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working on perspective stuff for tilted menu items

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This commit is contained in:
Chris Danford
2003-04-23 02:23:51 +00:00
parent 022a34dda4
commit 1be7055f59
3 changed files with 73 additions and 15 deletions
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stepmania/src/RageDisplay.cpp
+66 -15
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@@ -148,22 +148,8 @@ void RageDisplay::SetupOpenGL()
glHint(GL_POINT_SMOOTH_HINT, GL_DONT_CARE);
/* Initialize the default ortho projection. */
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
float left = 0, right = SCREEN_WIDTH, bottom = SCREEN_HEIGHT, top = 0;
if(strncmp((const char*)glGetString(GL_RENDERER),"GLDirect",strlen("GLDirect"))==0)
{
/* GLDirect incorrectly uses Direct3D's device coordinate system
* instead of OpenGL's, so we need to compensate. */
left += 0.5f;
right += 0.5f;
bottom += 0.5f;
top += 0.5f;
}
glOrtho(left, right, bottom, top, SCREEN_NEAR, SCREEN_FAR );
glMatrixMode( GL_MODELVIEW );
LoadMenuPerspective(0); // 0 FOV = ortho
}
RageDisplay::~RageDisplay()
@@ -620,6 +606,70 @@ void RageDisplay::PopMatrix()
ASSERT(g_ModelMatrixCnt-->0);
}
void RageDisplay::LoadMenuPerspective(float fovDegrees)
{
/* fovDegrees == 0 looks the same as an ortho projection. However,
* we don't want to mess with the ModelView stack because
* EnterPerspectiveMode's preserve location feature expectes there
* not to be any camera transforms. So, do a true ortho projection
* if fovDegrees == 0. Perhaps it would be more convenient to keep
* separate model and view stacks like D3D?
*/
if( fovDegrees == 0 )
{
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
float left = 0, right = SCREEN_WIDTH, bottom = SCREEN_HEIGHT, top = 0;
if(strncmp((const char*)glGetString(GL_RENDERER),"GLDirect",strlen("GLDirect"))==0)
{
/* GLDirect incorrectly uses Direct3D's device coordinate system
* instead of OpenGL's, so we need to compensate. */
left += 0.5f;
right += 0.5f;
bottom += 0.5f;
top += 0.5f;
}
glOrtho(left, right, bottom, top, SCREEN_NEAR, SCREEN_FAR );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
}
else
{
CLAMP( fovDegrees, 0.1f, 179.9f );
float fovRadians = fovDegrees / 180.f * PI;
// tan(theta) = 320/d
float theta = fovRadians/2;
float fDistCameraFromImage = SCREEN_WIDTH/2 / tanf( theta );
/* It's the caller's responsibility to push first. */
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum(
-(SCREEN_WIDTH/2)/fDistCameraFromImage,
+(SCREEN_WIDTH/2)/fDistCameraFromImage,
+(SCREEN_HEIGHT/2)/fDistCameraFromImage,
-(SCREEN_HEIGHT/2)/fDistCameraFromImage,
1,
fDistCameraFromImage+1000
);
glMatrixMode( GL_MODELVIEW );
RageVector3 Up( 0.0f, 1.0f, 0.0f );
RageVector3 Eye( CENTER_X, CENTER_Y, fDistCameraFromImage );
RageVector3 At( CENTER_X, CENTER_Y, 0 );
glLoadIdentity();
gluLookAt(Eye.x, Eye.y, Eye.z, At.x, At.y, At.z, Up.x, Up.y, Up.z);
/* GLDirect incorrectly uses Direct3D's device coordinate system
* instead of OpenGL's, so we need to compensate. */
if(strncmp((const char*)glGetString(GL_RENDERER),"GLDirect",strlen("GLDirect"))==0)
glTranslatef( 0.5f, 0.5f, 0 );
}
}
/* Switch from orthogonal to perspective view.
*
* Tricky: we want to maintain all of the zooms, rotations and translations
@@ -655,6 +705,7 @@ void RageDisplay::EnterPerspective(float fov, bool preserve_loc, float near_clip
float aspect = SCREEN_WIDTH/(float)SCREEN_HEIGHT;
gluPerspective(fov, aspect, near_clip, far_clip);
/* Flip the Y coordinate, so positive numbers go down. */
glScalef(1, -1, 1);