[Mesa-dev] [PATCH v2 08/13] mesa/format_utils: Add a general format conversion function
Jason Ekstrand
jason at jlekstrand.net
Sat Aug 2 13:11:27 PDT 2014
Most format conversion operations required by GL can be performed by
converting one channel at a time, shuffling the channels around, and
optionally filling missing channels with zeros and ones. This adds a
function to do just that in a general, yet efficient, way.
v2:
* Add better comments including full docs for functions
* Don't use __typeof__
* Use inline helpers instead of writing out conversions by hand,
* Force full loop unrolling for better performance
Signed-off-by: Jason Ekstrand <jason.ekstrand at intel.com>
---
src/mesa/main/format_utils.c | 844 +++++++++++++++++++++++++++++++++++++++++++
src/mesa/main/format_utils.h | 5 +
2 files changed, 849 insertions(+)
diff --git a/src/mesa/main/format_utils.c b/src/mesa/main/format_utils.c
index 241c158..d60aeb3 100644
--- a/src/mesa/main/format_utils.c
+++ b/src/mesa/main/format_utils.c
@@ -54,3 +54,847 @@ _mesa_srgb_ubyte_to_linear_float(uint8_t cl)
return lut[cl];
}
+
+/* A bunch of format conversion macros and helper functions used below */
+
+/* Only guaranteed to work for BITS <= 32 */
+#define MAX_UINT(BITS) ((BITS) == 32 ? UINT32_MAX : ((1u << (BITS)) - 1))
+#define MAX_INT(BITS) (int)MAX_UINT((BITS) - 1)
+
+/* Extends an integer of size SRC_BITS to one of size DST_BITS linearly */
+#define EXTEND_NORMALIZED_INT(X, SRC_BITS, DST_BITS) \
+ (((X) * (int)(MAX_UINT(DST_BITS) / MAX_UINT(SRC_BITS))) + \
+ ((DST_BITS % SRC_BITS) ? ((X) >> (SRC_BITS - DST_BITS % SRC_BITS)) : 0))
+
+static inline float
+unorm_to_float(unsigned x, unsigned src_bits)
+{
+ return x * (1.0f / (float)MAX_UINT(src_bits));
+}
+
+static inline float
+snorm_to_float(int x, unsigned src_bits)
+{
+ if (x == -MAX_INT(src_bits))
+ return -1.0f;
+ else
+ return x * (1.0f / (float)MAX_INT(src_bits));
+}
+
+static inline uint16_t
+unorm_to_half(unsigned x, unsigned src_bits)
+{
+ return _mesa_float_to_half(unorm_to_float(x, src_bits));
+}
+
+static inline uint16_t
+snorm_to_half(int x, unsigned src_bits)
+{
+ return _mesa_float_to_half(snorm_to_float(x, src_bits));
+}
+
+static inline unsigned
+float_to_unorm(float x, unsigned dst_bits)
+{
+ if (x < 0.0f)
+ return 0;
+ else if (x > 1.0f)
+ return MAX_UINT(dst_bits);
+ else
+ return F_TO_I(x * MAX_UINT(dst_bits));
+}
+
+static inline unsigned
+half_to_unorm(uint16_t x, unsigned dst_bits)
+{
+ return float_to_unorm(_mesa_half_to_float(x), dst_bits);
+}
+
+static inline unsigned
+unorm_to_unorm(unsigned x, unsigned src_bits, unsigned dst_bits)
+{
+ if (src_bits < dst_bits)
+ return EXTEND_NORMALIZED_INT(x, src_bits, dst_bits);
+ else
+ return x >> (src_bits - dst_bits);
+}
+
+static inline unsigned
+snorm_to_unorm(int x, unsigned src_bits, unsigned dst_bits)
+{
+ if (x < 0)
+ return 0;
+ else
+ return unorm_to_unorm(x, src_bits - 1, dst_bits);
+}
+
+static inline int
+float_to_snorm(float x, unsigned dst_bits)
+{
+ if (x < -1.0f)
+ return -MAX_INT(dst_bits);
+ else if (x > 1.0f)
+ return MAX_INT(dst_bits);
+ else
+ return F_TO_I(x * MAX_INT(dst_bits));
+}
+
+static inline int
+half_to_snorm(uint16_t x, unsigned dst_bits)
+{
+ return float_to_snorm(_mesa_half_to_float(x), dst_bits);
+}
+
+static inline int
+unorm_to_snorm(unsigned x, unsigned src_bits, unsigned dst_bits)
+{
+ return unorm_to_unorm(x, src_bits, dst_bits - 1);
+}
+
+static inline int
+snorm_to_snorm(int x, unsigned src_bits, unsigned dst_bits)
+{
+ if (x < -MAX_INT(src_bits))
+ return -MAX_INT(dst_bits);
+ else if (src_bits < dst_bits)
+ return EXTEND_NORMALIZED_INT(x, src_bits - 1, dst_bits - 1);
+ else
+ return x >> (src_bits - dst_bits);
+}
+
+static inline unsigned
+float_to_uint(float x)
+{
+ if (x < 0.0f)
+ return 0;
+ else
+ return x;
+}
+
+static inline unsigned
+half_to_uint(uint16_t x)
+{
+ if (_mesa_half_is_negative(x))
+ return 0;
+ else
+ return _mesa_float_to_half(x);
+}
+
+/**
+ * Attempts to perform the given swizzle-and-convert operation with memcpy
+ *
+ * This function determines if the given swizzle-and-convert operation can
+ * be done with a simple memcpy and, if so, does the memcpy. If not, it
+ * returns false and we fall back to the standard version below.
