force backgrond images to power of 2

git-svn-id: https://svn.code.sf.net/p/speed-dreams/code/trunk@1943 30fe4595-0a0c-4342-8851-515496e4dcbd

Former-commit-id: f0231441216b74521a7d7e64221e7fec10547f7a
Former-commit-id: dd20c660149fec47e5787e855120fa300a27fce1

src/libs/tgfclient/gui.cpp

@@ -203,6 +203,7 @@ GfuiDisplay(void)
 		glColor3f(GfuiColor[GFUI_BASECOLORBGIMAGE][0],GfuiColor[GFUI_BASECOLORBGIMAGE][1],GfuiColor[GFUI_BASECOLORBGIMAGE][2]);
 		glBindTexture(GL_TEXTURE_2D, GfuiScreen->bgImage);
 		glBegin(GL_QUADS);
+
 		glTexCoord2f(tx1, ty1); glVertex3f(0.0, 0.0, 0.0);
 		glTexCoord2f(tx1, ty2); glVertex3f(0.0, GfuiScreen->height, 0.0);
 		glTexCoord2f(tx2, ty2); glVertex3f(GfuiScreen->width, GfuiScreen->height, 0.0);
@@ -997,12 +998,10 @@ GfuiScreenAddBgImg(void *scr, const char *filename)
 		return;
 	}
 
-	glGenTextures(1, &screen->bgImage);
+	//Force Background image to power of 2
-	glBindTexture(GL_TEXTURE_2D, screen->bgImage);
+	GfScaleImagePowerof2((unsigned char*)tex,w,h,GL_RGBA,screen->bgImage);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *)(tex));
 	free(tex);
+
 	GfParmReleaseHandle(handle);
 }
 

src/libs/tgfclient/img.cpp

@@ -36,11 +36,81 @@
 #ifdef WIN32
 #include <direct.h>
 #endif
+#include "GL/Glu.h"
 
 static char buf[1024];
 
 #define PNG_BYTES_TO_CHECK 4
 
+
+
+unsigned char * 
+GfScaleImage(unsigned char *pSrcImg,int srcW,int srcH,int destW,int destH,GLenum format)
+{
+	unsigned char *pData = NULL;
+	gluScaleImage(format, srcW,srcH,GL_BYTE,pSrcImg,destW,destH,GL_BYTE,pData);
+
+	return pData;
+}
+
+int GetClosestPowerof2(int Size)
+{
+	int sizes[8] = {2,4,16,128,256,512,1024,2048 };
+
+	for (int i=0;i<8;i++)
+	{
+		if (Size<=sizes[i])
+			return sizes[i];
+	}
+
+	//Do not allow textures larger then this for memory usage reasons
+	return 2048;
+}
+
+void
+GfScaleImagePowerof2(unsigned char *pSrcImg,int srcW,int srcH,GLenum format,GLuint &texId)
+{
+	int destH = 128;
+	int destW = 128;
+
+	destH = GetClosestPowerof2(srcH);
+	destW = GetClosestPowerof2(srcW);
+
+	if ((destH!=srcH)||(destW!=srcW))
+	{
+	
+		unsigned char *texData = NULL;
+		if (format == GL_RGB)
+		{
+			texData = new unsigned char[destW*destH*3];
+		}
+		else if(format == GL_RGBA)
+		{
+			texData = new unsigned char[destW*destH*4];
+
+		}
+
+		int r = gluScaleImage( format, srcW,srcH,GL_UNSIGNED_BYTE,(void*)pSrcImg,destW,destH,GL_UNSIGNED_BYTE,(void*)texData);
+		if (r!=0)
+			printf("Error trying to scale image\n");
+
+		glGenTextures(1, &texId);
+		glBindTexture(GL_TEXTURE_2D, texId);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		glTexImage2D(GL_TEXTURE_2D, 0,  GL_RGBA, destW, destH, 0, format, GL_UNSIGNED_BYTE, (GLvoid *)(texData));
+		delete [] texData;
+	}
+	else
+	{
+		glGenTextures(1, &texId);
+		glBindTexture(GL_TEXTURE_2D, texId);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		glTexImage2D(GL_TEXTURE_2D, 0, format, destW, destH, 0, format, GL_UNSIGNED_BYTE, (GLvoid *)(pSrcImg));
+	}
+}
+
 /** Load an image from disk to a buffer in RGBA mode.
     @ingroup	img		
     @param	filename	name of the image to load

src/libs/tgfclient/tgfclient.h

@@ -49,6 +49,7 @@ extern int GfImgWritePng(unsigned char *img, const char *filename, int width, in
 extern void GfImgFreeTex(GLuint tex);
 extern GLuint GfImgReadTex(const char *filename);
 extern GLuint GfImgReadTex(const char *filename,int &height,int &width);
+extern void GfScaleImagePowerof2(unsigned char *pSrcImg,int srcW,int srcH,GLenum format,GLuint &texId);
 
 extern void GfScrInit(int argc, char *argv[]);
 extern void GfScrShutdown(void);