/*
* Sets the viewport and matrix projection
*/
void S2D_GL_SetViewport(S2D_Window *window) {
int ortho_w = window->viewport.width;
int ortho_h = window->viewport.height;
int x, y, w, h; // calculated GL viewport values
x = 0; y = 0; w = window->width; h = window->height;
switch (window->viewport.mode) {
case S2D_FIXED:
w = window->orig_width;
h = window->orig_height;
y = window->height - h;
break;
case S2D_EXPAND:
ortho_w = w;
ortho_h = h;
break;
case S2D_SCALE:
S2D_GL_GetViewportScale(window, &w, &h, NULL);
// Center the viewport
x = window->width / 2.0 - w/2.0;
y = window->height / 2.0 - h/2.0;
break;
case S2D_STRETCH:
break;
}
glViewport(x, y, w, h);
// Set orthographic projection matrix
orthoMatrix[0] = 2.0f / (GLfloat)ortho_w;
orthoMatrix[5] = -2.0f / (GLfloat)ortho_h;
#if GLES
S2D_GLES_ApplyProjection(orthoMatrix);
#else
if (S2D_GL2) {
S2D_GL2_ApplyProjection(ortho_w, ortho_h);
} else {
S2D_GL3_ApplyProjection(orthoMatrix);
}
#endif
}
/*
* Get the mouse coordinates relative to the viewport
*/
void S2D_GetMouseOnViewport(S2D_Window *window, int wx, int wy, int *x, int *y) {
double scale; // viewport scale factor
int w, h; // width and height of scaled viewport
switch (window->viewport.mode) {
case S2D_FIXED:
*x = wx / (window->orig_width / (double)window->viewport.width);
*y = wy / (window->orig_height / (double)window->viewport.height);
break;
case S2D_SCALE:
S2D_GL_GetViewportScale(window, &w, &h, &scale);
*x = wx * 1 / scale - (window->width - w) / (2.0 * scale);
*y = wy * 1 / scale - (window->height - h) / (2.0 * scale);
break;
case S2D_STRETCH:
*x = wx * window->viewport.width / (double)window->width;
*y = wy * window->viewport.height / (double)window->height;
break;
}
}
