diff options
Diffstat (limited to 'src/mesa/main')
-rw-r--r-- | src/mesa/main/pack.c | 214 | ||||
-rw-r--r-- | src/mesa/main/pack.h | 10 |
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 |