*: initial implementation of pig

This is nothing to write home about, but it provides a little sandbox for
developing shader-generated textures in the spirit of shadertoy or the
demoscene tool bonzomatic.

It's more oriented towards developing shaders for use with libstage in
the small games I've been hacking on.

1 files changed, 47 insertions, 0 deletions

diff --git a/src/pig.h b/src/pig.h
new file mode 100644
index 0000000..7042a3f
--- /dev/null
+++ b/src/pig.h
@@ -0,0 +1,47 @@
+/*
+ *  Copyright (C) 2020 - Vito Caputo - <vcaputo@pengaru.com>
+ *
+ *  This program is free software: you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 3 as published
+ *  by the Free Software Foundation.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _PIG_H
+#define _PIG_H
+
+#include <SDL.h>
+
+#include <stage.h>
+
+#include "m4f.h"
+#include "v3f.h"
+
+typedef struct pig_t {
+	SDL_Window	*window;
+	SDL_GLContext	*gl;
+	stage_t		*stage;
+	unsigned	window_width, window_height;
+	unsigned	windowed:1;
+	m4f_t		transform;
+	float		seed;
+	v3f_t		color;
+} pig_t;
+
+void pig_canvas_size(pig_t *pig, int *res_width, int *res_height);
+void pig_canvas_to_ndc(pig_t *pig, int x, int y, float *res_x, float *res_y);
+void pig_canvas_from_ndc(pig_t *pig, float x, float y, int *res_x, int *res_y);
+void pig_viewport_size(pig_t *pig, int *res_width, int *res_height);
+void pig_viewport_to_ndc(pig_t *pig, int x, int y, float *res_x, float *res_y);
+void pig_viewport_from_ndc(pig_t *pig, float x, float y, int *res_x, int *res_y);
+uint32_t pig_viewport_id(pig_t *pig);
+void pig_toggle_fullscreen(pig_t *pig);
+
+#endif