https://github.com/vbsw/shaders

simple vertex and fragement shader, version 1.30 (OpenGL 3.0)
https://github.com/vbsw/shaders

example glsl go golang shader simple

Last synced: 11 days ago
JSON representation

simple vertex and fragement shader, version 1.30 (OpenGL 3.0)

• Host: GitHub
• URL: https://github.com/vbsw/shaders
• Owner: vbsw
• License: bsl-1.0
• Created: 2020-05-18T09:17:44.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2021-08-05T17:24:58.000Z (over 4 years ago)
• Last Synced: 2023-07-27T22:45:08.017Z (over 2 years ago)
• Topics: example, glsl, go, golang, shader, simple
• Language: Go
• Homepage:
• Size: 7.81 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

          
# Shaders

[![GoDoc](https://godoc.org/github.com/vbsw/shaders?status.svg)](https://godoc.org/github.com/vbsw/shaders) [![Go Report Card](https://goreportcard.com/badge/github.com/vbsw/shaders)](https://goreportcard.com/report/github.com/vbsw/shaders) [![Stability: Experimental](https://masterminds.github.io/stability/experimental.svg)](https://masterminds.github.io/stability/experimental.html)

## About

This package contains plain vertex and fragment shaders, version 1.30 (OpenGL 3.0), for Go. It is published on  and .

## Copyright

Copyright 2020, Vitali Baumtrok (vbsw@mailbox.org).

Shaders is distributed under the Boost Software License, version 1.0. (See accompanying file LICENSE or copy at http://www.boost.org/LICENSE_1_0.txt)

Shaders is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the Boost Software License for more details.

## Examples

With this package:

	import (

		"github.com/go-gl/gl/v3.3-core/gl"

		"github.com/vbsw/shaders"

	)

	func main() {

		....

		shader := shaders.NewPrimitiveShader()

		shader.VertexShaderID = gl.CreateShader(gl.VERTEX_SHADER)

		gl.ShaderSource(shader.VertexShaderID, 1, shader.VertexShader, nil)

		....

	}

Standard way:

	import (

		"github.com/go-gl/gl/v3.3-core/gl"

	)

	func main() {

		....

		vertexShaderStr := "#version 130\nin vec3 vp;\nvoid main () {\n\tgl_Position = vec4(vp, 1.0);\n}"

		shaderID := gl.CreateShader(gl.VERTEX_SHADER)

		vertexShaderC, free := gl.Strs(vertexShaderStr + "\x00")

		gl.ShaderSource(shaderID, 1, vertexShaderC, nil)

		free()

		....

	}

Initialize the projection matrix:

	import (

		"github.com/go-gl/gl/v3.3-core/gl"

		"github.com/vbsw/shaders"

	)

	func main() {

		....

		shader.ProjectionLocation = gl.GetUniformLocation(shader.ProgramID, shader.ProjectionUniform)

		gl.UseProgram(shader.ProgramID)

		setProjection(shader.ProjectionLocation, 400, 400)

		....

	}

	func setProjection(projectionLocation int32, width, height int) {

		projectionMatrix := make([]float32, 4*4)

		projectionMatrix[0] = 2.0 / float32(width)

		projectionMatrix[5] = 2.0 / float32(height)

		projectionMatrix[12] = -1.0

		projectionMatrix[13] = -1.0

		projectionMatrix[15] = 1.0

		gl.UniformMatrix4fv(projectionLocation, 1, false, &projectionMatrix[0]);

	}

## References

- https://golang.org/doc/install

- https://git-scm.com/book/en/v2/Getting-Started-Installing-Git

- https://www.khronos.org/registry/OpenGL/specs/gl/GLSLangSpec.1.30.pdf

- https://github.com/go-gl/gl/blob/master/v3.3-core/gl/conversions.go

- https://git.sr.ht/~eliasnaur/gio/tree/master/example/glfw/main.go