From c6a6cc191813e8343a17b028146a34f193a6ce44 Mon Sep 17 00:00:00 2001 From: Roland Scheidegger Date: Fri, 27 Mar 2009 19:39:52 +0100 Subject: mesa: add new signed rgba texture format This is a (partial) backport of the signed texture format support in OGL 3.1. Since it wasn't promoted from an existing extension roll our own. --- src/mesa/main/macros.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'src/mesa/main/macros.h') diff --git a/src/mesa/main/macros.h b/src/mesa/main/macros.h index bfd740870e..01d59dd42d 100644 --- a/src/mesa/main/macros.h +++ b/src/mesa/main/macros.h @@ -54,12 +54,20 @@ extern GLfloat _mesa_ubyte_to_float_color_tab[256]; #define FLOAT_TO_BYTE(X) ( (((GLint) (255.0F * (X))) - 1) / 2 ) +/** Convert GLbyte in [-128,127] to GLfloat in [-1.0,1.0], texture/fb data */ +#define BYTE_TO_FLOAT_TEX(B) ((B) == -128 ? -1.0 : (B) * (1.0F/127.0F)) + +/** Convert GLfloat in [-1.0,1.0] to GLbyte in [-128,127], texture/fb data */ +#define FLOAT_TO_BYTE_TEX(X) ( (GLint) (127.0F * (X)) ) + + /** Convert GLushort in [0,65535] to GLfloat in [0.0,1.0] */ #define USHORT_TO_FLOAT(S) ((GLfloat) (S) * (1.0F / 65535.0F)) /** Convert GLfloat in [0.0,1.0] to GLushort in [0, 65535] */ #define FLOAT_TO_USHORT(X) ((GLuint) ((X) * 65535.0)) + /** Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0] */ #define SHORT_TO_FLOAT(S) ((2.0F * (S) + 1.0F) * (1.0F/65535.0F)) @@ -67,6 +75,13 @@ extern GLfloat _mesa_ubyte_to_float_color_tab[256]; #define FLOAT_TO_SHORT(X) ( (((GLint) (65535.0F * (X))) - 1) / 2 ) +/** Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0], texture/fb data */ +#define SHORT_TO_FLOAT_TEX(S) ((S) == -32768 ? -1.0 : (S) * (1.0F/32767.0F)) + +/** Convert GLfloat in [-1.0,1.0] to GLshort in [-32768,32767], texture/fb data */ +#define FLOAT_TO_SHORT_TEX(X) ( (GLint) (32767.0F * (X)) ) + + /** Convert GLuint in [0,4294967295] to GLfloat in [0.0,1.0] */ #define UINT_TO_FLOAT(U) ((GLfloat) (U) * (1.0F / 4294967295.0F)) @@ -85,6 +100,13 @@ extern GLfloat _mesa_ubyte_to_float_color_tab[256]; #define FLOAT_TO_INT(X) ( (GLint) (2147483647.0 * (X)) ) +/** Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0], texture/fb data */ +#define INT_TO_FLOAT_TEX(I) ((I) == -2147483648 ? -1.0 : (I) * (1.0F/2147483647.0)) + +/** Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647], texture/fb data */ +#define FLOAT_TO_INT_TEX(X) ( (GLint) (2147483647.0F * (X)) ) + + #define BYTE_TO_UBYTE(b) ((GLubyte) ((b) < 0 ? 0 : (GLubyte) (b))) #define SHORT_TO_UBYTE(s) ((GLubyte) ((s) < 0 ? 0 : (GLubyte) ((s) >> 7))) #define USHORT_TO_UBYTE(s) ((GLubyte) ((s) >> 8)) -- cgit v1.2.3