get working on linux (kinda), implement hash table

compile_commands.json

@@ -0,0 +1,18 @@
+[
+  {
+    "arguments": [
+      "/nix/store/qhpw32pz39y6i30b3vrbw5fw6zv5549f-gcc-wrapper-13.2.0/bin/cc",
+      "-c",
+      "-Ivendor/",
+      "-g",
+      "-Wall",
+      "-Wextra",
+      "-o",
+      "bin/an_editor.o",
+      "src/main.c"
+    ],
+    "directory": "/home/patrick/Documents/an_editor",
+    "file": "/home/patrick/Documents/an_editor/src/main.c",
+    "output": "/home/patrick/Documents/an_editor/bin/an_editor.o"
+  }
+]

flake.nix

@@ -14,14 +14,21 @@
         };
         naga-cli = pkgs.rustPlatform.buildRustPackage rec {
           pname = "naga-cli";
-          version = "0.19.0";
+          version = "v0.19.0";
 
-          src = pkgs.fetchCrate {
-            inherit pname version;
-            hash = "sha256-zR7Al5aMG8VTdjZwaZtjeDFI6WFD0N6MCrrLP/9PeZ8=";
+          src = pkgs.fetchFromGitHub {
+            name = "wgpu";
+            owner = "gfx-rs";
+            repo = "wgpu";
+            rev = "a63bec8cd67b4abe3b9717e1926a94d1035b830a"; # trunk as of 2024-03-15
+            hash = "sha256-AzsR24NAVYgrC/kWGXiWxyMERiLJ/Jink21P4oh8lOw=";
           };
+          buildAndTestSubdir = "naga-cli";
 
-          cargoHash = "sha256-/5srWh4CjD8S/hRFRTJE//X6TgIfbwnMKmgRMjX3084=";
+          cargoLock = {
+            lockFile = "${src}/Cargo.lock";
+            allowBuiltinFetchGit = true;
+          };
         };
       in
       {
@@ -30,13 +37,31 @@
             pkg-config
             binutils
             clang
+            bear
             naga-cli
             darwin.apple_sdk.frameworks.Kernel
             darwin.apple_sdk.frameworks.CoreVideo
             darwin.apple_sdk.frameworks.Metal
             darwin.apple_sdk.frameworks.MetalKit
             darwin.apple_sdk.frameworks.Cocoa
-          ]  else throw "unsupported system" );
+          ] else if pkgs.system == "x86_64-linux" then [
+            pkg-config
+            binutils
+            clang
+            bear
+            naga-cli
+            libGL
+            mesa
+            gf
+            xorg.libX11
+            xorg.libXi
+            xorg.xinput
+            xorg.libXcursor
+            xorg.libXrandr
+            xorg.libXinerama
+            pkgs.nixgl.nixGLIntel
+          ] 
+          else throw "unsupported system" );
         };
       }
     );

justfile

@@ -3,13 +3,14 @@ alias r := run
 
 build: transpile_shaders_metal
     mkdir -p bin
-    cc -Ivendor/ -g -Wall -Wextra -framework Cocoa -framework QuartzCore -framework CoreImage -framework Metal -framework MetalKit -ObjC src/*.c -o bin/an_editor
+    # cc -Ivendor/ -g -Wall -Wextra -framework Cocoa -framework QuartzCore -framework CoreImage -framework Metal -framework MetalKit -ObjC src/*.c -o bin/an_editor
+    cc -Ivendor/ -g -Wall -Wextra src/*.c -o bin/an_editor -lEGL -lGLESv2 -lGL -lm -lX11 -lXi -lXcursor
+    # cc bin/*.o -o bin/an_editor -lEGL -lGLESv2 -lGL -lm -lX11 -lXi -lXcursor
 
 run: build
-    ./bin/an_editor
+    nixGLIntel ./bin/an_editor
 
 transpile_shaders_metal:
     mkdir -p bin/transpiled_shaders
-    ../wgpu/target/debug/naga shaders/vertex.wgsl bin/transpiled_shaders/vertex.metal --metal-version 1.2
-    ../wgpu/target/debug/naga shaders/fragment.wgsl bin/transpiled_shaders/fragment.metal --metal-version 1.2
-    
+    naga shaders/vertex.wgsl bin/transpiled_shaders/vertex.metal --metal-version 1.2
+    naga shaders/fragment.wgsl bin/transpiled_shaders/fragment.metal --metal-version 1.2

