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nuklear/demo/allegro5/allegro.c

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/*
Copyright (c) 2016 Micha Mettke
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdarg.h>
#include <string.h>
#include <math.h>
#include <assert.h>
#include <math.h>
#include <allegro5/allegro.h>
#include <allegro5/allegro_primitives.h>
/* macros */
#define MAX_VERTEX_MEMORY 512 * 1024
#define MAX_ELEMENT_MEMORY 128 * 1024
#define DEMO_DO_NOT_DRAW_IMAGES
#include "../../zahnrad.h"
#include "../demo.c"
struct device {
ALLEGRO_DISPLAY *display;
ALLEGRO_EVENT_QUEUE *queue;
ALLEGRO_BITMAP *texture;
ALLEGRO_VERTEX_DECL *vertex_decl;
struct zr_draw_null_texture null;
struct zr_buffer cmds;
void *vertex_buffer;
void *element_buffer;
};
struct allegro_vertex {
struct zr_vec2 pos;
struct zr_vec2 uv;
ALLEGRO_COLOR col;
};
static void
die(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputs("\n", stderr);
exit(EXIT_FAILURE);
}
static char*
file_load(const char* path, size_t* siz)
{
char *buf;
FILE *fd = fopen(path, "rb");
if (!fd) die("Failed to open file: %s\n", path);
fseek(fd, 0, SEEK_END);
*siz = (size_t)ftell(fd);
fseek(fd, 0, SEEK_SET);
buf = (char*)calloc(*siz, 1);
fread(buf, *siz, 1, fd);
fclose(fd);
return buf;
}
static void
device_init(struct device *dev)
{
ALLEGRO_VERTEX_ELEMENT elems[] = {
{ALLEGRO_PRIM_POSITION, ALLEGRO_PRIM_FLOAT_2, offsetof(struct allegro_vertex, pos)},
{ALLEGRO_PRIM_TEX_COORD, ALLEGRO_PRIM_FLOAT_2, offsetof(struct allegro_vertex, uv)},
{ALLEGRO_PRIM_COLOR_ATTR, 0, offsetof(struct allegro_vertex, col)},
{0,0,0}
};
dev->vertex_decl = al_create_vertex_decl(elems, sizeof(struct allegro_vertex));
/* allocate memory for drawing process */
dev->vertex_buffer = calloc(MAX_VERTEX_MEMORY, 1);
dev->element_buffer = calloc(MAX_ELEMENT_MEMORY, 1);
}
static void
device_shutdown(struct device *dev)
{
free(dev->vertex_buffer);
free(dev->element_buffer);
zr_buffer_free(&dev->cmds);
}
static void
device_upload_atlas(struct device *dev, const void *image, int width, int height)
{
/* create allegro font bitmap */
ALLEGRO_BITMAP *bitmap = 0;
int flags = al_get_new_bitmap_flags();
int fmt = al_get_new_bitmap_format();
al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP|ALLEGRO_MIN_LINEAR|ALLEGRO_MAG_LINEAR);
al_set_new_bitmap_format(ALLEGRO_PIXEL_FORMAT_ABGR_8888_LE);
bitmap = al_create_bitmap(width, height);
al_set_new_bitmap_flags(flags);
al_set_new_bitmap_format(fmt);
assert(bitmap);
{
/* copy font texture into bitmap */
ALLEGRO_LOCKED_REGION * locked_img;
locked_img = al_lock_bitmap(bitmap, al_get_bitmap_format(bitmap), ALLEGRO_LOCK_WRITEONLY);
assert(locked_img);
memcpy(locked_img->data, image, sizeof(uint32_t)*(size_t)(width*height));
al_unlock_bitmap(bitmap);
}
/* convert software texture into hardware texture */
dev->texture = al_clone_bitmap(bitmap);
al_destroy_bitmap(bitmap);
assert(dev->texture);
}
static void
device_draw(struct device *dev, struct zr_context *ctx, enum zr_anti_aliasing AA)
{
int op, src, dst;
al_get_blender(&op, &src, &dst);