+ *
+ * The arguments are exactly the same as for _mesa_swizzle_and_convert
+ *
+ * \return true if it successfully performed the swizzle-and-convert
+ * operation with memcpy, false otherwise
+ */
+static bool
+swizzle_convert_try_memcpy(void *dst, GLenum dst_type, int num_dst_channels,
+ const void *src, GLenum src_type, int num_src_channels,
+ const uint8_t swizzle[4], bool normalized, int count)
+{
+ int i;
+
+ if (src_type != dst_type)
+ return false;
+ if (num_src_channels != num_dst_channels)
+ return false;
+
+ for (i = 0; i < num_dst_channels; ++i)
+ if (swizzle[i] != i && swizzle[i] != MESA_FORMAT_SWIZZLE_NONE)
+ return false;
+
+ memcpy(dst, src, count * num_src_channels * _mesa_sizeof_type(src_type));
+
+ return true;
+}
+
+/**
+ * Represents a single instance of the standard swizzle-and-convert loop
+ *
+ * Any swizzle-and-convert operation simply loops through the pixels and
+ * performs the transformation operation one pixel at a time. This macro
+ * embodies one instance of the conversion loop. This way we can do all
+ * control flow outside of the loop and allow the compiler to unroll
+ * everything inside the loop.
+ *
+ * Note: This loop is carefully crafted for performance. Be careful when
+ * changing it and run some benchmarks to ensure no performance regressions
+ * if you do.
+ *
+ * \param DST_TYPE the C datatype of the destination
+ * \param DST_CHANS the number of destination channels
+ * \param SRC_TYPE the C datatype of the source
+ * \param SRC_CHANS the number of source channels
+ * \param CONV an expression for converting from the source data,
+ * storred in the variable "src", to the destination
+ * format
+ */
+#define SWIZZLE_CONVERT_LOOP(DST_TYPE, DST_CHANS, SRC_TYPE, SRC_CHANS, CONV) \
+ for (s = 0; s < count; ++s) { \
+ for (j = 0; j < SRC_CHANS; ++j) { \
+ SRC_TYPE src = typed_src[j]; \
+ tmp[j] = CONV; \
+ } \
+ \
+ typed_dst[0] = tmp[swizzle_x]; \
+ if (DST_CHANS > 1) { \
+ typed_dst[1] = tmp[swizzle_y]; \
+ if (DST_CHANS > 2) { \
+ typed_dst[2] = tmp[swizzle_z]; \
+ if (DST_CHANS > 3) { \
+ typed_dst[3] = tmp[swizzle_w]; \
+ } \
+ } \
+ } \
+ typed_src += SRC_CHANS; \
+ typed_dst += DST_CHANS; \
+ } \
+
+/**
+ * Represents a single swizzle-and-convert operation
+ *
+ * This macro represents everything done in a single swizzle-and-convert
+ * operation. The actual work is done by the SWIZZLE_CONVERT_LOOP macro.
+ * This macro acts as a wrapper that uses a nested switch to ensure that
+ * all looping parameters get unrolled.
