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-rw-r--r--src/mesa/main/pack.c214
-rw-r--r--src/mesa/main/pack.h10
2 files changed, 224 insertions, 0 deletions
diff --git a/src/mesa/main/pack.c b/src/mesa/main/pack.c
index de6ab2717cb..140ba29e4fa 100644
--- a/src/mesa/main/pack.c
+++ b/src/mesa/main/pack.c
@@ -4334,4 +4334,218 @@ _mesa_rebase_rgba_uint(GLuint n, GLuint rgba[][4], GLenum baseFormat)
}
}
+void
+_mesa_pack_luminance_from_rgba_float(GLuint n, GLfloat rgba[][4],
+ GLvoid *dstAddr, GLenum dst_format,
+ GLbitfield transferOps)
+{
+ int i;
+ GLfloat *dst = (GLfloat *) dstAddr;
+
+ switch (dst_format) {
+ case GL_LUMINANCE:
+ if (transferOps & IMAGE_CLAMP_BIT) {
+ for (i = 0; i < n; i++) {
+ GLfloat sum = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ dst[i] = CLAMP(sum, 0.0F, 1.0F);
+ }
+ } else {
+ for (i = 0; i < n; i++) {
+ dst[i] = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ }
+ }
+ return;
+ case GL_LUMINANCE_ALPHA:
+ if (transferOps & IMAGE_CLAMP_BIT) {
+ for (i = 0; i < n; i++) {
+ GLfloat sum = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ dst[2*i] = CLAMP(sum, 0.0F, 1.0F);
+ dst[2*i+1] = rgba[i][ACOMP];
+ }
+ } else {
+ for (i = 0; i < n; i++) {
+ dst[2*i] = rgba[i][RCOMP] + rgba[i][GCOMP] + rgba[i][BCOMP];
+ dst[2*i+1] = rgba[i][ACOMP];
+ }
+ }
+ return;
+ default:
+ assert(!"Unsupported format");
+ }
+}
+
+static int32_t
+clamp_sint64_to_sint32(int64_t src)
+{
+ return CLAMP(src, INT32_MIN, INT32_MAX);
+}
+
+static int32_t
+clamp_sint64_to_uint32(int64_t src)
+{
+ return CLAMP(src, 0, UINT32_MAX);
+}
+
+static int32_t
+clamp_uint64_to_uint32(uint64_t src)
+{
+ return MIN2(src, UINT32_MAX);
+}
+
+static int32_t
+clamp_uint64_to_sint32(uint64_t src)
+{
+ return MIN2(src, INT32_MAX);
+}
+
+static int32_t
+convert_integer_luminance64(int64_t src64, int bits,
+ bool dst_is_signed, bool src_is_signed)
+{
+ int32_t src32;
+
+ /* Clamp Luminance value from 64-bit to 32-bit. Consider if we need
+ * any signed<->unsigned conversion too.
+ */
+ if (src_is_signed && dst_is_signed)
+ src32 = clamp_sint64_to_sint32(src64);
+ else if (src_is_signed && !dst_is_signed)
+ src32 = clamp_sint64_to_uint32(src64);
+ else if (!src_is_signed && dst_is_signed)
+ src32 = clamp_uint64_to_sint32(src64);
+ else
+ src32 = clamp_uint64_to_uint32(src64);
+
+ /* If the dst type is < 32-bit, we need an extra clamp */
+ if (bits == 32) {
+ return src32;
+ } else {
+ if (dst_is_signed)
+ return _mesa_signed_to_signed(src32, bits);
+ else
+ return _mesa_unsigned_to_unsigned(src32, bits);
+ }
+}
+
+static int32_t
+convert_integer(int32_t src, int bits, bool dst_is_signed, bool src_is_signed)
+{
+ if (src_is_signed && dst_is_signed)
+ return _mesa_signed_to_signed(src, bits);
+ else if (src_is_signed && !dst_is_signed)
+ return _mesa_signed_to_unsigned(src, bits);
+ else if (!src_is_signed && dst_is_signed)
+ return _mesa_unsigned_to_signed(src, bits);
+ else
+ return _mesa_unsigned_to_unsigned(src, bits);
+}
+
+void
+_mesa_pack_luminance_from_rgba_integer(GLuint n,
+ GLuint rgba[][4], bool rgba_is_signed,
+ GLvoid *dstAddr,
+ GLenum dst_format,
+ GLenum dst_type)
+{
+ assert(dst_format == GL_LUMINANCE_INTEGER_EXT ||
+ dst_format == GL_LUMINANCE_ALPHA_INTEGER_EXT);
+
+ int i;
+ int64_t lum64;
+ int32_t lum32, alpha;
+ bool dst_is_signed;
+ int dst_bits;
+
+ /* We first compute luminance values as a 64-bit addition of the
+ * 32-bit R,G,B components, then we clamp the result to the dst type size.
