add texture atlas for gpus without bindless textures

assets/shader/blur.fsh

@@ -1,26 +0,0 @@
-
-#version 460 core
-
-uniform sampler2D tex;
-uniform vec2 direction;
-uniform int samples;
-
-in vec2 FragPos;
-out vec4 FragColour;
-
-void main()
-{
-	int radius = (samples - 1) / 2;
-	ivec2 size = textureSize(tex, 0);
-	vec2 step = direction / size;
-	vec4 sum = vec4(0.f);
-
-	for(int i = -radius; i <= radius; i++)
-	{
-		vec2 offset = vec2(i) * step;
-		sum += texture(tex, FragPos + offset);
-	}
-
-	FragColour = sum / float(samples);
-}
-

assets/shader/post_base.vsh

@@ -1,21 +0,0 @@
-
-#version 460 core
-
-const vec2 QuadVertices[6] = vec2[6](
-	vec2(-1.0,  1.0),
-	vec2(-1.0, -1.0),
-	vec2( 1.0, -1.0),
-	vec2(-1.0,  1.0),
-	vec2( 1.0, -1.0),
-	vec2( 1.0,  1.0)
-);
-
-out vec2 FragPos;
-
-void main()
-{
-	vec2 vertex = QuadVertices[gl_VertexID];
-	FragPos = vertex * 0.5f + 0.5f;
-	gl_Position = vec4(vertex, 0.f, 1.f);
-}
-

src/graphics/data/arrays.cpp

@@ -38,18 +38,19 @@ void Arrays::vertex_attrib_pointers()
 
 	glVertexAttribPointer(5, 3, GL_FLOAT, true, sizeof(v), ptr_diff(&v.tbn[2], &v));
 	glEnableVertexAttribArray(5);
-
-	glVertexAttribIPointer(6, 1, GL_INT, sizeof(v), ptr_diff(&v.transform_id, &v));
+	
+	glVertexAttribPointer(6, 3, GL_FLOAT, false, sizeof(v), ptr_diff(&v.material, &v));
 	glEnableVertexAttribArray(6);
 
-	glVertexAttribIPointer(7, 1, GL_UNSIGNED_INT, sizeof(v), ptr_diff(&v.tex_diffuse, &v));
+	glVertexAttribIPointer(7, 1, GL_INT, sizeof(v), ptr_diff(&v.transform_id, &v));
 	glEnableVertexAttribArray(7);
 
-	glVertexAttribIPointer(8, 1, GL_UNSIGNED_INT, sizeof(v), ptr_diff(&v.tex_normal, &v));
+	glVertexAttribIPointer(8, 1, GL_UNSIGNED_INT, sizeof(v), ptr_diff(&v.tex_diffuse, &v));
 	glEnableVertexAttribArray(8);
 
-	glVertexAttribPointer(9, 3, GL_FLOAT, false, sizeof(v), ptr_diff(&v.material, &v));
+	glVertexAttribIPointer(9, 1, GL_UNSIGNED_INT, sizeof(v), ptr_diff(&v.tex_normal, &v));
 	glEnableVertexAttribArray(9);
+
 }
 
 std::ostream& Arrays::operator<<(std::ostream& os, const Vertex& v)

src/graphics/data/atlas.hpp

@@ -0,0 +1,138 @@
+
+#pragma once
+
+#include <vector>
+
+namespace Sim::Graphics::Data
+{
+
+template <int N>
+struct Atlas
+{
+	struct Pixel
+	{
+		uint8_t data[N] = {0};
+
+		constexpr Pixel() = default;
+
+		constexpr Pixel(const Pixel& p)
+		{
+			for(int i = 0; i < N; i++)
+			{
+				data[i] = p.data[i];
+			}
+		}
+
+		constexpr Pixel(const uint8_t* p)
+		{
+			for(int i = 0; i < N; i++)
+			{
+				data[i] = p[i];
+			}
+		}
+		
+		constexpr bool operator == (const Pixel& p) const
+		{
+			for(int i = 0; i < N; i++)
+			{
+				if(data[i] != p.data[i])
+				{
+					return false;
+				}
+			}
+			
+			return true;
+		}
+
+		constexpr bool operator != (const Pixel& p) const
+		{
+			return !(*this == p);
+		}
+
+		constexpr Pixel& operator = (const Pixel& p)
+		{
+			for(int i = 0; i < N; i++)
+			{
+				data[i] = p.data[i];
+			}
+
+			return *this;
+		}
+
+		constexpr Pixel& operator = (const uint8_t* p)
+		{
+			for(int i = 0; i < N; i++)
+			{
+				data[i] = p[i];
+			}
+
+			return *this;
+		}
+
+		constexpr uint8_t& operator [] (int i)
+		{
+			return data[i];
+		}
+
+		constexpr const uint8_t& operator [] (int i) const
+		{
+			return data[i];
+		}
+	};
+
+	const int width;
+	const int height;
+
+	std::vector<Pixel> data;
+
+	Atlas(int width, int height)
+		: width(width)
+		, height(height)
+		, data(width * height)
+	{
+	}
+
+	Pixel& operator()(int x, int y)
+	{
+		return data[y * width + x];
+	}
+
+	const Pixel& operator()(int x, int y) const
+	{
+		return data[y * width + x];
+	}
+
+	void draw(const Atlas<N>& src, int x, int y, bool padding = false)
+	{
+		for(int i = 0; i < src.height; i++)
+		{
+			for(int j = 0; j < src.width; j++)
+			{
+				(*this)(x + j, y + i) = src(j, i);
+			}
+		}
+
+		if(padding)
+		{
+			for(int i = 0; i < src.height; i++)
+			{
+				(*this)(x - 1, y + i) = src(0, i);
+				(*this)(x + src.width, y + i) = src(src.width - 1, i);
+			}
+
+			for(int i = 0; i < src.width; i++)
+			{
+				(*this)(x + i, y - 1) = src(i, 0);
+				(*this)(x + i, y + src.height) = src(i, src.height - 1);
+			}
+
+			(*this)(x - 1, y - 1) = src(0, 0);
+			(*this)(x + src.width, y - 1) = src(src.width - 1, 0);
+			(*this)(x - 1, y + src.height) = src(0, src.height - 1);
+			(*this)(x + src.width, y + src.height) = src(src.width - 1, src.height - 1);
+		}
+	}
+};
+
+};
+

src/graphics/data/camera.hpp

@@ -2,16 +2,18 @@
 #pragma once
 
 #include <glm/matrix.hpp>
+#include <string>
 
 namespace Sim::Graphics::Data
 {
 
 struct Camera
 {
-	glm::vec3 pos;
-	glm::vec3 look;
-	glm::vec3 up;
-	float fov;
+	const std::string name;
+	const glm::vec3 pos;
+	const glm::vec3 look;
+	const glm::vec3 up;
+	const float fov;
 
 	float pitch = 0;
 	float yaw = 0;

src/graphics/data/font.cpp

@@ -8,25 +8,27 @@
 #include <glm/vec2.hpp>
 #include <iostream>
 #include <vector>
+#include <format>
 
+#include "../shader.hpp"
 #include "mesh.hpp"
 #include "arrays.hpp"
 #include "material.hpp"
+#include "texture.hpp"
 #include "font.hpp"
 
 using namespace Sim::Graphics::Data;
 
-struct Character
+Font Fonts::BASE;
+Font Fonts::MONO;
+
+void Fonts::init()
 {
-	uint32_t handle;
-	float advance;
-	glm::vec2 size;
-	glm::vec2 bearing;
-};
+	BASE.init("DroidSans", 64);
+	MONO.init("DroidSansMono", 64);
+}
 
