samples/clock/.gitignore

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+Clock
+profile.dtrace
+profile.spall

samples/clock/build.bat

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+@echo off
+
+:: compile wasm module
+set wasmFlags=--target=wasm32^
+       --no-standard-libraries ^
+       -fno-builtin ^
+       -Wl,--no-entry ^
+       -Wl,--export-dynamic ^
+       -g ^
+       -O2 ^
+       -mbulk-memory ^
+       -D__ORCA__ ^
+       -isystem ..\..\src\libc-shim\include ^
+       -I..\..\ext -I ..\..\src
+
+clang %wasmFlags% -o .\module.wasm ..\..\src\orca.c ..\..\src\libc-shim\src\*.c src\main.c
+IF %ERRORLEVEL% NEQ 0 EXIT /B %ERRORLEVEL%
+
+orca bundle --orca-dir ..\.. --name Clock --icon icon.png --resource-dir data module.wasm

samples/clock/build.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+if [[ -x /usr/local/opt/llvm/bin/clang ]]; then
+  CLANG=/usr/local/opt/llvm/bin/clang
+elif [[ -x /opt/homebrew/opt/llvm/bin/clang ]]; then
+  CLANG=/opt/homebrew/opt/llvm/bin/clang
+else
+  echo "Could not find Homebrew clang; this script will probably not work."
+  CLANG=clang
+fi
+
+ORCA_DIR=../..
+STDLIB_DIR=../../src/libc-shim
+
+wasmFlags="--target=wasm32 \
+  --no-standard-libraries \
+  -fno-builtin \
+  -Wl,--no-entry \
+  -Wl,--export-dynamic \
+  -g \
+  -O2 \
+  -mbulk-memory \
+  -D__ORCA__ \
+  -I $STDLIB_DIR/include \
+  -I $ORCA_DIR/ext \
+  -I $ORCA_DIR/src"
+
+$CLANG $wasmFlags -o ./module.wasm ../../src/orca.c $STDLIB_DIR/src/*.c src/main.c
+
+orca bundle --orca-dir ../.. --name Clock --icon icon.png --resource-dir data module.wasm