+ *
+ * This macro makes assumptions about variables etc. in the calling
+ * function. Changes to _mesa_swizzle_and_convert may require changes to
+ * this macro.
+ *
+ * \param DST_TYPE the C datatype of the destination
+ * \param SRC_TYPE the C datatype of the source
+ * \param CONV an expression for converting from the source data,
+ * storred in the variable "src", to the destination
+ * format
+ */
+#define SWIZZLE_CONVERT(DST_TYPE, SRC_TYPE, CONV) \
+ do { \
+ const SRC_TYPE *typed_src = void_src; \
+ DST_TYPE *typed_dst = void_dst; \
+ DST_TYPE tmp[7]; \
+ tmp[4] = 0; \
+ tmp[5] = one; \
+ switch (num_dst_channels) { \
+ case 1: \
+ switch (num_src_channels) { \
+ case 1: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 1, SRC_TYPE, 1, CONV) \
+ break; \
+ case 2: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 1, SRC_TYPE, 2, CONV) \
+ break; \
+ case 3: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 1, SRC_TYPE, 3, CONV) \
+ break; \
+ case 4: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 1, SRC_TYPE, 4, CONV) \
+ break; \
+ } \
+ break; \
+ case 2: \
+ switch (num_src_channels) { \
+ case 1: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 2, SRC_TYPE, 1, CONV) \
+ break; \
+ case 2: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 2, SRC_TYPE, 2, CONV) \
+ break; \
+ case 3: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 2, SRC_TYPE, 3, CONV) \
+ break; \
+ case 4: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 2, SRC_TYPE, 4, CONV) \
+ break; \
+ } \
+ break; \
+ case 3: \
+ switch (num_src_channels) { \
+ case 1: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 3, SRC_TYPE, 1, CONV) \
+ break; \
+ case 2: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 3, SRC_TYPE, 2, CONV) \
+ break; \
+ case 3: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 3, SRC_TYPE, 3, CONV) \
+ break; \
+ case 4: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 3, SRC_TYPE, 4, CONV) \
+ break; \
+ } \
+ break; \
+ case 4: \
+ switch (num_src_channels) { \
+ case 1: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 4, SRC_TYPE, 1, CONV) \
+ break; \
+ case 2: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 4, SRC_TYPE, 2, CONV) \
+ break; \
+ case 3: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 4, SRC_TYPE, 3, CONV) \
+ break; \
+ case 4: \
+ SWIZZLE_CONVERT_LOOP(DST_TYPE, 4, SRC_TYPE, 4, CONV) \
+ break; \
+ } \
+ break; \
+ } \
+ } while (0);
+
+/**
+ * Convert between array-based color formats.
+ *
+ * Most format conversion operations required by GL can be performed by
+ * converting one channel at a time, shuffling the channels around, and
+ * optionally filling missing channels with zeros and ones. This function
+ * does just that in a general, yet efficient, way.
+ *
+ * The swizzle parameter is an array of 4 numbers (see
+ * _mesa_get_format_swizzle) that describes where each channel in the
+ * destination should come from in the source. If swizzle[i] < 4 then it
+ * means that dst[i] = CONVERT(src[swizzle[i]]). If swizzle[i] is
+ * MESA_FORMAT_SWIZZLE_ZERO or MESA_FORMAT_SWIZZLE_ONE, the corresponding
+ * dst[i] will be filled with the appropreate representation of zero or one
+ * respectively.
+ *
+ * Under most circumstances, the source and destination images must be
+ * different as no care is taken not to clobber one with the other.
+ * However, if they have the same number of bits per pixel, it is safe to
+ * do an in-place conversion.
+ *
+ * \param[out] dst pointer to where the converted data should
+ * be stored
+ *
+ * \param[in] dst_type the destination GL type of the converted
+ * data (GL_BYTE, etc.)
+ *
+ * \param[in] num_dst_channels the number of channels in the converted
+ * data
+ *
+ * \param[in] src pointer to the source data
+ *
+ * \param[in] src_type the GL type of the source data (GL_BYTE,
+ * etc.)
+ *
+ * \param[in] num_src_channels the number of channels in the source data
+ * (the number of channels total, not just
+ * the number used)
+ *
+ * \param[in] swizzle describes how to get the destination data
+ * from the source data.
