working particle system

assets/shader/header.glsl

@@ -4,7 +4,8 @@
 #define SSBO_ATLAS_BUFFER 1
 #define SSBO_PARTICLES_IN 2
 #define SSBO_PARTICLES_OUT 3
-#define UBO_PARTICLES_INFO 4
+#define SSBO_PARTICLES_LOOKUP 4
+#define UBO_PARTICLES_INFO 5
 
 #define TEX_ATLAS 1
 

assets/shader/model.vert

@@ -3,8 +3,9 @@
 
 layout (location = 0) in vec4 v_pos;
 layout (location = 1) in vec4 v_colour;
-layout (location = 2) in vec2 v_uv;
-layout (location = 3) in uint v_texid;
+layout (location = 2) in vec2 v_screen_offset;
+layout (location = 3) in vec2 v_uv;
+layout (location = 4) in uint v_texid;
 
 out VS_OUT {
 	vec4 pos;
@@ -23,7 +24,6 @@ void main() {
 	vout.colour = v_colour;
 	vout.uv = v_uv;
 	vout.texid = v_texid;
-	vec4 p = u_projection * vout.pos;
-	gl_Position = vec4(p.xy, 2 / (p.z + 2) - 1, p.w);
+	gl_Position = u_projection * (vout.pos + vec4(v_screen_offset, 0, 0));
 }
 

assets/shader/particles.comp

@@ -2,22 +2,28 @@
 #include "header.glsl"
 #include "random.glsl"
 
-layout (local_size_x = 32, local_size_y = 1, local_size_z = 1) in;
+layout (local_size_x = 1, local_size_y = 64, local_size_z = 1) in;
 
 struct VertType {
 	vec4 pos;
 	vec4 colour;
+	vec2 screen_offset;
 	vec2 uv;
-	float texid;
+	int texid;
 };
 
 struct ParticleType {
-	vec4 pos;		// xyz: pos, w: vel random scale
-	vec4 velocity;	// xyz: vel, w: colour random scale
+	vec4 pos;
+	vec4 vel;
+	vec4 acc;
 	vec4 colour;
+	float random_pos;
+	float random_vel;
+	float random_time;
 	float time_start;
 	float duration;
 	float size;
+	int texid;
 	int seed;
 };
 
@@ -29,34 +35,47 @@ layout (binding = SSBO_PARTICLES_OUT) writeonly buffer ParticleBufferOut {
 	VertType vertices_out[];
 };
 
+layout (binding = SSBO_PARTICLES_LOOKUP) readonly buffer ParticleLookupIn {
+	int lookup_in[];
+};
+
 layout (binding = UBO_PARTICLES_INFO) uniform ParticleInfo {
 	float p_time;
 	int p_size;
 };
 
+const vec2 QUADS[4] = {
+	vec2(0, 0),
+	vec2(1, 0),
+	vec2(0, 1),
+	vec2(1, 1)
+};
+
 void main() {
-	ParticleType particle = particles_in[gl_WorkGroupID.x];
-	int seed = particle.seed;
-	rand_mix(seed, int(gl_LocalInvocationID.x));
+	ParticleType p = particles_in[lookup_in[gl_GlobalInvocationID.x]];
 	
-	float duration = clamp((p_time - particle.time_start) / particle.duration, 0, 1);
-	vec3 velocity = normalize(vec3(
-		rand_float(seed) * 2 - 1,
-		rand_float(seed) * 2 - 1,
-		rand_float(seed) * 2 - 1
-	)) * particle.pos.w + particle.velocity.xyz;
-	vec4 colour = normalize(vec4(
-		rand_float(seed) * 2 - 1,
-		rand_float(seed) * 2 - 1,
-		rand_float(seed) * 2 - 1,
-		rand_float(seed) * 2 - 1
-	)) * particle.velocity.w + particle.colour;
-	vec3 pos = particle.pos.xyz + velocity * duration;
-	colour.a *= (1 - duration);
+	int n = p.seed;
+	rand_mix(n, int(gl_GlobalInvocationID.y));
 
