Add abstraction for GPU shaders

src/CMakeLists.txt

@@ -7,6 +7,7 @@ SET(SRC_LIST
 		character.c
 		internal.c
 		tween.c
+		shader.c
 		)
 if (EMSCRIPTEN)
 	list(APPEND SRC_LIST emscripten-audio-stream.c)

src/internal.c

@@ -351,9 +351,16 @@ SYMBOL_INTERNAL struct libsuperderpy_list* AddToList(struct libsuperderpy_list*
 	return list;
 }
 
-SYMBOL_INTERNAL struct libsuperderpy_list* RemoveFromList(struct libsuperderpy_list** list, bool (*identity)(struct libsuperderpy_list* elem, void* data), void* data) {
+static bool Identity(struct libsuperderpy_list* elem, void* data) {
+	return elem->data == data;
+}
+
+SYMBOL_INTERNAL struct libsuperderpy_list* RemoveFromList(struct libsuperderpy_list** list, void* data, bool (*identity)(struct libsuperderpy_list* elem, void* data)) {
 	struct libsuperderpy_list *prev = NULL, *tmp = *list, *start;
 	void* d = NULL;
+	if (!identity) {
+		identity = Identity;
+	}
 	while (tmp) {
 		if (identity(tmp, data)) {
 			if (prev) {

src/internal.h

@@ -80,7 +80,7 @@ void* AddGarbage(struct Game* game, void* data);
 void ClearGarbage(struct Game* game);
 void ClearScreen(struct Game* game);
 struct libsuperderpy_list* AddToList(struct libsuperderpy_list* list, void* data);
-struct libsuperderpy_list* RemoveFromList(struct libsuperderpy_list** list, bool (*identity)(struct libsuperderpy_list* elem, void* data), void* data);
+struct libsuperderpy_list* RemoveFromList(struct libsuperderpy_list** list, void* data, bool (*identity)(struct libsuperderpy_list* elem, void* data));
 void AddTimeline(struct Game* game, struct Timeline* timeline);
 void RemoveTimeline(struct Game* game, struct Timeline* timeline);
 void DrawTimelines(struct Game* game);

src/libsuperderpy.c

@@ -73,6 +73,7 @@ SYMBOL_EXPORT struct Game* libsuperderpy_init(int argc, char** argv, const char*
 
 	game->_priv.garbage = NULL;
 	game->_priv.timelines = NULL;
+	game->_priv.shaders = NULL;
 
 	game->_priv.paused = false;
 

src/libsuperderpy.h

@@ -43,6 +43,7 @@ struct Game;
 #include "character.h"
 #include "config.h"
 #include "gamestate.h"
+#include "shader.h"
 #include "timeline.h"
 #include "tween.h"
 #include "utils.h"
@@ -123,7 +124,7 @@ struct Game {
 
 		struct Gamestate* current_gamestate;
 
-		struct libsuperderpy_list *garbage, *timelines;
+		struct libsuperderpy_list *garbage, *timelines, *shaders;
 
 		bool draw;
 

src/shader.c

@@ -0,0 +1,60 @@
+/*! \file shader.c
+ *  \brief GPU shaders abstraction.
+ */
+/*
+ * Copyright (c) Sebastian Krzyszkowiak <dos@dosowisko.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/>.
+ */
+#include "shader.h"
+#include "internal.h"
+#include <allegro5/allegro.h>
+#include <math.h>
+
+ALLEGRO_SHADER* CreateShader(struct Game* game, const char* vertex, const char* fragment) {
+	const char* log;
+
+	PrintConsole(game, "Creating shader V:%s F:%s...", vertex, fragment);
+
+	ALLEGRO_SHADER* shader = al_create_shader(ALLEGRO_SHADER_GLSL);
+	if (!al_attach_shader_source_file(shader, ALLEGRO_VERTEX_SHADER, vertex)) {
+		log = al_get_shader_log(shader);
+		if (log) {
+			PrintConsole(game, "%s", log);
+		}
+	}
+	if (!al_attach_shader_source_file(shader, ALLEGRO_PIXEL_SHADER, fragment)) {
+		log = al_get_shader_log(shader);
+		if (log) {
+			PrintConsole(game, "%s", log);
+		}
+	}
+	if (!al_build_shader(shader)) {
+		log = al_get_shader_log(shader);
+		if (log) {
+			PrintConsole(game, "%s", log);
+		}
+	}
+
+	game->_priv.shaders = AddToList(game->_priv.shaders, shader);
+
+	PrintConsole(game, "Shader compiled successfully.");
+
+	return shader;
+}
+
+void DestroyShader(struct Game* game, ALLEGRO_SHADER* shader) {
+	RemoveFromList(&game->_priv.shaders, shader, NULL);
+	al_destroy_shader(shader);
+}

src/shader.h

@@ -0,0 +1,29 @@
+/*! \file shader.h
+ *  \brief GPU shaders abstraction.
+ */
+/*
+ * Copyright (c) Sebastian Krzyszkowiak <dos@dosowisko.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 LIBSUPERDERPY_SHADER_H
+#define LIBSUPERDERPY_SHADER_H
+
+#include "libsuperderpy.h"
+
+ALLEGRO_SHADER *CreateShader(struct Game *game, const char* vertex, const char* fragment);
+void DestroyShader(struct Game *game, ALLEGRO_SHADER *shader);
+
+#endif

src/utils.c

@@ -27,6 +27,8 @@
 #include <stdio.h>
 #include <string.h>
 
+// TODO: split to separate files
+
 SYMBOL_EXPORT void DrawVerticalGradientRect(float x, float y, float w, float h, ALLEGRO_COLOR top, ALLEGRO_COLOR bottom) {
 	ALLEGRO_VERTEX v[] = {
 	  {.x = x, .y = y, .z = 0, .color = top},