These examples describe common use cases such as transforming a vertex position with a model view and projection matrix, vertex lighting that generates per-vertex diffuse and specular colors, texture coordinate generation, vertex skinning, and displacement mapping. We then describe how to write vertex shaders by discussing a few examples. In this chapter, we begin with a high-level overview of a vertex shader, including its inputs and outputs. Chapter 7, “ Primitive Assembly and Rasterization,” discussed how the output of the vertex shader, referred to as vertex shader output variables, is used by the rasterization stage to generate per-fragment values, which are then input to the fragment shader. The previous chapters-specifically, Chapter 5, “ OpenGL ES Shading Language,” and Chapter 6, “ Vertex Attributes, Vertex Arrays, and Buffer Objects”-discussed how to specify the vertex attribute and uniform inputs and also gave a good description of the OpenGL ES 3.0 Shading Language.

Vertex shaders can be used to do traditional vertex-based operations such as transforming the position by a matrix, computing the lighting equation to generate a per-vertex color, and generating or transforming texture coordinates.įigure 8-1 OpenGL ES 3.0 Programmable Pipeline In this chapter, we discuss the vertex shader stage. The shaded boxes indicate the programmable stages in OpenGL ES 3.0. Figure 8-1 illustrates the entire OpenGL ES 3.0 programmable pipeline. This chapter describes the OpenGL ES 3.0 programmable vertex pipeline. OpenGL ES 3.0: Programming Guide, Second Edition (2014) Chapter 8.

Opengl es 2.0 vs 3.0