al_set_blender(ALLEGRO_ADD, ALLEGRO_ALPHA, ALLEGRO_INVERSE_ALPHA);
{
const struct zr_draw_command *cmd;
struct zr_buffer vbuf, ebuf;
int offset = 0;
struct allegro_vertex *vertices = 0;
int *indicies = 0;
/* fill converting configuration */
struct zr_convert_config config;
memset(&config, 0, sizeof(config));
config.global_alpha = 1.0f;
config.shape_AA = AA;
config.line_AA = AA;
config.circle_segment_count = 22;
config.arc_segment_count = 22;
config.curve_segment_count = 22;
config.null = dev->null;
/* convert from command into hardware format */
zr_buffer_init_fixed(&vbuf, dev->vertex_buffer, MAX_VERTEX_MEMORY);
zr_buffer_init_fixed(&ebuf, dev->element_buffer, MAX_ELEMENT_MEMORY);
zr_convert(ctx, &dev->cmds, &vbuf, &ebuf, &config);
{
/* <sign> allegro does not support 32-bit packed color */
unsigned int i = 0;
struct zr_draw_vertex *verts = (struct zr_draw_vertex*)dev->vertex_buffer;
vertices = calloc(sizeof(struct allegro_vertex), ctx->canvas.vertex_count);
for (i = 0; i < ctx->canvas.vertex_count; ++i) {
zr_byte *c;
vertices[i].pos = verts[i].position;
vertices[i].uv = verts[i].uv;
c = (zr_byte*)&verts[i].col;
vertices[i].col = al_map_rgba(c[0], c[1], c[2], c[3]);
}
}
{
/* <massive sign> allegro does not support 16-bit indicies:
* @OPT: define zr_draw_index as int to fix this issue. */
unsigned int i = 0;
zr_draw_index *elements = (zr_draw_index*)dev->element_buffer;
indicies = calloc(sizeof(int), ctx->canvas.element_count);
for (i = 0; i < ctx->canvas.element_count; ++i)
indicies[i] = elements[i];
}
/* iterate over and execute each draw command */
zr_draw_foreach(cmd, ctx, &dev->cmds)
{
ALLEGRO_BITMAP *texture = cmd->texture.ptr;
if (!cmd->elem_count) continue;
al_set_clipping_rectangle((int)cmd->clip_rect.x, (int)cmd->clip_rect.y,
(int)cmd->clip_rect.w, (int)cmd->clip_rect.h);
al_draw_indexed_prim(vertices, dev->vertex_decl, texture, &indicies[offset],
(int)cmd->elem_count, ALLEGRO_PRIM_TRIANGLE_LIST);
offset += cmd->elem_count;
}
free(vertices);
free(indicies);
zr_clear(ctx);
}
al_set_blender(op, src, dst);
al_set_clipping_rectangle(0,0,al_get_display_width(dev->display),
al_get_display_height(dev->display));
}
static void
input_key(struct zr_context *ctx, ALLEGRO_EVENT *evt, int down)
{
int sym = evt->keyboard.keycode;
if (sym == ALLEGRO_KEY_RSHIFT || sym == ALLEGRO_KEY_LSHIFT)
zr_input_key(ctx, ZR_KEY_SHIFT, down);
else if (sym == ALLEGRO_KEY_DELETE)
zr_input_key(ctx, ZR_KEY_DEL, down);
else if (sym == ALLEGRO_KEY_ENTER)
zr_input_key(ctx, ZR_KEY_ENTER, down);
else if (sym == ALLEGRO_KEY_TAB)
zr_input_key(ctx, ZR_KEY_TAB, down);
else if (sym == ALLEGRO_KEY_BACKSPACE)
zr_input_key(ctx, ZR_KEY_BACKSPACE, down);
else if (sym == ALLEGRO_KEY_LEFT)
zr_input_key(ctx, ZR_KEY_LEFT, down);
else if (sym == ALLEGRO_KEY_RIGHT)
zr_input_key(ctx, ZR_KEY_RIGHT, down);
else if (sym == ALLEGRO_KEY_C)
zr_input_key(ctx, ZR_KEY_COPY, down && evt->keyboard.modifiers & ALLEGRO_KEYMOD_CTRL);
else if (sym == ALLEGRO_KEY_V)
zr_input_key(ctx, ZR_KEY_PASTE, down && evt->keyboard.modifiers & ALLEGRO_KEYMOD_CTRL);
else if (sym == ALLEGRO_KEY_X)
