c++ - QOpenGLWidget using QOpenGLBuffer doesn't work -


i want replace demo project of box2d vs qt. because qt have opengl wrappers , use gles instead standard opengl rewrote source code of project qopengl wrappers (change opengl 3.1.0 , glsl 1.40 gles 2.0 , glsl gles 2.0), this:

struct glrenderpoints {     void  create(mainopenglwidget *widget)     {         const char *vs = \                         "#ifdef gl_es\r\n"                         "precision lowp float;\r\n"                         "#endif\r\n"                         "uniform mat4 projectionmatrix;\n"                         "attribute vec2 v_position;\n"                         "attribute vec4 v_color;\n"                         "attribute float v_size;\n"                         "varying vec4 f_color;\n"                         "void main(void)\n"                         "{\n"                         "   f_color = v_color;\n"                         "   gl_position = projectionmatrix * vec4(v_position, 0.0, 1.0);\n"                         "      gl_pointsize = v_size;\n"                         "}\n";          const char *fs = \                         "#ifdef gl_es\r\n"                         "precision lowp float;\r\n"                         "#endif\r\n"                         "varying vec4 f_color;\n"                         "vec4 color;\n"                         "void main(void)\n"                         "{\n"                         "   color = f_color;\n"                         "}\n";          m_widget = widget;          m_program.addshaderfromsourcecode(qopenglshader::vertex, vs);         m_program.addshaderfromsourcecode(qopenglshader::fragment, fs);          m_vertexattribute = 0;         m_program.bindattributelocation("v_position", m_vertexattribute);         m_colorattribute = 1;         m_program.bindattributelocation("v_color", m_colorattribute);         m_sizeattribute = 2;         m_program.bindattributelocation("v_size", m_sizeattribute);          m_program.link();         m_projectionuniform = m_program.uniformlocation("projectionmatrix");          m_vbo = qopenglbuffer(qopenglbuffer::vertexbuffer);         if (m_vbo.create()) {             m_vbo.setusagepattern(qopenglbuffer::dynamicdraw);          }          m_cbo = qopenglbuffer(qopenglbuffer::vertexbuffer);         if (m_cbo.create()) {             m_cbo.setusagepattern(qopenglbuffer::dynamicdraw);         }          m_sbo = qopenglbuffer(qopenglbuffer::vertexbuffer);         if (m_sbo.create()) {             m_sbo.setusagepattern(qopenglbuffer::dynamicdraw);         }          m_count = 0;     }      void flush(qopenglfunctions *m_functions)     {         if (m_count == 0)             return;          m_program.bind();          qmatrix4x4 m_modelview =             m_widget->buildprojectionmatrix(0.0f);          m_program.setuniformvalue(m_projectionuniform, m_modelview);          m_vbo.bind();         m_vbo.allocate(m_vertices, m_count);         m_vbo.write(0, m_vertices, m_count * sizeof(b2vec2));         m_program.enableattributearray(m_vertexattribute);         m_program.setattributebuffer(m_vertexattribute, gl_float, 0, 2);          m_cbo.bind();         m_cbo.allocate(m_colors, m_count);         m_cbo.write(0, m_colors, m_count * sizeof(b2color));         m_program.enableattributearray(m_colorattribute);         m_program.setattributebuffer(m_colorattribute, gl_float, 0, 4);           m_sbo.bind();         m_sbo.allocate(m_sizes, m_count);         m_sbo.write(0, m_sizes, m_count * sizeof(float32));         m_program.enableattributearray(m_sizeattribute);         m_program.setattributebuffer(m_sizeattribute, gl_float, 0, 1);          m_functions->glenable(gl_program_point_size);         m_functions->gldrawarrays(gl_points, 0, m_count);         m_functions->gldisable(gl_program_point_size);          m_vbo.release();         m_sbo.release();         m_cbo.release();          m_program.release();          m_count = 0;     }      enum { e_maxvertices = 512 };     b2vec2 m_vertices[e_maxvertices];     b2color m_colors[e_maxvertices];     float32 m_sizes[e_maxvertices];      int32 m_count;      qopenglbuffer m_vbo;     qopenglbuffer m_cbo;     qopenglbuffer m_sbo;      qopenglshaderprogram m_program;     mainopenglwidget *m_widget;      glint m_projectionuniform;     glint m_vertexattribute;     glint m_colorattribute;     glint m_sizeattribute; };

but when call flush in paintgl method of widget see nothing. wrong code? don't understand problem is. shader code, or work qopenglbuffer's.


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