shaders/fragment.frag

@@ -0,0 +1,21 @@
+#version 330 core
+struct VertexOutput {
+    vec4 position;
+    vec2 tex_coord;
+};
+uniform sampler2D _group_0_binding_0_fs;
+
+smooth in vec2 _vs2fs_location0;
+layout(location = 0) out vec4 _fs2p_location0;
+
+void main() {
+    VertexOutput input_ = VertexOutput(gl_FragCoord, _vs2fs_location0);
+    float text_color = 0.0;
+    vec4 _e8 = texture(_group_0_binding_0_fs, vec2(vec2(input_.tex_coord.x, input_.tex_coord.y)));
+    text_color = _e8.x;
+    float _e11 = text_color;
+    float _e17 = text_color;
+    _fs2p_location0 = vec4((_e11 * vec3(1.0, 1.0, 1.0)), _e17);
+    return;
+}
+

shaders/vertex.vert

@@ -0,0 +1,49 @@
+#version 330 core
+uniform uint naga_vs_first_instance;
+
+struct VertexInput {
+    vec3 position;
+    vec2 tex_coord;
+    vec2 atlas_position;
+    vec2 size;
+    vec2 target_position;
+    float y_offset;
+    uint glyph_id;
+};
+struct VertexOutput {
+    vec4 position;
+    vec2 tex_coord;
+};
+uniform vec4 screen_size;
+
+layout(location = 0) in vec3 _p2vs_location0;
+layout(location = 1) in vec2 _p2vs_location1;
+layout(location = 2) in vec2 _p2vs_location2;
+layout(location = 3) in vec2 _p2vs_location3;
+layout(location = 4) in vec2 _p2vs_location4;
+layout(location = 5) in float _p2vs_location5;
+smooth out vec2 _vs2fs_location0;
+
+vec4 to_device_position(vec2 position, vec2 size) {
+    return vec4((((position / size) * 2.0) - vec2(1.0)), 1.0, 1.0);
+}
+
+void main() {
+    VertexInput input_ = VertexInput(_p2vs_location0, _p2vs_location1, _p2vs_location2, _p2vs_location3, _p2vs_location4, _p2vs_location5, (uint(gl_InstanceID) + naga_vs_first_instance));
+    VertexOutput out_ = VertexOutput(vec4(0.0), vec2(0.0));
+    vec4 vertex_pos = vec4(0.0);
+    vec2 atlas_position = vec2(0.0);
+    vec4 _e28 = to_device_position((((((input_.position.xy + vec2(1.0)) / vec2(2.0)) * (input_.size / vec2(2.0))) + input_.target_position) + vec2(0.0, ((input_.y_offset / 2.0) + 32.0))), screen_size.xy);
+    vertex_pos = _e28;
+    atlas_position = (((((input_.position.xy + vec2(1.0)) / vec2(2.0)) * input_.size) + input_.atlas_position) / vec2(1024.0));
+    vec4 _e47 = vertex_pos;
+    out_.position = _e47;
+    vec2 _e49 = atlas_position;
+    out_.tex_coord = _e49;
+    VertexOutput _e50 = out_;
+    gl_Position = _e50.position;
+    _vs2fs_location0 = _e50.tex_coord;
+    gl_Position.yz = vec2(-gl_Position.y, gl_Position.z * 2.0 - gl_Position.w);
+    return;
+}
+

shaders/vertex.wgsl

@@ -15,23 +15,23 @@ struct VertexOutput {
     @location(0) tex_coord: vec2<f32>,
 }
 
-struct Params {
-    screen_size: vec2<f32>,
-}
+// struct Params {
+//     screen_size: vec4<f32>,
+// }
 
 fn to_device_position(position: vec2<f32>, size: vec2<f32>) -> vec4<f32> {
     return vec4<f32>((((position / size) * 2.) - 1.), 1., 1.);
 }
 
