COMPMID-1303: CLDepthConvert : Add support for FP32 -> FP16 and FP16 -> FP32 + validate() function

Change-Id: I6808de0254a7c4bca440322cc14b795b3b32465b
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/142427
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
diff --git a/src/core/CL/cl_kernels/depth_convert.cl b/src/core/CL/cl_kernels/depth_convert.cl
index 01491ec..611449e 100644
--- a/src/core/CL/cl_kernels/depth_convert.cl
+++ b/src/core/CL/cl_kernels/depth_convert.cl
@@ -24,8 +24,13 @@
 #include "helpers.h"
 
 #ifdef SATURATE
+#if defined(IS_DATA_TYPE_FLOAT)
+#define CONVERT_RTE(x, type) (convert_##type##_rte((x)))
+#define CONVERT_DOWN(x, type) CONVERT_RTE(x, type)
+#else /* defined(IS_DATA_TYPE_FLOAT) */
 #define CONVERT_DOWN(x, type) CONVERT_SAT(x, type)
-#else /* SATURATE */
+#endif /* defined(IS_DATA_TYPE_FLOAT) */
+#else  /* SATURATE */
 #define CONVERT_DOWN(x, type) CONVERT(x, type)
 #endif /* SATURATE */
 
@@ -36,13 +41,13 @@
  * @attention The input and output data_types need to be passed at compile time using -DDATA_TYPE_IN and -DDATA_TYPE_OUT:
  * e.g. -DDATA_TYPE_IN=uchar -DDATA_TYPE_OUT=short
  *
- * @param[in]  in_ptr                            Pointer to the source image. Supported data types: U8, U16, S16, U32, S32, F16, F32
+ * @param[in]  in_ptr                            Pointer to the source image. Supported data types: U8/U16/S16/U32/S32/F16/F32
  * @param[in]  in_stride_x                       Stride of the source image in X dimension (in bytes)
  * @param[in]  in_step_x                         in_stride_x * number of elements along X processed per workitem(in bytes)
  * @param[in]  in_stride_y                       Stride of the source image in Y dimension (in bytes)
  * @param[in]  in_step_y                         in_stride_y * number of elements along Y processed per workitem(in bytes)
  * @param[in]  in_offset_first_element_in_bytes  The offset of the first element in the source image
- * @param[out] out_ptr                           Pointer to the destination image. Supported data types: U8, U16, S16, U32, S32
+ * @param[out] out_ptr                           Pointer to the destination image. Supported data types: U8/U16/S16/U32/S32/F16/F32
  * @param[in]  out_stride_x                      Stride of the destination image in X dimension (in bytes)
  * @param[in]  out_step_x                        out_stride_x * number of elements along X processed per workitem(in bytes)
  * @param[in]  out_stride_y                      Stride of the destination image in Y dimension (in bytes)
@@ -63,7 +68,12 @@
     VEC_DATA_TYPE(DATA_TYPE_IN, 16)
     in_data = vload16(0, (__global DATA_TYPE_IN *)in.ptr);
 
+#if defined(IS_DATA_TYPE_FLOAT)
+    const DATA_TYPE_IN scale = (DATA_TYPE_IN)(1 << shift);
+    vstore16(CONVERT_DOWN(in_data / scale, VEC_DATA_TYPE(DATA_TYPE_OUT, 16)), 0, (__global DATA_TYPE_OUT *)out.ptr);
+#else  /* defined(IS_DATA_TYPE_FLOAT) */
     vstore16(CONVERT_DOWN(in_data >> shift, VEC_DATA_TYPE(DATA_TYPE_OUT, 16)), 0, (__global DATA_TYPE_OUT *)out.ptr);
+#endif /* defined(IS_DATA_TYPE_FLOAT) */
 }
 
 /** This function performs a up-scaling depth conversion.
@@ -71,13 +81,13 @@
  * @attention The input and output data_types need to be passed at compile time using -DDATA_TYPE_IN and -DDATA_TYPE_OUT:
  * e.g. -DDATA_TYPE_IN=uchar -DDATA_TYPE_OUT=short
  *
- * @param[in]  in_ptr                            Pointer to the source image. Supported data types: U8, U16, S16, U32 or S32
+ * @param[in]  in_ptr                            Pointer to the source image. Supported data types: U8/U16/S16/U32/S32/F16/F32
  * @param[in]  in_stride_x                       Stride of the source image in X dimension (in bytes)
  * @param[in]  in_step_x                         in_stride_x * number of elements along X processed per workitem(in bytes)
  * @param[in]  in_stride_y                       Stride of the source image in Y dimension (in bytes)
  * @param[in]  in_step_y                         in_stride_y * number of elements along Y processed per workitem(in bytes)
  * @param[in]  in_offset_first_element_in_bytes  The offset of the first element in the source image
- * @param[out] out_ptr                           Pointer to the destination image. Supported data types: U8, U16, S16, U32, S32, F16 or F32
+ * @param[out] out_ptr                           Pointer to the destination image. Supported data types: U8/U16/S16/U32/S32/F16/F32
  * @param[in]  out_stride_x                      Stride of the destination image in X dimension (in bytes)
  * @param[in]  out_step_x                        out_stride_x * number of elements along X processed per workitem(in bytes)
  * @param[in]  out_stride_y                      Stride of the destination image in Y dimension (in bytes)
@@ -98,5 +108,10 @@
     VEC_DATA_TYPE(DATA_TYPE_IN, 16)
     in_data = vload16(0, (__global DATA_TYPE_IN *)in.ptr);
 
+#if defined(IS_DATA_TYPE_FLOAT)
+    const DATA_TYPE_OUT scale = (DATA_TYPE_OUT)(1 << shift);
+    vstore16(CONVERT_UP(in_data, VEC_DATA_TYPE(DATA_TYPE_OUT, 16)) * scale, 0, (__global DATA_TYPE_OUT *)out.ptr);
+#else  /* defined(IS_DATA_TYPE_FLOAT) */
     vstore16(CONVERT_UP(in_data, VEC_DATA_TYPE(DATA_TYPE_OUT, 16)) << shift, 0, (__global DATA_TYPE_OUT *)out.ptr);
+#endif /* defined(IS_DATA_TYPE_FLOAT) */
 }