Mesa (master): gallium/util: added support for SRGB formats
Brian Paul
brianp at kemper.freedesktop.org
Thu Aug 27 15:15:41 UTC 2009
Module: Mesa
Branch: master
Commit: 32f95f8c173155ca30e77c345a68b0d3336ddbed
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=32f95f8c173155ca30e77c345a68b0d3336ddbed
Author: Brian Paul <brianp at vmware.com>
Date: Thu Aug 27 09:10:34 2009 -0600
gallium/util: added support for SRGB formats
Fixes glean/texture_srgb failure, bug #23449.
---
src/gallium/auxiliary/util/u_tile.c | 196 +++++++++++++++++++++++++++++++++++
1 files changed, 196 insertions(+), 0 deletions(-)
diff --git a/src/gallium/auxiliary/util/u_tile.c b/src/gallium/auxiliary/util/u_tile.c
index 422bc76..aa16fe7 100644
--- a/src/gallium/auxiliary/util/u_tile.c
+++ b/src/gallium/auxiliary/util/u_tile.c
@@ -596,6 +596,184 @@ r16g16b16a16_put_tile_rgba(short *dst,
}
+/*** PIPE_FORMAT_R8G8B8A8_SRGB ***/
+
+/**
+ * Convert an 8-bit sRGB value from non-linear space to a
+ * linear RGB value in [0, 1].
+ * Implemented with a 256-entry lookup table.
+ */
+static INLINE float
+srgb_to_linear(ubyte cs8)
+{
+ static float table[256];
+ static boolean tableReady = FALSE;
+ if (!tableReady) {
+ /* compute lookup table now */
+ uint i;
+ for (i = 0; i < 256; i++) {
+ const float cs = ubyte_to_float(i);
+ if (cs <= 0.04045) {
+ table[i] = cs / 12.92f;
+ }
+ else {
+ table[i] = (float) powf((cs + 0.055) / 1.055, 2.4);
+ }
+ }
+ tableReady = TRUE;
+ }
+ return table[cs8];
+}
+
+
+/**
+ * Convert linear float in [0,1] to an srgb ubyte value in [0,255].
+ * XXX this hasn't been tested (render to srgb surface).
+ * XXX this needs optimization.
+ */
+static INLINE ubyte
+linear_to_srgb(float cl)
+{
+ if (cl >= 1.0F)
+ return 255;
+ else if (cl >= 0.0031308F)
+ return float_to_ubyte(1.055F * powf(cl, 0.41666F) - 0.055F);
+ else if (cl > 0.0F)
+ return float_to_ubyte(12.92F * cl);
+ else
+ return 0.0;
+}
+
+
+static void
+a8r8g8b8_srgb_get_tile_rgba(const unsigned *src,
+ unsigned w, unsigned h,
+ float *p,
+ unsigned dst_stride)
+{
+ unsigned i, j;
+
+ for (i = 0; i < h; i++) {
+ float *pRow = p;
+ for (j = 0; j < w; j++, pRow += 4) {
+ const unsigned pixel = *src++;
+ pRow[0] = srgb_to_linear((pixel >> 16) & 0xff);
+ pRow[1] = srgb_to_linear((pixel >> 8) & 0xff);
+ pRow[2] = srgb_to_linear((pixel >> 0) & 0xff);
+ pRow[3] = ubyte_to_float((pixel >> 24) & 0xff);
+ }
+ p += dst_stride;
+ }
+}
+
+static void
+a8r8g8b8_srgb_put_tile_rgba(unsigned *dst,
+ unsigned w, unsigned h,
+ const float *p,
+ unsigned src_stride)
+{
+ unsigned i, j;
+
+ for (i = 0; i < h; i++) {
+ const float *pRow = p;
+ for (j = 0; j < w; j++, pRow += 4) {
+ unsigned r, g, b, a;
+ r = linear_to_srgb(pRow[0]);
+ g = linear_to_srgb(pRow[1]);
+ b = linear_to_srgb(pRow[2]);
+ a = float_to_ubyte(pRow[3]);
