Open GL ES2.0 - glDrawelements()

akhil

I am not able to use glDrawElements() command properly. I have checked with my buffers( both vertex and index) with my vertex and index data. Both come out to be same. And what i feel is that the main problem lies in drawing the object. I am giving my code below. Can anyone point the mistake.

@void GLWindow::paintGL() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear the background and depth-buffer for this frame

GLuint vertexAttr = m_sampleProgram.attributeLocation("vertex");
GLuint normalAttr = m_sampleProgram.attributeLocation("normal");
GLuint texAttr = m_sampleProgram.attributeLocation("texCoord");
GLuint matrixAttr = m_sampleProgram.uniformLocation("matrix");
GLuint projAttr = m_sampleProgram.uniformLocation("proj");

m_sampleProgram.bind();
vertexBuffer.bind();
indexBuffer.bind();

m_sampleProgram.enableAttributeArray(vertexAttr);
m_sampleProgram.setAttributeBuffer(vertexAttr, GL_FLOAT, 0 * sizeof(GLfloat), 3, 5 * sizeof(GLfloat));
m_sampleProgram.enableAttributeArray(texAttr);
m_sampleProgram.setAttributeBuffer(texAttr,    GL_FLOAT, 3 * sizeof(GLfloat), 2, 6 * sizeof(GLfloat));
m_sampleProgram.enableAttributeArray(normalAttr);
m_sampleProgram.setAttributeBuffer(normalAttr, GL_FLOAT, 5 * sizeof(GLfloat), 3, 5 * sizeof(GLfloat));

QMatrix4x4 projection;
projection.perspective(45.0f, (float)width()/(float)height(), 0.01f, 1000.0f );    // Use perspective projection


m_sampleProgram.setUniformValue( projAttr, projection );                        // Set projection to the shader

// Orientation for the &lt;object&gt; we are about to render
QMatrix4x4 orientation;
orientation.setToIdentity();
orientation.translate(0.0f, 0.0f, -10.0f );                                      // 5 units away from camera
static float ang = 0.0f;
ang+=0.1f;
orientation.rotate(ang, 1.0f, 0.0f, 0.0f );
orientation.rotate(ang*0.7f, 0.0f, 1.0f, 0.0f );
orientation.rotate(ang*1.4f, 0.0f, 0.0f, 1.0f );
m_sampleProgram.setUniformValue( matrixAttr, orientation );                     // Set orientation to the shader

glEnable(GL_DEPTH_TEST);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glDrawElements(GL_TRIANGLES, faceCount, GL_UNSIGNED_SHORT, 0);          // draw the 3d &lt;object&gt;

m_sampleProgram.disableAttributeArray(vertexAttr);                              // Disable the program
m_sampleProgram.disableAttributeArray(texAttr);
m_sampleProgram.disableAttributeArray(normalAttr);

vertexBuffer.release();
indexBuffer.release();

m_sampleProgram.release();
swapBuffers();                                                                  // Swap buffers manually since automatic swapping was disabled in a constructor.

};

@

minimoog77

@m_sampleProgram.enableAttributeArray(vertexAttr);
m_sampleProgram.setAttributeBuffer(vertexAttr, GL_FLOAT, 0 * sizeof(GLfloat), 3, 5 * sizeof(GLfloat));
m_sampleProgram.enableAttributeArray(texAttr);
m_sampleProgram.setAttributeBuffer(texAttr, GL_FLOAT, 3 * sizeof(GLfloat), 2, 6 * sizeof(GLfloat));
m_sampleProgram.enableAttributeArray(normalAttr);
m_sampleProgram.setAttributeBuffer(normalAttr, GL_FLOAT, 5 * sizeof(GLfloat), 3, 5 * sizeof(GLfloat));@

Looks like vertex strides are wrong.