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    41 

    42 #include "painter.h"

    43 #include "light.h"

    44 #include "lightmodel.h"

    45 #include "material.h"

    46 

    47 FixedFunctionPainter::FixedFunctionPainter()

    48 {

    49     glEnable(GL_LIGHTING);

    50     glEnable(GL_LIGHT0);

    51     glDisable(GL_CULL_FACE);

    52 }

    53 

    54 static void setMatrix(GLenum type, const QMatrix4x4 &matrix)

    55 {

    56     glMatrixMode(type);

    57     if (sizeof(qreal) == sizeof(GLfloat)) {

    58         glLoadMatrixf(reinterpret_cast<const GLfloat *>(matrix.constData()));

    59     } else {

    60         GLfloat mat[16];

    61         const qreal *m = matrix.constData();

    62         for (int index = 0; index < 16; ++index)

    63             mat[index] = m[index];

    64         glLoadMatrixf(mat);

    65     }

    66 }

    67 

    68 void FixedFunctionPainter::setMatrices

    69     (const QMatrix4x4 &mv, const QMatrix4x4 &proj)

    70 {

    71     setMatrix(GL_PROJECTION, proj);

    72     setMatrix(GL_MODELVIEW, mv);

    73 }

    74 

    75 static void setLight(int light, const Light *parameters,

    76                      const QMatrix4x4& transform = QMatrix4x4())

    77 {

    78     GLfloat params[4];

    79 

    80     glMatrixMode(GL_MODELVIEW);

    81     glPushMatrix();

    82     glLoadIdentity();

    83 

    84     QColor color = parameters->ambientColor();

    85     params[0] = color.redF();

    86     params[1] = color.greenF();

    87     params[2] = color.blueF();

    88     params[3] = color.alphaF();

    89     glLightfv(light, GL_AMBIENT, params);

    90 

    91     color = parameters->diffuseColor();

    92     params[0] = color.redF();

    93     params[1] = color.greenF();

    94     params[2] = color.blueF();

    95     params[3] = color.alphaF();

    96     glLightfv(light, GL_DIFFUSE, params);

    97 

    98     color = parameters->specularColor();

    99     params[0] = color.redF();

   100     params[1] = color.greenF();

   101     params[2] = color.blueF();

   102     params[3] = color.alphaF();

   103     glLightfv(light, GL_SPECULAR, params);

   104 

   105     QVector4D vector = parameters->eyePosition(transform);

   106     params[0] = vector.x();

   107     params[1] = vector.y();

   108     params[2] = vector.z();

   109     params[3] = vector.w();

   110     glLightfv(light, GL_POSITION, params);

   111 

   112     QVector3D spotDirection = parameters->eyeSpotDirection(transform);

   113     params[0] = spotDirection.x();

   114     params[1] = spotDirection.y();

   115     params[2] = spotDirection.z();

   116     glLightfv(light, GL_SPOT_DIRECTION, params);

   117 

   118     params[0] = parameters->spotExponent();

   119     glLightfv(light, GL_SPOT_EXPONENT, params);

   120 

   121     params[0] = parameters->spotAngle();

   122     glLightfv(light, GL_SPOT_CUTOFF, params);

   123 

   124     params[0] = parameters->constantAttenuation();

   125     glLightfv(light, GL_CONSTANT_ATTENUATION, params);

   126 

   127     params[0] = parameters->linearAttenuation();

   128     glLightfv(light, GL_LINEAR_ATTENUATION, params);

   129 

   130     params[0] = parameters->quadraticAttenuation();

   131     glLightfv(light, GL_QUADRATIC_ATTENUATION, params);

   132 

   133     glPopMatrix();

   134 }

   135 

   136 static void setLightModel(const LightModel *lightModel)

   137 {

   138     GLfloat values[4];

   139 #ifdef GL_LIGHT_MODEL_TWO_SIDE

   140     if (lightModel->model() == LightModel::TwoSided)

   141         values[0] = 1.0f;

   142     else

   143         values[0] = 0.0f;

   144     glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, values);

   145 #endif

   146 #ifdef GL_LIGHT_MODEL_COLOR_CONTROL

   147     if (lightModel->colorControl() == LightModel::SeparateSpecularColor)