-@group(0) @binding(1)
-var<uniform> params: Params;
+@group(0) @binding(0)
+var<uniform> screen_size: vec4<f32>;
 
 @vertex
 fn vs_main(input: VertexInput) -> VertexOutput {
     var out: VertexOutput;
 
-    var vertex_pos = to_device_position(((input.position.xy + 1.) / 2.) * (input.size/2.0) + input.target_position + vec2<f32>(0., (input.y_offset/2.0)+32), params.screen_size);
-    vertex_pos.y = -vertex_pos.y;
+    var vertex_pos = to_device_position(((input.position.xy + 1.) / 2.) * (input.size/2.0) + input.target_position + vec2<f32>(0., (input.y_offset/2.0)+32), screen_size.xy);
+    // vertex_pos.y = -vertex_pos.y;
     var atlas_position = (((input.position.xy + 1.) / 2.) * input.size + input.atlas_position) / vec2<f32>(1024);
 
     out.position = vertex_pos;

src/compile_flags.txt

@@ -1,2 +1,5 @@
+-DED_UI_IMPLEMENTATION
+-DED_HT_IMPLEMENTATION
+-DED_STRING_IMPLEMENTATION
 -I../vendor/
 -ObjC

src/ht.h

@@ -2,21 +2,108 @@
 
 #ifndef ED_HT_INCLUDED
 #define ED_HT_INCLUDED
+
+#include <stdlib.h>
 #include <stddef.h>
+#include <stdbool.h>
 #include <stdint.h>
+#include <string.h>
+
 #include "string.h"
 
 // see <https://en.wikipedia.org/wiki/Fowler–Noll–Vo_hash_function>
-#define FNV_OFFSET 14695981039346656037UL
-#define FNV_PRIME 1099511628211UL
+#define FNV_OFFSET 14695981039346656037ULL
+#define FNV_PRIME 1099511628211ULL
 
 typedef struct {
-    
+    string key;
 } ed_ht_slot;
 
 typedef struct {
-    ed_ht_slot *slots;
+    ed_ht_slot *key_slots;
+    void *value_slots;
+    size_t value_size;
     size_t capacity;
 } ed_ht;
 
+typedef uint64_t ht_hash_t;
+
+#ifdef ED_HT_IMPLEMENTATION
+
+static ht_hash_t ht_hash(string key, uint64_t mod) {
+    ht_hash_t hash = FNV_OFFSET;
+
+    for (size_t i=0; i<key.len; ++i) {
+        hash *= FNV_PRIME;
+        hash ^= key.data[i];
+    }
+
+    return hash % mod;
+}
+
+ed_ht ht_create(size_t max_entries, size_t value_size) {
+    ed_ht_slot *key_slots = (ed_ht_slot *)malloc(max_entries * sizeof(ed_ht_slot));
+    void *value_slots = malloc(max_entries * value_size);
+
+    memset(key_slots, 0, max_entries * sizeof(ed_ht_slot));
+    memset(value_slots, 0, max_entries * value_size);
+
+    return (ed_ht) {
+        .key_slots = key_slots,
+        .value_slots = value_slots,
+        .value_size = value_size,
+        .capacity = max_entries,
+    };
+}
+
+bool ht_set(ed_ht *ht, string key, void *value) {
+    ht_hash_t hash = ht_hash(key, ht->capacity);
+
+    for (size_t i=hash; i<ht->capacity; ++i) {
+        if (ht->key_slots[i].key.data == NULL || string_eq(ht->key_slots[i].key, key)) {
+            ht->key_slots[i].key = key;
+
+            memcpy(ht->value_slots+i*ht->value_size, value, ht->value_size);
+            return true;
+        }
+    }
+
+    return false;
+}
+
+void *ht_get_slot(ed_ht *ht, size_t slot) {
+    void *value = ht->value_slots+slot*ht->value_size;
+
+    if (slot >= ht->capacity || !value)
+        return NULL;
+
+    return value;
+}
+
+void *ht_get(ed_ht *ht, string key) {
+    ht_hash_t hash = ht_hash(key, ht->capacity);
+
+    for (size_t i=hash; i<ht->capacity; ++i) {
+        if (ht->key_slots[i].key.data == NULL) {
+            return NULL;
+        }
+
+        if (string_eq(ht->key_slots[i].key, key)) {
+            return ht_get_slot(ht, i);
+        }
+    }
+
+    return NULL;
+}
+
+void ht_destroy(ed_ht *ht) {
+    // TODO: destroy the hash table
+    free(ht->key_slots);
+    free(ht->value_slots);
+
+    ht->key_slots = NULL;
+    ht->value_slots = NULL;
+}
+
+#endif
 #endif