-	uint v_id = gl_GlobalInvocationID.x;
-	vertices_out[v_id].pos = vec4(pos, 1);
-	vertices_out[v_id].colour = colour;
-	vertices_out[v_id].texid = TEXID_WHITE;
+	float t_total = p.duration + p.random_time * (rand_float(n)*2-1);
+	float t = clamp(p_time - p.time_start, 0, t_total);
+	float t_ratio = t / t_total;
+
+	vec3 vel = p.vel.xyz + normalize(rand_vec3(n)*2-1) * p.random_vel;
+	vec4 pos = vec4(p.pos.xyz + normalize(rand_vec3(n)*2-1) * p.random_pos + (vel + 0.5 * p.acc.xyz * t) * t, 1);
+	vec4 colour = vec4(p.colour.rgb, p.colour.a * (1 - t_ratio));
+	pos.z *= (pos.z > 0 ? 1 : 0);
+
+	mat2 uv = mat2(rand_vec2(n), rand_vec2(n));
+	uv = mat2(min(uv[0], uv[1]), max(uv[0], uv[1]));
+	uint v_id = (gl_GlobalInvocationID.x * gl_WorkGroupSize.y * p_size + gl_GlobalInvocationID.y) * 4;
+	
+	for(int i = 0; i < 4; i++) {
+		vertices_out[v_id+i].pos = pos;
+		vertices_out[v_id+i].colour = colour;
+		vertices_out[v_id+i].screen_offset = (QUADS[i]*2-1) * p.size;
+		vertices_out[v_id+i].uv = QUADS[i] * (uv[1] - uv[0]) + uv[0];
+		vertices_out[v_id+i].texid = p.texid;
+	}
 }
 

assets/shader/random.glsl

@@ -9,6 +9,18 @@ float rand_float(inout int n) {
 	return float(n) / float(0x7fffffff);
 }
 
+vec2 rand_vec2(inout int n) {
+	return vec2(rand_float(n), rand_float(n));
+}
+
+vec3 rand_vec3(inout int n) {
+	return vec3(rand_float(n), rand_float(n), rand_float(n));
+}
+
+vec4 rand_vec4(inout int n) {
+	return vec4(rand_float(n), rand_float(n), rand_float(n), rand_float(n));
+}
+
 void rand_mix(inout int n, int v) {
 	n = rand_gen(n ^ v);
 }

src/graphics/context.cpp

@@ -1,7 +1,7 @@
 
 #include "context.hpp"
+#include "../world/state.hpp"
 #include "gl/uniform.hpp"
-#include "window.hpp"
 #include <GL/glew.h>
 #include <glm/ext/matrix_clip_space.hpp>
 #include <glm/ext/matrix_float4x4.hpp>
@@ -9,15 +9,13 @@
 
 using Graphics::Context;
 
-Context::Context(GLFWwindow* window, unsigned int program) {
-	assert(window);
+Context::Context(unsigned int program) {
 	glUseProgram(program);
 	m_u_model = glGetUniformLocation(program, "u_model");
 	m_u_view = glGetUniformLocation(program, "u_view");
 	m_u_projection = glGetUniformLocation(program, "u_projection");
 	m_u_colour = glGetUniformLocation(program, "u_colour");
 	m_program = program;
-	m_window = window;
 }
 
 void Context::set_model_matrix(glm::mat4 mat) const {
@@ -38,9 +36,10 @@ void Context::set_projection_matrix(glm::mat4 mat) {
 	m_projection = mat;
 }
 
-void Context::set_player(const World::Player& player) {
-	set_projection_matrix(glm::perspective(glm::radians(90.0f), Graphics::Window::get_aspect(), 0.01f, 10.f));
-	set_view_matrix(player.get_view_matrix());
+void Context::set_from_state(const World::State& state) {
+	const World::Player& player = state.m_player;
+	set_projection_matrix(player.m_projection);
+	set_view_matrix(player.m_view);
 	m_transform = player.m_pos;
 }
 

src/graphics/context.hpp

@@ -3,12 +3,13 @@
 
 #include <glm/ext/matrix_float4x4.hpp>
 #include <glm/matrix.hpp>
-#include "../world/player.hpp"
-#include "window.hpp"
+
+namespace World {
+	struct State;
+};
 
 namespace Graphics {
 	struct Context {
-		GLFWwindow* m_window;
 		unsigned int m_program;
 		unsigned int m_u_model;
 		unsigned int m_u_view;
@@ -18,13 +19,13 @@ namespace Graphics {
 		glm::mat4 m_view;
 		glm::mat4 m_projection;
 