+ *
+ * \param[in] normalized for integer types, this indicates whether
+ * the data should be considered as integers
+ * or as normalized integers;
+ *
+ * \param[in] count the number of pixels to convert
+ */
+void
+_mesa_swizzle_and_convert(void *void_dst, GLenum dst_type, int num_dst_channels,
+ const void *void_src, GLenum src_type, int num_src_channels,
+ const uint8_t swizzle[4], bool normalized, int count)
+{
+ int s, j;
+ register uint8_t swizzle_x, swizzle_y, swizzle_z, swizzle_w;
+
+ if (swizzle_convert_try_memcpy(void_dst, dst_type, num_dst_channels,
+ void_src, src_type, num_src_channels,
+ swizzle, normalized, count))
+ return;
+
+ swizzle_x = swizzle[0];
+ swizzle_y = swizzle[1];
+ swizzle_z = swizzle[2];
+ swizzle_w = swizzle[3];
+
+ switch (dst_type) {
+ case GL_FLOAT:
+ {
+ const float one = 1.0f;
+ switch (src_type) {
+ case GL_FLOAT:
+ SWIZZLE_CONVERT(float, float, src)
+ break;
+ case GL_HALF_FLOAT:
+ SWIZZLE_CONVERT(float, uint16_t, _mesa_half_to_float(src))
+ break;
+ case GL_UNSIGNED_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(float, uint8_t, unorm_to_float(src, 8))
+ } else {
+ SWIZZLE_CONVERT(float, uint8_t, src)
+ }
+ break;
+ case GL_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(float, int8_t, snorm_to_float(src, 8))
+ } else {
+ SWIZZLE_CONVERT(float, int8_t, src)
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(float, uint16_t, unorm_to_float(src, 16))
+ } else {
+ SWIZZLE_CONVERT(float, uint16_t, src)
+ }
+ break;
+ case GL_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(float, int16_t, snorm_to_float(src, 16))
+ } else {
+ SWIZZLE_CONVERT(float, int16_t, src)
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(float, uint32_t, unorm_to_float(src, 32))
+ } else {
+ SWIZZLE_CONVERT(float, uint32_t, src)
+ }
+ break;
+ case GL_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(float, int32_t, snorm_to_float(src, 32))
+ } else {
+ SWIZZLE_CONVERT(float, int32_t, src)
+ }
+ break;
+ default:
+ assert(!"Invalid channel type combination");
+ }
+ }
+ break;
+ case GL_HALF_FLOAT:
+ {
+ const uint16_t one = _mesa_float_to_half(1.0f);
+ switch (src_type) {
+ case GL_FLOAT:
+ SWIZZLE_CONVERT(uint16_t, float, _mesa_float_to_half(src))
+ break;
+ case GL_HALF_FLOAT:
+ SWIZZLE_CONVERT(uint16_t, uint16_t, src)
+ break;
+ case GL_UNSIGNED_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, uint8_t, unorm_to_half(src, 8))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, uint8_t, _mesa_float_to_half(src))
+ }
+ break;
+ case GL_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, int8_t, snorm_to_half(src, 8))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, int8_t, _mesa_float_to_half(src))
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, uint16_t, unorm_to_half(src, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, uint16_t, _mesa_float_to_half(src))
+ }
+ break;
+ case GL_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, int16_t, snorm_to_half(src, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, int16_t, _mesa_float_to_half(src))
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, uint32_t, unorm_to_half(src, 32))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, uint32_t, _mesa_float_to_half(src))
+ }
+ break;
+ case GL_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, int32_t, snorm_to_half(src, 32))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, int32_t, _mesa_float_to_half(src))
+ }
+ break;
+ default:
+ assert(!"Invalid channel type combination");
+ }
+ }
+ break;
+ case GL_UNSIGNED_BYTE:
+ {
+ const uint8_t one = normalized ? UINT8_MAX : 1;
+ switch (src_type) {
+ case GL_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, float, float_to_unorm(src, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, float, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_HALF_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, uint16_t, half_to_unorm(src, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, uint16_t, half_to_uint(src))
+ }
+ break;
+ case GL_UNSIGNED_BYTE:
+ SWIZZLE_CONVERT(uint8_t, uint8_t, src)
+ break;
+ case GL_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, int8_t, snorm_to_unorm(src, 8, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, int8_t, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, uint16_t, unorm_to_unorm(src, 16, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, uint16_t, src)