src/main.c

@@ -1,6 +1,10 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <inttypes.h>
 
+// #define ARENA_IMPLEMENTATION
+// #include <tsoding/arena.h>
+
 #define SOKOL_DEBUG
 
 #define SOKOL_APP_IMPL
@@ -8,7 +12,11 @@
 #define SOKOL_GLUE_IMPL
 #define SOKOL_FETCH_IMPL
 #define SOKOL_LOG_IMPL
-#define SOKOL_METAL
+
+// TODO: condition compilation
+// #define SOKOL_METAL
+#define SOKOL_GLCORE33
+
 #include <sokol/sokol_log.h>
 #include <sokol/sokol_gfx.h>
 #include <sokol/sokol_app.h>
@@ -18,21 +26,22 @@
 #define STB_TRUETYPE_IMPLEMENTATION
 #include <stb/std_truetype.h>
 
-#define ARENA_IMPLEMENTATION
-#include <tsoding/arena.h>
-
-#include "string.h"
-
+#define ED_STRING_IMPLEMENTATION
+#define ED_HT_IMPLEMENTATION
 #define ED_UI_IMPLEMENTATION
+#include "string.h"
+#include "ht.h"
 #include "ui.h"
 
-static Arena default_arena = {0};
-static Arena temporary_arena = {0};
-static Arena *context_arena = &default_arena;
+
+// static Arena default_arena = {0};
+// static Arena temporary_arena = {0};
+// static Arena *context_arena = &default_arena;
 
 void *context_alloc(size_t size) {
     // assert(context_arena);
-    return arena_alloc(context_arena, size);
+    // return arena_alloc(context_arena, size);
+    return malloc(size);
 }
 
 typedef struct {
@@ -49,7 +58,7 @@ typedef struct {
 } GpuGlyph;
 
 typedef struct {
-    float screen_size[2];
+    float screen_size[4];
 } GpuUniformParams;
 
 typedef struct {
@@ -94,35 +103,35 @@ static struct {
     U8Array glyph_cache;
 
     bool should_exit;
+
+    ui_context ui_cx;
 } state;
 
 void queue_text(string text, float position[2]) {
     float x = 0;
     for (size_t i=0; i < text.len; ++i) {
-        if (text.data[i] >= 32 && text.data[i] <= 32+95) {
+        if (text.data[i] >= 32) {
             GpuGlyph glyph = *((GpuGlyph *)(state.glyph_cache.data+((text.data[i] - 32) * sizeof(GpuGlyph))));
 
             glyph.position[0] = x+position[0];
             glyph.position[1] = position[1];
             x += glyph.size[0]/2;
 
-            push_u8array(&state.gpu_glyphs, &glyph, sizeof(GpuGlyph));
+            push_u8array(&state.gpu_glyphs, (uint8_t *)(&glyph), sizeof(GpuGlyph));
         }
     }
 }
 
