MfxExamples/ArrayEffect.hpp at main · eliemichel/MfxExamples · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
#include <OpenMfx/Sdk/Cpp/Plugin/MfxEffect>

/**
 * The Array effect repeats its input geometry several times,
 * applying a transform between each copy.
 */
class ArrayEffect : public MfxEffect {
public:
	const char* GetName() override {
		return "Array";
	}
protected:
	OfxStatus Describe(OfxMeshEffectHandle) override {
		AddInput(kOfxMeshMainInput)
		.RequestCornerAttribute(
			"uv0",
			2, MfxAttributeType::Float,
			MfxAttributeSemantic::TextureCoordinate,
			false /* not mandatory */
		);

		AddInput(kOfxMeshMainOutput);

		// Number of copies
		AddParam("count", 2)
		.Label("Count")
		.Range(0, 2147483647);

		// Translation added at each copy
		AddParam("translation", double3{0.0, 0.0, 0.0})
		.Label("Translation")
		.Range(double3{-10.0, -10.0, -10.0}, double3{10.0, 10.0, 10.0});
		AddParam("offset_uv", false)
		.Label("Offset UVs");

		return kOfxStatOK;
	}

	OfxStatus Cook(OfxMeshEffectHandle) override {
		MfxMesh input_mesh = GetInput(kOfxMeshMainInput).GetMesh();
		MfxMeshProps input_props;
		input_mesh.FetchProperties(input_props);

		int count = GetParam<int>("count").GetValue();
		auto translation = to_float3(GetParam<double3>("translation").GetValue());
		bool offset_uv = GetParam<bool>("offset_uv").GetValue();

		MfxAttributeProps input_uv;
		if (offset_uv && input_mesh.HasCornerAttribute("uv0")) {
			input_mesh.GetCornerAttribute("uv0").FetchProperties(input_uv);
			if (input_uv.componentCount < 2 || input_uv.type != MfxAttributeType::Float) {
				offset_uv = false; // incompatible type, so we deactivate this feature
			}
		} else {
			offset_uv = false; // no uv available, so here again we deactivate this feature
		}

		MfxMesh output_mesh = GetInput(kOfxMeshMainOutput).GetMesh();

		if (offset_uv) {
			output_mesh.AddCornerAttribute(
				"uv0",
				2, MfxAttributeType::Float,
				MfxAttributeSemantic::TextureCoordinate
			);
		}


		output_mesh.Allocate(
			input_props.pointCount * count,
			input_props.cornerCount * count,
			input_props.faceCount * count,
			input_props.noLooseEdge,
			input_props.constantFaceSize);

		MfxAttributeProps input_positions, input_corner_points, input_face_size;
		input_mesh.GetPointAttribute(kOfxMeshAttribPointPosition).FetchProperties(input_positions);
		input_mesh.GetCornerAttribute(kOfxMeshAttribCornerPoint).FetchProperties(input_corner_points);
		input_mesh.GetFaceAttribute(kOfxMeshAttribFaceSize).FetchProperties(input_face_size);

		MfxAttributeProps output_positions, output_corner_points, output_face_counts;
		output_mesh.GetPointAttribute(kOfxMeshAttribPointPosition).FetchProperties(output_positions);
		output_mesh.GetCornerAttribute(kOfxMeshAttribCornerPoint).FetchProperties(output_corner_points);
		output_mesh.GetFaceAttribute(kOfxMeshAttribFaceSize).FetchProperties(output_face_counts);
		for (int k = 0 ; k < count ; ++k) {
			for (int i = 0 ; i < input_props.pointCount ; ++i) {
				int j = i + k * input_props.pointCount;
				float *in_p = reinterpret_cast<float*>(input_positions.data + i * input_positions.stride);
				float *out_p = reinterpret_cast<float*>(output_positions.data + j * output_positions.stride);
				out_p[0] = in_p[0] + translation[0] * k;
				out_p[1] = in_p[1] + translation[1] * k;
				out_p[2] = in_p[2] + translation[2] * k;
			}

			for (int i = 0 ; i < input_props.cornerCount ; ++i) {
				int j = i + k * input_props.cornerCount;
				int *in_p = reinterpret_cast<int*>(input_corner_points.data + i * input_corner_points.stride);
				int *out_p = reinterpret_cast<int*>(output_corner_points.data + j * output_corner_points.stride);
				out_p[0] = in_p[0] + k * input_props.pointCount;
			}

			if (input_props.constantFaceSize < 0) {
				for (int i = 0 ; i < input_props.faceCount ; ++i) {
					int j = i + k * input_props.faceCount;
					int *in_p = reinterpret_cast<int*>(input_face_size.data + i * input_face_size.stride);
					int *out_p = reinterpret_cast<int*>(output_face_counts.data + j * output_face_counts.stride);
					out_p[0] = in_p[0];
				}

			}
		}
		if (offset_uv) {
			MfxAttributeProps output_uv;
			output_mesh.GetCornerAttribute("uv0").FetchProperties(output_uv);

			for (int k = 0 ; k < count ; ++k) {
				for (int i = 0 ; i < input_props.cornerCount ; ++i) {
					int j = i + k * input_props.cornerCount;
					float *in_p = reinterpret_cast<float*>(input_uv.data + i * input_uv.stride);
					float *out_p = reinterpret_cast<float*>(output_uv.data + j * output_uv.stride);
					out_p[0] = in_p[0] + k;
					out_p[1] = in_p[1];
				}

			}
		}


		output_mesh.Release();
		input_mesh.Release();
		return kOfxStatOK;

	}
};