Initial commit

.gitignore

@@ -0,0 +1 @@
+build/**

Makefile

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+CC = gcc
+CFLAGS = -Wall -Wshadow -Werror
+LDFLAGS = -lc
+
+SRCS := $(wildcard src/modules/*.c)
+OBJS := $(patsubst src/modules/%.c,%,$(SRCS))
+
+%:
+	mkdir -p build/modules
+	$(CC) $(CFLAGS) src/modules/$@.c -o build/modules/$@.so -shared -fPIC -rdynamic
+
+all: $(OBJS)
+	gcc -std=c23 -g -o build/twm src/core/*.c $(CFLAGS) $(LDFLAGS) -ldl
+
+clean:
+	rm -rf build/*

src/core/main.c

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+#include "twm.h"
+
+int main(int argc, char* argv[]) {
+	ModuleDisplay m = load_display_module("modules/fb.so");
+	if (m.init == 0) abort();
+	return 0;
+}

src/core/module.c

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+#include "twm.h"
+#include <stdio.h>
+#include <dlfcn.h>
+
+ModuleDisplay load_display_module(char* name) {
+	void* dl = dlopen(name, RTLD_LAZY);
+	if (dl == NULL) {
+		fflush(stdout);
+		fprintf(stderr, "Failed to load module %s (%s)\n", name, dlerror());
+		fflush(stderr);
+		return (ModuleDisplay){0};
+	}
+
+	ModuleDisplay m = {0};
+	m.dll = dl;
+	m.init = (DisplayInit)dlsym(dl, "display_init");
+	if (m.init == NULL) goto error;
+	m.blit = (DisplayBlit)dlsym(dl, "display_blit");
+	if (m.blit == NULL) goto error;
+	m.flip = (DisplayFlip)dlsym(dl, "display_flip");
+	if (m.flip == NULL) goto error;
+	m.close = (DisplayClose)dlsym(dl, "display_close");
+	if (m.close == NULL) goto error;
+	m.put_pixel = (DisplayPutPixel)dlsym(dl, "display_put_pixel");
+	if (m.put_pixel == NULL) goto error;
+	return m;
+
+error:
+	fflush(stdout);
+	fprintf(stderr, "Failed to load module %s (%s)\n", name, dlerror());
+	fflush(stderr);
+	dlclose(dl);
+	return (ModuleDisplay){0};
+}

src/core/module_display.h

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+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct {
+	uint8_t red;
+	uint8_t green;
+	uint8_t blue;
+} Color;
+
+typedef struct {
+	int x;
+	int y;
+} Vec2;
+
+typedef struct {
+	Vec2 pos;
+	Vec2 size;
+} Rect;
+
+typedef struct {
+	Rect size;
+	Color *data;
+} Image;
+
+typedef bool (*DisplayInit)(void**);
+typedef void (*DisplayPutPixel)(void*, Vec2, Color);
+typedef void (*DisplayBlit)(void*, Vec2, Image);
+typedef void (*DisplayFlip)(void*);
+typedef void (*DisplayClose)(void*);
+
+typedef struct {
+	void* dll;
+	DisplayInit init;
+	DisplayPutPixel put_pixel;
+	DisplayBlit blit;
+	DisplayFlip flip;
+	DisplayClose close;
+} ModuleDisplay;

src/core/twm.h

@@ -0,0 +1,8 @@
+#ifndef _TWM_H
+#define _TWM_H
+#include "module_display.h"
+#include <stdlib.h>
+
+ModuleDisplay load_display_module(char* name);
+
+#endif

src/module_display.h

@@ -0,0 +1,38 @@
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef struct {
+	uint8_t red;
+	uint8_t green;
+	uint8_t blue;
+} Color;
+
+typedef struct {
+	int x;
+	int y;
+} Vec2;
+
+typedef struct {
+	Vec2 pos;
+	Vec2 size;
+} Rect;
+
+typedef struct {
+	Rect size;
+	Color *data;
+} Image;
+
+typedef bool (*DisplayInit)(void**);
+typedef void (*DisplayPutPixel)(void*, Vec2, Color);
+typedef void (*DisplayBlit)(void*, Vec2, Image);
+typedef void (*DisplayFlip)(void*);
+typedef void (*DisplayClose)(void*);
+
+typedef struct {
+	void* dll;
+	DisplayInit init;
+	DisplayPutPixel put_pixel;
+	DisplayBlit blit;
+	DisplayFlip flip;
+	DisplayClose close;
+} ModuleDisplay;

src/modules/fb.c

@@ -0,0 +1 @@
+void t(){}

src/twm.h

@@ -0,0 +1,8 @@
+#ifndef _TWM_H
+#define _TWM_H
+#include "module_display.h"
+#include <stdlib.h>
+
+ModuleDisplay load_display_module(char* name);
+
+#endif