-static Character chars[128];
-
-void Font::init()
+void Font::init(const std::string& name, int size)
 {
 	FT_Library ft;
 	FT_Face face;
@@ -37,22 +39,15 @@ void Font::init()
 		return;
 	}
 
-	if(FT_New_Face(ft, "../assets/font/DroidSans.ttf", 0, &face))
+	if(FT_New_Face(ft, std::format("../assets/font/{}.ttf", name).c_str(), 0, &face))
 	{
 		std::cout << "Error: failed to load freetype font\n";
 		return;
 	}
 
-	int size = 256;
-	float m = 1.0f / size;
-
+	texel_size = 1.0f / size;
 	FT_Set_Pixel_Sizes(face, 0, size);
 
-	GLuint texids[128];
-	std::vector<glm::vec<4, unsigned char>> pixels;
-	
-	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-
 	for(int i = 0; i < 128; i++)
 	{
 		if(FT_Load_Char(face, (char)i, FT_LOAD_RENDER))
@@ -65,61 +60,59 @@ void Font::init()
 		int offx = face->glyph->bitmap_left;
 		int offy = face->glyph->bitmap_top;
 		
-		Character& c = chars[i];
-		c.advance = face->glyph->advance.x * m / 64.0;
-		c.size = {width * m, height * m};
-		c.bearing = {offx * m, offy * m};
+		Character& c = characters[i];
+		c.advance = face->glyph->advance.x * texel_size / 64.0;
+		c.size = {width * texel_size, height * texel_size};
+		c.bearing = {offx * texel_size, offy * texel_size};
 
 		if(c.size.x == 0 || c.size.y == 0)
 		{
-			c.handle = 0;
 			continue;
 		}
 
-		pixels.resize(width * height);
+		std::vector<uint8_t> buffer(width * height);
 
 		for(int i = 0; i < width * height; i++)
 		{
-			pixels[i] = glm::vec<4, unsigned char>(face->glyph->bitmap.buffer[i]);
+			buffer[i] = face->glyph->bitmap.buffer[i];
 		}
 
-		glCreateTextures(GL_TEXTURE_2D, 1, &texids[i]);
-
-		glTextureStorage2D(texids[i], 1, GL_RGBA8, width, height);
-		glTextureSubImage2D(texids[i], 0, 0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]);
-
-		glTextureParameteri(texids[i], GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-		glTextureParameteri(texids[i], GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-		glTextureParameteri(texids[i], GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-		glTextureParameteri(texids[i], GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-
-		c.handle = glGetTextureHandleARB(texids[i]);
-		glMakeTextureHandleResidentARB(c.handle);
-		chars[i] = c;
+		int swizzleMask[] = {GL_RED, GL_RED, GL_RED, GL_RED};
+		c.handle = Texture::load_mem(buffer.data(), width, height, 1, swizzleMask);
 	}
 
 	FT_Done_FreeType(ft);
 }
 
-Mesh& Mesh::load_text(const char* text, double size)
+Font::Font()
 {
-	std::vector<Arrays::Vertex> vertices;
-	std::vector<unsigned int> indices;
+}
+
+Mesh Font::load_text(const std::string& text, float size) const
+{
+	Mesh m;
+	
+	if(text[0] == '\0')
+	{
+		return m;
+	}
 
 	float x = 0, y = size;
 	unsigned int at = 0;
-
-	if(text[0] == '\0')
+	float t0 = 0;
+	float t1 = 1;
+/*
+	if(!Shader::USE_BINDLESS_TEXTURES)
 	{
-		this->vertices.clear();
-		this->indices.clear();
-		return *this;
-	}
+		t0 += texel_size / 2;
+		t1 -= texel_size / 2;
+	}*/
 
-	for(unsigned int i = 0; text[i] != '\0'; i++)
+
+	for(unsigned int i = 0; i < text.size(); i++)
 	{
 		char c = text[i];
-		Character ch = chars[c];
+		const Character& ch = characters[c];
 
 		if(c == '\n')
 		{
@@ -144,30 +137,25 @@ Mesh& Mesh::load_text(const char* text, double size)
 		float ex = sx + ch.size.x * size;
 		float ey = sy + ch.size.y * size;
 
-		vertices.push_back(Arrays::Vertex{.texpos={0, 0}, .pos={sx, sy, 0}, .tex_diffuse=ch.handle, .material={0, 0, 1}});
-		vertices.push_back(Arrays::Vertex{.texpos={0, 1}, .pos={sx, ey, 0}, .tex_diffuse=ch.handle, .material={0, 0, 1}});
-		vertices.push_back(Arrays::Vertex{.texpos={1, 0}, .pos={ex, sy, 0}, .tex_diffuse=ch.handle, .material={0, 0, 1}});
-		vertices.push_back(Arrays::Vertex{.texpos={1, 1}, .pos={ex, ey, 0}, .tex_diffuse=ch.handle, .material={0, 0, 1}});
-		indices.insert(indices.end(), &index[0], &index[6]);
+		m.vertices.push_back(Arrays::Vertex{.texpos={t0, t0}, .pos={sx, sy, 0}, .tex_diffuse=ch.handle, .material={0, 0, 1}});
+		m.vertices.push_back(Arrays::Vertex{.texpos={t0, t1}, .pos={sx, ey, 0}, .tex_diffuse=ch.handle, .material={0, 0, 1}});
+		m.vertices.push_back(Arrays::Vertex{.texpos={t1, t0}, .pos={ex, sy, 0}, .tex_diffuse=ch.handle, .material={0, 0, 1}});
+		m.vertices.push_back(Arrays::Vertex{.texpos={t1, t1}, .pos={ex, ey, 0}, .tex_diffuse=ch.handle, .material={0, 0, 1}});
+		m.indices.insert(m.indices.end(), &index[0], &index[6]);
 
 		at += 4;
 		x += ch.advance * size;
 	}
 
-	this->vertices = std::move(vertices);
-	this->indices = std::move(indices);
-	this->transforms.clear();
-
-	return *this;
+	return m;
 }
 
-Mesh& Mesh::load_text(const char* text, double size, glm::vec2 align)
+Mesh Font::load_text(const std::string& text, float size, glm::vec2 align) const
 {
 	glm::vec2 max;
-	
-	load_text(text, size);
+	Mesh m = load_text(text, size);
 
-	for(Arrays::Vertex& v : vertices)
+	for(Arrays::Vertex& v : m.vertices)
 	{
 		if(v.pos.x > max.x)
 		{
@@ -182,12 +170,12 @@ Mesh& Mesh::load_text(const char* text, double size, glm::vec2 align)
 
 	align *= max;
 
-	for(Arrays::Vertex& v : vertices)
+	for(Arrays::Vertex& v : m.vertices)
 	{
 		v.pos.x -= align.x;
 		v.pos.y -= align.y;
 	}
 
-	return *this;
+	return m;
 }
 

src/graphics/data/font.hpp

@@ -6,10 +6,56 @@
 #include <string>
 #include <sstream>
 
-namespace Sim::Graphics::Data::Font
+#include <glm/vec2.hpp>
+
+namespace Sim::Graphics::Data
 {
 
