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January 12, 2015 13:10
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Go SDL2 OpenGL minimal example
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package main | |
import ( | |
"runtime" | |
"github.com/go-gl/gl" | |
"github.com/veandco/go-sdl2/sdl" | |
) | |
func main() { | |
winTitle := "OpenGL Demo" | |
winX, winY := sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED | |
winWidth, winHeight := 800, 600 | |
runtime.LockOSThread() | |
sdl.Init(sdl.INIT_VIDEO) | |
defer sdl.Quit() | |
sdl.GL_SetAttribute(sdl.GL_CONTEXT_PROFILE_MASK, sdl.GL_CONTEXT_PROFILE_CORE) | |
sdl.GL_SetAttribute(sdl.GL_CONTEXT_MAJOR_VERSION, 3) | |
sdl.GL_SetAttribute(sdl.GL_CONTEXT_MINOR_VERSION, 2) | |
window, _ := sdl.CreateWindow(winTitle, winX, winY, winWidth, winHeight, sdl.WINDOW_OPENGL) | |
defer window.Destroy() | |
context := sdl.GL_CreateContext(window) | |
defer sdl.GL_DeleteContext(context) | |
gl.Init() | |
vertSource := ` | |
#version 150 core | |
in vec2 position; | |
void main() { | |
gl_Position = vec4(position, 0.0, 1.0); | |
}` | |
fragSource := ` | |
#version 150 core | |
out vec4 outColor; | |
void main() { | |
outColor = vec4(1.0, 1.0, 1.0, 1.0); | |
}` | |
vao := gl.GenVertexArray() | |
vao.Bind() | |
defer vao.Delete() | |
vbo := gl.GenBuffer() | |
vbo.Bind(gl.ARRAY_BUFFER) | |
defer vbo.Delete() | |
verts := []float32{ | |
0.0, 0.5, | |
0.5, -0.5, | |
-0.5, -0.5, | |
} | |
gl.BufferData(gl.ARRAY_BUFFER, len(verts)*4, verts, gl.STATIC_DRAW) | |
vertShader := gl.CreateShader(gl.VERTEX_SHADER) | |
vertShader.Source(vertSource) | |
vertShader.Compile() | |
defer vertShader.Delete() | |
fragShader := gl.CreateShader(gl.FRAGMENT_SHADER) | |
fragShader.Source(fragSource) | |
fragShader.Compile() | |
defer fragShader.Delete() | |
shaderProgram := gl.CreateProgram() | |
shaderProgram.AttachShader(vertShader) | |
shaderProgram.AttachShader(fragShader) | |
shaderProgram.BindFragDataLocation(0, "outColor") | |
shaderProgram.Link() | |
shaderProgram.Use() | |
defer shaderProgram.Delete() | |
posAttrib := shaderProgram.GetAttribLocation("position") | |
posAttrib.EnableArray() | |
posAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil) | |
for running := true; running; { | |
for e := sdl.PollEvent(); e != nil; e = sdl.PollEvent() { | |
switch e.(type) { | |
case *sdl.QuitEvent: | |
running = false | |
} | |
} | |
gl.ClearColor(0, 0, 0, 1) | |
gl.Clear(gl.COLOR_BUFFER_BIT) | |
gl.DrawArrays(gl.TRIANGLES, 0, 3) | |
sdl.GL_SwapWindow(window) | |
} | |
} |
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