void GLWidget::setupVertexAttribs()
{
m_vertexBuffer.bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glVertexAttribPointer(
0, //index
3, //size
GL_FLOAT, //type
GL_FALSE, //normalized?
0, //stride
0 ); //array buffer offset
m_vertexBuffer.release();
m_normalBuffer.bind();
f->glEnableVertexAttribArray(1);
f->glVertexAttribPointer(
1, //index
3, //size
GL_FLOAT, //type
GL_FALSE, //normalized?
0, //stride
0 ); //array buffer offset
m_normalBuffer.release();
}
void Mesh::create()
{
if(isCreated()) { return; }
m_vao.create();
m_vao.bind();
m_vbo.create();
m_vbo.bind();
m_vbo.allocate(m_data.constData(), m_data.size() * sizeof(MeshVertex));
m_vbo.bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glEnableVertexAttribArray(1);
f->glEnableVertexAttribArray(2);
f->glEnableVertexAttribArray(3);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(MeshVertex), 0);
f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(MeshVertex), reinterpret_cast<void *>(3 * sizeof(GLfloat)));
f->glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(MeshVertex), reinterpret_cast<void *>(6 * sizeof(GLfloat)));
f->glVertexAttribPointer(3, 4, GL_FLOAT, GL_FALSE, sizeof(MeshVertex), reinterpret_cast<void *>(8 * sizeof(GLfloat)));
m_vbo.release();
m_vao.release();
m_isCreated = true;
}
void GlCube::initGL()
{
m_vao_constraints.create();
m_vbo_constraints.create();
m_ibo_constraints.create();
m_vao_constraints.bind(); CE();
m_vbo_constraints.bind(); CE();
m_vbo_constraints.setUsagePattern(QOpenGLBuffer::UsagePattern::StaticDraw); CE();
m_ibo_constraints.bind(); CE();
m_ibo_constraints.setUsagePattern(QOpenGLBuffer::UsagePattern::StaticDraw); CE();
QOpenGLFunctions * f = QOpenGLContext::currentContext()->functions();
GLsizei stride = sizeof(GLfloat) * 7;
f->glEnableVertexAttribArray(0); CE();
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, stride, (void*)(0)); CE();
f->glEnableVertexAttribArray(1); CE();
f->glVertexAttribPointer(1, 4, GL_FLOAT, GL_FALSE, stride, (void*)(sizeof(GLfloat) * 3)); CE();
m_vao_constraints.release(); CE();
m_vbo_constraints.release(); CE();
m_ibo_constraints.release(); CE();
fillBuffers();
}
//clockwise 4 vertex uv TL TR BL BR
void CubeFace::create(float x1,float y1, float x2,float y2,float x3,float y3,float x4,float y4)
{
QOpenGLFunctions f = QOpenGLFunctions(QOpenGLContext::currentContext());
//creat the vertexes
float CubeFaceVertices[] =
{
// Positions // Texture Coords
1,-1, 0, x3, y3,
1, 1, 0, x2, y2,
-1, 1, 0, x1, y1,
-1, 1, 0, x1, y1,
-1,-1, 0, x4, y4,
1,-1, 0, x3, y3,
};
m_buffer->bind();
m_buffer->allocate(CubeFaceVertices, sizeof(CubeFaceVertices));
m_vao->bind();
f.glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
f.glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
f.glEnableVertexAttribArray(0);
f.glEnableVertexAttribArray(1);
m_vao->release();
m_buffer->release();
}
void CompasWidget::setupVertexAttribs(){
m_logoVbo.bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glEnableVertexAttribArray(1);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), 0);
f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), reinterpret_cast<void *>(3 * sizeof(GLfloat)));
m_logoVbo.release();
}
void CompasWidget::setupVertexAttribs2(){
m_vbo2->bind();
m_program2->enableAttributeArray(0);
m_program2->enableAttributeArray(1);
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
f->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, (const void *)(36 * 3 * sizeof(GLfloat)));
m_vbo2->release();
}
void GLRasterTexture::setupVertexAttribs()
{
m_vbo.bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glEnableVertexAttribArray(1);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, DATA_DIMENSIONS * sizeof(GLfloat),
0);
f->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, DATA_DIMENSIONS * sizeof(GLfloat),
reinterpret_cast<void *>(3 * sizeof(GLfloat)));
m_vbo.release();
}
void CGLWidget::setupVertexAttribs()
{
m_vbo.bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
m_vbo.release();
m_uvBuff.bind();
f->glEnableVertexAttribArray(1);
f->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
m_uvBuff.release();
}
void ViewportWidget::SetupVertexAttributes(QOpenGLBuffer* vbo)
{
if (!vbo)
return;
vbo->bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glEnableVertexAttribArray(1);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), 0);