-void init();
+class Font
+{
+	struct Character
+	{
+		uint32_t handle;
+		glm::vec2 size;
+		glm::vec2 bearing;
+		float advance;
+	};
+
+	float texel_size;
+	Character characters[128];
+
+public:
+
+	Font();
+	
+	void init(const std::string& name, int size);
+	Mesh load_text(const std::string& text, float size, glm::vec2 align) const;
+	Mesh load_text(const std::string& text, float size) const;
+
+	template <class T>
+	void load_text(const char* header, T& item, double size)
+	{
+		std::stringstream ss;
+		ss << header << item;
+		load_text(ss.str(), size);
+	}
+	
+	template <class T>
+	void load_text(const char* header, T& item, double size, glm::vec2 align)
+	{
+		std::stringstream ss;
+		ss << header << item;
+		load_text(ss.str(), size, align);
+	}
+};
+
+namespace Fonts
+{
+	void init();
+
+	extern Font BASE;
+	extern Font MONO;
+}
 
 };
 

src/graphics/data/mesh.hpp

@@ -28,8 +28,6 @@ struct Mesh
 	Mesh& set_blank_transform();
 	Mesh& set_normal_id(unsigned int id);
 	Mesh& set_diffuse_id(unsigned int id);
-	Mesh& load_text(const char* text, double size);
-	Mesh& load_text(const char* text, double size, glm::vec2 align);
 	Mesh& add(const Mesh& o, glm::mat4 mat = glm::mat4(1), bool bake = false);
 
 	Mesh to_lines() const;
@@ -40,14 +38,6 @@ struct Mesh
 
 	bool operator==(const Mesh&) const = default;
 
-	template <class T>
-	void load_text(const char* header, T& item, double size)
-	{
-		std::stringstream ss;
-		ss << header << item;
-		load_text(ss.str().c_str(), size);
-	}
-
 	friend std::ostream& operator<<(std::ostream& os, const Mesh& m);
 };
 

src/graphics/data/model.cpp

@@ -252,7 +252,13 @@ Model::Model(std::string base, std::string filename) : base(base)
 		glm::vec3 look = glm::normalize(glm::mat3(mat) * glm::vec3(dx, dy, dz));
 		glm::vec3 up = glm::normalize(glm::mat3(mat) * glm::vec3(ux, uy, uz));
 
-		cameras.push_back({.pos=glm::vec3(pos), .look=look, .up=up, .fov=camera->mHorizontalFOV});
+		cameras.push_back(Camera {
+			.name={camera->mName.C_Str()},
+			.pos=glm::vec3(pos),
+			.look=look,
+			.up=up,
+			.fov=camera->mHorizontalFOV
+		});
 	}
 
 	for(int i = 0; i < scene->mNumMaterials; i++)

src/graphics/data/texture.cpp

@@ -2,33 +2,199 @@
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 #include <stb/stb_image.h>
+#include <stb/stb_rect_pack.h>
+
+#include <glm/matrix.hpp>
 
 #include <unordered_map>
 #include <iostream>
+#include <cmath>
 
 #include "texture.hpp"
+#include "atlas.hpp"
+#include "../shader.hpp"
 
 using namespace Sim::Graphics::Data;
 
-static std::unordered_map<std::string, uint64_t> loaded;
-uint64_t Texture::handle_white;
-uint64_t Texture::handle_normal;
+static bool is_done = false;
+static uint32_t atlas_texid;
+static uint32_t atlas_uv_ssbo;
+static std::unordered_map<std::string, uint32_t> loaded;
+static std::vector<Atlas<4>> texture_atlas_queue;
+
+uint32_t Texture::handle_white;
+uint32_t Texture::handle_normal;
 
 void Texture::init()
 {
-	unsigned char pixels_white[] = {255, 255, 255};
-	unsigned char pixels_normal[] = {128, 128, 255};
-	handle_white = load_mem(pixels_white, 1, 1, 3);
-	handle_normal = load_mem(pixels_normal, 1, 1, 3);
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+
+	unsigned char pixels_white[] = {255};
+	unsigned char pixels_normal[] = {128, 255};
+	int swizzle_white[] = {GL_RED, GL_RED, GL_RED, GL_RED};
+	int swizzle_normal[] = {GL_RED, GL_RED, GL_GREEN, GL_GREEN};
+	handle_white = load_mem(pixels_white, 1, 1, 1, swizzle_white);
+	handle_normal = load_mem(pixels_normal, 1, 1, 2, swizzle_normal);
 }
 
-uint64_t Texture::load_mem(const void* data, int width, int height, int channels)
+void Texture::generate_atlas()
 {
+	// if we are using bindless textures, we don't need to generate an atlas
+	if(Shader::USE_BINDLESS_TEXTURES)
+	{
+		return;
+	}
+
+	int total_area = 0;
+	int padding = 2;
+	int offset = 1;
+
+	for(const Atlas<4>& atlas : texture_atlas_queue)
+	{
+		total_area += (atlas.width + padding) * (atlas.height + padding);
+	}
+
+	int size = std::pow(2, std::ceil(std::log2(std::sqrt(total_area))));
+
+	std::vector<stbrp_rect> rects;
+	std::vector<glm::mat2> uvs;
+
+	rects.reserve(texture_atlas_queue.size());
+	uvs.reserve(texture_atlas_queue.size());
+
+	for(int i = 0; i < texture_atlas_queue.size(); i++)
+	{
+		const Atlas<4>& atlas = texture_atlas_queue[i];
+		stbrp_rect rect;
+		rect.id = i;
+		rect.w = atlas.width + padding;
+		rect.h = atlas.height + padding;
+		rects.push_back(rect);
+	}
+
+	stbrp_context context;
+	std::vector<stbrp_node> nodes(size);
+
+	for(;;)
+	{
+		stbrp_init_target(&context, size, size, nodes.data(), nodes.size());
+
+		if(stbrp_pack_rects(&context, rects.data(), rects.size()) == 1)
+		{
+			break;
+		}
+
+		size *= 2;
+		nodes.resize(size);
+		std::cout << "Error: failed to pack textures, trying again with size " << size << "\n";
+	}
+
+	Atlas<4> atlas(size, size);
+
+	for(const stbrp_rect& rect : rects)
+	{
+		const Atlas<4>& src = texture_atlas_queue[rect.id];
+		atlas.draw(src, rect.x + offset, rect.y + offset, true);
+
+		uvs.emplace_back(glm::mat2(
+			(rect.x + offset + 0.5f) / size, (rect.y + offset + 0.5f) / size,
+			(rect.x + offset + src.width - 0.5f) / size, (rect.y + offset + src.height - 0.5f) / size
+		));
+	}
+
+	std::cout << "Finished stitching " << size << "x" << size << " texture atlas\n";
+
+	glGenTextures(1, &atlas_texid);
+	glActiveTexture(GL_TEXTURE1);
+	glBindTexture(GL_TEXTURE_2D, atlas_texid);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, size, size, 0, GL_RGBA, GL_UNSIGNED_BYTE, atlas.data.data());
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glGenerateMipmap(GL_TEXTURE_2D);
+	glActiveTexture(GL_TEXTURE0);
+
+	glGenBuffers(1, &atlas_uv_ssbo);
+	glBindBuffer(GL_SHADER_STORAGE_BUFFER, atlas_uv_ssbo);
+	glBufferData(GL_SHADER_STORAGE_BUFFER, uvs.size() * sizeof(uvs[0]), uvs.data(), GL_STATIC_DRAW);
+	glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 5, atlas_uv_ssbo);
+	
+	glUniform1i(Shader::MAIN["tex_atlas"], 1);
+
+	is_done = true;
+}
+
+uint32_t Texture::load_mem(const uint8_t* data, int width, int height, int channels, int* swizzleMask)
+{
+	if(is_done)
+	{
+		throw std::runtime_error("Texture loading is done");
+	}
+
 	if(!data)
 	{
 		return 0;
 	}
 
