OpenHarmony/third_party_mesa3d
2
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

trivial/tri-viewport.c - add guide lines, more triangles, make interactive

Browse Source 
This is becoming more like a test than a trivial/ example.
This commit is contained in:
Keith Whitwell
2009-04-20 15:50:44 +01:00
parent 53c6467aea
commit c691f96e98
1 changed files with 119 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

134
progs/trivial/tri-viewport.c
View File

@@ -29,6 +29,10 @@
GLenum doubleBuffer = 1;
int win;
static float tx = 0;
static float ty = 0;
static float tw = 250;
static float th = 250;
static void Init(void)
{
@@ -42,15 +46,11 @@ static void Init(void)
static void Reshape(int width, int height)
{
glViewport(width / -2.0, height / -2.0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
tw = width;
th = height;
}
static void Key(unsigned char key, int x, int y)
{
switch (key) {
@@ -62,19 +62,91 @@ static void Key(unsigned char key, int x, int y)
}
}
static void Draw(void)
{
int i;
fprintf(stderr, "%f %f\n", tx, ty);
fflush(stderr);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
glMatrixMode(GL_MODELVIEW);
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
glColor3f(.8,0,0);
glVertex3f(-0.9, 0.9, -30.0);
glColor3f(0,.9,0);
glVertex3f( 0.9, 0.9, -30.0);
glColor3f(0,0,.7);
glVertex3f( 0.0, -0.9, -30.0);
glViewport(0, 0, tw, th);
glBegin(GL_LINES);
glColor3f(1,1,0);
glVertex3f(-1, 0, -30.0);
glVertex3f(1, 0, -30.0);
glVertex3f(0, -1, -30.0);
glVertex3f(0, 1, -30.0);
glEnd();
/*
*/
glViewport(tx, ty, tw, th);
glBegin(GL_TRIANGLES);
glColor3f(1,0,0);
glVertex3f(-1, -1, -30.0);
glVertex3f(0, -1, -30.0);
glVertex3f(-.5, -.5, -30.0);
glColor3f(1,1,1);
glVertex3f(0, -1, -30.0);
glVertex3f(1, -1, -30.0);
glVertex3f(.5, -.5, -30.0);
glVertex3f(-.5, -.5, -30.0);
glVertex3f(.5, -.5, -30.0);
glVertex3f(0, 0, -30.0);
glColor3f(0,1,0);
glVertex3f(1, 1, -30.0);
glVertex3f(0, 1, -30.0);
glVertex3f(.5, .5, -30.0);
glColor3f(1,1,1);
glVertex3f(0, 1, -30.0);
glVertex3f(-1, 1, -30.0);
glVertex3f(-.5, .5, -30.0);
glVertex3f(.5, .5, -30.0);
glVertex3f(-.5, .5, -30.0);
glVertex3f( 0, 0, -30.0);
glEnd();
glViewport(0, 0, tw, th);
glBegin(GL_LINES);
glColor3f(.5,.5,0);
for (i = -10; i < 10; i++) {
float f = i / 10.0;
if (i == 0)
continue;
glVertex3f(-1, f, -30.0);
glVertex3f(1, f, -30.0);
glVertex3f(f, -1, -30.0);
glVertex3f(f, 1, -30.0);
}
glEnd();
glFlush();
if (doubleBuffer) {
@@ -86,6 +158,13 @@ static GLenum Args(int argc, char **argv)
{
GLint i;
if (getenv("VPX"))
tx = atof(getenv("VPX"));
if (getenv("VPY"))
ty = atof(getenv("VPY"));
for (i = 1; i < argc; i++) {
if (strcmp(argv[i], "-sb") == 0) {
doubleBuffer = GL_FALSE;
@@ -99,6 +178,30 @@ static GLenum Args(int argc, char **argv)
return GL_TRUE;
}
static void
special(int k, int x, int y)
{
switch (k) {
case GLUT_KEY_UP:
ty += 1.0;
break;
case GLUT_KEY_DOWN:
ty -= 1.0;
break;
case GLUT_KEY_LEFT:
tx -= 1.0;
break;
case GLUT_KEY_RIGHT:
tx += 1.0;
break;
default:
return;
}
glutPostRedisplay();
}
int main(int argc, char **argv)
{
GLenum type;
@@ -123,7 +226,8 @@ int main(int argc, char **argv)
Init();
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutKeyboardFunc(Key);
glutSpecialFunc(special);
glutDisplayFunc(Draw);
glutMainLoop();
return 0;