C++ QOpenGLFunctions::glEnable方法代码示例

void Renderer::render()
{
    QMutexLocker locker(&m_windowLock);

    if (m_windows.isEmpty())
        return;

    HelloWindow *surface = m_windows.at(m_currentWindow);
    QColor color = surface->color();

    m_currentWindow = (m_currentWindow + 1) % m_windows.size();

    if (!m_context->makeCurrent(surface))
        return;

    QSize viewSize = surface->size();

    locker.unlock();

    if (!m_initialized) {
        initialize();
        m_initialized = true;
    }

    QOpenGLFunctions *f = m_context->functions();
    f->glViewport(0, 0, viewSize.width() * surface->devicePixelRatio(), viewSize.height() * surface->devicePixelRatio());
    f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    f->glClearColor(m_backgroundColor.redF(), m_backgroundColor.greenF(), m_backgroundColor.blueF(), m_backgroundColor.alphaF());
    f->glFrontFace(GL_CW);
    f->glCullFace(GL_FRONT);
    f->glEnable(GL_CULL_FACE);
    f->glEnable(GL_DEPTH_TEST);

    m_program->bind();
    m_vbo.bind();

    m_program->enableAttributeArray(vertexAttr);
    m_program->enableAttributeArray(normalAttr);
    m_program->setAttributeBuffer(vertexAttr, GL_FLOAT, 0, 3);
    const int verticesSize = vertices.count() * 3 * sizeof(GLfloat);
    m_program->setAttributeBuffer(normalAttr, GL_FLOAT, verticesSize, 3);

    QMatrix4x4 modelview;
    modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f);
    modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f);
    modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f);
    modelview.translate(0.0f, -0.2f, 0.0f);

    m_program->setUniformValue(matrixUniform, modelview);
    m_program->setUniformValue(colorUniform, color);

    m_context->functions()->glDrawArrays(GL_TRIANGLES, 0, vertices.size());

    m_context->swapBuffers(surface);

    m_fAngle += 1.0f;

    QTimer::singleShot(0, this, SLOT(render()));
}

void QtRenderer::initialize()
{
    QOpenGLShader *vshader = new QOpenGLShader(QOpenGLShader::Vertex, this);
    vshader->compileSourceCode(
        "attribute highp vec4 vertex;"
        "attribute mediump vec3 normal;"
        "uniform mediump mat4 matrix;"
        "uniform lowp vec4 sourceColor;"
        "varying mediump vec4 color;"
        "void main(void)"
        "{"
        "    vec3 toLight = normalize(vec3(0.0, 0.3, 1.0));"
        "    float angle = max(dot(normal, toLight), 0.0);"
        "    vec3 col = sourceColor.rgb;"
        "    color = vec4(col * 0.2 + col * 0.8 * angle, 1.0);"
        "    color = clamp(color, 0.0, 1.0);"
        "    gl_Position = matrix * vertex;"
        "}");

    QOpenGLShader *fshader = new QOpenGLShader(QOpenGLShader::Fragment, this);
    fshader->compileSourceCode(
        "varying mediump vec4 color;"
        "void main(void)"
        "{"
        "    gl_FragColor = color;"
        "}");

    m_program = new QOpenGLShaderProgram(this);
    m_program->addShader(vshader);
    m_program->addShader(fshader);
    m_program->link();
    m_program->bind();

    vertexAttr = m_program->attributeLocation("vertex");
    normalAttr = m_program->attributeLocation("normal");
    matrixUniform = m_program->uniformLocation("matrix");
    colorUniform = m_program->uniformLocation("sourceColor");

    m_fAngle = 0;
    createGeometry();

    m_vbo.create();
    m_vbo.bind();
    const int verticesSize = vertices.count() * 3 * sizeof(GLfloat);
    m_vbo.allocate(verticesSize * 2);
    m_vbo.write(0, vertices.constData(), verticesSize);
    m_vbo.write(verticesSize, normals.constData(), verticesSize);

    QOpenGLFunctions *f = m_context->functions();
    f->glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
    f->glFrontFace(GL_CW);
    f->glCullFace(GL_FRONT);
    f->glEnable(GL_CULL_FACE);
    f->glEnable(GL_DEPTH_TEST);

    m_program->enableAttributeArray(vertexAttr);
    m_program->enableAttributeArray(normalAttr);
    m_program->setAttributeBuffer(vertexAttr, GL_FLOAT, 0, 3);
    m_program->setAttributeBuffer(normalAttr, GL_FLOAT, verticesSize, 3);
}

void Renderer::render()
{
    QMutexLocker locker(&m_windowLock);

    if (m_windows.isEmpty())
        return;

    HelloWindow *surface = m_windows.at(m_currentWindow);
    QColor color = surface->color();

    m_currentWindow = (m_currentWindow + 1) % m_windows.size();

    if (!m_context->makeCurrent(surface))
        return;

    QSize viewSize = surface->size();

    locker.unlock();

    if (!m_initialized) {
        initialize();
        m_initialized = true;
    }

    QOpenGLFunctions *f = m_context->functions();
    f->glViewport(0, 0, viewSize.width() * surface->devicePixelRatio(), viewSize.height() * surface->devicePixelRatio());

    f->glClearColor(0.1f, 0.1f, 0.2f, 1.0f);
    f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    f->glFrontFace(GL_CW);
    f->glCullFace(GL_FRONT);
    f->glEnable(GL_CULL_FACE);
    f->glEnable(GL_DEPTH_TEST);