-		Context(GLFWwindow* window, unsigned int program);
+		Context(unsigned int program);
 
 		void set_model_matrix(glm::mat4 mat) const;
 		void set_view_matrix(glm::mat4 mat);
 		void set_projection_matrix(glm::mat4 mat);
 		void set_colour_matrix(glm::mat4 mat) const;
-		void set_player(const World::Player& player);
+		void set_from_state(const World::State& state);
 
 		glm::mat4 get_vp() const;
 	};

src/graphics/particles.cpp

@@ -1,15 +1,15 @@
 
 #include "particles.hpp"
-#include "context.hpp"
 #include "pipeline.hpp"
 #include "shader.hpp"
 #include "vertex.hpp"
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
+#include <utility>
+#include <vector>
 
 using Graphics::Particles;
 
-
 struct InfoType {
 	float m_time;
 	int m_size;
@@ -18,60 +18,86 @@ struct InfoType {
 Particles::Particles() {
 	m_time_started = glfwGetTime();
 
-	glNamedBufferStorage(m_ssbo_particles, sizeof(Type) * MAX_PARTICLES, nullptr, GL_MAP_PERSISTENT_BIT | GL_MAP_READ_BIT | GL_MAP_WRITE_BIT);
-	glNamedBufferData(m_ssbo_vertices, sizeof(Vertex) * MAX_PARTICLES, nullptr, GL_DYNAMIC_COPY);
-	glNamedBufferData(m_ubo_info, sizeof(InfoType), nullptr, GL_DYNAMIC_DRAW);
-	m_particles_mapping = (Type*)glMapNamedBuffer(m_ssbo_particles, GL_READ_WRITE);
+	std::vector<int> indices(MAX_PARTICLES*6);
+	std::vector<int> lookup(MAX_PARTICLE_GROUPS);
 
-	glBindVertexArray(m_vao);
-	glBindBuffer(GL_ARRAY_BUFFER, m_ssbo_vertices);
-	glBindVertexArray(0);
+	for(int i = 0; i < MAX_PARTICLES; i++) {
+		int i4 = i*4;
+		int i6 = i*6;
+		indices[i6+0] = i4+0;
+		indices[i6+1] = i4+1;
+		indices[i6+2] = i4+3;
+		indices[i6+3] = i4+0;
+		indices[i6+4] = i4+3;
+		indices[i6+5] = i4+2;
 	}
 
-void Particles::update(const Pipeline& pipeline) {
+	for(int i = 0; i < MAX_PARTICLE_GROUPS; i++) {
+		lookup[i] = i;
+	}
+
+	glNamedBufferStorage(m_buff_particles, sizeof(Type) * MAX_PARTICLE_GROUPS, nullptr, GL_MAP_PERSISTENT_BIT | GL_MAP_READ_BIT | GL_MAP_WRITE_BIT);
+	glNamedBufferStorage(m_buff_lookup, sizeof(int) * MAX_PARTICLE_GROUPS, lookup.data(), GL_MAP_PERSISTENT_BIT | GL_MAP_READ_BIT | GL_MAP_WRITE_BIT);
+	glNamedBufferData(m_buff_vertices, sizeof(Vertex) * MAX_PARTICLES * 4, nullptr, GL_DYNAMIC_COPY);
+	glNamedBufferData(m_buff_indices, sizeof(int) * MAX_PARTICLES * 6, indices.data(), GL_STATIC_COPY);
+	glNamedBufferData(m_buff_info, sizeof(InfoType), nullptr, GL_DYNAMIC_DRAW);
+	m_particles_mapping = (Type*)glMapNamedBuffer(m_buff_particles, GL_READ_WRITE);
+	m_lookup_mapping = (int*)glMapNamedBuffer(m_buff_lookup, GL_READ_WRITE);
+
+	Vertex::set_vertex_attribs(m_vao, m_buff_vertices);
+	glVertexArrayElementBuffer(m_vao, m_buff_indices);
+}
+
+void Particles::update() {
 	double now = get_time_diff();
 	int j = 0;
-	for(int i = 0; i < m_particles_mapping_size; i++) {
-		Type& p = m_particles_mapping[i];
-		if(p.m_time_start + p.m_duration < now) {
+	for(int i = 0; i < m_mapping_size; i++) {
+		Type& p = m_particles_mapping[m_lookup_mapping[i]];
+		if(p.m_time_start + p.m_duration > now) {
 			if(i > j) {
-				m_particles_mapping[j] = m_particles_mapping[i];
+				std::swap(m_lookup_mapping[j], m_lookup_mapping[i]);
 			}
 			j++;
 		}
 	}
-	m_particles_mapping_size = j;
+	m_mapping_size = j;
 
