Added Flecs, license comments and created the project outline.

config.mk

@@ -1,6 +1,8 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
 CC := cc
 CFLAGS := -Wall -Wextra -std=c99 -pedantic -ggdb -O2
-LIBS :=
+LIBS := -lm
 # if this is set to gl, it will use OpenGL, otherwise it will use Vulkan
 BACKEND := gl
 

gl/gl.c

@@ -1,6 +1,5 @@
-/**
- * SPDX-License-Identifier: (WTFPL OR CC0-1.0) AND Apache-2.0
- */
+// SPDX-License-Identifier: (WTFPL OR CC0-1.0) AND Apache-2.0
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

gl/platform.c

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
 #include "gl.h"
 #define RGFW_IMPLEMENTATION
 #define RGFW_OPENGL

linear.c

@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: BSD-3-Clause
+#include "linear.h"
+
+float vec2_dot(vec2 a, vec2 b)
+{
+    float result = 0.0f;
+    for (int i=0; i<2; i++) {
+        result += a[i] * b[i];
+    }
+
+    return result;
+}
+
+float vec3_dot(vec3 a, vec3 b)
+{
+    float result = 0.0f;
+    for (int i=0; i<3; i++) {
+        result += a[i] * b[i];
+    }
+
+    return result;
+}
+
+float vec4_dot(vec4 a, vec4 b)
+{
+    float result = 0.0f;
+    for (int i=0; i<4; i++) {
+        result += a[i] * b[i];
+    }
+
+    return result;
+}
+
+void vec3_cross(vec3 dest, vec3 a, vec3 b)
+{
+    vec3 res = {0};
+    res[0] = a[1] * b[2] - a[2] * b[1];
+    res[1] = a[2] * b[0] - a[0] * b[2];
+    res[2] = a[0] * b[1] - a[1] * b[0];
+    memcpy(dest, res, sizeof(vec3));
+}
+
+void mat4_perspective(mat4 dest, float fov, float aspect, float near, float far)
+{
+    mat4 perspective = {
+        { 1.0f/(aspect*tan(fov/2.0f)), 0.0f, 0.0f, 0.0f },
+        { 0.0f, 1.0f/tan(fov/2.0f), 0.0f, 0.0f },
+        { 0.0f, 0.0f, -((far+near)/(far-near)), -((2*far*near)/(far-near)) },
+        { 0.0f, 0.0f, -1.0f, 0.0f }
+    };
+
+    memcpy(dest, perspective, sizeof(mat4));
+}
+
+void mat4_lookat(mat4 dest, vec3 eye, vec3 target, vec3 up)
+{
+    vec3 target_cpy = {0};
+    memcpy(target_cpy, target, sizeof(vec3));
+    vec3_sub(target_cpy, target_cpy, eye);
+
+    vec3 zaxis = {0};
+    vec3_normalize(zaxis, target_cpy);
+
+    vec3 zaxis_cpy = {0};
+    memcpy(zaxis_cpy, zaxis, sizeof(vec3));
+    vec3_cross(zaxis_cpy, zaxis, up);
+
+    vec3 xaxis = {0};
+    vec3_normalize(xaxis, zaxis_cpy);
+
+    vec3 yaxis = {0};
+    vec3_cross(yaxis, xaxis, zaxis);
+
+    zaxis[0] = -zaxis[0];
+    zaxis[1] = -zaxis[1];
+    zaxis[2] = -zaxis[2];
+
+    mat4 view = {
+        { xaxis[0], xaxis[1], xaxis[2], -vec3_dot(xaxis, eye) },
+        { yaxis[0], yaxis[1], yaxis[2], -vec3_dot(yaxis, eye) },
+        { zaxis[0], zaxis[1], zaxis[2], -vec3_dot(zaxis, eye) },
+        { 0.0f, 0.0f, 0.0f, 1.0f }
+    };
+
+    memcpy(dest, view, sizeof(mat4));
+}
+
+void vec2_sub(vec2 dest, vec2 a, vec2 b)
+{
+    vec2 res = {0};
+    for (int i=0; i<2; i++) res[i] = a[i] - b[i];
+    memcpy(dest, res, sizeof(vec2));
+}
+
+void vec3_sub(vec3 dest, vec3 a, vec3 b)
+{
+    vec3 res = {0};
+    for (int i=0; i<3; i++) res[i] = a[i] - b[i];
+    memcpy(dest, res, sizeof(vec3));
+}
+
+void vec4_sub(vec4 dest, vec4 a, vec4 b)
+{
+    vec4 res = {0};
+    for (int i=0; i<4; i++) res[i] = a[i] - b[i];
+    memcpy(dest, res, sizeof(vec4));
+}
+
+void vec2_add(vec2 dest, vec2 a, vec2 b)
+{
+    vec2 res = {0};
+    for (int i=0; i<2; i++) res[i] = a[i] + b[i];
+    memcpy(dest, res, sizeof(vec2));
+}
+
+void vec3_add(vec3 dest, vec3 a, vec3 b)
+{
+    vec3 res = {0};
+    for (int i=0; i<3; i++) res[i] = a[i] + b[i];
+    memcpy(dest, res, sizeof(vec3));
+}
+
+void vec4_add(vec4 dest, vec4 a, vec4 b)
+{
+    vec4 res = {0};
+    for (int i=0; i<4; i++) res[i] = a[i] + b[i];
+    memcpy(dest, res, sizeof(vec4));
+}
+
+void vec2_normalize(vec2 dest, vec2 a)
+{
+    vec2 res = {0};
+    memcpy(res, a, sizeof(vec2));
+    float w = sqrt(a[0] * a[0] + a[1] * a[1]);
+    res[0] /= w;
+    res[1] /= w;
+    memcpy(dest, res, sizeof(vec2));
+}
+
+void vec3_normalize(vec3 dest, vec3 a)
+{
+    vec3 res = {0};
+    memcpy(res, a, sizeof(vec3));
+    float w = sqrt(a[0] * a[0] + a[1] * a[1] + a[2] * a[2]);
+    res[0] /= w;
+    res[1] /= w;
+    res[2] /= w;
+    memcpy(dest, res, sizeof(vec3));
+}
+
+void vec4_normalize(vec4 dest, vec4 a)
+{
+    vec4 res = {0};
+    memcpy(res, a, sizeof(vec4));
+    float w = sqrt(a[0] * a[0] + a[1] * a[1] + a[2] * a[2]);
+    res[0] /= w;
+    res[1] /= w;
+    res[2] /= w;
+    res[3] /= w;
+    memcpy(dest, res, sizeof(vec4));
+}
+
+void vec2_scale(vec2 dest, vec2 a, float scale)
+{
+    memcpy(dest, a, sizeof(vec2));
+    for (int i=0; i<2; i++) dest[i] *= scale;
+}
+
+void vec3_scale(vec3 dest, vec3 a, float scale)
+{
+    memcpy(dest, a, sizeof(vec3));
+    for (int i=0; i<3; i++) dest[i] *= scale;
+}
+
+void vec4_scale(vec4 dest, vec4 a, float scale)
+{
+    memcpy(dest, a, sizeof(vec4));
+    for (int i=0; i<4; i++) dest[i] *= scale;
+}