samples/clock/src/main.c

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+#include <math.h>
+
+#include <orca.h>
+
+#define ARRAYSIZE(array) (sizeof(array) / sizeof(array[0]))
+
+oc_vec2 frameSize = { 100, 100 };
+
+oc_surface surface;
+oc_canvas canvas;
+oc_font font;
+
+f64 lastSeconds = 0;
+
+oc_mat2x3 mat_rotation(f32 radians);
+oc_mat2x3 mat_translation(f32 x, f32 y);
+oc_mat2x3 mat_transform(f32 x, f32 y, f32 radians);
+f32 minf(f32 a, f32 b);
+
+ORCA_EXPORT void oc_on_init(void)
+{
+    surface = oc_surface_canvas();
+    canvas = oc_canvas_create();
+
+    {
+        oc_str8 filename = OC_STR8("/segoeui.ttf");
+        oc_file file = oc_file_open(filename, OC_FILE_ACCESS_READ, 0);
+        if(oc_file_last_error(file) != OC_IO_OK)
+        {
+            oc_log_error("Couldn't open file %s\n", oc_str8_to_cstring(oc_scratch(), filename));
+        }
+        u64 size = oc_file_size(file);
+        char* buffer = oc_arena_push(oc_scratch(), size);
+        oc_file_read(file, size, buffer);
+        oc_file_close(file);
+
+        oc_unicode_range ranges[5] = { OC_UNICODE_BASIC_LATIN,
+                                       OC_UNICODE_C1_CONTROLS_AND_LATIN_1_SUPPLEMENT,
+                                       OC_UNICODE_LATIN_EXTENDED_A,
+                                       OC_UNICODE_LATIN_EXTENDED_B,
+                                       OC_UNICODE_SPECIALS };
+        font = oc_font_create_from_memory(oc_str8_from_buffer(size, buffer), 5, ranges);
+    }
+
+    oc_arena_clear(oc_scratch());
+}
+
+ORCA_EXPORT void oc_on_resize(u32 width, u32 height)
+{
+    frameSize.x = width;
+    frameSize.y = height;
+}
+
+ORCA_EXPORT void oc_on_frame_refresh(void)
+{
+    const oc_str8 clock_number_strings[] = {
+        OC_STR8("12"),
+        OC_STR8("1"),
+        OC_STR8("2"),
+        OC_STR8("3"),
+        OC_STR8("4"),
+        OC_STR8("5"),
+        OC_STR8("6"),
+        OC_STR8("7"),
+        OC_STR8("8"),
+        OC_STR8("9"),
+        OC_STR8("10"),
+        OC_STR8("11"),
+    };
+
+    oc_canvas_set_current(canvas);
+    oc_surface_select(surface);
+    oc_set_color_rgba(.05, .05, .05, 1);
+    oc_clear();
+
+    const f64 timestampSecs = oc_clock_time(OC_CLOCK_DATE);
+    const f64 secs = fmod(timestampSecs, 60);
+    const f64 minutes = fmod(timestampSecs, 60 * 60) / 60;
+    const f64 hours = fmod(timestampSecs, 60 * 60 * 24) / (60 * 60);
+    const f64 hoursAs12Format = fmod(hours, 12.0);
+
+    if(lastSeconds != floor(secs))
+    {
+        lastSeconds = floor(secs);
+        oc_log_info("current time: %.0f:%.0f:%.0f", floor(hours), floor(minutes), floor(secs));
+    }
+
+    const f32 secondsRotation = (M_PI * 2) * (secs / 60.0) - (M_PI / 2);
+    const f32 minutesRotation = (M_PI * 2) * (minutes / 60.0) - (M_PI / 2);
+    const f32 hoursRotation = (M_PI * 2) * (hoursAs12Format / 12.0) - (M_PI / 2);
+
+    const f32 centerX = frameSize.x / 2;
+    const f32 centerY = frameSize.y / 2;
+    const f32 clockRadius = minf(frameSize.x, frameSize.y) * 0.5f * 0.85f;
+
+    const f32 DEFAULT_CLOCK_RADIUS = 260;
+    const f32 uiScale = clockRadius / DEFAULT_CLOCK_RADIUS;
+
+    const f32 fontSize = 26 * uiScale;
+    oc_set_font(font);
+    oc_set_font_size(fontSize);
+
+    // clock backing
+    oc_set_color_rgba(1, 1, 1, 1);
+    oc_circle_fill(centerX, centerY, clockRadius);
+
+    // clock face
+    for(int i = 0; i < ARRAYSIZE(clock_number_strings); ++i)
+    {
+        const f32 rot = -i * ((M_PI * 2) / 12.0f) + (M_PI / 2);
+        const f32 sinRot = sinf(rot);
+        const f32 cosRot = cosf(rot);
+
+        oc_rect textRect = oc_text_bounding_box(font, fontSize, clock_number_strings[i]);
+        textRect.h -= 10 * uiScale; // oc_text_bounding_box height doesn't seem to be a tight fit around the glyph
+
+        const f32 x = cosRot * clockRadius * 0.8f - (textRect.w / 2) + centerX;
+        const f32 y = -sinRot * clockRadius * 0.8f + (textRect.h / 2) + centerY;
+
+        oc_set_color_rgba(0.2, 0.2, 0.2, 1);
+        oc_move_to(x, y);
+        oc_text_outlines(clock_number_strings[i]);
+        oc_fill();
+    }
+
+    oc_matrix_push(mat_transform(centerX, centerY, hoursRotation));
+    {
+        oc_set_color_rgba(.2, 0.2, 0.2, 1);
+        oc_rounded_rectangle_fill(0, -7.5 * uiScale, clockRadius * 0.5f, 15 * uiScale, 5 * uiScale);
+
+        oc_matrix_pop();
+    }
+
+    oc_matrix_push(mat_transform(centerX, centerY, minutesRotation));
+    {
+        oc_set_color_rgba(.2, 0.2, 0.2, 1);
+        oc_rounded_rectangle_fill(0, -5 * uiScale, clockRadius * 0.7f, 10 * uiScale, 5 * uiScale);
+
+        oc_matrix_pop();
+    }
+
+    oc_matrix_push(mat_transform(centerX, centerY, secondsRotation));
+    {
+        oc_set_color_rgba(1, 0.2, 0.2, 1);
+        oc_rounded_rectangle_fill(0, -2.5 * uiScale, clockRadius * 0.8f, 5 * uiScale, 5 * uiScale);
+
+        oc_matrix_pop();
+    }
+
+    oc_set_color_rgba(.2, 0.2, 0.2, 1);
+    oc_circle_fill(centerX, centerY, 10 * uiScale);
+
+    oc_render(surface, canvas);
+    oc_surface_present(surface);
+}
+
+oc_mat2x3 mat_rotation(f32 radians)
+{
+    const f32 sinRot = sinf(radians);
+    const f32 cosRot = cosf(radians);
+    oc_mat2x3 rot = {
+        cosRot, -sinRot, 0,
+        sinRot, cosRot, 0
+    };
+    return rot;
+}
+
+oc_mat2x3 mat_translation(f32 x, f32 y)
+{
+    oc_mat2x3 translation = {
+        1, 0, x,
+        0, 1, y
+    };
+    return translation;
+}
+
+oc_mat2x3 mat_transform(f32 x, f32 y, f32 radians)
+{
+    oc_mat2x3 rotation = mat_rotation(radians);
+    oc_mat2x3 translation = mat_translation(x, y);
+    return oc_mat2x3_mul_m(translation, rotation);
+}
+
+f32 minf(f32 a, f32 b)
+{
+    return (a < b) ? a : b;
+}