    QMatrix4x4 modelview;
    modelview.rotate(m_fAngle, 0.0f, 1.0f, 0.0f);
    modelview.rotate(m_fAngle, 1.0f, 0.0f, 0.0f);
    modelview.rotate(m_fAngle, 0.0f, 0.0f, 1.0f);
    modelview.translate(0.0f, -0.2f, 0.0f);

    m_program->bind();
    m_program->setUniformValue(matrixUniform, modelview);
    m_program->setUniformValue(colorUniform, color);
    paintQtLogo();
    m_program->release();

    f->glDisable(GL_DEPTH_TEST);
    f->glDisable(GL_CULL_FACE);

    m_context->swapBuffers(surface);

    m_fAngle += 1.0f;

    QTimer::singleShot(0, this, SLOT(render()));
}

void ShaderEffectSource::bind()
{
    GLint filtering = smooth() ? GL_LINEAR : GL_NEAREST;
    GLuint hwrap = (m_wrapMode == Repeat || m_wrapMode == RepeatHorizontally) ? GL_REPEAT : GL_CLAMP_TO_EDGE;
    GLuint vwrap = (m_wrapMode == Repeat || m_wrapMode == RepeatVertically) ? GL_REPEAT : GL_CLAMP_TO_EDGE;

    QOpenGLContext *context = QOpenGLContext::currentContext();
    QOpenGLFunctions *f = context->functions();
    if (!context->isOpenGLES())
        f->glEnable(GL_TEXTURE_2D);

    if (m_fbo && m_fbo->isValid()) {
        f->glBindTexture(GL_TEXTURE_2D, m_fbo->texture());
    } else {
        m_dirtyTexture = true;
        emit repaintRequired();
        markSourceItemDirty();
        f->glBindTexture(GL_TEXTURE_2D, 0);
    }

    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filtering);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, smooth() ? GL_LINEAR : GL_NEAREST);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, hwrap);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, vwrap);
}

void GLTerrainRect::render()
{
    if(!initalised())
        initGL();

    QOpenGLFunctions * f = QOpenGLContext::currentContext()->functions();

    f->glEnable(GL_BLEND);CE();
    f->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);CE();

    m_vao_constraints.bind();CE();
    f->glDrawElements(GL_TRIANGLE_STRIP, m_indicies.size(), GL_UNSIGNED_INT, (void*)(0)); CE();CE();
    m_vao_constraints.release();CE();

    f->glDisable(GL_BLEND);CE();
}

void Shader::updateState(const RenderState &state, QSGMaterial *newMaterial, QSGMaterial *oldMaterial)
{
    Q_UNUSED(oldMaterial);
    Q_ASSERT(program()->isLinked());

    Material* m = static_cast<Material*>(newMaterial);
    program()->setUniformValue(m_id_matrix, state.combinedMatrix()*m->transformation);

    if (state.isOpacityDirty()) {
        program()->setUniformValue(m_id_opacity, state.opacity());
    }

    program()->setUniformValue(m_id_color, m->color);

    m_glFuncs->glBlendFunc(GL_ONE, GL_ONE);
    m_glFuncs->glEnable(GL_POINT_SPRITE);
    // glPointSize(m->pointSize); // Commenting this out since it is not available in QOpenGLFunctions (OpenGL ES 2.0) and apparently does not affect the point size
}

void QtViewRenderer::render()
{
	QOpenGLFunctions* f = QOpenGLContext::currentContext()->functions();
	OpenGLStateSaver state(f);

	f->glEnable(GL_BLEND);
	f->glBlendEquation(GL_FUNC_ADD);
	f->glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	f->glDisable(GL_CULL_FACE);
	f->glDisable(GL_DEPTH_TEST);
	f->glActiveTexture(GL_TEXTURE0);

	glClearColor(m_clearColor[0], m_clearColor[1], m_clearColor[2], 1.0);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glViewport(0, 0, m_width, m_height);
	QMatrix4x4 ortho;
	ortho.ortho(m_viewBounds[0], m_viewBounds[2], m_viewBounds[3], m_viewBounds[1], -1, 1);

	m_shader->bind();
	m_shader->setUniformValue(m_locationTex, 0);
	m_shader->setUniformValue(m_locationProjMtx, ortho);

	m_VAO->bind();

	int vboSize = 0, eboSize = 0;
	for (const auto cmd_list : m_drawLists)
	{
		if (cmd_list->vtxBuffer().empty() || cmd_list->idxBuffer().empty())
			continue;

		const DrawList::DrawIdx* idx_buffer_offset = nullptr;

		m_VBO->bind();
		int vtxSize = cmd_list->vtxBuffer().size() * sizeof(DrawList::DrawVert);
		if (vtxSize > vboSize)
		{
			m_VBO->allocate(vtxSize);
			vboSize = vtxSize;
		}
		m_VBO->write(0, &cmd_list->vtxBuffer().front(), vtxSize);

		m_EBO->bind();
		int idxSize = cmd_list->idxBuffer().size() * sizeof(DrawList::DrawIdx);
		if (idxSize > eboSize)
		{
			m_EBO->allocate(idxSize);
			eboSize = idxSize;
		}
		m_EBO->write(0, &cmd_list->idxBuffer().front(), idxSize);

		for (const auto& pcmd : cmd_list->cmdBuffer())
		{
			glBindTexture(GL_TEXTURE_2D, pcmd.textureId);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

			glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(pcmd.elemCount), GL_UNSIGNED_INT, idx_buffer_offset);
			idx_buffer_offset += pcmd.elemCount;
		}
	}

	m_shader->release();
	m_VAO->release();
}