 	InfoType info {
 		.m_time = (float)now,
-		.m_size = m_particles_mapping_size,
+		.m_size = 1,
 	};
 
-	glNamedBufferSubData(m_ubo_info, 0, sizeof(InfoType), &info);
-	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, Shader::SSBO_PARTICLES_IN, m_ssbo_particles);
-	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, Shader::SSBO_PARTICLES_OUT, m_ssbo_vertices);
-	glBindBufferBase(GL_UNIFORM_BUFFER, Shader::UBO_PARTICLES_INFO, m_ubo_info);
-	glUseProgram(pipeline.m_program_particles);
-	glDispatchCompute(m_particles_mapping_size, 1, 1);
+	glNamedBufferSubData(m_buff_info, 0, sizeof(InfoType), &info);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, Shader::SSBO_PARTICLES_IN, m_buff_particles);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, Shader::SSBO_PARTICLES_OUT, m_buff_vertices);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, Shader::SSBO_PARTICLES_LOOKUP, m_buff_lookup);
+	glBindBufferBase(GL_UNIFORM_BUFFER, Shader::UBO_PARTICLES_INFO, m_buff_info);
+	glUseProgram(Graphics::Pipeline::CURRENT->m_program_particles);
+	glDispatchCompute(m_mapping_size, info.m_size, 1);
 }
 
 void Particles::render(const Context& ctx) const {
+	if(m_mapping_size == 0) {
+		return;
+	}
+
 	glMemoryBarrier(GL_SHADER_STORAGE_BARRIER_BIT);
-	ctx.set_colour_matrix(glm::mat4(1));
 	ctx.set_model_matrix(glm::mat4(1));
+	ctx.set_colour_matrix(glm::mat4(1));
 
 	glBindVertexArray(m_vao);
-	glDrawArrays(GL_POINTS, 0, m_particles_mapping_size);
-	glBindVertexArray(0);
+	glDrawElements(GL_TRIANGLES, m_mapping_size * PARTICLES_PER_GROUP * 6, GL_UNSIGNED_INT, 0);
 }
 
-void Particles::add(const Type& type) {
-	if(m_particles_mapping_size < MAX_PARTICLES) {
-		m_particles_mapping[m_particles_mapping_size++] = type;
+void Particles::add(Type type) {
+	if(m_mapping_size < MAX_PARTICLE_GROUPS) {
+		type.m_time_start = (float)get_time_diff();
+		type.m_seed = random();
+		m_particles_mapping[m_lookup_mapping[m_mapping_size++]] = type;
 	}
 }
 
-double Particles::get_time_diff() {
-	return m_time_started - glfwGetTime();
+double Particles::get_time_diff() const {
+	return glfwGetTime() - m_time_started;
 }
 

src/graphics/particles.hpp

@@ -7,36 +7,51 @@
 #include <glm/matrix.hpp>
 
 namespace Graphics {
-	struct Pipeline;
 	struct Particles {
 		struct Type {
 			glm::vec3 m_pos;
-			float m_random_velocity_scale;
-			glm::vec3 m_velocity;
-			float m_random_colour_scale;
-			glm::vec4 m_colour;
+			int _padding_1;
+
+			glm::vec3 m_vel;
+			int _padding_2;
+
+			glm::vec3 m_acc;
+			int _padding_3;
+
+			glm::vec4 m_colour = {1, 1, 1, 1};
+
+			float m_random_pos;
+			float m_random_vel;
+			float m_random_time;
 			float m_time_start;
+
 			float m_duration;
 			float m_size;
-			int m_seed;
+			unsigned int m_texid;
+			unsigned int m_seed;
 		};
 
-		static_assert(sizeof(Type) == 64);
+		static_assert(sizeof(Type) == 96);
 
-		static constexpr int MAX_PARTICLES = 1024;
+		static constexpr int MAX_PARTICLE_GROUPS = 1024;
+		static constexpr int PARTICLES_PER_GROUP = 64;
+		static constexpr int MAX_PARTICLES = MAX_PARTICLE_GROUPS * PARTICLES_PER_GROUP;
 