+	int swizzleMaskDefault[] = {GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA};
+
+	if(!swizzleMask)
+	{
+		swizzleMask = swizzleMaskDefault;
+
+		switch(channels)
+		{
+		case 1:
+			swizzleMask[1] = GL_ONE;
+		case 2:
+			swizzleMask[2] = GL_ONE;
+		case 3:
+			swizzleMask[3] = GL_ONE;
+		}
+	}
+
+	if(!Shader::USE_BINDLESS_TEXTURES)
+	{
+		Atlas<4> atlas(width, height);
+
+		for(int i = 0; i < width * height; i++)
+		{
+			int pixel_pos = i * channels;
+			Atlas<4>::Pixel pixel;
+
+			for(int j = 0; j < 4; j++)
+			{
+				switch(swizzleMask[j])
+				{
+				case GL_RED:
+					pixel[j] = data[pixel_pos];
+					break;
+				case GL_GREEN:
+					pixel[j] = data[pixel_pos + 1];
+					break;
+				case GL_BLUE:
+					pixel[j] = data[pixel_pos + 2];
+					break;
+				case GL_ALPHA:
+					pixel[j] = data[pixel_pos + 3];
+					break;
+				case GL_ZERO:
+					pixel[j] = 0;
+					break;
+				case GL_ONE:
+					pixel[j] = 255;
+					break;
+				}
+			}
+
+			atlas.data[i] = pixel;
+		}
+		
+		texture_atlas_queue.push_back(std::move(atlas));
+		return texture_atlas_queue.size() - 1;
+	}
+
 	GLenum format;
 	GLenum format_in;
 
@@ -56,22 +222,22 @@ uint64_t Texture::load_mem(const void* data, int width, int height, int channels
 
 	unsigned int texid;
 
-	glCreateTextures(GL_TEXTURE_2D, 1, &texid);
-	glTextureStorage2D(texid, 1, format_in, width, height);
-	glTextureSubImage2D(texid, 0, 0, 0, width, height, format, GL_UNSIGNED_BYTE, data);
+	glGenTextures(1, &texid);
+	glBindTexture(GL_TEXTURE_2D, texid);
+	glTexImage2D(GL_TEXTURE_2D, 0, format_in, width, height, 0, format, GL_UNSIGNED_BYTE, data);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTextureParameteriv(texid, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask);
+	glGenerateMipmap(GL_TEXTURE_2D);
 
-	glTextureParameteri(texid, GL_TEXTURE_WRAP_S, GL_REPEAT);
-	glTextureParameteri(texid, GL_TEXTURE_WRAP_T, GL_REPEAT);
-	glTextureParameteri(texid, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-	glTextureParameteri(texid, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-	glGenerateTextureMipmap(texid);
-
-	uint64_t handle = glGetTextureHandleARB(texid);
+	uint32_t handle = glGetTextureHandleARB(texid);
 	glMakeTextureHandleResidentARB(handle);
 	return handle;
 }
 
-uint64_t Texture::load_mem(const unsigned char* filedata, size_t len)
+uint32_t Texture::load_mem(const uint8_t* filedata, size_t len)
 {
 	int width, height, channels;
 	unsigned char* data = stbi_load_from_memory(filedata, len, &width, &height, &channels, 0);
@@ -80,7 +246,7 @@ uint64_t Texture::load_mem(const unsigned char* filedata, size_t len)
 	return handle;
 }
 
-uint64_t Texture::load(std::string path)
+uint32_t Texture::load(std::string path)
 {
 	const auto it = loaded.find(path);
 

src/graphics/data/texture.hpp

@@ -4,17 +4,19 @@
 #include <GL/glew.h>
 
 #include <string>
+#include <glm/vec2.hpp>
 
 namespace Sim::Graphics::Data::Texture
 {
 
-extern uint64_t handle_white;
-extern uint64_t handle_normal;
+extern uint32_t handle_white;
+extern uint32_t handle_normal;
 
 void init();
-uint64_t load(std::string path);
-uint64_t load_mem(const void* data, int width, int height, int channels);
-uint64_t load_mem(const unsigned char* data, size_t len);
+void generate_atlas();
+uint32_t load(std::string path);
+uint32_t load_mem(const uint8_t* data, int width, int height, int channels, int* swizzleMask = nullptr);
+uint32_t load_mem(const uint8_t* data, size_t len);
 
 };
 

src/graphics/monitor/cctv.cpp

@@ -13,6 +13,7 @@
 #include "../camera.hpp"
 #include "../input/focus.hpp"
 #include "../data/texture.hpp"
+#include "../data/font.hpp"
 #include "../../system.hpp"
 #include "../../util/math.hpp"
 #include "../../util/streams.hpp"
@@ -49,7 +50,7 @@ public:
 		if(zoom)
 		{
 			Data::Camera& active = parent->cameras[parent->camera_at];
-			active.zoom = Util::Math::clamp(1.f / (1.f / active.zoom - zoom * dt * 0.5f), 1.f, 4.f);
+			active.zoom = Util::Math::clamp(active.zoom - zoom * dt * 0.5f, 0.25, 1);
 		}
 	}
 
@@ -63,7 +64,7 @@ public:
 				parent->camera_at = (parent->camera_at + parent->cameras.size() - 1) % parent->cameras.size();
 				break;
 			case GLFW_KEY_KP_2:
-				rot_pitch -= 1;
+				parent->powered = !parent->powered;
 				break;
 			case GLFW_KEY_KP_3:
 				parent->camera_at = (parent->camera_at + 1) % parent->cameras.size();
@@ -72,7 +73,7 @@ public:
 				rot_yaw += 1;
 				break;
 			case GLFW_KEY_KP_5:
-				parent->powered = !parent->powered;
+				rot_pitch -= 1;
 				break;
 			case GLFW_KEY_KP_6:
 				rot_yaw -= 1;
@@ -93,12 +94,12 @@ public:
 		{
 			switch(key)
 			{
-			case GLFW_KEY_KP_2:
-				rot_pitch += 1;
-				break;
 			case GLFW_KEY_KP_4:
 				rot_yaw -= 1;
 				break;
+			case GLFW_KEY_KP_5:
+				rot_pitch += 1;
+				break;
 			case GLFW_KEY_KP_6:
 				rot_yaw += 1;
 				break;
@@ -150,6 +151,7 @@ CCTV::CCTV(Model& model)
 	handle = glGetTextureHandleARB(texture);
 	glMakeTextureHandleResidentARB(handle);
 
+	mat = model.load_matrix("translation_monitor_1");
 	m_screen.vertices = {
 		{.texpos={0, 1}, .pos={0, 0, 0}, .transform_id=0, .tex_diffuse=handle, .material={0, 0, 1}},
 		{.texpos={0, 0}, .pos={0, 1, 0}, .transform_id=0, .tex_diffuse=handle, .material={0, 0, 1}},
@@ -157,7 +159,7 @@ CCTV::CCTV(Model& model)
 		{.texpos={1, 0}, .pos={1, 1, 0}, .transform_id=0, .tex_diffuse=handle, .material={0, 0, 1}},
 	};
 	m_screen.indices = {0, 1, 3, 0, 3, 2};
-	m_screen.transforms = {model.load_matrix("translation_monitor_1")};
+	m_screen.transforms = {mat};
 	m_screen.bake_transforms();
 
 	gm_screen.bind();
@@ -194,12 +196,50 @@ CCTV::CCTV(CCTV&& o)
 void CCTV::rotate(double dt, float pitch, float yaw)
 {
 	Data::Camera& active = cameras[camera_at];
-	float m = float(M_PI) * dt * 0.5f / active.zoom;
+	float m = float(M_PI) * dt * 0.5f * active.zoom;
 
 	active.pitch = Util::Math::clamp(active.pitch + pitch * m, -M_PI / 4, M_PI / 4);
 	active.yaw = Util::Math::clamp(active.yaw + yaw * m, -M_PI / 4, M_PI / 4);
 }
 
