedo"_hs), GL_COLOR_ATTACHMENT0)
+		.attachTexture(rm_t.get("normal"_hs), GL_COLOR_ATTACHMENT1)
+		.attachTexture(rm_t.get("opaque_depth"_hs), GL_DEPTH_ATTACHMENT)
+		.setResize(true)
+		.finish();
+	assert(rs.targets["opaque"]);
+
+	rs.targets["tmp_read"] = MM::OpenGL::FBOBuilder::start()
+		.attachTexture(rm_t.get("normal"_hs), GL_COLOR_ATTACHMENT0)
+		.setResize(false)
+		.finish();
+	assert(rs.targets["tmp_read"]);
+
+	rs.targets["depth_read"] = MM::OpenGL::FBOBuilder::start()
+		.attachTexture(rm_t.get("opaque_depth"_hs), GL_DEPTH_ATTACHMENT)
+		.setResize(false)
+		.finish();
+	assert(rs.targets["depth_read"]);
+
+	rs.targets["deferred_shading"] = MM::OpenGL::FBOBuilder::start()
+		.attachTexture(rm_t.get("hdr_color"_hs), GL_COLOR_ATTACHMENT0)
+		.setResize(true)
+		.finish();
+	assert(rs.targets["deferred_shading"]);
+#endif
+	rs.targets["game_view"] = MM::OpenGL::FBOBuilder::start()
+		.attachTexture(rm_t.get("hdr_color"_hs), GL_COLOR_ATTACHMENT0)
+		.attachTexture(rm_t.get("depth"_hs), GL_DEPTH_ATTACHMENT)
+		.setResizeFactors(render_scale, render_scale)
+		.setResize(true)
+		.finish();
+	assert(rs.targets["game_view"]);
+}
+
+TEST(hdr_bloom_pipeline, it) {
+	MM::Engine engine;
+
+	auto& sdl_ss = engine.addService<MM::Services::SDLService>();
+	ASSERT_TRUE(engine.enableService<MM::Services::SDLService>());
+
+	sdl_ss.createGLWindow("hdr_bloom_pipeline_example", 1280, 720);
+
+	engine.addService<MM::Services::OrganizerSceneService>();
+	ASSERT_TRUE(engine.enableService<MM::Services::OrganizerSceneService>());
+
+	bool provide_ret = engine.provide<MM::Services::SceneServiceInterface, MM::Services::OrganizerSceneService>();
+	ASSERT_TRUE(provide_ret);
+	auto& scene = engine.tryService<MM::Services::SceneServiceInterface>()->getScene();
+
+	engine.addService<MM::Services::FilesystemService>(argv0, "hdr_bloom_pipeline_example");
+	ASSERT_TRUE(engine.enableService<MM::Services::FilesystemService>());
+
+	auto& rs = engine.addService<MM::Services::OpenGLRenderer>();
+	ASSERT_TRUE(engine.enableService<MM::Services::OpenGLRenderer>());
+
+	{ // setup rendering
+		// TODO: split vertically
+		setup_textures(engine);
+		setup_fbos(engine);
+
+		// clear
+		auto& clear_opaque = rs.addRenderTask<MM::OpenGL::RenderTasks::Clear>(engine);
+		clear_opaque.target_fbo = "game_view";
+		// clears all color attachments
+		clear_opaque.r = 0.f;
+		clear_opaque.g = 0.f;
+		clear_opaque.b = 0.f;
+		clear_opaque.a = 1.f;
+		clear_opaque.mask = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT;
+
+		{ // render, whatever
+			MM::OpenGL::RenderTasks::SimpleRect& bsrr_rend = rs.addRenderTask<MM::OpenGL::RenderTasks::SimpleRect>(engine);
+			bsrr_rend.target_fbo = "game_view";
+		}
+
+		// rn does rt too
+		MM::OpenGL::setup_bloom(engine);
+
+		// not part of setup_bloom
+		auto& comp = rs.addRenderTask<MM::OpenGL::RenderTasks::Composition>(engine);
+		comp.color_tex = "hdr_color";
+		comp.bloom_tex = "blur_tmp1";
+		comp.target_fbo = "display";
+	}
+