 		GL::VertexArray m_vao;
-		GL::ArrayBuffer m_ssbo_particles;
-		GL::ArrayBuffer m_ssbo_vertices;
-		GL::ArrayBuffer m_ubo_info;
+		GL::ArrayBuffer m_buff_particles;
+		GL::ArrayBuffer m_buff_lookup;
+		GL::ArrayBuffer m_buff_vertices;
+		GL::ArrayBuffer m_buff_indices;
+		GL::ArrayBuffer m_buff_info;
 		Type* m_particles_mapping;
-		int m_particles_mapping_size = 0;
+		int* m_lookup_mapping;
+		int m_mapping_size = 0;
 		double m_time_started;
 		
 		Particles();
-		void add(const Type& type);
-		double get_time_diff();
-		void update(const Pipeline& pipeline);
+		void update();
+		void add(Type type);
+		double get_time_diff() const;
 		void render(const Context& ctx) const;
 	};
 };

src/graphics/pipeline.cpp

@@ -7,6 +7,8 @@
 #include "shader/compile.hpp"
 #include "shader/link.hpp"
 #include "texture/generate_atlas.hpp"
+#include "../world/state.hpp"
+#include "../util/debug.hpp"
 
 using Graphics::Pipeline;
 
@@ -19,6 +21,9 @@ Pipeline::Pipeline() {
 
 	Graphics::Shader::link(m_program_model, {model_vert, model_frag});
 	Graphics::Shader::link(m_program_particles, {particles_comp});
+
+	CHECK_DEBUG(CURRENT == nullptr);
+	CURRENT = this;
 }
 
 bool Pipeline::should_close() const {
@@ -27,7 +32,6 @@ bool Pipeline::should_close() const {
 
 void Pipeline::update() {
 	m_window.update();
-	m_particles.update(*this);
 }
 
 void Pipeline::render(const World::State& state, const Context& ctx) const {
@@ -36,7 +40,6 @@ void Pipeline::render(const World::State& state, const Context& ctx) const {
 	glClearColor(0.1, 0.1, 0.12, 1);
 
 	state.render(ctx);
-	m_particles.render(ctx);
 	m_window.swap_buffers();
 }
 

src/graphics/pipeline.hpp

@@ -1,18 +1,21 @@
 
 #pragma once
 
-#include "context.hpp"
 #include "gl/program.hpp"
-#include "particles.hpp"
 #include "texture/generate_atlas.hpp"
+#include "context.hpp"
 #include "window.hpp"
-#include "../world/state.hpp"
+
+namespace World {
+	struct State;
+};
 
 namespace Graphics {
 	struct Pipeline {
+		static inline Pipeline* CURRENT = nullptr;
+
 		Window m_window;
 		Texture::GeneratedAtlas m_generated_atlas;
-		Particles m_particles;
 		GL::Program m_program_model;
 		GL::Program m_program_particles;
 

src/graphics/shader.hpp

@@ -5,7 +5,8 @@ namespace Graphics::Shader {
 	constexpr int SSBO_ATLAS_BUFFER = 1;
 	constexpr int SSBO_PARTICLES_IN = 2;
 	constexpr int SSBO_PARTICLES_OUT = 3;
-	constexpr int UBO_PARTICLES_INFO = 4;
+	constexpr int SSBO_PARTICLES_LOOKUP = 4;
+	constexpr int UBO_PARTICLES_INFO = 5;
 	constexpr int TEX_ATLAS = 1;
 };
 

src/graphics/texture.hpp

@@ -6,12 +6,20 @@
 namespace Graphics::Texture {
 	inline Image MISSING {"missing.png", Image::Edge::REPEATING};
 	inline Image WHITE {"white.png", Image::Edge::REPEATING};
+	inline Image CROSS {"cross.png", Image::Edge::CLAMP};
 	inline Image YELLOW_BRICK_WALL {"yellow_brick_wall.png", Image::Edge::REPEATING};
+	inline Image YELLOW_BRICK_FLOOR {"yellow_brick_floor.png", Image::Edge::REPEATING};
+	inline Image WHITE_BRICK_WALL {"white_brick_wall.png", Image::Edge::REPEATING};
+	inline Image WHITE_BRICK_FLOOR {"white_brick_floor.png", Image::Edge::REPEATING};
 
 	inline Image* const IMAGES[] {
 		&MISSING,
 		&WHITE,
+		&CROSS,
 		&YELLOW_BRICK_WALL,
+		&YELLOW_BRICK_FLOOR,
+		&WHITE_BRICK_WALL,
+		&WHITE_BRICK_FLOOR,
 	};
 };
 

