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    41 

    42 #include "glbuffers.h"

    43 #include <QtGui/qmatrix4x4.h>

    44 

    45 //============================================================================//

    46 //                                  GLTexture                                 //

    47 //============================================================================//

    48 

    49 GLTexture::GLTexture() : m_texture(0), m_failed(false)

    50 {

    51     glGenTextures(1, &m_texture);

    52 }

    53 

    54 GLTexture::~GLTexture()

    55 {

    56     glDeleteTextures(1, &m_texture);

    57 }

    58 

    59 //============================================================================//

    60 //                                 GLTexture2D                                //

    61 //============================================================================//

    62 

    63 GLTexture2D::GLTexture2D(int width, int height)

    64 {

    65     glBindTexture(GL_TEXTURE_2D, m_texture);

    66     glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,

    67         GL_BGRA, GL_UNSIGNED_BYTE, 0);

    68 

    69     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

    70     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

    71     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    72     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    73     //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

    74     //glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);

    75     glBindTexture(GL_TEXTURE_2D, 0);

    76 }

    77 

    78 

    79 GLTexture2D::GLTexture2D(const QString& fileName, int width, int height)

    80 {

    81     // TODO: Add error handling.

    82     QImage image(fileName);

    83 

    84     if (image.isNull()) {

    85         m_failed = true;

    86         return;

    87     }

    88 

    89     image = image.convertToFormat(QImage::Format_ARGB32);

    90 

    91     //qDebug() << "Image size:" << image.width() << "x" << image.height();

    92     if (width <= 0)

    93         width = image.width();

    94     if (height <= 0)

    95         height = image.height();

    96     if (width != image.width() || height != image.height())

    97         image = image.scaled(width, height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

    98 

    99     glBindTexture(GL_TEXTURE_2D, m_texture);

   100 

   101     // Works on x86, so probably works on all little-endian systems.

   102     // Does it work on big-endian systems?

   103     glTexImage2D(GL_TEXTURE_2D, 0, 4, image.width(), image.height(), 0,

   104         GL_BGRA, GL_UNSIGNED_BYTE, image.bits());

   105 

   106     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

   107     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

   108     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

   109     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

   110     //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

   111     //glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);

   112     glBindTexture(GL_TEXTURE_2D, 0);

   113 }

   114 

   115 void GLTexture2D::load(int width, int height, QRgb *data)

   116 {

   117     glBindTexture(GL_TEXTURE_2D, m_texture);

   118     glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,

   119         GL_BGRA, GL_UNSIGNED_BYTE, data);

   120     glBindTexture(GL_TEXTURE_2D, 0);

   121 }

   122 

   123 void GLTexture2D::bind()

   124 {

   125     glBindTexture(GL_TEXTURE_2D, m_texture);

   126     glEnable(GL_TEXTURE_2D);

   127 }

   128 

   129 void GLTexture2D::unbind()

   130 {

   131     glBindTexture(GL_TEXTURE_2D, 0);

   132     glDisable(GL_TEXTURE_2D);

   133 }

   134 

   135 

   136 //============================================================================//

   137 //                                 GLTexture3D                                //

   138 //============================================================================//

   139 

   140 GLTexture3D::GLTexture3D(int width, int height, int depth)

   141 {

   142     GLBUFFERS_ASSERT_OPENGL("GLTexture3D::GLTexture3D", glTexImage3D, return)

   143 

   144     glBindTexture(GL_TEXTURE_3D, m_texture);

   145     glTexImage3D(GL_TEXTURE_3D, 0, 4, width, height, depth, 0,

   146         GL_BGRA, GL_UNSIGNED_BYTE, 0);

   147 

   148     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);

   149     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);

   150     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);

   151     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

   152     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

   153     //glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

   154     //glTexParameteri(GL_TEXTURE_3D, GL_GENERATE_MIPMAP, GL_TRUE);

   155     glBindTexture(GL_TEXTURE_3D, 0);

   156 }

   157 

   158 void GLTexture3D::load(int width, int height, int depth, QRgb *data)

   159 {

   160     GLBUFFERS_ASSERT_OPENGL("GLTexture3D::load", glTexImage3D, return)

   161 

   162     glBindTexture(GL_TEXTURE_3D, m_texture);

