Support transparent texture

Add alpha channel support for color texture. The transparency is supported in render preview, export texture preview and glTF exporter.

languages/dust3d_zh_CN.ts

@@ -787,6 +787,10 @@ Tips:
         <source>Hollow</source>
         <translation>空心</translation>
     </message>
+    <message>
+        <source>Transparency</source>
+        <translation>透明度</translation>
+    </message>
 </context>
 <context>
     <name>PoseEditWidget</name>

shaders/default.vert

@@ -1,25 +1,27 @@
-attribute vec4 vertex;
+attribute highp vec4 vertex;
-attribute vec3 normal;
+attribute highp vec3 normal;
-attribute vec3 color;
+attribute highp vec3 color;
-attribute vec2 texCoord;
+attribute highp vec2 texCoord;
-attribute float metalness;
+attribute highp float metalness;
-attribute float roughness;
+attribute highp float roughness;
-attribute vec3 tangent;
+attribute highp vec3 tangent;
-varying vec3 vert;
+attribute highp float alpha;
-varying vec3 vertRaw;
+varying highp vec3 vert;
-varying vec3 vertNormal;
+varying highp vec3 vertRaw;
-varying vec3 vertColor;
+varying highp vec3 vertNormal;
-varying vec2 vertTexCoord;
+varying highp vec3 vertColor;
-varying float vertMetalness;
+varying highp vec2 vertTexCoord;
-varying float vertRoughness;
+varying highp float vertMetalness;
-varying vec3 cameraPos;
+varying highp float vertRoughness;
-varying vec3 firstLightPos;
+varying highp vec3 cameraPos;
-varying vec3 secondLightPos;
+varying highp vec3 firstLightPos;
-varying vec3 thirdLightPos;
+varying highp vec3 secondLightPos;
-uniform mat4 projectionMatrix;
+varying highp vec3 thirdLightPos;
-uniform mat4 modelMatrix;
+varying highp float vertAlpha;
-uniform mat3 normalMatrix;
+uniform highp mat4 projectionMatrix;
-uniform mat4 viewMatrix;
+uniform highp mat4 modelMatrix;
+uniform highp mat3 normalMatrix;
+uniform highp mat4 viewMatrix;
 uniform highp int normalMapEnabled;
 
 mat3 transpose(mat3 m) 
@@ -35,6 +37,7 @@ void main()
     vertRaw = vert;
     vertNormal = normalize((modelMatrix * vec4(normal, 1.0)).xyz);
     vertColor = color;
+    vertAlpha = alpha;
     cameraPos = vec3(0, 0, -4.0);
 
     firstLightPos = vec3(5.0, 5.0, 5.0);

shaders/pbr-qt.frag

@@ -67,6 +67,7 @@ varying highp vec3 cameraPos;
 varying highp vec3 firstLightPos;
 varying highp vec3 secondLightPos;
 varying highp vec3 thirdLightPos;
+varying highp float vertAlpha;
 uniform highp vec3 lightPos;
 uniform highp sampler2D textureId;
 uniform highp int textureEnabled;
@@ -280,7 +281,7 @@ highp vec4 metalRoughFunction(const in highp vec4 baseColor,
     // Apply gamma correction prior to display
     highp vec3 cGamma = gammaCorrect(cToneMapped);
 
-    return vec4(cGamma, 1.0);
+    return vec4(cGamma, baseColor.a);
 }
 
 void main() 
@@ -321,8 +322,11 @@ void main()
     lights[2].quadraticAttenuation = 0.0;
 
     highp vec3 color = vertColor;
+    highp float alpha = vertAlpha;
     if (textureEnabled == 1) {
-        color = texture2D(textureId, vertTexCoord).rgb;
+        highp vec4 textColor = texture2D(textureId, vertTexCoord);
+        color = textColor.rgb;
+        alpha = textColor.a;
     }
     if (mousePickEnabled == 1) {
         if (distance(mousePickTargetPosition, vertRaw) <= mousePickRadius) {
@@ -358,7 +362,7 @@ void main()
     
     roughness = min(0.99, roughness);
 
-    gl_FragColor = metalRoughFunction(vec4(color, 1.0),
+    gl_FragColor = metalRoughFunction(vec4(color, alpha),
                                       metalness,
                                       roughness,
                                       ambientOcclusion,

src/document.cpp

@@ -1064,7 +1064,7 @@ void Document::toSnapshot(Snapshot *snapshot, const std::set<QUuid> &limitNodeId
             }
             part["dirty"] = partIt.second.dirty ? "true" : "false";
             if (partIt.second.hasColor)
-                part["color"] = partIt.second.color.name();
+                part["color"] = partIt.second.color.name(QColor::HexArgb);
             if (partIt.second.colorSolubilityAdjusted())
                 part["colorSolubility"] = QString::number(partIt.second.colorSolubility);
             if (partIt.second.deformThicknessAdjusted())