 void vertex_shader_loaded(const sfetch_response_t *response) {
     if (response->fetched) {
-        state.scratch_shader_desc.vs.source = response->data.ptr;
-        state.scratch_shader_desc.vs.entry = "vs_main";
         state.scratch_shader_desc.vs = (sg_shader_stage_desc) {
             .source = response->data.ptr,
             .entry = "vs_main",
             .uniform_blocks[0] = {
                 .size = sizeof(GpuUniformParams),
-                .layout = SG_UNIFORMLAYOUT_NATIVE,
+                .layout = SG_UNIFORMLAYOUT_STD140,
                 .uniforms = {
-                    [0] = { .name = "screen_size", .type = SG_UNIFORMTYPE_FLOAT2 },
+                    [0] = { .name = "screen_size", .type = SG_UNIFORMTYPE_FLOAT4 },
                 },
             },
         };
@@ -139,7 +148,7 @@ void fragment_shader_loaded(const sfetch_response_t *response) {
             .entry = "fs_main",
             .images[0].used = true,
             .samplers[0].used = true,
-            .image_sampler_pairs[0] = { .used = true, .image_slot = 0, .sampler_slot = 0 },
+            .image_sampler_pairs[0] = { .glsl_name = "_group_0_binding_0_fs", .used = true, .image_slot = 0, .sampler_slot = 0 },
         };
         state.scratch_shader_desc.fs.source = response->data.ptr;
         state.scratch_shader_desc.fs.entry = "fs_main";
@@ -151,11 +160,12 @@ void fragment_shader_loaded(const sfetch_response_t *response) {
 
 void ed_init() {
     uint8_t ttf_buffer[1<<20];
-    FILE *ttf_file = fopen("../c_editor/JetBrainsMono-Medium.ttf", "rb");
+    // TODO: grab default font from the system
+    FILE *ttf_file = fopen("./bin/JetBrainsMono-Medium.ttf", "rb");
     if (!ttf_file) {
         exit(1);
     }
-    fread(ttf_buffer, 1, 1<<20, ttf_file);
+    assert(fread(ttf_buffer, 1, 1<<20, ttf_file));
     fclose(ttf_file);
 
     stbtt_fontinfo font;
@@ -163,10 +173,11 @@ void ed_init() {
 
     sg_setup(&(sg_desc) {
         .environment = sglue_environment(),
+        .logger.func = slog_func,
     });
 
     float vertices[] = {
-        // positions            colors
+        // positions            texture coords
         -1.0f,  1.0f, 1.0f,     0.0f, 0.0f,
          1.0f,  1.0f, 1.0f,     1.0f, 0.0f,
          1.0f, -1.0f, 1.0f,     1.0f, 1.0f,
@@ -188,12 +199,24 @@ void ed_init() {
     char fs_source[8000] = { 0 };
 
     sfetch_handle_t vs_handle = sfetch_send(&(sfetch_request_t) {
+#if defined (__APPLE__)
         .path = "./bin/transpiled_shaders/vertex.metal",
+#elif defined (__linux__) || defined (__unix__)
+        .path = "./shaders/vertex.vert",
+#else
+#error "Unsupported platform for shaders"
+#endif
         .callback = vertex_shader_loaded,
         .buffer = { .ptr = vs_source, .size = sizeof(vs_source) },
     });
     sfetch_handle_t fs_handle = sfetch_send(&(sfetch_request_t) {
+#if defined (__APPLE__)
         .path = "./bin/transpiled_shaders/fragment.metal",
+#elif defined (__linux__) || defined (__unix__)
+        .path = "./shaders/fragment.frag",
+#else
+#error "Unsupported platform for shaders"
+#endif
         .callback = fragment_shader_loaded,
         .buffer = { .ptr = fs_source, .size = sizeof(fs_source) },
     });
@@ -221,12 +244,12 @@ void ed_init() {
         }
     }
     // manually add glyph for SPACE
-    push_u8array(&state.glyph_cache, &(GpuGlyph){
+    push_u8array(&state.glyph_cache, (uint8_t *)(&(GpuGlyph){
         .atlas_position = { 0 },
         .size = { rasterized_font_height/4, rasterized_font_height },
         .position = { 0 },
         .y_offset = -rasterized_font_height,
-    }, 1 * sizeof(GpuGlyph));
+    }), 1 * sizeof(GpuGlyph));
 
     int x = rasterized_font_height/4;
     int y = 0;
@@ -239,10 +262,10 @@ void ed_init() {
             y += (int)((float)(ascent - descent + line_gap)*scale);
         }
 