+ *
+ * Notice that this operation involves casting the 32-bit R,G,B components
+ * to 64-bit before the addition. Since rgba is defined as a GLuint array
+ * we need to be careful when rgba packs signed data and make sure
+ * that we cast to a 32-bit signed integer values before casting them to
+ * 64-bit signed integers.
+ */
+ dst_is_signed = (dst_type == GL_BYTE || dst_type == GL_SHORT ||
+ dst_type == GL_INT);
+
+ dst_bits = _mesa_sizeof_type(dst_type) * 8;
+ assert(dst_bits > 0);
+
+ switch (dst_format) {
+ case GL_LUMINANCE_INTEGER_EXT:
+ for (i = 0; i < n; i++) {
+ if (!rgba_is_signed) {
+ lum64 = (uint64_t) rgba[i][RCOMP] +
+ (uint64_t) rgba[i][GCOMP] +
+ (uint64_t) rgba[i][BCOMP];
+ } else {
+ lum64 = (int64_t) ((int32_t) rgba[i][RCOMP]) +
+ (int64_t) ((int32_t) rgba[i][GCOMP]) +
+ (int64_t) ((int32_t) rgba[i][BCOMP]);
+ }
+ lum32 = convert_integer_luminance64(lum64, dst_bits,
+ dst_is_signed, rgba_is_signed);
+ switch (dst_type) {
+ case GL_BYTE:
+ case GL_UNSIGNED_BYTE: {
+ GLbyte *dst = (GLbyte *) dstAddr;
+ dst[i] = lum32;
+ }
+ break;
+ case GL_SHORT:
+ case GL_UNSIGNED_SHORT: {
+ GLshort *dst = (GLshort *) dstAddr;
+ dst[i] = lum32;
+ }
+ break;
+ case GL_INT:
+ case GL_UNSIGNED_INT: {
+ GLint *dst = (GLint *) dstAddr;
+ dst[i] = lum32;
+ }
+ break;
+ }
+ }
+ return;
+ case GL_LUMINANCE_ALPHA_INTEGER_EXT:
+ for (i = 0; i < n; i++) {
+ if (!rgba_is_signed) {
+ lum64 = (uint64_t) rgba[i][RCOMP] +
+ (uint64_t) rgba[i][GCOMP] +
+ (uint64_t) rgba[i][BCOMP];
+ } else {
+ lum64 = (int64_t) ((int32_t) rgba[i][RCOMP]) +
+ (int64_t) ((int32_t) rgba[i][GCOMP]) +
+ (int64_t) ((int32_t) rgba[i][BCOMP]);
+ }
+ lum32 = convert_integer_luminance64(lum64, dst_bits,
+ dst_is_signed, rgba_is_signed);
+ alpha = convert_integer(rgba[i][ACOMP], dst_bits,
+ dst_is_signed, rgba_is_signed);
+ switch (dst_type) {
+ case GL_BYTE:
+ case GL_UNSIGNED_BYTE: {
+ GLbyte *dst = (GLbyte *) dstAddr;
+ dst[2*i] = lum32;
+ dst[2*i+1] = alpha;
+ }
+ case GL_SHORT:
+ case GL_UNSIGNED_SHORT: {
+ GLshort *dst = (GLshort *) dstAddr;
+ dst[i] = lum32;
+ dst[2*i+1] = alpha;
+ }
+ break;
+ case GL_INT:
+ case GL_UNSIGNED_INT: {
+ GLint *dst = (GLint *) dstAddr;
+ dst[i] = lum32;
+ dst[2*i+1] = alpha;
+ }
+ break;
+ }
+ }
+ return;
+ }
+}
diff --git a/src/mesa/main/pack.h b/src/mesa/main/pack.h
index 2173b652e75..9988bea4fd1 100644
--- a/src/mesa/main/pack.h
+++ b/src/mesa/main/pack.h
@@ -155,4 +155,14 @@ _mesa_rebase_rgba_float(GLuint n, GLfloat rgba[][4], GLenum baseFormat);
extern void
_mesa_rebase_rgba_uint(GLuint n, GLuint rgba[][4], GLenum baseFormat);
+extern void
+_mesa_pack_luminance_from_rgba_float(GLuint n, GLfloat rgba[][4],
+ GLvoid *dstAddr, GLenum dst_format,
+ GLbitfield transferOps);
+
+extern void
+_mesa_pack_luminance_from_rgba_integer(GLuint n, GLuint rgba[][4], bool rgba_is_signed,
+ GLvoid *dstAddr, GLenum dst_format,
+ GLenum dst_type);
+
#endif
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