vertex-buffer

I have been working on an animated graphics project with very specific requirements, and after quite a bit of searching and test coding, I have figured that I could take several approaches, but the Khronos and MDN documentation I have been reading coupled with other posts I have seen here don't answer all of my questions regarding my particular project. In the meantime, I have written short test programs (setting infrastructure for testing). Firstly, I should describe the project: The main object drawn to the screen is a simple quad surrounded by a black outline (LINE_LOOP or LINES will do,

Thus far i have only used glDrawArrays and would like to move over to using an index buffer and indexed triangles. I am drawing a somewhat complicated object with texture coords, normals and vertex coords. All this data is gathered into a single interleaved vertex buffer and drawn using calls similar to ( Assuming all the serup is done correctly ): glVertexPointer( 3, GL_FLOAT, 22, (char*)m_vertexData ); glNormalPointer( GL_SHORT, 22, (char*)m_vertexData+(12) ); glTexCoordPointer( 2, GL_SHORT, 22, (char*)m_vertexData+(18) ); glDrawElements(GL_TRIANGLES, m_numTriangles, GL_UNSIGNED_SHORT, m

I am developing an iPhone game using OpenGL ES 1.1 and need to use vertex buffer objects in order to render 500+ particles without the performance decreasing. My game was able to draw successfully using the non-VBO method, but now that I've attempted to incorporate VBOs, nothing is drawing anymore. Please help me to identify what I am doing wrong and provide a correct example. I have a class called TexturedQuad which consists of the following: // TexturedQuad.h enum { ATTRIB_POSITION, ATTRIB_TEXTURE_COORD }; @interface TexturedQuad : NSObject { GLfloat *textureCoords; // 8 elements for 4

I have OpenGL rendering code calling glDrawArrays that works flawlessly when the OpenGL context is (automatically / implicitly obtained) 4.2 but fails consistently (GL_INVALID_OPERATION) with an explicitly requested OpenGL core context 3.2. (Shaders are always set to #version 150 in both cases but that's beside the point here I suspect.) According to specs, there are only two instances when glDrawArrays() fails with GL_INVALID_OPERATION: "if a non-zero buffer object name is bound to an enabled array and the buffer object's data store is currently mapped" -- I'm not doing any buffer mapping at

I'm trying to draw a terrain with GL_TRIANGLE_STRIP and glDrawElements but I'm having a really hard time understanding the indices thing behind glDrawElements ... Here's what I have so far: void Terrain::GenerateVertexBufferObjects(float ox, float oy, float oz) { float startWidth, startLength, *vArray; int vCount, vIndex = -1; // width = length = 256 startWidth = (width / 2.0f) - width; startLength = (length / 2.0f) - length; vCount = 3 * width * length; vArray = new float[vCount]; for(int z = 0; z < length; z++) { // vIndex == vIndex + width * 3 || width * 3 = 256 * 3 = 768 for(int x = 0; x <

I don't understand what the purpose is of binding points (such as GL_ARRAY_BUFFER ) in OpenGL. To my understanding glGenBuffers() creates a sort of pointer to a vertex buffer object located somewhere within GPU memory. So: glGenBuffers(1, &bufferID) means I now have a handle, bufferID, to 1 vertex object on the graphics card. Now I know the next step would be to bind bufferID to a binding point glBindBuffer(GL_ARRAY_BUFFER, bufferID) so that I can use that binding point to send data down using the glBufferData() function like so: glBufferData(GL_ARRAY_BUFFER, sizeof(data), data, GL_STATIC_DRAW