+ }
+ break;
+ case GL_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, int16_t, snorm_to_unorm(src, 16, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, int16_t, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, uint32_t, unorm_to_unorm(src, 32, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, uint32_t, src)
+ }
+ break;
+ case GL_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, int32_t, snorm_to_unorm(src, 32, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, int32_t, (src < 0) ? 0 : src)
+ }
+ break;
+ default:
+ assert(!"Invalid channel type combination");
+ }
+ }
+ break;
+ case GL_BYTE:
+ {
+ const int8_t one = normalized ? INT8_MAX : 1;
+ switch (src_type) {
+ case GL_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, float, float_to_snorm(src, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, float, src)
+ }
+ break;
+ case GL_HALF_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint8_t, uint16_t, half_to_snorm(src, 8))
+ } else {
+ SWIZZLE_CONVERT(uint8_t, uint16_t, _mesa_half_to_float(src))
+ }
+ break;
+ case GL_UNSIGNED_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(int8_t, uint8_t, unorm_to_snorm(src, 8, 8))
+ } else {
+ SWIZZLE_CONVERT(int8_t, uint8_t, src)
+ }
+ break;
+ case GL_BYTE:
+ SWIZZLE_CONVERT(int8_t, int8_t, src)
+ break;
+ case GL_UNSIGNED_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int8_t, uint16_t, unorm_to_snorm(src, 16, 8))
+ } else {
+ SWIZZLE_CONVERT(int8_t, uint16_t, src)
+ }
+ break;
+ case GL_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int8_t, int16_t, snorm_to_snorm(src, 16, 8))
+ } else {
+ SWIZZLE_CONVERT(int8_t, int16_t, src)
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int8_t, uint32_t, unorm_to_snorm(src, 32, 8))
+ } else {
+ SWIZZLE_CONVERT(int8_t, uint32_t, src)
+ }
+ break;
+ case GL_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int8_t, int32_t, snorm_to_snorm(src, 32, 8))
+ } else {
+ SWIZZLE_CONVERT(int8_t, int32_t, src)
+ }
+ break;
+ default:
+ assert(!"Invalid channel type combination");
+ }
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ {
+ const uint16_t one = normalized ? UINT16_MAX : 1;
+ switch (src_type) {
+ case GL_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, float, float_to_unorm(src, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, float, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_HALF_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, uint16_t, half_to_unorm(src, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, uint16_t, half_to_uint(src))
+ }
+ break;
+ case GL_UNSIGNED_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, uint8_t, unorm_to_unorm(src, 8, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, uint8_t, src)
+ }
+ break;
+ case GL_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, int8_t, snorm_to_unorm(src, 8, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, int8_t, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ SWIZZLE_CONVERT(uint16_t, uint16_t, src)
+ break;
+ case GL_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, int16_t, snorm_to_unorm(src, 16, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, int16_t, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, uint32_t, unorm_to_unorm(src, 32, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, uint32_t, src)
+ }
+ break;
+ case GL_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, int32_t, snorm_to_unorm(src, 32, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, int32_t, (src < 0) ? 0 : src)
+ }
+ break;
+ default:
+ assert(!"Invalid channel type combination");
+ }
+ }
+ break;
+ case GL_SHORT:
+ {
+ const int16_t one = normalized ? INT16_MAX : 1;
+ switch (src_type) {
+ case GL_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, float, float_to_snorm(src, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, float, src)
+ }
+ break;
+ case GL_HALF_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint16_t, uint16_t, half_to_snorm(src, 16))
+ } else {
+ SWIZZLE_CONVERT(uint16_t, uint16_t, _mesa_half_to_float(src))
+ }
+ break;
+ case GL_UNSIGNED_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(int16_t, uint8_t, unorm_to_snorm(src, 8, 16))
+ } else {
+ SWIZZLE_CONVERT(int16_t, uint8_t, src)
+ }
+ break;
+ case GL_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(int16_t, int8_t, snorm_to_snorm(src, 8, 16))