src/graphics/texture/generate_atlas.cpp

@@ -5,6 +5,7 @@
 #include "atlas.hpp"
 #include "image.hpp"
 #include "uv.hpp"
+#include <iostream>
 #include <iterator>
 #include <stb/stb_rect_pack.h>
 #include <GL/glew.h>
@@ -60,8 +61,8 @@ void Graphics::Texture::generate_atlas(GeneratedAtlas& ga) {
 			src->clear_host();
 			
 			uvs[it->id] = {
-				.uv0={(it->x + offset + 0.5f) / size, (it->y + offset + 0.5f) / size},
-				.uv1={(it->x + offset + src->m_size.x - 0.5f) / size, (it->y + offset + src->m_size.y - 0.5f) / size},
+				.uv0={float(it->x + offset) / size, float(it->y + offset) / size},
+				.uv1={float(it->x + offset + src->m_size.x) / size, float(it->y + offset + src->m_size.y) / size},
 				.zpos=zpos,
 				.edges=src->m_edges,
 			};
@@ -70,6 +71,8 @@ void Graphics::Texture::generate_atlas(GeneratedAtlas& ga) {
 		}
 	}
 
+	std::cout << "Finished stitching " << size << "x" << size << "x" << atlas.m_size.z << " atlas" << std::endl;
+
 	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, Graphics::Shader::SSBO_ATLAS_BUFFER, ga.m_ssbo_id);
 	glNamedBufferData(ga.m_ssbo_id, sizeof(UV) * uvs.size(), uvs.data(), GL_STATIC_DRAW);
 

src/graphics/vertex.cpp

@@ -11,10 +11,11 @@ void Vertex::set_vertex_attribs(unsigned int vao, unsigned int vbo) {
 	glVertexArrayVertexBuffer(vao, 0, vbo, 0, sizeof(v));
 	glVertexArrayAttribFormat(vao, 0, 4, GL_FLOAT, false, Util::pointer_diff(&v, &v.m_pos));
 	glVertexArrayAttribFormat(vao, 1, 4, GL_FLOAT, false, Util::pointer_diff(&v, &v.m_colour));
-	glVertexArrayAttribFormat(vao, 2, 2, GL_FLOAT, false, Util::pointer_diff(&v, &v.m_uv));
-	glVertexArrayAttribIFormat(vao, 3, 1, GL_UNSIGNED_INT, Util::pointer_diff(&v, &v.m_texid));
+	glVertexArrayAttribFormat(vao, 2, 2, GL_FLOAT, false, Util::pointer_diff(&v, &v.m_screen_offset));
+	glVertexArrayAttribFormat(vao, 3, 2, GL_FLOAT, false, Util::pointer_diff(&v, &v.m_uv));
+	glVertexArrayAttribIFormat(vao, 4, 1, GL_UNSIGNED_INT, Util::pointer_diff(&v, &v.m_texid));
 
-	for(int i = 0; i < 4; i++) {
+	for(int i = 0; i < 5; i++) {
 		glEnableVertexArrayAttrib(vao, i);
 		glVertexArrayAttribBinding(vao, i, 0);
 	}

src/graphics/vertex.hpp

@@ -7,13 +7,14 @@ namespace Graphics {
 	struct Vertex {
 		glm::vec4 m_pos;
 		glm::vec4 m_colour = {1, 1, 1, 1};
+		glm::vec2 m_screen_offset = {0, 0};
 		glm::vec2 m_uv;
 		unsigned int m_texid = 0;
-		int _padding_1 = 0;
+		int _padding_1[3] = {0};
 
 		static void set_vertex_attribs(unsigned int vao, unsigned int vbo);
 	};
 
-	static_assert(sizeof(Vertex) == 48);
+	static_assert(sizeof(Vertex) == 64);
 };
 

src/graphics/window.cpp

@@ -76,6 +76,7 @@ Window::Window() {
 	glEnable(GL_DEPTH_TEST);
 	glEnable(GL_CULL_FACE);
 	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 }
 
