GPU: add negated normal conversion functions

Saves having to negate to a temporary variable.

1 files changed, 12 insertions, 0 deletions

diff --git a/source/blender/gpu/intern/gpu_vertex_format.c b/source/blender/gpu/intern/gpu_vertex_format.c
index ca636d2e231..24f4a1a53f1 100644
--- a/source/blender/gpu/intern/gpu_vertex_format.c
+++ b/source/blender/gpu/intern/gpu_vertex_format.c
@@ -478,8 +478,20 @@ GPUPackedNormal GPU_normal_convert_i10_v3(const float data[3])
 	return n;
 }
 
+GPUPackedNormal GPU_normal_convert_i10_v3_negated(const float data[3])
+{
+	GPUPackedNormal n = { .x = quantize(-data[0]), .y = quantize(-data[1]), .z = quantize(-data[2]) };
+	return n;
+}
+
 GPUPackedNormal GPU_normal_convert_i10_s3(const short data[3])
 {
 	GPUPackedNormal n = { .x = convert_i16(data[0]), .y = convert_i16(data[1]), .z = convert_i16(data[2]) };
 	return n;
 }
+
+GPUPackedNormal GPU_normal_convert_i10_s3_negated(const short data[3])
+{
+	GPUPackedNormal n = { .x = convert_i16(-data[0]), .y = convert_i16(-data[1]), .z = convert_i16(-data[2]) };
+	return n;
+}