zr_input_key(ctx, ZR_KEY_CUT, down && evt->keyboard.modifiers & ALLEGRO_KEYMOD_CTRL);
}
static void
input_button(struct zr_context *ctx, ALLEGRO_EVENT *evt, int down)
{
const int x = evt->mouse.x;
const int y = evt->mouse.y;
if (evt->mouse.button == 1)
zr_input_button(ctx, ZR_BUTTON_LEFT, x, y, down);
if (evt->mouse.button == 2)
zr_input_button(ctx, ZR_BUTTON_RIGHT, x, y, down);
}
int
main(int argc, char *argv[])
{
struct device dev;
int running = 1;
struct demo gui;
struct zr_font *font;
struct zr_font_atlas atlas;
const char *font_path = (argc > 1) ? argv[1]: 0;
/* Allegro */
al_init();
al_install_keyboard();
al_install_mouse();
al_init_primitives_addon();
dev.display = al_create_display(WINDOW_WIDTH, WINDOW_HEIGHT);
al_set_window_title(dev.display, "Zahnrad");
dev.queue = al_create_event_queue();
al_register_event_source(dev.queue, al_get_display_event_source(dev.display));
al_register_event_source(dev.queue, al_get_keyboard_event_source());
al_register_event_source(dev.queue, al_get_mouse_event_source());
device_init(&dev);
{
/* Font */
const void *image;
int width, height;
zr_font_atlas_init_default(&atlas);
zr_font_atlas_begin(&atlas);
if (font_path) font = zr_font_atlas_add_from_file(&atlas, font_path, 14.0f, NULL);
else font = zr_font_atlas_add_default(&atlas, 14.0f, NULL);
image = zr_font_atlas_bake(&atlas, &width, &height, ZR_FONT_ATLAS_RGBA32);
device_upload_atlas(&dev, image, width, height);
zr_font_atlas_end(&atlas, zr_handle_ptr(dev.texture), &dev.null);
/* GUI */
memset(&gui, 0, sizeof(gui));
zr_buffer_init_default(&dev.cmds);
zr_init_default(&gui.ctx, &font->handle);
}
while (running) {
/* Input */
ALLEGRO_EVENT evt;
zr_input_begin(&gui.ctx);
while (al_get_next_event(dev.queue, &evt)) {
if (evt.type == ALLEGRO_EVENT_DISPLAY_CLOSE) goto cleanup;
else if (evt.type == ALLEGRO_EVENT_KEY_UP && evt.keyboard.display == dev.display)
input_key(&gui.ctx, &evt, zr_false);
else if (evt.type == ALLEGRO_EVENT_KEY_DOWN && evt.keyboard.display == dev.display)
input_key(&gui.ctx, &evt, zr_true);
else if (evt.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN)
input_button(&gui.ctx, &evt, zr_true);
else if (evt.type == ALLEGRO_EVENT_MOUSE_BUTTON_UP)
input_button(&gui.ctx, &evt, zr_false);
else if (evt.type == ALLEGRO_EVENT_MOUSE_AXES) {
zr_input_motion(&gui.ctx, evt.mouse.x, evt.mouse.y);
} else if (evt.type == ALLEGRO_EVENT_KEY_CHAR) {
if (evt.keyboard.display == dev.display)
if (evt.keyboard.unichar > 0 && evt.keyboard.unichar < 0x10000)
zr_input_unicode(&gui.ctx, (zr_rune)evt.keyboard.unichar);
}
}
zr_input_end(&gui.ctx);
/* GUI */
running = run_demo(&gui);
/* Draw */
al_clear_to_color(al_map_rgba_f(0.2f, 0.2f, 0.2f, 1.0f));
device_draw(&dev, &gui.ctx, ZR_ANTI_ALIASING_ON);
al_flip_display();
}
cleanup:
/* Cleanup */
if (dev.texture)
al_destroy_bitmap(dev.texture);
if (dev.queue)
al_destroy_event_queue(dev.queue);
if (dev.display)
al_destroy_display(dev.display);
zr_font_atlas_clear(&atlas);
device_shutdown(&dev);
zr_free(&gui.ctx);
return 0;
}
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