src/glbfile.cpp

@@ -169,6 +169,7 @@ GlbFileWriter::GlbFileWriter(Outcome &outcome,
         m_json["materials"][primitiveIndex]["pbrMetallicRoughness"]["baseColorTexture"]["index"] = textureIndex++;
         m_json["materials"][primitiveIndex]["pbrMetallicRoughness"]["metallicFactor"] = MeshLoader::m_defaultMetalness;
         m_json["materials"][primitiveIndex]["pbrMetallicRoughness"]["roughnessFactor"] = MeshLoader::m_defaultRoughness;
+        m_json["materials"][primitiveIndex]["alphaMode"] = "BLEND";
         if (normalImage) {
             m_json["materials"][primitiveIndex]["normalTexture"]["index"] = textureIndex++;
         }

src/meshloader.cpp

@@ -82,6 +82,7 @@ MeshLoader::MeshLoader(const std::vector<QVector3D> &vertices, const std::vector
             dest->colorR = color.redF();
             dest->colorG = color.greenF();
             dest->colorB = color.blueF();
+            dest->alpha = color.alphaF();
             dest->posX = srcVert->x();
             dest->posY = srcVert->y();
             dest->posZ = srcVert->z();
@@ -138,6 +139,7 @@ MeshLoader::MeshLoader(Outcome &outcome) :
             dest->colorR = triangleColor->redF();
             dest->colorG = triangleColor->greenF();
             dest->colorB = triangleColor->blueF();
+            dest->alpha = triangleColor->alphaF();
             dest->posX = srcVert->x();
             dest->posY = srcVert->y();
             dest->posZ = srcVert->z();
@@ -155,7 +157,6 @@ MeshLoader::MeshLoader(Outcome &outcome) :
         }
     }
     
-    // Uncomment out to show wireframes
     size_t edgeCount = 0;
     for (const auto &face: outcome.triangleAndQuads) {
         edgeCount += face.size();

src/modelmeshbinder.cpp

@@ -118,6 +118,7 @@ void ModelMeshBinder::paint(ModelShaderProgram *program)
                     f->glEnableVertexAttribArray(4);
                     f->glEnableVertexAttribArray(5);
                     f->glEnableVertexAttribArray(6);
+                    f->glEnableVertexAttribArray(7);
                     f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), 0);
                     f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(3 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(6 * sizeof(GLfloat)));
@@ -125,6 +126,7 @@ void ModelMeshBinder::paint(ModelShaderProgram *program)
                     f->glVertexAttribPointer(4, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(11 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(5, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(12 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(6, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(13 * sizeof(GLfloat)));
+                    f->glVertexAttribPointer(7, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(16 * sizeof(GLfloat)));
                     m_vboTriangle.release();
                 }
                 {
@@ -143,6 +145,7 @@ void ModelMeshBinder::paint(ModelShaderProgram *program)
                     f->glEnableVertexAttribArray(4);
                     f->glEnableVertexAttribArray(5);
                     f->glEnableVertexAttribArray(6);
+                    f->glEnableVertexAttribArray(7);
                     f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), 0);
                     f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(3 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(6 * sizeof(GLfloat)));
@@ -150,6 +153,7 @@ void ModelMeshBinder::paint(ModelShaderProgram *program)
                     f->glVertexAttribPointer(4, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(11 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(5, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(12 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(6, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(13 * sizeof(GLfloat)));
+                    f->glVertexAttribPointer(7, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(16 * sizeof(GLfloat)));
                     m_vboEdge.release();
                 }
                 if (m_toolEnabled) {
@@ -168,6 +172,7 @@ void ModelMeshBinder::paint(ModelShaderProgram *program)
                     f->glEnableVertexAttribArray(4);
                     f->glEnableVertexAttribArray(5);
                     f->glEnableVertexAttribArray(6);
+                    f->glEnableVertexAttribArray(7);
                     f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), 0);
                     f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(3 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(6 * sizeof(GLfloat)));
@@ -175,6 +180,7 @@ void ModelMeshBinder::paint(ModelShaderProgram *program)
                     f->glVertexAttribPointer(4, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(11 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(5, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(12 * sizeof(GLfloat)));
                     f->glVertexAttribPointer(6, 3, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(13 * sizeof(GLfloat)));
+                    f->glVertexAttribPointer(7, 1, GL_FLOAT, GL_FALSE, sizeof(ShaderVertex), reinterpret_cast<void *>(16 * sizeof(GLfloat)));
                     m_vboTool.release();
                 } else {
                     m_renderToolVertexCount = 0;

src/modelshaderprogram.cpp

@@ -37,6 +37,7 @@ ModelShaderProgram::ModelShaderProgram(bool usePBR)
     this->bindAttributeLocation("metalness", 4);
     this->bindAttributeLocation("roughness", 5);
     this->bindAttributeLocation("tangent", 6);
+    this->bindAttributeLocation("alpha", 7);
     this->link();
 