   163     glTexImage3D(GL_TEXTURE_3D, 0, 4, width, height, depth, 0,

   164         GL_BGRA, GL_UNSIGNED_BYTE, data);

   165     glBindTexture(GL_TEXTURE_3D, 0);

   166 }

   167 

   168 void GLTexture3D::bind()

   169 {

   170     glBindTexture(GL_TEXTURE_3D, m_texture);

   171     glEnable(GL_TEXTURE_3D);

   172 }

   173 

   174 void GLTexture3D::unbind()

   175 {

   176     glBindTexture(GL_TEXTURE_3D, 0);

   177     glDisable(GL_TEXTURE_3D);

   178 }

   179 

   180 //============================================================================//

   181 //                                GLTextureCube                               //

   182 //============================================================================//

   183 

   184 GLTextureCube::GLTextureCube(int size)

   185 {

   186     glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);

   187 

   188     for (int i = 0; i < 6; ++i)

   189         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 4, size, size, 0,

   190             GL_BGRA, GL_UNSIGNED_BYTE, 0);

   191 

   192     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

   193     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

   194     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

   195     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

   196     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

   197     //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

   198     //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE);

   199     glBindTexture(GL_TEXTURE_CUBE_MAP, 0);

   200 }

   201 

   202 GLTextureCube::GLTextureCube(const QStringList& fileNames, int size)

   203 {

   204     // TODO: Add error handling.

   205 

   206     glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);

   207 

   208     int index = 0;

   209     foreach (QString file, fileNames) {

   210         QImage image(file);

   211         if (image.isNull()) {

   212             m_failed = true;

   213             break;

   214         }

   215 

   216         image = image.convertToFormat(QImage::Format_ARGB32);

   217 

   218         //qDebug() << "Image size:" << image.width() << "x" << image.height();

   219         if (size <= 0)

   220             size = image.width();

   221         if (size != image.width() || size != image.height())

   222             image = image.scaled(size, size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

   223 

   224         // Works on x86, so probably works on all little-endian systems.

   225         // Does it work on big-endian systems?

   226         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + index, 0, 4, image.width(), image.height(), 0,

   227             GL_BGRA, GL_UNSIGNED_BYTE, image.bits());

   228 

   229         if (++index == 6)

   230             break;

   231     }

   232 

   233     // Clear remaining faces.

   234     while (index < 6) {

   235         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + index, 0, 4, size, size, 0,

   236             GL_BGRA, GL_UNSIGNED_BYTE, 0);

   237         ++index;

   238     }

   239 

   240     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

   241     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

   242     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

   243     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

   244     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

   245     //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

   246     //glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE);

   247     glBindTexture(GL_TEXTURE_CUBE_MAP, 0);

   248 }

   249 

   250 void GLTextureCube::load(int size, int face, QRgb *data)

   251 {

   252     glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);

   253         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, 0, 4, size, size, 0,

   254             GL_BGRA, GL_UNSIGNED_BYTE, data);

   255     glBindTexture(GL_TEXTURE_CUBE_MAP, 0);

   256 }

   257 

   258 void GLTextureCube::bind()

   259 {

   260     glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);

   261     glEnable(GL_TEXTURE_CUBE_MAP);

   262 }

   263 

   264 void GLTextureCube::unbind()

   265 {

   266     glBindTexture(GL_TEXTURE_CUBE_MAP, 0);

   267     glDisable(GL_TEXTURE_CUBE_MAP);

   268 }

   269 

   270 //============================================================================//

   271 //                            GLFrameBufferObject                             //

   272 //============================================================================//

   273 

   274 GLFrameBufferObject::GLFrameBufferObject(int width, int height)

   275     : m_fbo(0)

   276     , m_depthBuffer(0)

   277     , m_width(width)

   278     , m_height(height)

   279     , m_failed(false)

   280 {

   281     GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::GLFrameBufferObject",

   282         glGenFramebuffersEXT && glGenRenderbuffersEXT && glBindRenderbufferEXT && glRenderbufferStorageEXT, return)

   283 

   284     // TODO: share depth buffers of same size

   285     glGenFramebuffersEXT(1, &m_fbo);

   286     //glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);