+void CCTV::remesh_slow(Data::Mesh& rmesh)
+{
+	if(!powered)
+	{
+		return;
+	}
+	
+	const Data::Camera& active = cameras[camera_at];
+	std::stringstream ss;
+
+	ss << "- ";
+
+	for(int i = 0; i < cameras.size(); i++)
+	{
+		if(i == camera_at)
+		{
+			ss << "[" << cameras[i].name << "] ";
+		}
+
+		else
+		{
+			ss << " " << cameras[i].name << "  ";
+		}
+	}
+
+	ss << "-\n";
+
+	rmesh.add(Data::Fonts::MONO.load_text(ss.str(), 0.02, {0.5, 0}), glm::translate(mat, {0.5, 0.95, 0}), true);
+	
+	char zoom_chars[] = "          ";
+	zoom_chars[(int)std::round(Util::Math::ramp(active.zoom, 1, 0.25, 0, 9))] = '#';
+
+	ss.str("");
+	ss << "Zoom: [" << zoom_chars << "]";
+
+	rmesh.add(Data::Fonts::MONO.load_text(ss.str(), 0.02), glm::translate(mat, {0.0125, 0.0125, 0}), true);
+}
+
 void CCTV::update(double dt)
 {
 	Data::Camera& active = cameras[camera_at];
@@ -207,21 +247,21 @@ void CCTV::update(double dt)
 	if(m_screen.check_focus())
 		Focus::set(std::make_unique<FocusCCTV>(this));
 	if(m_buttons[0].check_focus_hold())
-		active.zoom = Util::Math::clamp(1.f / (1.f / active.zoom - dt * 0.5f), 1.f, 4.f);
+		active.zoom = Util::Math::clamp(active.zoom - dt * 0.5f, 0.25, 1);
 	if(m_buttons[1].check_focus_hold())
 		rotate(dt, 1, 0);
 	if(m_buttons[2].check_focus_hold())
-		active.zoom = Util::Math::clamp(1.f / (1.f / active.zoom + dt * 0.5f), 1.f, 4.f);
+		active.zoom = Util::Math::clamp(active.zoom + dt * 0.5f, 0.25, 1);
 	if(m_buttons[3].check_focus_hold())
 		rotate(dt, 0, -1);
-	if(m_buttons[4].check_focus())
-		powered = !powered;
+	if(m_buttons[4].check_focus_hold())
+		rotate(dt, -1, 0);
 	if(m_buttons[5].check_focus_hold())
 		rotate(dt, 0, 1);
 	if(m_buttons[6].check_focus())
 		camera_at = (camera_at + cameras.size() - 1) % cameras.size();
-	if(m_buttons[7].check_focus_hold())
-		rotate(dt, -1, 0);
+	if(m_buttons[7].check_focus())
+		powered = !powered;
 	if(m_buttons[8].check_focus())
 		camera_at = (camera_at + 1) % cameras.size();
 }
@@ -239,7 +279,7 @@ void CCTV::render_view()
 	rot = glm::rotate(rot, active.pitch, right);
 
 	glm::mat4 view = glm::lookAt(active.pos, active.pos + glm::mat3(rot) * active.look, active.up);
-	glm::mat4 proj = glm::perspective(active.fov / active.zoom, (float)width / height, 0.1f, 100.0f);
+	glm::mat4 proj = glm::perspective(active.fov * active.zoom, (float)width / height, 0.1f, 100.0f);
 	glm::vec3 brightness = glm::vec3(System::active->grid.get_light_intensity());
 
 	glBindFramebuffer(GL_FRAMEBUFFER, fbo);

src/graphics/monitor/cctv.hpp

@@ -1,6 +1,8 @@
 
 #pragma once
 
+#include <glm/matrix.hpp>
+
 #include <vector>
 #include <array>
 
@@ -27,6 +29,7 @@ class CCTV : public Data::MeshGen
 
 public:
 	
+	glm::mat4 mat;
 	std::vector<Data::Camera> cameras;
 	int camera_at = 0;
 	bool powered = false;
@@ -37,6 +40,7 @@ public:
 	~CCTV();
 	
 	void update(double dt) override;
+	void remesh_slow(Data::Mesh& rmesh) override;
 	void rotate(double dt, float pitch, float yaw);
 	void render_view();
 	void render_screen();

src/graphics/monitor/core.cpp

@@ -8,6 +8,7 @@
 #include "../data/texture.hpp"
 #include "../../system.hpp"
 #include "../../util/streams.hpp"
+#include "../data/font.hpp"
 
 #include <glm/ext/matrix_transform.hpp>
 
@@ -66,7 +67,7 @@ struct CoreMonitor : public Focus::FocusType
 			sys.reactor.move_cursor(-1);
 			break;
 		case GLFW_KEY_KP_5:
-			sys.reactor.toggle_selected();
+			sys.reactor.move_cursor(sys.reactor.height);
 			break;
 		case GLFW_KEY_KP_6:
 			sys.reactor.move_cursor(1);
@@ -75,7 +76,7 @@ struct CoreMonitor : public Focus::FocusType
 			sys.reactor.reset_rod_speed();
 			break;
 		case GLFW_KEY_KP_2:
-			sys.reactor.move_cursor(sys.reactor.height);
+			sys.reactor.toggle_selected();
 			break;
 		default:
 			return;
@@ -135,9 +136,7 @@ Core::Core(const Model& model)
 
 void Core::remesh_static(Mesh& rmesh)
 {
-	Data::Mesh mesh;
-	mesh.load_text("Reactor Core", 0.04);
-	rmesh.add(mesh, mat, true);
+	rmesh.add(Data::Fonts::BASE.load_text("Reactor Core", 0.04), mat, true);
 }
 
 static Data::Mesh add_dot(glm::mat4 model_mat, glm::vec4 colour)
@@ -174,13 +173,13 @@ void Core::update(double dt)
 	if(m_buttons[3].check_focus())
 		sys.reactor.move_cursor(-1);
 	if(m_buttons[4].check_focus())
-		sys.reactor.toggle_selected();
+		sys.reactor.move_cursor(sys.reactor.height);
 	if(m_buttons[5].check_focus())
 		sys.reactor.move_cursor(1);
 	if(m_buttons[6].check_focus())
 		sys.reactor.reset_rod_speed();
 	if(m_buttons[7].check_focus())
-		sys.reactor.move_cursor(sys.reactor.height);
+		sys.reactor.toggle_selected();
 }
 
 void Core::remesh_slow(Mesh& rmesh)

src/graphics/monitor/primary_loop.cpp

@@ -7,6 +7,7 @@
 #include "../../coolant/valve.hpp"
 #include "../input/focus.hpp"
 #include "../../util/streams.hpp"
+#include "../data/font.hpp"
 
 #include <glm/ext/matrix_transform.hpp>
 #include <iostream>
@@ -67,7 +68,6 @@ PrimaryLoop::PrimaryLoop(const Model& model)
 void PrimaryLoop::remesh_static(Mesh& rmesh)
 {
 	std::stringstream ss;
-	Data::Mesh mesh;
 
 	ss << "Turbine Bypass Valve\n\n";
 	ss << "Opened\nFlow\nSetpoint\n\n";
@@ -81,8 +81,7 @@ void PrimaryLoop::remesh_static(Mesh& rmesh)
 	ss << "Pressure\n";
 	ss << "Level\n";
 