linear.h

@@ -0,0 +1,47 @@
+// SPDX-License-Identifier: BSD-3-Clause
+#ifndef LINEAR_H
+#define LINEAR_H
+
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include "types.h"
+
+#define PI 3.14159265358979323846
+#define RAD(deg) deg * (PI / 180.0f)
+#define DEG(rad) rad * (180.0f / PI)
+
+typedef f32 vec2[2];
+typedef f32 vec3[3];
+typedef f32 vec4[4];
+
+typedef f32 mat2[2][2];
+typedef f32 mat3[3][3];
+typedef f32 mat4[4][4];
+
+f32 vec2_dot(vec2 a, vec2 b);
+f32 vec3_dot(vec3 a, vec3 b);
+f32 vec4_dot(vec4 a, vec4 b);
+
+void vec2_sub(vec2 dest, vec2 a, vec2 b);
+void vec3_sub(vec3 dest, vec3 a, vec3 b);
+void vec4_sub(vec4 dest, vec4 a, vec4 b);
+
+void vec2_add(vec2 dest, vec2 a, vec2 b);
+void vec3_add(vec3 dest, vec3 a, vec3 b);
+void vec4_add(vec4 dest, vec4 a, vec4 b);
+
+void vec3_cross(vec3 dest, vec3 a, vec3 b);
+
+void vec2_normalize(vec2 dest, vec2 a);
+void vec3_normalize(vec3 dest, vec3 a);
+void vec4_normalize(vec4 dest, vec4 a);
+
+void vec2_scale(vec2 dest, vec2 a, f32 scale);
+void vec3_scale(vec3 dest, vec3 a, f32 scale);
+void vec4_scale(vec4 dest, vec4 a, f32 scale);
+
+void mat4_perspective(mat4 dest, f32 fov, f32 aspect, f32 near, f32 far);
+void mat4_lookat(mat4 dest, vec3 eye, vec3 target, vec3 up);
+
+#endif

makefile

@@ -1,6 +1,8 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
 include config.mk
 
-SRC:=topaz.c
+SRC:=topaz.c linear.c flecs.c
 
 ifeq (${BACKEND},gl)
 	SRC += gl/gl.c gl/platform.c

platform.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
 #ifndef PLATFORM_H
 #define PLATFORM_H
 

rendering/renderer.h

@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+#ifndef RENDERER_H
+#define RENDERER_H
+#include "../types.h"
+
+struct mesh {
+	usize index;
+	usize size;
+};
+
+struct mesh renderer_build_chunk_mesh();
+void renderer_draw_mesh(struct mesh);
+void renderer_draw_chunk(struct mesh);
+
+#endif

topaz.c

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
 #include <stdio.h>
 #include "platform.h"
 

types.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
 #ifndef TYPES_H
 #define TYPES_H
 
@@ -16,4 +18,7 @@ typedef int64_t i64;
 
 typedef size_t usize;
 
+typedef float f32;
+typedef double f64;
+
 #endif

utils.h

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
 #ifndef UTILS_H
 #define UTILS_H
 

world/block.h

@@ -0,0 +1,13 @@
+#ifdef BLOCK_H
+#define BLOCK_H
+
+#include "../types.h"
+
+typedef u16 block_id;
+
+#define BLOCK_AIR_ID 0
+#define BLOCK_STONE_ID 1
+#define BLOCK_DIRT_ID 1
+#define BLOCK_GRASS_ID 1
+
+#endif

world/chunk.h

@@ -0,0 +1,21 @@
+#ifndef CHUNK_H
+#define CHUNK_H
+
+#include "block.h"
+
+#define CHUNK_SIZE 16
+#define CHUNK_INDEX(x, y, z) (CHUNK_SIZE * CHUNK_SIZE * (x) + CHUNK_SIZE * (y) + (z))
+
+typedef usize chunk_position[2];
+
+/*
+ * Chunk are a group of blocks with
+ * size 16x16x16. The world is composed
+ * of infinite chunks in each axis.
+ */
+struct chunk {
+	block_id blocks[CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE];
+	chunk_position position;
+};
+
+#endif