f->glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(GLfloat), reinterpret_cast<void *>(3 * sizeof(GLfloat)));
vbo->release();
}
void DrawableTerrain::initGL()
{
m_vao_constraints.create(); CE();
m_vbo_constraints.create(); CE();
m_ibo_constraints.create(); CE();
m_vao_constraints.bind(); CE();
m_vbo_constraints.bind(); CE();
m_vbo_constraints.setUsagePattern(QOpenGLBuffer::UsagePattern::StaticDraw); CE();
m_ibo_constraints.bind(); CE();
m_ibo_constraints.setUsagePattern(QOpenGLBuffer::UsagePattern::StaticDraw); CE();
QOpenGLFunctions * f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0); CE();
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)(0)); CE();
// Texture coordinate
// f->glEnableVertexAttribArray(1); CE();
// const int sz = 3*sizeof(GLfloat);
// f->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5*sizeof(GLfloat), (void*)(sz)); CE();
m_vao_constraints.release(); CE();
m_vbo_constraints.release(); CE();
m_ibo_constraints.release(); CE();
fillBuffers();
}
void ScreenAlignedQuad::draw(QOpenGLFunctions &gl)
{
m_vertices->bind();
gl.glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(float) * 0, nullptr);
gl.glEnableVertexAttribArray(0);
gl.glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
void GLShaderTextured::draw(unsigned int mode, const QMatrix4x4& transformMatrix, GLfloat *textureCoords, GLfloat *vertices, int nbVertices)
{
if (!m_texture) {
qDebug("GLShaderTextured::draw: no texture defined. Doing nothing");
return;
}
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
m_program->bind();
m_program->setUniformValue(m_matrixLoc, transformMatrix);
m_texture->bind();
m_program->setUniformValue(m_textureLoc, 0); // Use texture unit 0 which magically contains our texture
f->glEnableVertexAttribArray(0); // vertex
f->glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, vertices);
f->glEnableVertexAttribArray(1); // texture coordinates
f->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, textureCoords);
f->glDrawArrays(mode, 0, nbVertices);
f->glDisableVertexAttribArray(0);
m_program->release();
}
void Grid::initVertexArray()
{
vao.create();
vao.bind();
vbo.bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
vbo.release();
vao.release();
}
void OpenGLVideo::render(const QRectF &target, const QRectF& roi, const QMatrix4x4& transform)
{
DPTR_D(OpenGLVideo);
Q_ASSERT(d.manager);
VideoShader *shader = d.manager->prepareMaterial(d.material);
shader->update(d.material);
shader->program()->setUniformValue(shader->matrixLocation(), transform*d.matrix);
// uniform end. attribute begin
if (target.isValid())
d.geometry.setRect(target, d.material->normalizedROI(roi));
else
d.geometry.setRect(d.rect, d.material->normalizedROI(roi));
// normalize?
#if 1
shader->program()->setAttributeArray(0, GL_FLOAT, d.geometry.data(0), 2, d.geometry.stride());
shader->program()->setAttributeArray(1, GL_FLOAT, d.geometry.data(1), 2, d.geometry.stride());
#else
#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
static QGLFunctions *glf = new QGLFunctions();
glf->initializeGLFunctions();
#else
QOpenGLFunctions *glf = QOpenGLContext::currentContext()->functions();
#endif
glf->glVertexAttribPointer(0, 2, GL_FLOAT, GL_TRUE, d.geometry.stride(), d.geometry.data(0));
glf->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, d.geometry.stride(), d.geometry.data(1));
#endif
char const *const *attr = shader->attributeNames();
for (int i = 0; attr[i]; ++i) {
shader->program()->enableAttributeArray(i); //TODO: in setActiveShader
}
glDrawArrays(d.geometry.mode(), 0, d.geometry.vertexCount());
// d.shader->program()->release(); //glUseProgram(0)
for (int i = 0; attr[i]; ++i) {
shader->program()->disableAttributeArray(i); //TODO: in setActiveShader
}
d.material->unbind();
}
QOpenGLBuffer* GLImageProcessor::buildQuadTextured() const
{
QOpenGLBuffer* lpvbo = new QOpenGLBuffer();
typedef struct
{
float xyz[3];
float uv[2];
} VertexUV;
VertexUV Vertices[] =
{
{ { -1.0f, -1.0f, 0.0f }, { 0.0f, 0.0f } },
{ { -1.0f, 1.0f, 0.0f }, { 0.0f, 1.0f } },
{ { 1.0f, 1.0f, 0.0f }, { 1.0f, 1.0f } },
{ { 1.0f, -1.0f, 0.0f }, { 1.0f, 0.0f } }
};
const size_t BufferSize = sizeof(Vertices);
const size_t VertexSize = sizeof(Vertices[0]);
const size_t UVOffset = sizeof(Vertices[0].xyz);
// Setup our vertex buffer object.