-	mesh.load_text(ss.str().c_str(), 0.04);
-	rmesh.add(mesh, mat, true);
+	rmesh.add(Data::Fonts::BASE.load_text(ss.str(), 0.04), mat, true);
 
 	rmesh.add(g_switch_pump);
 	rmesh.add(g_switch_bypass);
@@ -108,7 +107,6 @@ void PrimaryLoop::update(double dt)
 void PrimaryLoop::remesh_slow(Mesh& rmesh)
 {
 	std::stringstream ss;
-	Sim::Graphics::Data::Mesh mesh;
 	System& sys = *System::active;
 
 	ss << "\n\n";
@@ -149,7 +147,7 @@ void PrimaryLoop::remesh_slow(Mesh& rmesh)
 	show_units( ss, sys.loop.condenser.get_pressure() ) << "Pa\n";
 	ss << show( sys.loop.condenser.get_level() / 1000 ) << " / " << show( sys.loop.condenser.get_volume() / 1000 ) << " kL\n";
 
-	mesh.load_text(ss.str().c_str(), 0.04);
+	Mesh mesh = Data::Fonts::BASE.load_text(ss.str(), 0.04);
 	rmesh.add(mesh, glm::translate(mat, glm::vec3(0.5, 0, 0)));
 }
 

src/graphics/monitor/secondary_loop.cpp

@@ -7,6 +7,7 @@
 #include "../../coolant/valve.hpp"
 #include "../input/focus.hpp"
 #include "../../util/streams.hpp"
+#include "../data/font.hpp"
 
 #include <glm/ext/matrix_transform.hpp>
 #include <iostream>
@@ -42,7 +43,6 @@ void SecondaryLoop::update(double dt)
 void SecondaryLoop::remesh_static(Mesh& rmesh)
 {
 	std::stringstream ss;
-	Data::Mesh mesh;
 
 	ss << "Cooling Tower\n\n";
 	ss << "Heat\nSteam\nPressure\nLevel\n\n";
@@ -51,8 +51,7 @@ void SecondaryLoop::remesh_static(Mesh& rmesh)
 	ss << "Freight Pump\n\n";
 	ss << "Power\nSpeed\nFlow\n\n";
 
-	mesh.load_text(ss.str().c_str(), 0.04);
-	rmesh.add(mesh, mat, true);
+	rmesh.add(Data::Fonts::BASE.load_text(ss.str(), 0.04), mat, true);
 	rmesh.add(g_switch_2);
 	rmesh.add(g_switch_3);
 }
@@ -60,7 +59,6 @@ void SecondaryLoop::remesh_static(Mesh& rmesh)
 void SecondaryLoop::remesh_slow(Mesh& rmesh)
 {
 	std::stringstream ss;
-	Sim::Graphics::Data::Mesh mesh;
 	System& sys = *System::active;
 
 	ss << "\n\n";
@@ -77,7 +75,7 @@ void SecondaryLoop::remesh_slow(Mesh& rmesh)
 	ss << show( sys.freight_pump.get_rpm() ) << " r/min\n";
 	show_units( ss, sys.freight_pump.get_flow_mass() ) << "g/s\n";
 
-	mesh.load_text(ss.str().c_str(), 0.04);
+	Mesh mesh = Data::Fonts::BASE.load_text(ss.str().c_str(), 0.04);
 	rmesh.add(mesh, glm::translate(mat, glm::vec3(0.5, 0, 0)));
 }
 

src/graphics/monitor/turbine.cpp

@@ -8,6 +8,7 @@
 #include "../input/focus.hpp"
 #include "../../util/streams.hpp"
 #include "../../util/math.hpp"
+#include "../data/font.hpp"
 
 #include <glm/ext/matrix_transform.hpp>
 #include <iostream>
@@ -69,13 +70,11 @@ void Turbine::get_static_transforms(std::vector<glm::mat4>& transforms)
 void Turbine::remesh_static(Mesh& rmesh)
 {
 	std::stringstream ss;
-	Sim::Graphics::Data::Mesh mesh;
 
 	ss << "Turbine\n\n";
 	ss << "Heat\nPressure\nSpeed\n\n";
 
-	mesh.load_text(ss.str().c_str(), 0.04);
-	rmesh.add(mesh, mat, true);
+	rmesh.add(Data::Fonts::BASE.load_text(ss.str(), 0.04), mat, true);
 	
 	rmesh.add(g_dial_phase);
 	rmesh.add(g_dial_voltage);
@@ -87,7 +86,6 @@ void Turbine::remesh_static(Mesh& rmesh)
 void Turbine::remesh_slow(Mesh& rmesh)
 {
 	std::stringstream ss;
-	Sim::Graphics::Data::Mesh mesh;
 	System& sys = *System::active;
 
 	ss << "\n\n";
@@ -95,7 +93,7 @@ void Turbine::remesh_slow(Mesh& rmesh)
 	ss << show( sys.loop.turbine.get_pressure() / 1000 ) << " kPa\n";
 	ss << show( sys.loop.generator.get_rpm() ) << " r/min\n";
 	
-	mesh.load_text(ss.str().c_str(), 0.04);
+	Mesh mesh = Data::Fonts::BASE.load_text(ss.str(), 0.04);
 	rmesh.add(mesh, glm::translate(mat, glm::vec3(0.5, 0, 0)));
 }
 

src/graphics/monitor/vessel.cpp

@@ -7,6 +7,7 @@
 #include "../../reactor/control/boron_rod.hpp"
 #include "../../system.hpp"
 #include "../../util/streams.hpp"
+#include "../data/font.hpp"
 
 #include <glm/ext/matrix_transform.hpp>
 #include <sstream>
@@ -23,7 +24,6 @@ Vessel::Vessel(const Model& model)
 void Vessel::remesh_static(Mesh& rmesh)
 {
 	std::stringstream ss;
-	Sim::Graphics::Data::Mesh mesh;
 
 	ss << "Reactor Vessel\n\n";
 	ss << "Heat\n";
@@ -37,14 +37,12 @@ void Vessel::remesh_static(Mesh& rmesh)
 	ss << "Temperature\nMin\nMax\n\n";
 	ss << "Control Rods\nMin\nMax\nSpeed\n";
 
-	mesh.load_text(ss.str().c_str(), 0.04);
-	rmesh.add(mesh, mat, true);
+	rmesh.add(Data::Fonts::BASE.load_text(ss.str(), 0.04), mat, true);
 }
 
 void Vessel::remesh_slow(Mesh& rmesh)
 {
 	std::stringstream ss;
-	Sim::Graphics::Data::Mesh mesh;
 	Sim::System& sys = *System::active;
 
 	double temp_min, temp_max;
@@ -92,7 +90,7 @@ void Vessel::remesh_slow(Mesh& rmesh)
 	if(sys.reactor.rod_speed == 0) ss << " (Stopped)";
 	ss << "\n";
 
-	mesh.load_text(ss.str().c_str(), 0.04);
+	Mesh mesh = Data::Fonts::BASE.load_text(ss.str(), 0.04);
 	rmesh.add(mesh, glm::translate(mat, glm::vec3(0.5, 0, 0)));
 }
 

src/graphics/shader.cpp

@@ -8,6 +8,7 @@
 #include <format>
 
 #include "shader.hpp"
+#include "shadersource.hpp"
 #include "window.hpp"
 
 using namespace Sim::Graphics;
@@ -16,40 +17,54 @@ Shader Shader::MAIN;
 Shader Shader::LIGHT;
 Shader* Shader::ACTIVE;
 
