BGE Dome: Truncated Dome are back (Upright and Downright) + GLEW_EXT_framebuffer_object check before generating FBO

After last commit (20099) warping meshes got slower (more quality == less performance). Since we don't need an extra warping for truncated domes, It's better to handle them directly in openGL without the need of warping it.

I'll talk with some Dome owners to see if we need both Upright and Downright modes. I may remove one of them by 2.49 them.

*) also: a proper GLEW_EXT_framebuffer_object check before generating FBO (for warping meshes).

**) next in line (maybe after RC2): tilt option to tilt the camera up to 90º upward.

2 files changed, 61 insertions, 21 deletions

diff --git a/source/gameengine/Ketsji/KX_Dome.cpp b/source/gameengine/Ketsji/KX_Dome.cpp
index 4a6575ff412..a302bf98cb8 100644
--- a/source/gameengine/Ketsji/KX_Dome.cpp
+++ b/source/gameengine/Ketsji/KX_Dome.cpp
@@ -124,6 +124,16 @@ KX_Dome::KX_Dome (
 			CreateMeshPanorama();
 			m_numfaces = 6;
 			break;
+		default: //DOME_TRUNCATED_DOWN and DOME_TRUNCATED_UP
+			cubetop.resize(1);
+			cubebottom.resize(1);
+			cubeleft.resize(2);
+			cuberight.resize(2);
+
+			m_angle = 180;
+			CreateMeshDome180();
+			m_numfaces = 4;
+			break;
 	}
 
 	m_numimages =(warp.usemesh?m_numfaces+1:m_numfaces);
@@ -255,7 +265,7 @@ http://projects.blender.org/tracker/?func=detail&aid=18655&group_id=9&atid=125
 bool KX_Dome::CreateDL(){
 	dlistId = glGenLists((GLsizei) m_numimages);
 	if (dlistId != 0) {
-		if(m_mode == DOME_FISHEYE){
+		if(m_mode == DOME_FISHEYE || m_mode == DOME_TRUNCATED_UP || m_mode == DOME_TRUNCATED_DOWN){
 			glNewList(dlistId, GL_COMPILE);
 				GLDrawTriangles(cubetop, nfacestop);
 			glEndList();
@@ -329,6 +339,12 @@ bool KX_Dome::CreateDL(){
 
 bool KX_Dome::CreateFBO(void)
 {
+	if (!GLEW_EXT_framebuffer_object)
+	{
+		printf("Dome Error: FrameBuffer unsupported. Using low resolution warp image.");
+		return false;
+	}
+
 	glGenFramebuffersEXT(1, &warp.fboId);
 	if(warp.fboId==0)
 	{
@@ -345,7 +361,7 @@ bool KX_Dome::CreateFBO(void)
 
 	if(status == GL_FRAMEBUFFER_UNSUPPORTED_EXT)
 	{
-		printf("Dome Error: FrameBuffer unsupported. Using low resolution warp image.");
+		printf("Dome Error: FrameBuffer settings unsupported. Using low resolution warp image.");
 		return false;
 	}
 	else if(status != GL_FRAMEBUFFER_COMPLETE_EXT)
@@ -1469,7 +1485,9 @@ Uses 6 cameras for angles up to 360º
 	MT_Scalar c = cos(deg45);
 	MT_Scalar s = sin(deg45);
 
-	if ((m_mode == DOME_FISHEYE && m_angle <= 180)){
+	if ((m_mode == DOME_FISHEYE && m_angle <= 180)
+		|| m_mode == DOME_TRUNCATED_UP 
+		|| m_mode == DOME_TRUNCATED_DOWN){
 
 		m_locRot[0] = MT_Matrix3x3( // 90º - Top
 						c, -s, 0.0,
@@ -1597,6 +1615,12 @@ void KX_Dome::Draw(void)
 		case DOME_PANORAM_SPH:
 			DrawPanorama();
 			break;
+		case DOME_TRUNCATED_UP:
+			DrawDomeFisheye();
+			break;
+		case DOME_TRUNCATED_DOWN:
+			DrawDomeFisheye();
+			break;
 	}
 
 	if(warp.usemesh)
@@ -1760,22 +1784,37 @@ void KX_Dome::DrawDomeFisheye(void)
 
 	float ortho_width, ortho_height;
 
-	if (warp.usemesh)
-		glOrtho((-1.0), 1.0, (-1.0), 1.0, -20.0, 10.0); //stretch the image to reduce resolution lost
-
-	else {
-		if (can_width < can_height){
-			ortho_width = 1.0;
-			ortho_height = (float)can_height/can_width;
-		}else{
-			ortho_width = (float)can_width/can_height;
-			ortho_height = 1.0;
+	if(m_mode == DOME_FISHEYE) {
+		if (warp.usemesh)
+			glOrtho((-1.0), 1.0, (-1.0), 1.0, -20.0, 10.0); //stretch the image to reduce resolution lost
+
+		else {
+			if (can_width < can_height){
+				ortho_width = 1.0;
+				ortho_height = (float)can_height/can_width;
+			}else{
+				ortho_width = (float)can_width/can_height;
+				ortho_height = 1.0;
+			}
+			
+			ortho_width /= m_size;
+			ortho_height /= m_size;
+			
+			glOrtho((-ortho_width), ortho_width, (-ortho_height), ortho_height, -20.0, 10.0);
 		}
-		
-		ortho_width /= m_size;
-		ortho_height /= m_size;
-		
-		glOrtho((-ortho_width), ortho_width, (-ortho_height), ortho_height, -20.0, 10.0);
+	}
+	else if(m_mode == DOME_TRUNCATED_UP)
+	{
+		ortho_width = 1.0;
+		ortho_height = 2 * ((float)can_height/can_width) - 1.0 ;
+
+		glOrtho((-ortho_width), ortho_width, (-ortho_height), ortho_width, -20.0, 10.0);
+	}
+	else { //m_mode == DOME_TRUNCATED_DOWN
+		ortho_width = 1.0;
+		ortho_height = 2 * ((float)can_height/can_width) - 1.0 ;
+
+		glOrtho((-ortho_width), ortho_width, (-ortho_width), ortho_height, -20.0, 10.0);
 	}
 
 	glMatrixMode(GL_TEXTURE);
diff --git a/source/gameengine/Ketsji/KX_Dome.h b/source/gameengine/Ketsji/KX_Dome.h
index 257172ac215..30d02dce7a0 100644
--- a/source/gameengine/Ketsji/KX_Dome.h
+++ b/source/gameengine/Ketsji/KX_Dome.h
@@ -38,13 +38,14 @@ Developed as part of a Research and Development project for SAT - La Société des
 
 #include "MEM_guardedalloc.h"
 #include "BKE_text.h"
-//#include "BLI_blenlib.h"
 
 //Dome modes: limit hardcoded in buttons_scene.c
 #define DOME_FISHEYE		1
 #define DOME_ENVMAP			2
 #define DOME_PANORAM_SPH	3
-#define DOME_NUM_MODES		4
+#define DOME_TRUNCATED_UP	4
+#define DOME_TRUNCATED_DOWN	5
+#define DOME_NUM_MODES		6
 
 
 /// class for render 3d scene
@@ -118,7 +119,7 @@ public:
 	void CalculateFrustum(KX_Camera* cam);
 	void RotateCamera(KX_Camera* cam, int i);
 
-	//Mesh  Creating Functions
+	//Mesh creation Functions
 	void CreateMeshDome180(void);
 	void CreateMeshDome250(void);
 	void CreateMeshPanorama(void);