+ *dst++ = (a << 24) | (r << 16) | (g << 8) | b;
+ }
+ p += src_stride;
+ }
+}
+
+
+/*** PIPE_FORMAT_A8L8_SRGB ***/
+
+static void
+a8l8_srgb_get_tile_rgba(const ushort *src,
+ unsigned w, unsigned h,
+ float *p,
+ unsigned dst_stride)
+{
+ unsigned i, j;
+
+ for (i = 0; i < h; i++) {
+ float *pRow = p;
+ for (j = 0; j < w; j++, pRow += 4) {
+ ushort p = *src++;
+ pRow[0] =
+ pRow[1] =
+ pRow[2] = srgb_to_linear(p & 0xff);
+ pRow[3] = ubyte_to_float(p >> 8);
+ }
+ p += dst_stride;
+ }
+}
+
+static void
+a8l8_srgb_put_tile_rgba(ushort *dst,
+ unsigned w, unsigned h,
+ const float *p,
+ unsigned src_stride)
+{
+ unsigned i, j;
+
+ for (i = 0; i < h; i++) {
+ const float *pRow = p;
+ for (j = 0; j < w; j++, pRow += 4) {
+ unsigned r, a;
+ r = linear_to_srgb(pRow[0]);
+ a = float_to_ubyte(pRow[3]);
+ *dst++ = (a << 8) | r;
+ }
+ p += src_stride;
+ }
+}
+
+
+/*** PIPE_FORMAT_L8_SRGB ***/
+
+static void
+l8_srgb_get_tile_rgba(const ubyte *src,
+ unsigned w, unsigned h,
+ float *p,
+ unsigned dst_stride)
+{
+ unsigned i, j;
+
+ for (i = 0; i < h; i++) {
+ float *pRow = p;
+ for (j = 0; j < w; j++, src++, pRow += 4) {
+ pRow[0] =
+ pRow[1] =
+ pRow[2] = srgb_to_linear(*src);
+ pRow[3] = 1.0;
+ }
+ p += dst_stride;
+ }
+}
+
+static void
+l8_srgb_put_tile_rgba(ubyte *dst,
+ unsigned w, unsigned h,
+ const float *p,
+ unsigned src_stride)
+{
+ unsigned i, j;
+
+ for (i = 0; i < h; i++) {
+ const float *pRow = p;
+ for (j = 0; j < w; j++, pRow += 4) {
+ unsigned r;
+ r = linear_to_srgb(pRow[0]);
+ *dst++ = (ubyte) r;
+ }
+ p += src_stride;
+ }
+}
+
/*** PIPE_FORMAT_I8_UNORM ***/
@@ -946,6 +1124,15 @@ pipe_tile_raw_to_rgba(enum pipe_format format,
case PIPE_FORMAT_R16G16B16A16_SNORM:
r16g16b16a16_get_tile_rgba((short *) src, w, h, dst, dst_stride);
break;
+ case PIPE_FORMAT_A8R8G8B8_SRGB:
+ a8r8g8b8_srgb_get_tile_rgba((unsigned *) src, w, h, dst, dst_stride);
+ break;
+ case PIPE_FORMAT_A8L8_SRGB:
+ a8l8_srgb_get_tile_rgba((ushort *) src, w, h, dst, dst_stride);
+ break;
+ case PIPE_FORMAT_L8_SRGB:
+ l8_srgb_get_tile_rgba((ubyte *) src, w, h, dst, dst_stride);
+ break;
case PIPE_FORMAT_Z16_UNORM:
z16_get_tile_rgba((ushort *) src, w, h, dst, dst_stride);
break;
@@ -1059,6 +1246,15 @@ pipe_put_tile_rgba(struct pipe_transfer *pt,
case PIPE_FORMAT_R16G16B16A16_SNORM:
r16g16b16a16_put_tile_rgba((short *) packed, w, h, p, src_stride);
break;
+ case PIPE_FORMAT_A8R8G8B8_SRGB:
+ a8r8g8b8_srgb_put_tile_rgba((unsigned *) packed, w, h, p, src_stride);
+ break;
+ case PIPE_FORMAT_A8L8_SRGB:
+ a8l8_srgb_put_tile_rgba((ushort *) packed, w, h, p, src_stride);
+ break;
+ case PIPE_FORMAT_L8_SRGB:
+ l8_srgb_put_tile_rgba((ubyte *) packed, w, h, p, src_stride);
+ break;
case PIPE_FORMAT_Z16_UNORM:
/*z16_put_tile_rgba((ushort *) packed, w, h, p, src_stride);*/
break;
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