-static std::string read_shader(const char* path)
+bool Shader::USE_BINDLESS_TEXTURES = false;
+
+static std::vector<std::string> shader_compiler_flags;
+
+void Shader::add_define(const std::string& flag)
+{
+	shader_compiler_flags.push_back(flag);
+}
+
+void Shader::init()
+{
+	Shader::Source sources_main[] = {
+		{ShaderSource::MAIN_VSH, "main.vsh", GL_VERTEX_SHADER},
+		{ShaderSource::MAIN_FSH, "main.fsh", GL_FRAGMENT_SHADER}
+	};
+
+	Shader::Source sources_light[] = {
+		{ShaderSource::LIGHT_VSH, "light.vsh", GL_VERTEX_SHADER},
+		{ShaderSource::LIGHT_GSH, "light.gsh", GL_GEOMETRY_SHADER},
+		{ShaderSource::LIGHT_FSH, "light.fsh", GL_FRAGMENT_SHADER}
+	};
+
+	Shader::MAIN.load(sources_main, "main", 2);
+	Shader::LIGHT.load(sources_light, "light", 3);
+}
+
+std::string apply_shader_compiler_flags(const char* source)
 {
 	std::stringstream ss;
-	std::ifstream file(path, std::ios::binary);
-	char buff[1024];
+	ss << "#version 430 core\n";
 
-	if(!file.is_open())
+	for(const auto& flag : shader_compiler_flags)
 	{
-		throw std::runtime_error(std::format("Shader Read Error: {0}", path));
-	}
-
-	while(!file.eof())
-	{
-		file.read(buff, 1024);
-		ss.write(buff, file.gcount());
+		ss << "#define " << flag << "\n";
 	}
 
+	ss << source;
 	return ss.str();
 }
 
-static std::string read_shader(const char* base, const char* file)
-{
-	std::string path = std::string(base) + "/" + std::string(file);
-	return read_shader(path.c_str());
-}
-
-Shader::Source::Source(const char* path, GLenum type)
+Shader::Source::Source(const char* data, const char* name, GLenum type)
 {
 	int success;
-	std::string src = read_shader(path);
-	const char* c_src = src.c_str();
+	std::string source = apply_shader_compiler_flags(data);
+	data = source.c_str();
 
 	id = glCreateShader(type);
-	glShaderSource(id, 1, &c_src, nullptr);
+	glShaderSource(id, 1, &data, nullptr);
 	glCompileShader(id);
 	glGetShaderiv(id, GL_COMPILE_STATUS, &success);
 
@@ -57,7 +72,7 @@ Shader::Source::Source(const char* path, GLenum type)
 	{
 		char infoLog[512];
 		glGetShaderInfoLog(id, 512, NULL, infoLog);
-		std::string entry = std::format("Shader Compile Error ({0}): {1}", path, infoLog);
+		std::string entry = std::format("Shader Compile Error ({0}): {1}", name, infoLog);
 		throw std::runtime_error(entry);
 	}
 }
@@ -92,7 +107,7 @@ Shader::~Shader()
 	}
 }
 
-void Shader::load(const Source* sources, int count)
+void Shader::load(const Source* sources, const char* name, int count)
 {
 	int success;
 	prog_id = glCreateProgram();
@@ -109,7 +124,7 @@ void Shader::load(const Source* sources, int count)
 	{
 		char infoLog[512];
 		glGetProgramInfoLog(prog_id, 512, NULL, infoLog);
-		std::string entry = std::format("Shader Link Error: {0}", infoLog);
+		std::string entry = std::format("Shader Link Error {0}: {1}", name, infoLog);
 		throw std::runtime_error(entry);
 	}
 }

src/graphics/shader.hpp

@@ -4,6 +4,7 @@
 #include <GL/glew.h>
 
 #include <unordered_map>
+#include <string>
 
 namespace Sim::Graphics
 {
@@ -22,7 +23,7 @@ public:
 	{
 		unsigned int id;
 
-		Source(const char* path, GLenum type);
+		Source(const char* data, const char* name, GLenum type);
 		Source(const Source& o) = delete;
 		Source(Source&& o);
 		~Source();
@@ -33,12 +34,17 @@ public:
 
 	static Shader* ACTIVE;
 
+	static bool USE_BINDLESS_TEXTURES;
+
 	Shader();
 	Shader(const Shader& o) = delete;
 	Shader(Shader&& o);
 	~Shader();
 
-	void load(const Source* sources, int count);
+	static void add_define(const std::string& flag);
+	static void init();
+
+	void load(const Source* sources, const char* name, int count);
 	void block_binding(const char* name, unsigned int index);
 	void use();
 

src/graphics/shaders/light.fsh

@@ -1,5 +1,4 @@
-
-#version 460 core
+R"GLSL(
 
 in vec3 frag_pos;
 
@@ -11,3 +10,4 @@ void main()
 	gl_FragDepth = distance / far_plane;
 }
 
+)GLSL";

src/graphics/shaders/light.gsh

@@ -1,5 +1,4 @@
-
-#version 460 core
+R"GLSL(
 
 layout (triangles) in;
 layout (triangle_strip, max_vertices=18) out;
@@ -33,3 +32,4 @@ void main()
 	}
 }
 
+)GLSL";

src/graphics/shaders/light.vsh

@@ -1,11 +1,8 @@
-
-#version 460 core
-
-#define MAX_LIGHTS 6
+R"GLSL(
 
 layout (location = 1) in vec3 aPos;
 layout (location = 2) in vec4 aColour;
-layout (location = 6) in int aTransformIndex;
+layout (location = 7) in int aTransformIndex;
 
 layout (binding = 3) readonly buffer TransformBuffer
 {
@@ -31,3 +28,4 @@ void main()
 	should_ignore = int(aColour.a < 1.f);
 }
 
+)GLSL";

src/graphics/shaders/main.fsh

@@ -1,6 +1,8 @@
+R"GLSL(
 
-#version 460 core
+#ifdef USE_BINDLESS_TEXTURES
 #extension GL_ARB_bindless_texture : require
+#endif
 
 const float PI = 3.141592f;
 
@@ -23,9 +25,40 @@ layout(std140, binding = 2) readonly buffer LightBuffer
 	Light lights[];
 };
 
+#ifdef USE_BINDLESS_TEXTURES
+
 in flat sampler2D frag_tex_diffuse;
 in flat sampler2D frag_tex_normal;
 
+#define ReadTexture(tex, uv) texture(tex, uv)
+
+#else
+
+in flat uint frag_tex_diffuse;
+in flat uint frag_tex_normal;
+
+uniform sampler2D tex_atlas;
+
+struct AtlasPart
+{
+	vec2 uv_min;
+	vec2 uv_max;
+};
+
+layout(std140, binding = 5) readonly buffer AtlasBuffer
+{
+	AtlasPart atlas[];
+};
+
+vec4 ReadTexture(uint tex, vec2 uv)
+{
+	AtlasPart a = atlas[tex];
+	uv = mod(uv, 1.f) * (a.uv_max - a.uv_min) + a.uv_min;
+	return texture(tex_atlas, uv);
+}
+
+#endif
+
 out vec4 frag_colour;
 
 uniform vec3 brightness;
@@ -107,10 +140,10 @@ vec3 sRGB_To_LinRGB(vec3 c)
 
 void main()
 {
-	vec4 albedo = texture2D(frag_tex_diffuse, vin.tex_pos);
+	vec4 albedo = ReadTexture(frag_tex_diffuse, vin.tex_pos);
 	if(albedo.a == 0.f) discard;
 
