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map coordinates 1:1 to pixels

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This commit is contained in:
Josh Holtrop 2014-06-17 23:26:46 -04:00
parent 193a23e682
commit 51b8e2109f
1 changed files with 13 additions and 6 deletions
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19
sdl_tmplt.c
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@ -14,20 +14,27 @@ void init(void)
glViewport(0, 0, WIDTH, HEIGHT); glViewport(0, 0, WIDTH, HEIGHT);
glMatrixMode(GL_PROJECTION); glMatrixMode(GL_PROJECTION);
glLoadIdentity(); glLoadIdentity();
gluPerspective(60.0, (GLfloat)WIDTH/(GLfloat)WIDTH, 1.0, 30.0); glOrtho(-0.5, WIDTH - 0.5, -0.5, HEIGHT - 0.5, -1, 1);
glMatrixMode(GL_MODELVIEW); glMatrixMode(GL_MODELVIEW);
glLoadIdentity(); glLoadIdentity();
glTranslatef(0.0, 0.0, -3.6);
} }
void display(SDL_Window * window) void display(SDL_Window * window)
{ {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glColor3f(1, 1, 1);
glBegin(GL_QUADS); glBegin(GL_QUADS);
glVertex3f(-2.0, -1.0, 0.0); glVertex3f(10, HEIGHT / 2, 0.0);
glVertex3f(-2.0, 1.0, 0.0); glVertex3f(10, 3 * HEIGHT / 4, 0.0);
glVertex3f(0.0, 1.0, 0.0); glVertex3f(WIDTH / 2, 3 * HEIGHT / 4, 0.0);
glVertex3f(0.0, -1.0, 0.0); glVertex3f(WIDTH / 2, HEIGHT / 2, 0.0);
glEnd();
glColor3f(1, 0.6, 0);
glBegin(GL_LINE_LOOP);
glVertex2f(0, 0);
glVertex2f(WIDTH - 1, 0);
glVertex2f(WIDTH - 1, HEIGHT - 1);
glVertex2f(0, HEIGHT - 1);
glEnd(); glEnd();
SDL_GL_SwapWindow(window); SDL_GL_SwapWindow(window);
} }