+ } else {
+ SWIZZLE_CONVERT(int16_t, int8_t, src)
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int16_t, uint16_t, unorm_to_snorm(src, 16, 16))
+ } else {
+ SWIZZLE_CONVERT(int16_t, uint16_t, src)
+ }
+ break;
+ case GL_SHORT:
+ SWIZZLE_CONVERT(int16_t, int16_t, src)
+ break;
+ case GL_UNSIGNED_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int16_t, uint32_t, unorm_to_snorm(src, 32, 16))
+ } else {
+ SWIZZLE_CONVERT(int16_t, uint32_t, src)
+ }
+ break;
+ case GL_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int16_t, int32_t, snorm_to_snorm(src, 32, 16))
+ } else {
+ SWIZZLE_CONVERT(int16_t, int32_t, src)
+ }
+ break;
+ default:
+ assert(!"Invalid channel type combination");
+ }
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ {
+ const uint32_t one = normalized ? UINT32_MAX : 1;
+ switch (src_type) { case GL_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, float, float_to_unorm(src, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, float, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_HALF_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, uint16_t, half_to_unorm(src, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, uint16_t, half_to_uint(src))
+ }
+ break;
+ case GL_UNSIGNED_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, uint8_t, unorm_to_unorm(src, 8, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, uint8_t, src)
+ }
+ break;
+ case GL_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, int8_t, snorm_to_unorm(src, 8, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, int8_t, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, uint16_t, unorm_to_unorm(src, 16, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, uint16_t, src)
+ }
+ break;
+ case GL_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, int16_t, snorm_to_unorm(src, 16, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, int16_t, (src < 0) ? 0 : src)
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ SWIZZLE_CONVERT(uint32_t, uint32_t, src)
+ break;
+ case GL_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, int32_t, snorm_to_unorm(src, 32, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, int32_t, (src < 0) ? 0 : src)
+ }
+ break;
+ default:
+ assert(!"Invalid channel type combination");
+ }
+ }
+ break;
+ case GL_INT:
+ {
+ const int32_t one = normalized ? INT32_MAX : 1;
+ switch (src_type) {
+ case GL_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, float, float_to_snorm(src, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, float, src)
+ }
+ break;
+ case GL_HALF_FLOAT:
+ if (normalized) {
+ SWIZZLE_CONVERT(uint32_t, uint16_t, half_to_snorm(src, 32))
+ } else {
+ SWIZZLE_CONVERT(uint32_t, uint16_t, _mesa_half_to_float(src))
+ }
+ break;
+ case GL_UNSIGNED_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(int32_t, uint8_t, unorm_to_snorm(src, 8, 32))
+ } else {
+ SWIZZLE_CONVERT(int32_t, uint8_t, src)
+ }
+ break;
+ case GL_BYTE:
+ if (normalized) {
+ SWIZZLE_CONVERT(int32_t, int8_t, snorm_to_snorm(src, 8, 32))
+ } else {
+ SWIZZLE_CONVERT(int32_t, int8_t, src)
+ }
+ break;
+ case GL_UNSIGNED_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int32_t, uint16_t, unorm_to_snorm(src, 16, 32))
+ } else {
+ SWIZZLE_CONVERT(int32_t, uint16_t, src)
+ }
+ break;
+ case GL_SHORT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int32_t, int16_t, snorm_to_snorm(src, 16, 32))
+ } else {
+ SWIZZLE_CONVERT(int32_t, int16_t, src)
+ }
+ break;
+ case GL_UNSIGNED_INT:
+ if (normalized) {
+ SWIZZLE_CONVERT(int32_t, uint32_t, unorm_to_snorm(src, 32, 32))
+ } else {
+ SWIZZLE_CONVERT(int32_t, uint32_t, src)
+ }
+ break;
+ case GL_INT:
+ SWIZZLE_CONVERT(int32_t, int32_t, src)
+ break;
+ default:
+ assert(!"Invalid channel type combination");
+ }
+ }
+ break;
+ default:
+ assert(!"Invalid channel type");
+ }
+}
diff --git a/src/mesa/main/format_utils.h b/src/mesa/main/format_utils.h
index 6af3aa5..1a6d7e0 100644
--- a/src/mesa/main/format_utils.h
+++ b/src/mesa/main/format_utils.h
@@ -65,4 +65,9 @@ _mesa_srgb_to_linear(float cs)
float _mesa_srgb_ubyte_to_linear_float(uint8_t cl);
+void
+_mesa_swizzle_and_convert(void *dst, GLenum dst_type, int num_dst_channels,
+ const void *src, GLenum src_type, int num_src_channels,
+ const uint8_t swizzle[4], bool normalized, int count);
+
#endif
--
2.0.4
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