 Window::Window(Window&& o) {

src/main.cpp

@@ -9,11 +9,11 @@ int main() {
 	World::State state;
 
 	while(!pipeline.should_close()) {
-		Graphics::Context ctx(pipeline.m_window, pipeline.m_program_model);
-		ctx.set_player(state.m_player);
-
 		pipeline.update();
-		state.update(ctx);
+		state.update();
+
+		Graphics::Context ctx(pipeline.m_program_model);
+		ctx.set_from_state(state);
 		pipeline.render(state, ctx);
 	}
 }

src/world/builder.cpp

@@ -4,6 +4,8 @@
 #include "../graphics/texture.hpp"
 #include "chunk.hpp"
 #include "map.hpp"
+#include "player.hpp"
+#include "state.hpp"
 #include "tile/empty.hpp"
 #include "tile/tile_base.hpp"
 #include <GL/glew.h>
@@ -18,7 +20,7 @@ using World::Builder;
 Builder::Builder() {
 	Graphics::Mesh mesh;
 	auto prim = Chunk::PRIMITIVE_B;
-	prim.m_texid = Graphics::Texture::YELLOW_BRICK_WALL;
+	prim.m_texid = Graphics::Texture::YELLOW_BRICK_FLOOR;
 	mesh.add_primitive(prim);
 
 	for(int i = 0; i < 4; i++) {
@@ -30,17 +32,20 @@ Builder::Builder() {
 	m_model.set(mesh, GL_STATIC_DRAW);
 }
 
-void Builder::update(Map& map, const Graphics::Context& ctx) {
+void Builder::update(State& state) {
 	m_has_intersect = false;
 	if(Graphics::Window::mouse_locked) {
 		return;
 	}
 
+	Player& player = state.m_player;
+	Map& map = state.m_map;
+
 	glm::vec<2, double> mpos;
-	glfwGetCursorPos(ctx.m_window, &mpos.x, &mpos.y);
+	glfwGetCursorPos(glfwGetCurrentContext(), &mpos.x, &mpos.y);
 	mpos.y = Graphics::Window::size.y - mpos.y;
-	glm::vec<3, double> near = glm::unProject<float>(glm::vec3(mpos, -1), ctx.m_view, ctx.m_projection, glm::vec4(0, 0, Graphics::Window::size));
-	glm::vec<3, double> far = glm::unProject<float>(glm::vec3(mpos, 1), ctx.m_view, ctx.m_projection, glm::vec4(0, 0, Graphics::Window::size));
+	glm::vec<3, double> near = glm::unProject<float>(glm::vec3(mpos, -1), player.m_view, player.m_projection, glm::vec4(0, 0, Graphics::Window::size));
+	glm::vec<3, double> far = glm::unProject<float>(glm::vec3(mpos, 1), player.m_view, player.m_projection, glm::vec4(0, 0, Graphics::Window::size));
 	glm::vec<3, double> direction = far - near;
 	const glm::vec<2, double> CHECK_TILES[] = {{1, 0}, {0, 1}, {-1, 0}, {0, -1}};
 	bool found = false;
@@ -49,7 +54,7 @@ void Builder::update(Map& map, const Graphics::Context& ctx) {
 		return;
 	}
 
-	m_intersect = glm::round(glm::vec<2, double>(near - direction / direction.z * near.z) + ctx.m_transform);
+	m_intersect = glm::round(glm::vec<2, double>(near - direction / direction.z * near.z) + player.m_pos);
 	m_has_intersect = true;
 	
 	if(map.get_tile(m_intersect)) {
@@ -71,6 +76,16 @@ void Builder::update(Map& map, const Graphics::Context& ctx) {
 		tile = nullptr;
 	}
 	map.set_tile(m_intersect, std::move(tile));
+
+	state.m_particles.add({
+		.m_pos = {m_intersect, 0.75/2},
+		.m_acc = {0, 0, -0.98},
+		.m_random_pos = 0.5,
+		.m_random_vel = 0.05,
+		.m_duration = 1,
+		.m_size = 0.025,
+		.m_texid = Graphics::Texture::YELLOW_BRICK_WALL,
+	});
 }
 
 void Builder::render(const Graphics::Context& ctx) const {

src/world/builder.hpp

@@ -3,9 +3,9 @@
 
 #include "../graphics/context.hpp"
 #include "../graphics/gl/model.hpp"
-#include "map.hpp"
 
 namespace World {
+	struct State;
 	struct Builder {
 		enum Mode {
 			SET,
@@ -19,7 +19,7 @@ namespace World {
 
 		Builder();
 