   287     glGenRenderbuffersEXT(1, &m_depthBuffer);

   288     glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, m_depthBuffer);

   289     glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, m_width, m_height);

   290     //glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_depthBuffer);

   291     //glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

   292 }

   293 

   294 GLFrameBufferObject::~GLFrameBufferObject()

   295 {

   296     GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::~GLFrameBufferObject",

   297         glDeleteFramebuffersEXT && glDeleteRenderbuffersEXT, return)

   298 

   299     glDeleteFramebuffersEXT(1, &m_fbo);

   300     glDeleteRenderbuffersEXT(1, &m_depthBuffer);

   301 }

   302 

   303 void GLFrameBufferObject::setAsRenderTarget(bool state)

   304 {

   305     GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::setAsRenderTarget", glBindFramebufferEXT, return)

   306 

   307     if (state) {

   308         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);

   309         glPushAttrib(GL_VIEWPORT_BIT);

   310         glViewport(0, 0, m_width, m_height);

   311     } else {

   312         glPopAttrib();

   313         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);

   314     }

   315 }

   316 

   317 bool GLFrameBufferObject::isComplete()

   318 {

   319     GLBUFFERS_ASSERT_OPENGL("GLFrameBufferObject::isComplete", glCheckFramebufferStatusEXT, return false)

   320 

   321     return GL_FRAMEBUFFER_COMPLETE_EXT == glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);

   322 }

   323 

   324 //============================================================================//

   325 //                             GLRenderTargetCube                             //

   326 //============================================================================//

   327 

   328 GLRenderTargetCube::GLRenderTargetCube(int size)

   329     : GLTextureCube(size)

   330     , m_fbo(size, size)

   331 {

   332 }

   333 

   334 void GLRenderTargetCube::begin(int face)

   335 {

   336     GLBUFFERS_ASSERT_OPENGL("GLRenderTargetCube::begin",

   337         glFramebufferTexture2DEXT && glFramebufferRenderbufferEXT, return)

   338 

   339     m_fbo.setAsRenderTarget(true);

   340     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,

   341         GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, m_texture, 0);

   342     glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_fbo.m_depthBuffer);

   343 }

   344 

   345 void GLRenderTargetCube::end()

   346 {

   347     m_fbo.setAsRenderTarget(false);

   348 }

   349 

   350 void GLRenderTargetCube::getViewMatrix(QMatrix4x4& mat, int face)

   351 {

   352     if (face < 0 || face >= 6) {

   353         qWarning("GLRenderTargetCube::getViewMatrix: 'face' must be in the range [0, 6). (face == %d)", face);

   354         return;

   355     }

   356 

   357     static int perm[6][3] = {

   358         {2, 1, 0},

   359         {2, 1, 0},

   360         {0, 2, 1},

   361         {0, 2, 1},

   362         {0, 1, 2},

   363         {0, 1, 2},

   364     };

   365 

   366     static float signs[6][3] = {

   367         {-1.0f, -1.0f, -1.0f},

   368         {+1.0f, -1.0f, +1.0f},

   369         {+1.0f, +1.0f, -1.0f},

   370         {+1.0f, -1.0f, +1.0f},

   371         {+1.0f, -1.0f, -1.0f},

   372         {-1.0f, -1.0f, +1.0f},

   373     };

   374 

   375     mat.fill(0.0f);

   376     for (int i = 0; i < 3; ++i)

   377         mat(i, perm[face][i]) = signs[face][i];

   378     mat(3, 3) = 1.0f;

   379 }

   380 

   381 void GLRenderTargetCube::getProjectionMatrix(QMatrix4x4& mat, float nearZ, float farZ)

   382 {

   383     static const QMatrix4x4 reference(

   384             1.0f, 0.0f, 0.0f, 0.0f,

   385             0.0f, 1.0f, 0.0f, 0.0f,

   386             0.0f, 0.0f, 0.0f, 0.0f,

   387             0.0f, 0.0f, -1.0f, 0.0f);

   388 

   389     mat = reference;

   390     mat(2, 2) = (nearZ+farZ)/(nearZ-farZ);

   391     mat(2, 3) = 2.0f*nearZ*farZ/(nearZ-farZ);

   392 }