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39 | |
40 | #include "qsgvertexcolormaterial.h" |
41 | #if QT_CONFIG(opengl) |
42 | # include <qopenglshaderprogram.h> |
43 | #endif |
44 | QT_BEGIN_NAMESPACE |
45 | |
46 | class QSGVertexColorMaterialShader : public QSGMaterialShader |
47 | { |
48 | public: |
49 | QSGVertexColorMaterialShader(); |
50 | |
51 | void updateState(const RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect) override; |
52 | char const *const *attributeNames() const override; |
53 | |
54 | private: |
55 | void initialize() override; |
56 | #if QT_CONFIG(opengl) |
57 | int m_matrix_id; |
58 | int m_opacity_id; |
59 | #endif |
60 | }; |
61 | |
62 | QSGVertexColorMaterialShader::QSGVertexColorMaterialShader() |
63 | { |
64 | #if QT_CONFIG(opengl) |
65 | setShaderSourceFile(type: QOpenGLShader::Vertex, QStringLiteral(":/qt-project.org/scenegraph/shaders/vertexcolor.vert" )); |
66 | setShaderSourceFile(type: QOpenGLShader::Fragment, QStringLiteral(":/qt-project.org/scenegraph/shaders/vertexcolor.frag" )); |
67 | #endif |
68 | } |
69 | |
70 | void QSGVertexColorMaterialShader::updateState(const RenderState &state, QSGMaterial * /*newEffect*/, QSGMaterial *) |
71 | { |
72 | #if QT_CONFIG(opengl) |
73 | if (state.isOpacityDirty()) |
74 | program()->setUniformValue(location: m_opacity_id, value: state.opacity()); |
75 | |
76 | if (state.isMatrixDirty()) |
77 | program()->setUniformValue(location: m_matrix_id, value: state.combinedMatrix()); |
78 | #else |
79 | Q_UNUSED(state) |
80 | #endif |
81 | } |
82 | |
83 | char const *const *QSGVertexColorMaterialShader::attributeNames() const |
84 | { |
85 | static const char *const attr[] = { "vertexCoord" , "vertexColor" , nullptr }; |
86 | return attr; |
87 | } |
88 | |
89 | void QSGVertexColorMaterialShader::initialize() |
90 | { |
91 | #if QT_CONFIG(opengl) |
92 | m_matrix_id = program()->uniformLocation(name: "matrix" ); |
93 | m_opacity_id = program()->uniformLocation(name: "opacity" ); |
94 | #endif |
95 | } |
96 | |
97 | |
98 | class QSGVertexColorMaterialRhiShader : public QSGMaterialRhiShader |
99 | { |
100 | public: |
101 | QSGVertexColorMaterialRhiShader(); |
102 | |
103 | bool updateUniformData(RenderState &state, QSGMaterial *newEffect, QSGMaterial *oldEffect) override; |
104 | }; |
105 | |
106 | QSGVertexColorMaterialRhiShader::QSGVertexColorMaterialRhiShader() |
107 | { |
108 | setShaderFileName(stage: VertexStage, QStringLiteral(":/qt-project.org/scenegraph/shaders_ng/vertexcolor.vert.qsb" )); |
109 | setShaderFileName(stage: FragmentStage, QStringLiteral(":/qt-project.org/scenegraph/shaders_ng/vertexcolor.frag.qsb" )); |
110 | } |
111 | |
112 | bool QSGVertexColorMaterialRhiShader::updateUniformData(RenderState &state, |
113 | QSGMaterial * /*newEffect*/, |
114 | QSGMaterial * /*oldEffect*/) |
115 | { |
116 | bool changed = false; |
117 | QByteArray *buf = state.uniformData(); |
118 | |
119 | if (state.isMatrixDirty()) { |
120 | const QMatrix4x4 m = state.combinedMatrix(); |
121 | memcpy(dest: buf->data(), src: m.constData(), n: 64); |
122 | changed = true; |
123 | } |
124 | |
125 | if (state.isOpacityDirty()) { |
126 | const float opacity = state.opacity(); |
127 | memcpy(dest: buf->data() + 64, src: &opacity, n: 4); |
128 | changed = true; |
129 | } |
130 | |
131 | return changed; |
132 | } |
133 | |
134 | |
135 | /*! |
136 | \class QSGVertexColorMaterial |
137 | \brief The QSGVertexColorMaterial class provides a convenient way of rendering per-vertex |
138 | colored geometry in the scene graph. |
139 | |
140 | \inmodule QtQuick |
141 | \ingroup qtquick-scenegraph-materials |
142 | |
143 | \warning This utility class is only functional when running with the |
144 | default backend of the Qt Quick scenegraph. |
145 | |
146 | The vertex color material will give each vertex in a geometry a color. Pixels between |
147 | vertices will be linearly interpolated. The colors can contain transparency. |
148 | |
149 | The geometry to be rendered with vertex color must have the following layout. Attribute |
150 | position 0 must contain vertices. Attribute position 1 must contain colors, a tuple of |
151 | 4 values with RGBA layout. Both floats in the range of 0 to 1 and unsigned bytes in |
152 | the range 0 to 255 are valid for the color values. |
153 | |
154 | \note The rendering pipeline expects pixels with premultiplied alpha. |
155 | |
156 | QSGGeometry::defaultAttributes_ColoredPoint2D() can be used to construct an attribute |
157 | set that is compatible with this material. |
158 | |
159 | The vertex color material respects both current opacity and current matrix when |
160 | updating it's rendering state. |
161 | */ |
162 | |
163 | |
164 | /*! |
165 | Creates a new vertex color material. |
166 | */ |
167 | |
168 | QSGVertexColorMaterial::QSGVertexColorMaterial() |
169 | { |
170 | setFlag(flags: Blending, on: true); |
171 | setFlag(flags: SupportsRhiShader, on: true); |
172 | } |
173 | |
174 | |
175 | /*! |
176 | int QSGVertexColorMaterial::compare() const |
177 | |
178 | As the vertex color material has all its state in the vertex attributes, |
179 | all materials will be equal. |
180 | |
181 | \internal |
182 | */ |
183 | |
184 | int QSGVertexColorMaterial::compare(const QSGMaterial * /* other */) const |
185 | { |
186 | return 0; |
187 | } |
188 | |
189 | /*! |
190 | \internal |
191 | */ |
192 | |
193 | QSGMaterialType *QSGVertexColorMaterial::type() const |
194 | { |
195 | static QSGMaterialType type; |
196 | return &type; |
197 | } |
198 | |
199 | |
200 | |
201 | /*! |
202 | \internal |
203 | */ |
204 | |
205 | QSGMaterialShader *QSGVertexColorMaterial::createShader() const |
206 | { |
207 | if (flags().testFlag(flag: RhiShaderWanted)) |
208 | return new QSGVertexColorMaterialRhiShader; |
209 | else |
210 | return new QSGVertexColorMaterialShader; |
211 | } |
212 | |
213 | QT_END_NAMESPACE |
214 | |