lpvbo->create();
lpvbo->bind();
lpvbo->allocate(Vertices, BufferSize);
lpvbo->bind();
QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glEnableVertexAttribArray(1);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, VertexSize, 0);
f->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, VertexSize, reinterpret_cast<void *>(UVOffset));
lpvbo->release();
return lpvbo;
}
void GlCircle::initGL()
{
m_vao_constraints.create();
m_vbo_constraints.create();
m_ibo_constraints.create();
m_vao_constraints.bind(); CE();
m_vbo_constraints.bind(); CE();
m_vbo_constraints.setUsagePattern(QOpenGLBuffer::UsagePattern::StaticDraw); CE();
m_ibo_constraints.bind(); CE();
m_ibo_constraints.setUsagePattern(QOpenGLBuffer::UsagePattern::StaticDraw); CE();
QOpenGLFunctions * f = QOpenGLContext::currentContext()->functions();
f->glEnableVertexAttribArray(0);
f->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)(0));
m_vao_constraints.release(); CE();
m_vbo_constraints.release(); CE();
m_ibo_constraints.release(); CE();
fillBuffers();
}
void QtViewRenderer::initialize()
{
QOpenGLFunctions* f = QOpenGLContext::currentContext()->functions();
unsigned char* pixels;
int width, height;
m_atlas->getTexDataAsRGBA32(&pixels, &width, &height);
QImage img(pixels, width, height, QImage::Format::Format_ARGB32);
m_fontTexture = std::make_unique<QOpenGLTexture>(img);
m_atlas->setTexID(m_fontTexture->textureId());
const GLchar* vertex_shader =
"#version 330\n"
"uniform mat4 ProjMtx;\n"
"layout (location = 0) in vec2 Position;\n"
"layout (location = 1) in vec2 UV;\n"
"layout (location = 2) in vec4 Color;\n"
"out vec2 Frag_UV;\n"
"out vec4 Frag_Color;\n"
"void main()\n"
"{\n"
" Frag_UV = UV;\n"
" Frag_Color = Color;\n"
" gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
"}\n";
const GLchar* fragment_shader =
"#version 330\n"
"uniform sampler2D Texture;\n"
"in vec2 Frag_UV;\n"
"in vec4 Frag_Color;\n"
"out vec4 Out_Color;\n"
"void main()\n"
"{\n"
" Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n"
"}\n";
m_shader = std::make_unique<QOpenGLShaderProgram>();
m_shader->addShaderFromSourceCode(QOpenGLShader::ShaderTypeBit::Vertex, vertex_shader);
m_shader->addShaderFromSourceCode(QOpenGLShader::ShaderTypeBit::Fragment, fragment_shader);
m_shader->link();
m_locationTex = m_shader->uniformLocation("Texture");
m_locationProjMtx = m_shader->uniformLocation("ProjMtx");
m_VAO = std::make_unique<QOpenGLVertexArrayObject>();
m_VAO->create();
m_VAO->bind();
m_VBO = std::make_unique<QOpenGLBuffer>(QOpenGLBuffer::VertexBuffer);
m_VBO->create();
m_VBO->setUsagePattern(QOpenGLBuffer::StreamDraw);
m_VBO->bind();
f->glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(DrawList::DrawVert), (GLvoid*)offsetof(DrawList::DrawVert, pos));
f->glEnableVertexAttribArray(0);
f->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(DrawList::DrawVert), (GLvoid*)offsetof(DrawList::DrawVert, uv));
f->glEnableVertexAttribArray(1);
f->glVertexAttribPointer(2, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(DrawList::DrawVert), (GLvoid*)offsetof(DrawList::DrawVert, col));
f->glEnableVertexAttribArray(2);
m_VBO->release();
m_EBO = std::make_unique<QOpenGLBuffer>(QOpenGLBuffer::IndexBuffer);
m_EBO->create();
m_EBO->setUsagePattern(QOpenGLBuffer::StreamDraw);
m_VAO->release();
}
void QSGDistanceFieldGlyphCache::saveTexture(GLuint textureId, int width, int height) const
{
QOpenGLFunctions *functions = QOpenGLContext::currentContext()->functions();
GLuint fboId;
functions->glGenFramebuffers(1, &fboId);
GLuint tmpTexture = 0;
functions->glGenTextures(1, &tmpTexture);
functions->glBindTexture(GL_TEXTURE_2D, tmpTexture);
functions->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
functions->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
functions->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
functions->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
functions->glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
functions->glBindTexture(GL_TEXTURE_2D, 0);
functions->glBindFramebuffer(GL_FRAMEBUFFER_EXT, fboId);
functions->glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D,
tmpTexture, 0);
