project for a (works on my devices) demo

demo/Makefile

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+include ../external.mk
+
+TARGET=main.exe
+
+OBJECTS=main.o
+
+FULL_BUILD_OBJECTS=${OBJECTS}
+
+
+GLUT_D=${PWD}
+
+LINKS=-lGLESv2 -lmyGLUT
+
+# same as the GL_STUFF MAKEFILE
+CFLAGS=-ansi -Wpedantic -Winline -Werror -std=c11
+
+all :
+	make -C ${GLUT_D}
+	make ${TARGET}
+
+
+# -L GLUT_D MUST GO AFTER THE L_SHLIBS, OTHERWISE ASSUMES THAT THE myGLUT DEPENDENCIES ARE SIMPLY UNMET
+# removed the space between -L and GLUT_D
+${TARGET} : ${OBJECTS}
+	${COMPILER} \
+	-o ${TARGET} \
+	${FULL_BUILD_OBJECTS} \
+	-Wl,-unresolved-symbols=ignore-in-shared-libs \
+	${L_SHLIBS} \
+	-L${GLUT_D} \
+	${LINKS}
+
+
+# -I ./ è una porcata clamorosa
+main.o : main.c ${GLUT_D}glut.h ${GLUT_D}glut_extensions.h
+	${COMPILER} \
+	${I_MY_GLUT} \
+	${I_GRAPHICS} \
+	-c ${CFLAGS} main.c \
+	${GLOBAL_COMPILE_CONF}
+
+.PHONY: clean debug
+
+clean: 
+	make clean -C ${GLUT_D}
+	-rm ${TARGET} ${OBJECTS} *~ core

demo/main.c

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+#include <stdlib.h>
+#include <stdio.h>
+
+#include <GLES2/gl2.h>
+
+#include <glut.h>
+#include <glut_extensions.h>
+
+const int TARGET_FPS = 15;
+static int ONE_TICK_MS = 1000 / TARGET_FPS;
+
+float viewSize = 2.0f;
+float aspect_ratio;
+int steps = 60;
+
+/* don't want to implement */
+/* also removed 
+	glEnable(GL_ALPHA_TEST);
+	glDisable(GL_ALPHA_TEST);
+*/
+GLuint GLUT_COMPATIBILITY_PROFILE = 0 ;
+GLuint GLUT_SINGLE = 0 ; 
+GLuint GLUT_RGBA = 0 ;
+const GLuint GLUT_SCREEN_WIDTH = 0;
+const GLuint GLUT_SCREEN_HEIGHT = 1;
+
+void glutInitContextVersion( int maj, int min){}
+void glutInitContextProfile( GLuint profile){}
+void glutInitDisplayMode( GLuint OR_ed_FLAGS){}
+
+int glutGet(GLuint dimension){
+	switch( dimension) {
+		case 0 :
+			return 1920;
+		break;
+		case 1 :
+			return 1152;
+		break;
+		default:
+			exit(1);
+	}
+}
+
+//funky stuff ahead
+void renderLoop() {
+
+	glClearColor( 0.0f, 1.0f, 0.0f, 1.0f);
+	glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+	glutSwapBuffers();
+}
+
+void timer(int value) {
+	printf("crashes here\n");
+	uint8_t touch_count;
+	touch_event **touch_buffer;
+	glutGetTouchProxy().get_tracked_events( &touch_buffer, &touch_count);
+	printf("%d touch_events\n", touch_count);
+	if( touch_count)
+		free_touch_events_array( touch_buffer, touch_count);
+
+	/*would have handled animations*/
+	glutTimerFunc(ONE_TICK_MS, timer, 0);
+	glutPostRedisplay();
+}
+
+void keypressed(unsigned char key, int x, int y) {
+	printf("pressed key %d\n", key);
+}
+
+void mousemoved(int x, int y) {
+	//camera.mouseMotion(x, y);
+}
+
+int main(int argc, char* argv[])  {
+	printf("i'm alive!\n");
+	glutInit(&argc, argv);
+	glutInitContextVersion(4, 0);
+	glutInitContextProfile(GLUT_COMPATIBILITY_PROFILE);
+	glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA);
+
+	int scrWidth = glutGet(GLUT_SCREEN_WIDTH) * 5 / 6;
+	int scrHeight = glutGet(GLUT_SCREEN_HEIGHT) * 5 / 6;
+	//scrWidth = 640;
+	//scrHeight = 480;
+	aspect_ratio = ( (float) scrWidth) / scrHeight;
+	glutInitWindowSize( scrWidth , scrHeight );
+	glutInitWindowPosition( 0, 0);
+	glutCreateWindow("TriDi");
+
+	glutTimerFunc(ONE_TICK_MS, timer, 0);
+	glutDisplayFunc(renderLoop);
+	glutKeyboardFunc(keypressed);
+	glutPassiveMotionFunc(mousemoved);
+
+	/*check what MESA has to offer*/
+	const GLubyte *extensions = glGetString(GL_EXTENSIONS);
+	printf("%s\n", extensions);
+
+	glutMainLoop();
+}