   148         values[0] = GL_SEPARATE_SPECULAR_COLOR;

   149     else

   150         values[0] = GL_SINGLE_COLOR;

   151     glLightModelfv(GL_LIGHT_MODEL_COLOR_CONTROL, values);

   152 #endif

   153 #ifdef GL_LIGHT_MODEL_LOCAL_VIEWER

   154     if (lightModel->viewerPosition() == LightModel::LocalViewer)

   155         values[0] = 1.0f;

   156     else

   157         values[0] = 0.0f;

   158     glLightModelfv(GL_LIGHT_MODEL_LOCAL_VIEWER, values);

   159 #endif

   160 #ifdef GL_LIGHT_MODEL_AMBIENT

   161     QColor color = lightModel->ambientSceneColor();

   162     values[0] = color.redF();

   163     values[1] = color.blueF();

   164     values[2] = color.greenF();

   165     values[3] = color.alphaF();

   166     glLightModelfv(GL_LIGHT_MODEL_AMBIENT, values);

   167 #endif

   168 }

   169 

   170 static void setMaterial(int face, const Material *parameters)

   171 {

   172     GLfloat params[17];

   173 

   174     QColor mcolor = parameters->ambientColor();

   175     params[0] = mcolor.redF();

   176     params[1] = mcolor.greenF();

   177     params[2] = mcolor.blueF();

   178     params[3] = mcolor.alphaF();

   179 

   180     mcolor = parameters->diffuseColor();

   181     params[4] = mcolor.redF();

   182     params[5] = mcolor.greenF();

   183     params[6] = mcolor.blueF();

   184     params[7] = mcolor.alphaF();

   185 

   186     mcolor = parameters->specularColor();

   187     params[8] = mcolor.redF();

   188     params[9] = mcolor.greenF();

   189     params[10] = mcolor.blueF();

   190     params[11] = mcolor.alphaF();

   191 

   192     mcolor = parameters->emittedLight();

   193     params[12] = mcolor.redF();

   194     params[13] = mcolor.greenF();

   195     params[14] = mcolor.blueF();

   196     params[15] = mcolor.alphaF();

   197 

   198     params[16] = parameters->shininess();

   199 

   200     glMaterialfv(face, GL_AMBIENT, params);

   201     glMaterialfv(face, GL_DIFFUSE, params + 4);

   202     glMaterialfv(face, GL_SPECULAR, params + 8);

   203     glMaterialfv(face, GL_EMISSION, params + 12);

   204     glMaterialfv(face, GL_SHININESS, params + 16);

   205 }

   206 

   207 void FixedFunctionPainter::selectMaterial(Material *material)

   208 {

   209     ::setLight(GL_LIGHT0, light);

   210     ::setLightModel(lightModel);

   211     ::setMaterial(GL_FRONT_AND_BACK, material);

   212     glDisable(GL_TEXTURE_2D);

   213     glEnableClientState(GL_VERTEX_ARRAY);

   214     glEnableClientState(GL_NORMAL_ARRAY);

   215     glDisableClientState(GL_TEXTURE_COORD_ARRAY);

   216 }

   217 

   218 void FixedFunctionPainter::selectTexturedMaterial(Material *material)

   219 {

   220     ::setLight(GL_LIGHT0, light);

   221     ::setLightModel(lightModel);

   222     ::setMaterial(GL_FRONT_AND_BACK, material);

   223     glEnable(GL_TEXTURE_2D);

   224     glEnableClientState(GL_VERTEX_ARRAY);

   225     glEnableClientState(GL_NORMAL_ARRAY);

   226     glEnableClientState(GL_TEXTURE_COORD_ARRAY);

   227     glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);

   228 }

   229 

   230 void FixedFunctionPainter::setVertices(const float *array, int stride)

   231 {

   232     glVertexPointer(3, GL_FLOAT, stride * sizeof(float), array);

   233 }

   234 

   235 void FixedFunctionPainter::setTexCoords(const float *array, int stride)

   236 {

   237     glTexCoordPointer(2, GL_FLOAT, stride * sizeof(float), array);

   238 }

   239 

   240 void FixedFunctionPainter::setNormals(const float *array, int stride)

   241 {

   242     glNormalPointer(GL_FLOAT, stride * sizeof(float), array);

   243 }