-		void update(Map& map, const Graphics::Context& ctx);
+		void update(State& state);
 		void render(const Graphics::Context& ctx) const;
 	};
 };

src/world/chunk.cpp

@@ -79,7 +79,7 @@ void Chunk::update(Map& map) {
 			
 			auto prim = PRIMITIVE_B;
 			prim.m_offset = {t_off, 0, 0};
-			prim.m_texid = Graphics::Texture::MISSING;
+			prim.m_texid = Graphics::Texture::YELLOW_BRICK_FLOOR;
 			mesh.add_primitive(prim);
 
 			for(int i = 0; i < std::size(neighbours); i++) {

src/world/chunk.hpp

@@ -32,9 +32,9 @@ namespace World {
 		static const inline Graphics::Primitive<4, 6> PRIMITIVE_0 = {
 			.m_vertices={
 				{.m_pos={-0.5, -0.5, 0.75, 1}, .m_uv={0, 0}},
-				{.m_pos={-0.5, -0.5, 0,    1}, .m_uv={0, 2}},
+				{.m_pos={-0.5, -0.5, 0,    1}, .m_uv={0, 1.5}},
 				{.m_pos={+0.5, -0.5, 0.75, 1}, .m_uv={2, 0}},
-				{.m_pos={+0.5, -0.5, 0,    1}, .m_uv={2, 2}},
+				{.m_pos={+0.5, -0.5, 0,    1}, .m_uv={2, 1.5}},
 			},
 			.m_indices={
 				0, 2, 3,

src/world/map.hpp

@@ -14,6 +14,7 @@ namespace World {
 #include <memory>
 
 namespace World {
+	struct State;
 	struct Map {
 		static constexpr int N = 16;
 		std::map<uint64_t, Chunk> m_chunks;

src/world/player.cpp

@@ -1,7 +1,6 @@
 
 #include "player.hpp"
 #include "../graphics/window.hpp"
-#include "../util/math/mod.hpp"
 #include <GLFW/glfw3.h>
 #include <algorithm>
 #include <cmath>
@@ -64,13 +63,13 @@ void Player::update() {
 	m_vel += m_accel;
 	m_pos += m_vel;
 	m_accel = -m_vel * 0.125;
-}
 
-glm::mat4 Player::get_view_matrix() const {
 	glm::mat4 mat(1);
 	mat = glm::translate(mat, {0, 0, -m_distance});
 	mat = glm::rotate(mat, (float)m_yaw, {-1, 0, 0});
 	mat = glm::rotate(mat, (float)m_pitch, {0, 0, 1});
-	return mat;
+
+	m_view = mat;
+	m_projection = glm::perspective(glm::radians(90.0f), Graphics::Window::get_aspect(), 0.01f, 10.f);
 }
 

src/world/player.hpp

@@ -11,13 +11,16 @@ namespace World {
 		glm::vec<2, double> m_vel = {0.01, 0};
 		glm::vec<2, double> m_accel = {0, 0};
 		glm::vec<2, double> m_cursor_last;
+
+		glm::mat4 m_view;
+		glm::mat4 m_projection;
+
 		double m_distance = 2;
 		double m_pitch = 0;
 		double m_yaw = glm::pi<double>() * 5.0 / 16.0;
 
 		Player();
 		void update();
-		glm::mat4 get_view_matrix() const;
 	};
 };
 

src/world/state.cpp

@@ -9,14 +9,16 @@ State::State() {
 	m_map.set_tile({0, 0}, std::make_unique<Tile::Empty>());
 }
 
-void State::update(const Graphics::Context& ctx) {
-	m_builder.update(m_map, ctx);
+void State::update() {
 	m_player.update();
+	m_builder.update(*this);
 	m_map.update();
+	m_particles.update();
 }
 
 void State::render(const Graphics::Context& ctx) const {
 	m_map.render(ctx);
 	m_builder.render(ctx);
+	m_particles.render(ctx);
 }
 

src/world/state.hpp

@@ -1,20 +1,26 @@
 
 #pragma once
 
-#include "../graphics/context.hpp"
+namespace World {
+	struct State;
+};
+
+#include <glm/matrix.hpp>
+#include "../graphics/particles.hpp"
 #include "builder.hpp"
 #include "player.hpp"
 #include "map.hpp"
 
 namespace World {
 	struct State {
+		Graphics::Particles m_particles;
 		Builder m_builder;
 		Player m_player;
 		Map m_map;
 
 		State();
 
-		void update(const Graphics::Context& ctx);
+		void update();
 		void render(const Graphics::Context& ctx) const;
 	};
 };