-        int xxx = x;
-        for (size_t xx=0; xx < width; ++xx) {
-            int yyy = y;
-            for (size_t yy=0; yy < height; ++yy) {
+        size_t xxx = x;
+        for (size_t xx=0; xx < (size_t)width; ++xx) {
+            size_t yyy = y;
+            for (size_t yy=0; yy < (size_t)height; ++yy) {
                 font_bitmap[xxx + yyy * font_bitmap_size] = bitmap[xx + yy * width];
 
                 yyy += 1;
@@ -251,12 +274,12 @@ void ed_init() {
             xxx += 1;
         }
 
-        push_u8array(&state.glyph_cache, &(GpuGlyph){
+        push_u8array(&state.glyph_cache, (uint8_t *)(&(GpuGlyph){
             .atlas_position = { (float)(x), (float)(y) },
             .size = { (float)width, (float)height },
             .position = { (float)x, (float)y },
             .y_offset = (float)(yoff),
-        }, 1 * sizeof(GpuGlyph));
+        }), 1 * sizeof(GpuGlyph));
 
         x += width;
     }
@@ -304,6 +327,28 @@ void ed_init() {
     queue_text(_String("But what even is text! []!@#$%^&*()_=+"), (float[]){ 0, 0 });
     queue_text(_String("v0.1.0"), (float[]){ 32, 128 });
     queue_text(_String("an_editor - what even"), (float[]){ 32, 256 });
+
+    state.ui_cx = init_ui_context();
+
+    string label = _String("Number 1");
+    ht_set(&state.ui_cx.cached_elements, label, &(ui_element_cache_data) {
+        .label = label,
+        .size = {
+            .axis = UI_AXIS_HORIZONTAL,
+            .computed_size = { 200, 256 },
+        }
+    });
+
+    for (size_t i = 0; i < state.ui_cx.cached_elements.capacity; ++i) {
+        if (state.ui_cx.cached_elements.key_slots[i].key.data != NULL) {
+            string text = state.ui_cx.cached_elements.key_slots[i].key;
+
+            ui_element_cache_data *value = ht_get(&state.ui_cx.cached_elements, text);
+            if (value) {
+                queue_text(text, (float[]){ (float)value->size.computed_size[0], (float)value->size.computed_size[1] });
+            }
+        }
+    }
 }
 void ed_frame() {
     if (state.gpu_glyphs.size > 0) {
@@ -315,8 +360,10 @@ void ed_frame() {
 
     GpuUniformParams gpu_uniform_params = {
         .screen_size = {
-            sapp_width(),
-            sapp_height()
+            sapp_widthf(),
+            sapp_heightf(),
+            0,
+            0
         },
     };
 

src/string.h

@@ -2,12 +2,25 @@
 #define ED_STRING_INCLUDED
 
 #include <stddef.h>
+#include <stdint.h>
 
-#define _String(text) ((string) { .data = text, .len = sizeof(text) })
+#define _String(text) ((string) { .data = (uint8_t*) text, .len = sizeof(text) })
 typedef struct {
-    char *data;
+    uint8_t *data;
     size_t len;
 } string;
 
-#endif
 
+#ifdef ED_STRING_IMPLEMENTATION
+bool string_eq(string a, string b) {
+    if (a.len != b.len) return false;
+
+    for (size_t i=0; i<a.len; ++i) {
+        if (a.data[i] != b.data[i]) return false;
+    }
+
+    return true;
+}
+
+#endif
+#endif

src/ui.h

@@ -6,7 +6,8 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
-#include "string.h"
+
+#include "ht.h"
 
 typedef enum {
     UI_AXIS_HORIZONTAL,
@@ -72,10 +73,19 @@ typedef struct {
 } ui_element_frame_data;
 
 typedef struct {
-    ed_ht *cached_elements;
+    ed_ht cached_elements;
 } ui_context;
 
-#endif
 
 #ifdef ED_UI_IMPLEMENTATION
+
+ui_context init_ui_context() {
+    ed_ht cached_elements = ht_create(32, sizeof(ui_element_cache_data));
+
+    return (ui_context) {
+        .cached_elements = cached_elements,
+    };
+}
+
+#endif
 #endif