/****************************************************************************** * Renders a 2d polyline in the viewport. ******************************************************************************/ void ViewportSceneRenderer::render2DPolyline(const Point2* points, int count, const ColorA& color, bool closed) { OVITO_STATIC_ASSERT(sizeof(points[0]) == 2*sizeof(GLfloat)); // Load OpenGL shader. QOpenGLShaderProgram* shader = loadShaderProgram("line", ":/core/glsl/lines/line.vs", ":/core/glsl/lines/line.fs"); if(!shader->bind()) throw Exception(tr("Failed to bind OpenGL shader.")); bool wasDepthTestEnabled = glIsEnabled(GL_DEPTH_TEST); glDisable(GL_DEPTH_TEST); GLint vc[4]; glGetIntegerv(GL_VIEWPORT, vc); QMatrix4x4 tm; tm.ortho(vc[0], vc[0] + vc[2], vc[1] + vc[3], vc[1], -1, 1); OVITO_CHECK_OPENGL(shader->setUniformValue("modelview_projection_matrix", tm)); QOpenGLBuffer vertexBuffer; if(glformat().majorVersion() >= 3) { if(!vertexBuffer.create()) throw Exception(tr("Failed to create OpenGL vertex buffer.")); if(!vertexBuffer.bind()) throw Exception(tr("Failed to bind OpenGL vertex buffer.")); vertexBuffer.allocate(points, 2 * sizeof(GLfloat) * count); OVITO_CHECK_OPENGL(shader->enableAttributeArray("position")); OVITO_CHECK_OPENGL(shader->setAttributeBuffer("position", GL_FLOAT, 0, 2)); vertexBuffer.release(); } else { OVITO_CHECK_OPENGL(glEnableClientState(GL_VERTEX_ARRAY)); OVITO_CHECK_OPENGL(glVertexPointer(2, GL_FLOAT, 0, points)); } if(glformat().majorVersion() >= 3) { OVITO_CHECK_OPENGL(shader->disableAttributeArray("color")); OVITO_CHECK_OPENGL(shader->setAttributeValue("color", color.r(), color.g(), color.b(), color.a())); } else { OVITO_CHECK_OPENGL(glColor4(color)); } OVITO_CHECK_OPENGL(glDrawArrays(closed ? GL_LINE_LOOP : GL_LINE_STRIP, 0, count)); if(glformat().majorVersion() >= 3) { shader->disableAttributeArray("position"); } else { OVITO_CHECK_OPENGL(glDisableClientState(GL_VERTEX_ARRAY)); } shader->release(); if(wasDepthTestEnabled) glEnable(GL_DEPTH_TEST); }