Call glGenFramebuffers to generate a frame buffer object.The shader pipeline can render into texture buffers (pixmaps) or render buffer objects and use those buffers in future shader passes. Other buffers include pixel buffers and maps, like textures. GlBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(int) * CUBE_INDICES, renderer->vertexIndices, GL_STATIC_DRAW) GlBindBuffer(GL_ELEMENT_ARRAY_BUFFER, renderer->indexBuffer) GlBufferData(GL_ARRAY_BUFFER, sizeof(Vertex) * CUBE_VERTICES, renderer->vertices, GL_STATIC_DRAW) GlBindBuffer(GL_ARRAY_BUFFER, renderer->vertexBuffer) glGenBuffers(1, &renderer->vertexBuffer) OpenGL ES 2.0: Creating and populating a vertex buffer and an index buffer.
Here's an example a vertex buffer and an index buffer created with OpenGL ES 2.0: (In Direct3D 11 as well as OpenGL ES 2.0 it is inefficient to have multiple vertex buffers per draw call.) The buffer contains a contiguous list of these vertices, in some order (like a triangle list, or strip, or fan), and which collectively represent the visible polygons in your scene. In typical use, a vertex is represented by a structure that contains the position coordinates, a normal vector to the vertex position, a tangent vector to the vertex position, and texture lookup (uv) coordinates. The most common kind of buffer is the vertex buffer, which minimally contains the positions of the vertices in some coordinate system. Call glBufferData to populate the buffer with specific data (such as vertex structures, index data, or color data) in a specific layout.Call glBindBuffer to define the layout of a buffer, such as GL_ELEMENT_ARRAY_BUFFER.Call glGenBuffers to generate one or more buffers and return the handles to them.In OpenGL ES 2.0, the process for creating and binding any kind of buffer generally follows this pattern Swap chain with "back buffer" surface See IDXGISwapChain1 with attached IDXGISurface1. Render target(s) See ID3D11RenderTargetView with ID3D11Texture2D. Vertex buffer element field, designated by an input layout and marked with a specific HLSL semantic.īuffer See D3D11_SUBRESOURCE_DATA and D3D11_BUFFER_DESC and for a general-use buffer definitions. Despite the superficial commonality, they are handled quite different in usage.
In Direct3D 11, these roughly map to constant buffers, vertex buffers, and subresources. In OpenGL ES 2.0, data is passed to and from shader programs in four ways: as uniforms for constant data, as attributes for vertex data, as buffer objects for other resource data (such as textures). During the process of porting to Direct3D 11 from OpenGL ES 2.0, you must change the syntax and API behavior for passing data between the app and the shader programs.
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