     this->bind();

src/modelwidget.cpp

@@ -146,6 +146,8 @@ void ModelWidget::initializeGL()
 void ModelWidget::paintGL()
 {
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glEnable(GL_BLEND);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glEnable(GL_DEPTH_TEST);
     glEnable(GL_CULL_FACE);
 #ifdef GL_LINE_SMOOTH

src/partwidget.cpp

@@ -376,11 +376,44 @@ void PartWidget::showColorSettingPopup(const QPoint &pos)
         QColor color = QColorDialog::getColor(part->color, this);
         emit enableBackgroundBlur();
         if (color.isValid()) {
+            const SkeletonPart *part = m_document->findPart(m_partId);
+            if (nullptr == part) {
+                return;
+            }
+            color.setAlphaF(part->color.alphaF());
             emit setPartColorState(m_partId, true, color);
             emit groupOperationAdded();
         }
     });
     
+    FloatNumberWidget *colorTransparencyWidget = new FloatNumberWidget;
+    colorTransparencyWidget->setItemName(tr("Transparency"));
+    colorTransparencyWidget->setRange(0.0, 1.0);
+    colorTransparencyWidget->setValue(1.0 - part->color.alphaF());
+    
+    connect(colorTransparencyWidget, &FloatNumberWidget::valueChanged, [=](float value) {
+        const SkeletonPart *part = m_document->findPart(m_partId);
+        if (nullptr == part) {
+            return;
+        }
+        QColor color = part->color;
+        color.setAlphaF(1.0 - value);
+        emit setPartColorState(m_partId, true, color);
+        emit groupOperationAdded();
+    });
+    
+    QPushButton *colorTransparencyEraser = new QPushButton(QChar(fa::eraser));
+    initToolButton(colorTransparencyEraser);
+    
+    connect(colorTransparencyEraser, &QPushButton::clicked, [=]() {
+        colorTransparencyWidget->setValue(0.0);
+        emit groupOperationAdded();
+    });
+    
+    QHBoxLayout *colorTransparencyLayout = new QHBoxLayout;
+    colorTransparencyLayout->addWidget(colorTransparencyEraser);
+    colorTransparencyLayout->addWidget(colorTransparencyWidget);
+    
     FloatNumberWidget *colorSolubilityWidget = new FloatNumberWidget;
     colorSolubilityWidget->setItemName(tr("Solubility"));
     colorSolubilityWidget->setRange(0.0, 1.0);
@@ -405,6 +438,7 @@ void PartWidget::showColorSettingPopup(const QPoint &pos)
     
     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout->addLayout(colorLayout);
+    mainLayout->addLayout(colorTransparencyLayout);
     mainLayout->addLayout(colorSolubilityLayout);
     
     if (m_document->materialIdList.empty()) {

src/shadervertex.h

@@ -22,6 +22,7 @@ typedef struct
     GLfloat tangentX;
     GLfloat tangentY;
     GLfloat tangentZ;
+    GLfloat alpha = 1.0;
 } ShaderVertex;
 #pragma pack(pop)
 

src/texturegenerator.cpp

@@ -11,7 +11,7 @@
 #include "material.h"
 
 int TextureGenerator::m_textureSize = 1024;
-QColor TextureGenerator::m_defaultTextureColor = Qt::white; //Qt::darkGray;
+QColor TextureGenerator::m_defaultTextureColor = Qt::transparent; //Qt::darkGray;
 
 TextureGenerator::TextureGenerator(const Outcome &outcome, Snapshot *snapshot) :
     m_resultTextureGuideImage(nullptr),
@@ -540,11 +540,22 @@ void TextureGenerator::generate()
     
     m_resultTextureImage = new QImage(*m_resultTextureColorImage);
     
+    QImage uvCheckImage(":/resources/checkuv.png");
+    
     m_resultTextureGuideImage = new QImage(*m_resultTextureImage);
+    {
+        QPainter mergeTextureGuidePainter(m_resultTextureGuideImage);
+        mergeTextureGuidePainter.setCompositionMode(QPainter::CompositionMode_DestinationOver);
+        mergeTextureGuidePainter.drawImage(0, 0, uvCheckImage);
+        mergeTextureGuidePainter.end();
+    }
+    
+    {
         QPainter mergeTextureGuidePainter(m_resultTextureGuideImage);
         mergeTextureGuidePainter.setCompositionMode(QPainter::CompositionMode_Multiply);
         mergeTextureGuidePainter.drawImage(0, 0, *m_resultTextureBorderImage);
         mergeTextureGuidePainter.end();
+    }
     
     auto createResultBeginTime = countTimeConsumed.elapsed();
     m_resultMesh = new MeshLoader(*m_outcome);