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    41 

    42 #include "painter.h"

    43 #include "light.h"

    44 #include "lightmodel.h"

    45 #include "material.h"

    46 #include <QtOpenGL/qglshaderprogram.h>

    47 

    48 ShaderPainter::ShaderPainter()

    49 {

    50     materialProgram = new QGLShaderProgram();

    51     materialProgram->addShaderFromSourceFile

    52         (QGLShader::Vertex, QLatin1String(":/lighting.vsh"));

    53     materialProgram->addShaderFromSourceFile

    54         (QGLShader::Fragment, QLatin1String(":/material.fsh"));

    55     materialProgram->bindAttributeLocation("vertex", 0);

    56     materialProgram->bindAttributeLocation("normal", 1);

    57     materialProgram->bindAttributeLocation("texcoord", 2);

    58     materialProgram->link();

    59 

    60     textureProgram = new QGLShaderProgram();

    61     textureProgram->addShaderFromSourceFile

    62         (QGLShader::Vertex, QLatin1String(":/lighting.vsh"));

    63     textureProgram->addShaderFromSourceFile

    64         (QGLShader::Fragment, QLatin1String(":/texture.fsh"));

    65     textureProgram->bindAttributeLocation("vertex", 0);

    66     textureProgram->bindAttributeLocation("normal", 1);

    67     textureProgram->bindAttributeLocation("texcoord", 2);

    68     textureProgram->link();

    69 

    70     currentProgram = 0;

    71     matricesChanged = false;

    72 }

    73 

    74 ShaderPainter::~ShaderPainter()

    75 {

    76     delete materialProgram;

    77     delete textureProgram;

    78 }

    79 

    80 void ShaderPainter::setMatrices(const QMatrix4x4 &mv, const QMatrix4x4 &proj)

    81 {

    82     combinedMatrix = proj * mv;

    83     modelViewMatrix = mv;

    84     normalMatrix = mv.normalMatrix();

    85     matricesChanged = true;

    86 }

    87 

    88 void ShaderPainter::selectMaterial(Material *material)

    89 {

    90     if (currentProgram != materialProgram) {

    91         materialProgram->bind();

    92         materialProgram->enableAttributeArray(0);

    93         materialProgram->enableAttributeArray(1);

    94         materialProgram->disableAttributeArray(2);

    95         currentProgram = materialProgram;

    96         matricesChanged = true;

    97     }

    98     if (matricesChanged) {

    99         materialProgram->setUniformValue("matrix", combinedMatrix);

   100         materialProgram->setUniformValue("modelView", modelViewMatrix);

   101         materialProgram->setUniformValue("normalMatrix", normalMatrix);

   102         matricesChanged = false;

   103     }

   104     updateMaterials(materialProgram, material);

   105 }

   106 

   107 void ShaderPainter::selectTexturedMaterial(Material *material)

   108 {

   109     if (currentProgram != textureProgram) {

   110         textureProgram->bind();

   111         textureProgram->enableAttributeArray(0);

   112         textureProgram->enableAttributeArray(1);

   113         textureProgram->enableAttributeArray(2);

   114         textureProgram->setUniformValue("tex", 0);

   115         currentProgram = textureProgram;

   116         matricesChanged = true;

   117     }

   118     if (matricesChanged) {

   119         textureProgram->setUniformValue("matrix", combinedMatrix);

   120         textureProgram->setUniformValue("modelView", modelViewMatrix);

   121         textureProgram->setUniformValue("normalMatrix", normalMatrix);

   122         matricesChanged = false;

   123     }

   124     updateMaterials(textureProgram, material);

   125 }

   126 

   127 void ShaderPainter::setVertices(const float *array, int stride)

   128 {

   129     // Doesn't matter which program we use - they have the same locations.

   130     materialProgram->setAttributeArray(0, array, 3, stride * sizeof(float));

   131 }

   132 

   133 void ShaderPainter::setTexCoords(const float *array, int stride)

   134 {

   135     materialProgram->setAttributeArray(2, array, 2, stride * sizeof(float));

   136 }

   137 

   138 void ShaderPainter::setNormals(const float *array, int stride)

   139 {

   140     materialProgram->setAttributeArray(1, array, 3, stride * sizeof(float));

   141 }

   142 

   143 void ShaderPainter::updateMaterials

   144     (QGLShaderProgram *program, Material *material)

   145 {

   146     // Set the uniform variables for the light.

   147     QVector4D pli = light->eyePosition(QMatrix4x4());

   148     program->setUniformValue("pli", QVector3D(pli.x(), pli.y(), pli.z()));

   149     program->setUniformValue("pliw", GLfloat(pli.w()));

   150 

   151     // Set the uniform variables for the light model.

   152     program->setUniformValue("viewerAtInfinity", (int)(lightModel->viewerPosition() == LightModel::ViewerAtInfinity));

   153     program->setUniformValue("acs", lightModel->ambientSceneColor());

   154 

   155     // Set the uniform variables for the material.

   156     program->setUniformValue("acm", material->ambientColor());

   157     program->setUniformValue("dcm", material->diffuseColor());

   158     program->setUniformValue("scm", material->specularColor());

   159     program->setUniformValue("srm", (float)(material->shininess()));

   160 }