+	scene.on_construct<MM::Components::Position2D>().connect<&entt::registry::emplace_or_replace<MM::Components::Position2D_ZOffset>>();
+	scene.on_construct<MM::Components::Position2D>().connect<&entt::registry::emplace_or_replace<MM::Components::Position3D>>();
+	scene.on_construct<MM::Components::Position2D>().connect<&entt::registry::emplace_or_replace<MM::Components::Transform4x4>>();
+	scene.on_construct<MM::Components::Position2D>().connect<&entt::registry::emplace_or_replace<MM::Components::DirtyTransformTag>>();
+
+	scene.on_update<MM::Components::Position2D>().connect<&entt::registry::emplace_or_replace<MM::Components::DirtyTransformTag>>();
+	scene.on_update<MM::Components::Position2D_ZOffset>().connect<&entt::registry::emplace_or_replace<MM::Components::DirtyTransformTag>>();
+	scene.on_update<MM::Components::Position3D>().connect<&entt::registry::emplace_or_replace<MM::Components::DirtyTransformTag>>();
+	scene.on_update<MM::Components::Scale2D>().connect<&entt::registry::emplace_or_replace<MM::Components::DirtyTransformTag>>();
+	scene.on_update<MM::Components::Rotation2D>().connect<&entt::registry::emplace_or_replace<MM::Components::DirtyTransformTag>>(); // in this example only rotation is touched
+
+
+	// setup v system
+	auto& org = scene.set<entt::organizer>();
+	org.emplace<MM::Systems::simple_rotational_velocity_patching>("simple_rotational_velocity_patching");
+	org.emplace<MM::Systems::position3d_from_2d>("position3d_from_2d");
+	org.emplace<MM::Systems::transform3d_translate>("transform3d_translate");
+	org.emplace<MM::Systems::transform3d_rotate2d>("transform3d_rotate2d");
+	org.emplace<MM::Systems::transform3d_scale2d>("transform3d_scale2d");
+	org.emplace<MM::Systems::transform_clear_dirty>("transform_clear_dirty");
+
+
+	// HACK: instead you would switch to this scene
+	engine.getService<MM::Services::OrganizerSceneService>().updateOrganizerVertices(scene);
+
+	MM::Random::SRNG rng{42};
+
+	for (int i = 0; i < 5; i++) {
+		auto e = scene.create();
+		auto& p = scene.emplace<MM::Components::Position2D>(e);
+		p.pos.x = 0.f;
+		p.pos.y = 25.f - i * 10.f;
+
+		auto& s = scene.emplace<MM::Components::Scale2D>(e);
+		s.scale = {50.f, i*0.2f + 0.1f};
+
+		auto& col = scene.emplace<MM::Components::Color>(e);
+		col.color = {3.f, 3.f, 3.f, 1.f};
+	}
+
+	for (int i = 0; i < 10; i++) {
+		auto e = scene.create();
+		auto& p = scene.emplace<MM::Components::Position2D>(e);
+		p.pos.x = i * 9.f - 40;
+
+		// zoffset is created by event
+
+		auto& s = scene.emplace<MM::Components::Scale2D>(e);
+		s.scale = {5,5};
+
+		scene.emplace<MM::Components::Rotation2D>(e);
+
+		auto& v = scene.emplace<MM::Components::Velocity2DRotation>(e);
+		v.rot_vel = i * 0.3f;
+
+		auto& col = scene.emplace<MM::Components::Color>(e);
+		col.color = {rng.zeroToOne()*2.f, rng.zeroToOne()*2.f, rng.zeroToOne()*2.f, 1.f};
+	}
+
+	engine.run();
+}
+
+int main(int argc, char** argv) {
+	argv0 = argv[0];
+
+	::testing::InitGoogleTest(&argc, argv);
+
+	return RUN_ALL_TESTS();
+}
+