OpenGL2: Remove half float support.

Not enough accuracy for textures larger than 1024x1024, such as merged lightmaps.

code/renderergl2/tr_local.h

@@ -1388,7 +1388,6 @@ typedef struct {
 
 	qboolean textureNonPowerOfTwo;
 	qboolean textureFloat;
-	qboolean halfFloatPixel;
 	textureCompressionRef_t textureCompression;
 	qboolean swizzleNormalmap;
 	
@@ -1398,9 +1397,6 @@ typedef struct {
 	qboolean depthClamp;
 	qboolean seamlessCubeMap;
 
-	GLenum packedTexcoordDataType;
-	int packedTexcoordDataSize;
-
 	qboolean vertexArrayObject;
 	qboolean directStateAccess;
 } glRefConfig_t;
@@ -1696,8 +1692,6 @@ extern  cvar_t  *r_ext_draw_range_elements;
 extern  cvar_t  *r_ext_multi_draw_arrays;
 extern  cvar_t  *r_ext_framebuffer_object;
 extern  cvar_t  *r_ext_texture_float;
-extern  cvar_t  *r_arb_half_float_pixel;
-extern  cvar_t  *r_arb_half_float_vertex;
 extern  cvar_t  *r_ext_framebuffer_multisample;
 extern  cvar_t  *r_arb_seamless_cube_map;
 extern  cvar_t  *r_arb_vertex_array_object;
@@ -1924,7 +1918,7 @@ qboolean	R_GetEntityToken( char *buffer, int size );
 model_t		*R_AllocModel( void );
 
 void    	R_Init( void );
-void		R_UpdateSubImage( image_t *image, byte *pic, int x, int y, int width, int height );
+void		R_UpdateSubImage( image_t *image, byte *pic, int x, int y, int width, int height, GLenum picFormat );
 
 void		R_SetColorMappings( void );
 void		R_GammaCorrect( byte *buffer, int bufSize );
@@ -2157,7 +2151,6 @@ VERTEX BUFFER OBJECTS
 
 void R_VaoPackTangent(int16_t *out, vec4_t v);
 void R_VaoPackNormal(int16_t *out, vec3_t v);
-int R_VaoPackTexCoord(byte *out, vec2_t st);
 void R_VaoPackColor(uint16_t *out, vec4_t c);
 void R_VaoUnpackTangent(vec4_t v, int16_t *pack);
 void R_VaoUnpackNormal(vec3_t v, int16_t *pack);