-	vec3 tangent = texture2D(frag_tex_normal, vin.tex_pos).rgb * 2.f - 1.f;
+	vec3 tangent = ReadTexture(frag_tex_normal, vin.tex_pos).rgb * 2.f - 1.f;
 	vec3 albedo_lin = sRGB_To_LinRGB(albedo.rgb) * vin.colour.rgb;
 	albedo *= vin.colour;
 
@@ -180,3 +213,4 @@ void main()
 	frag_colour = vec4(light, albedo.a);
 }
 
+)GLSL";

src/graphics/shaders/main.vsh

@@ -1,6 +1,8 @@
+R"GLSL(
 
-#version 460 core
+#ifdef USE_BINDLESS_TEXTURES
 #extension GL_ARB_bindless_texture : require
+#endif
 
 layout (location = 0) in vec2 aTexPos;
 layout (location = 1) in vec3 aPos;
@@ -8,10 +10,26 @@ layout (location = 2) in vec4 aColour;
 layout (location = 3) in vec3 aTangent;
 layout (location = 4) in vec3 aBitangent;
 layout (location = 5) in vec3 aNormal;
-layout (location = 6) in int aTransformIndex;
-layout (location = 7) in sampler2D aTexDiffuse;
-layout (location = 8) in sampler2D aTexNormal;
-layout (location = 9) in vec3 aMaterial;
+layout (location = 6) in vec3 aMaterial;
+layout (location = 7) in int aTransformIndex;
+
+#ifdef USE_BINDLESS_TEXTURES
+
+layout (location = 8) in sampler2D aTexDiffuse;
+layout (location = 9) in sampler2D aTexNormal;
+
+out flat sampler2D frag_tex_diffuse;
+out flat sampler2D frag_tex_normal;
+
+#else
+
+layout (location = 8) in uint aTexDiffuse;
+layout (location = 9) in uint aTexNormal;
+
+out flat uint frag_tex_diffuse;
+out flat uint frag_tex_normal;
+
+#endif
 
 uniform mat4 camera;
 uniform mat4 projection;
@@ -29,9 +47,6 @@ out VS_OUT {
 	flat vec3 material;
 } vout;
 
-out flat sampler2D frag_tex_diffuse;
-out flat sampler2D frag_tex_normal;
-
 mat4 load_model_mat(int index)
 {
 	return index < 0 ? mat4(1.f) : transforms[index];
@@ -60,3 +75,4 @@ void main()
 	gl_Position = mvp * pos;
 }
 
+)GLSL";

src/graphics/shadersource.cpp

@@ -0,0 +1,17 @@
+
+#include "shadersource.hpp"
+
+using namespace Sim::Graphics;
+
+const char* ShaderSource::LIGHT_VSH =
+#include "shaders/light.vsh"
+const char* ShaderSource::LIGHT_GSH =
+#include "shaders/light.gsh"
+const char* ShaderSource::LIGHT_FSH =
+#include "shaders/light.fsh"
+
+const char* ShaderSource::MAIN_VSH =
+#include "shaders/main.vsh"
+const char* ShaderSource::MAIN_FSH =
+#include "shaders/main.fsh"
+

src/graphics/shadersource.hpp

@@ -0,0 +1,12 @@
+
+#pragma once
+
+namespace Sim::Graphics::ShaderSource
+{
+	extern const char* LIGHT_VSH;
+	extern const char* LIGHT_GSH;
+	extern const char* LIGHT_FSH;
+	extern const char* MAIN_VSH;
+	extern const char* MAIN_FSH;
+};
+

src/graphics/widget/clock.cpp

@@ -27,7 +27,6 @@ void Clock::update(double dt)
 
 void Clock::remesh_slow(Mesh& rmesh)
 {
-	Mesh m;
 	double at = System::active->clock;
 	glm::vec2 wsize(Resize::get_size() / 2);
 	std::stringstream ss;
@@ -42,7 +41,7 @@ void Clock::remesh_slow(Mesh& rmesh)
 	ss << std::setfill('0') << std::setw(2) << t_s << "\n";
 	ss << "Day: " << std::floor(at / (3600 * 24)) << "\n";
 
-	m.load_text(ss.str().c_str(), 20);
+	Mesh m = Fonts::BASE.load_text(ss.str(), 20);
 	rmesh.add(m, glm::translate(glm::mat4(1), glm::vec3(-wsize + glm::vec2(2, 2), 0)));
 }
 

src/graphics/window.cpp

@@ -105,7 +105,7 @@ void Window::create()
 {
 	glfwInit();
 	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
-	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
 	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 	glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, true);
 	glfwWindowHint(GLFW_VISIBLE, false);
@@ -129,17 +129,15 @@ void Window::create()
 		return;
 	}
 
-	if(!glGetTextureHandleARB || !glMakeTextureHandleResidentARB)
+	if(glGetTextureHandleARB && glMakeTextureHandleResidentARB)
 	{
-		std::cerr << "Fatal: Bindless textures not supported\n";
+		Shader::add_define("USE_BINDLESS_TEXTURES");
+		Shader::USE_BINDLESS_TEXTURES = true;
+	}
 
-		if(!glGetTextureHandleARB)
-			std::cerr << "  Missing: glGetTextureHandleARB\n";
-		if(!glMakeTextureHandleResidentARB)
-			std::cerr << "  Missing: glMakeTextureHandleResidentARB\n";
-
-		close();
-		return;
+	else
+	{
+		std::cout << "Warning: Bindless textures are not supported. Using texture atlas instead.\n";
 	}
 
 	glEnable(GL_MULTISAMPLE);
@@ -156,21 +154,9 @@ void Window::create()
 	Mouse::init();
 	Resize::init();
 	Texture::init();
-	Font::init();
+	Fonts::init();
 	UI::init();
-
-	// load all the shaders
-	Shader::Source sources_main[] = {
-		{"../assets/shader/main.vsh", GL_VERTEX_SHADER},
-		{"../assets/shader/main.fsh", GL_FRAGMENT_SHADER},
-	};
-	Shader::Source sources_light[] = {
-		{"../assets/shader/light.vsh", GL_VERTEX_SHADER},
-		{"../assets/shader/light.gsh", GL_GEOMETRY_SHADER},
-		{"../assets/shader/light.fsh", GL_FRAGMENT_SHADER},
-	};
-	Shader::MAIN.load(sources_main, 2);
-	Shader::LIGHT.load(sources_light, 3);
+	Shader::init();
 
 	Shader::MAIN.use();
 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
@@ -204,6 +190,8 @@ void Window::create()
 	equipment.push_back(new Equipment::Generator(model));
 	equipment.push_back(new Equipment::Pool(model));
 
+	Texture::generate_atlas();
+	
 	remesh_static();
 
 	glfwShowWindow(win);

src/stb/stb_rect_pack.cpp

@@ -0,0 +1,4 @@
+
+#define STB_RECT_PACK_IMPLEMENTATION
+#include <stb/stb_rect_pack.h>
+

src/util/math.hpp

@@ -48,5 +48,11 @@ constexpr A mod(A a, auto b)
 	return v;
 }
 
+template <typename A>
+constexpr A ramp(A v, auto imin, auto imax, auto omin, auto omax)
+{
+	return clamp(map(v, imin, imax, omin, omax), omin, omax);
+}
+
 };