The Graphics Pipeline

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1 The Graphics Pipeline Lecture 2 Robb T. Koether Hampden-Sydney College Fri, Aug 28, 2015 Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

2 Outline 1 Vertices 2 The Graphics Pipeline 3 The Vertex Shader 4 The Fragment Shader 5 Assignment Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

3 Outline 1 Vertices 2 The Graphics Pipeline 3 The Vertex Shader 4 The Fragment Shader 5 Assignment Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

4 Vertices Objects consist basically of a set of vertices that define points in the plane (2D) or in space (3D). The vertices are grouped to create triangles, rectangles, and more complex surfaces. For example, a box might consist of 6 rectangles, each having 4 vertices. Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

5 Vertices Vertices are described by specifying their attributes. Position Color Normal vector (orientation) Texture coordinates These attributes are fed into the graphics pipeline. Each stage of the pipeline performs an operation on the object. Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

6 Outline 1 Vertices 2 The Graphics Pipeline 3 The Vertex Shader 4 The Fragment Shader 5 Assignment Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

7 Stages of the Pipeline The stages of the pipeline: Vertex shader Tessellation shader Geometry shader Primitive assembly Clipping Rasterization Fragment shader Per-fragment processing Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

8 Shaders The programmer is responsible for the shaders Vertex shader Tessellation shader Geometry shader Fragment shader The vertex shader and the fragment shader are mandatory. The tessellation shader and the geometry shader are optional. Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

9 The Graphics Pipeline Vertex Data Vertex Shader Tessellation Shader Geometry Shader Fragment Shader Rasterization Clipping Primitive Assembly Depth Testing Display Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

10 Outline 1 Vertices 2 The Graphics Pipeline 3 The Vertex Shader 4 The Fragment Shader 5 Assignment Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

11 The Vertex Shader At a minimum, the vertex shader assigns a value to the built-in shader variable gl_position. If that is all that the shader does, then it is called a pass-through shader. Vertex shaders typically do much more than that. Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

12 A Pass-Through Vertex Shader A Pass-Through Vertex Shader #version 330 core layout (location = 0) in vec3 vposition; void main() { gl_position = vec4(vposition, 1.0f); } Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

13 A Pass-Through Vertex Shader A Pass-Through Vertex Shader (with Color) #version 330 core layout (location = 0) in vec3 vposition; layout (location = 1) in vec3 vcolor; out vec4 color; void main() { gl_position = vposition; color = vec4(vcolor, 1.0f); } Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

14 Outline 1 Vertices 2 The Graphics Pipeline 3 The Vertex Shader 4 The Fragment Shader 5 Assignment Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

15 The Fragment Shader A fragment is typically a pixel, although it may be a part of a pixel. At a minimum, the fragment shader outputs the color of the pixel. The name of the output variable does not matter because all fragment shaders output only the color. If that is all that the shader does, then it is called a pass-through shader. Fragment shaders typically do much more than that. Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

16 A Pass-Through Fragment Shader A Pass-Through Fragment Shader (without Color Input) #version 330 core out vec4 fragcolor; void main() { fragcolor = vec4(1.0f, 0.0f, 0.0f, 1.0f); } Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

17 A Pass-Through Fragment Shader A Pass-Through Fragment Shader (with Color Input) #version 330 core in vec4 color; out vec4 fragcolor; void main() { fragcolor = color; } Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

18 Outline 1 Vertices 2 The Graphics Pipeline 3 The Vertex Shader 4 The Fragment Shader 5 Assignment Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

19 Assignment Assignment Read pp in The Red Book. Robb T. Koether (Hampden-Sydney College) The Graphics Pipeline Fri, Aug 28, / 19

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