functions->glActiveTexture(GL_TEXTURE0);
functions->glBindTexture(GL_TEXTURE_2D, textureId);
functions->glDisable(GL_STENCIL_TEST);
functions->glDisable(GL_DEPTH_TEST);
functions->glDisable(GL_SCISSOR_TEST);
functions->glDisable(GL_BLEND);
GLfloat textureCoordinateArray[8];
textureCoordinateArray[0] = 0.0f;
textureCoordinateArray[1] = 0.0f;
textureCoordinateArray[2] = 1.0f;
textureCoordinateArray[3] = 0.0f;
textureCoordinateArray[4] = 1.0f;
textureCoordinateArray[5] = 1.0f;
textureCoordinateArray[6] = 0.0f;
textureCoordinateArray[7] = 1.0f;
GLfloat vertexCoordinateArray[8];
vertexCoordinateArray[0] = -1.0f;
vertexCoordinateArray[1] = -1.0f;
vertexCoordinateArray[2] = 1.0f;
vertexCoordinateArray[3] = -1.0f;
vertexCoordinateArray[4] = 1.0f;
vertexCoordinateArray[5] = 1.0f;
vertexCoordinateArray[6] = -1.0f;
vertexCoordinateArray[7] = 1.0f;
functions->glViewport(0, 0, width, height);
functions->glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinateArray);
functions->glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray);
{
static const char *vertexShaderSource =
"attribute vec4 vertexCoordsArray; \n"
"attribute vec2 textureCoordArray; \n"
"varying vec2 textureCoords; \n"
"void main(void) \n"
"{ \n"
" gl_Position = vertexCoordsArray; \n"
" textureCoords = textureCoordArray; \n"
"} \n";
static const char *fragmentShaderSource =
"varying vec2 textureCoords; \n"
"uniform sampler2D texture; \n"
"void main() \n"
"{ \n"
" gl_FragColor = texture2D(texture, textureCoords); \n"
"} \n";
GLuint vertexShader = functions->glCreateShader(GL_VERTEX_SHADER);
GLuint fragmentShader = functions->glCreateShader(GL_FRAGMENT_SHADER);
if (vertexShader == 0 || fragmentShader == 0) {
GLenum error = functions->glGetError();
qWarning("QSGDistanceFieldGlyphCache::saveTexture: Failed to create shaders. (GL error: %x)",
error);
return;
}
functions->glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
functions->glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
functions->glCompileShader(vertexShader);
GLint len = 1;
functions->glGetShaderiv(vertexShader, GL_INFO_LOG_LENGTH, &len);
char infoLog[2048];
functions->glGetShaderInfoLog(vertexShader, 2048, NULL, infoLog);
if (qstrlen(infoLog) > 0)
qWarning("Problems compiling vertex shader:\n %s", infoLog);
functions->glCompileShader(fragmentShader);
functions->glGetShaderInfoLog(fragmentShader, 2048, NULL, infoLog);
if (qstrlen(infoLog) > 0)
qWarning("Problems compiling fragment shader:\n %s", infoLog);
GLuint shaderProgram = functions->glCreateProgram();
functions->glAttachShader(shaderProgram, vertexShader);
functions->glAttachShader(shaderProgram, fragmentShader);
functions->glBindAttribLocation(shaderProgram, 0, "vertexCoordsArray");
functions->glBindAttribLocation(shaderProgram, 1, "textureCoordArray");
functions->glLinkProgram(shaderProgram);
functions->glGetProgramInfoLog(shaderProgram, 2048, NULL, infoLog);
if (qstrlen(infoLog) > 0)
qWarning("Problems linking shaders:\n %s", infoLog);
functions->glUseProgram(shaderProgram);
functions->glEnableVertexAttribArray(0);
functions->glEnableVertexAttribArray(1);
int textureUniformLocation = functions->glGetUniformLocation(shaderProgram, "texture");
functions->glUniform1i(textureUniformLocation, 0);
}
functions->glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
{
GLenum error = functions->glGetError();
if (error != GL_NO_ERROR)
qWarning("glDrawArrays reported error 0x%x", error);
}
uchar *data = new uchar[width * height * 4];
functions->glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data);
QImage image(data, width, height, QImage::Format_ARGB32);
QByteArray fileName = m_referenceFont.familyName().toLatin1() + '_' + QByteArray::number(textureId);
fileName = fileName.replace('/', '_').replace(' ', '_') + ".png";
image.save(QString::fromLocal8Bit(fileName));
{
GLenum error = functions->glGetError();
if (error != GL_NO_ERROR)
qWarning("glReadPixels reported error 0x%x", error);
}
functions->glDisableVertexAttribArray(0);
functions->glDisableVertexAttribArray(1);
functions->glDeleteFramebuffers(1, &fboId);
functions->glDeleteTextures(1, &tmpTexture);
delete[] data;
}