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MapIcons.go
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MapIcons.go
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package levels
import (
"fmt"
mgl "github.com/go-gl/mathgl/mgl32"
"github.com/inkyblackness/hacked/editor/graphics"
"github.com/inkyblackness/hacked/editor/render"
"github.com/inkyblackness/hacked/ui/opengl"
)
var mapIconsVertexShaderSource = `
#version 150
precision mediump float;
in vec3 vertexPosition;
in vec3 uvPosition;
uniform mat4 modelMatrix;
uniform mat4 viewMatrix;
uniform mat4 projectionMatrix;
out vec2 uv;
void main(void) {
gl_Position = projectionMatrix * viewMatrix * modelMatrix * vec4(vertexPosition, 1.0);
uv = uvPosition.xy;
}
`
var mapIconsFragmentShaderSource = `
#version 150
precision mediump float;
uniform sampler2D palette;
uniform sampler2D bitmap;
in vec2 uv;
out vec4 fragColor;
void main(void) {
vec4 pixel = texture(bitmap, uv);
if (pixel.r > 0.0) {
fragColor = texture(palette, vec2(pixel.r, 0.5));
} else {
discard;
}
}
`
// MapIcons is a renderable for simple bitmaps.
type MapIcons struct {
context *render.Context
program uint32
vao *opengl.VertexArrayObject
vertexPositionBuffer uint32
vertexPositionAttrib int32
uvPositionBuffer uint32
uvPositionAttrib int32
modelMatrixUniform opengl.Matrix4Uniform
viewMatrixUniform opengl.Matrix4Uniform
projectionMatrixUniform opengl.Matrix4Uniform
paletteUniform int32
bitmapUniform int32
}
type iconData struct {
pos MapPosition
texture *graphics.BitmapTexture
}
// NewMapIcons returns a new instance.
func NewMapIcons(context *render.Context) *MapIcons {
gl := context.OpenGL
program, programErr := opengl.LinkNewStandardProgram(gl, mapIconsVertexShaderSource, mapIconsFragmentShaderSource)
if programErr != nil {
panic(fmt.Errorf("MapIcons shader failed: %v", programErr))
}
renderable := &MapIcons{
context: context,
program: program,
vao: opengl.NewVertexArrayObject(gl, program),
vertexPositionBuffer: gl.GenBuffers(1)[0],
vertexPositionAttrib: gl.GetAttribLocation(program, "vertexPosition"),
uvPositionBuffer: gl.GenBuffers(1)[0],
uvPositionAttrib: gl.GetAttribLocation(program, "uvPosition"),
modelMatrixUniform: opengl.Matrix4Uniform(gl.GetUniformLocation(program, "modelMatrix")),
viewMatrixUniform: opengl.Matrix4Uniform(gl.GetUniformLocation(program, "viewMatrix")),
projectionMatrixUniform: opengl.Matrix4Uniform(gl.GetUniformLocation(program, "projectionMatrix")),
paletteUniform: gl.GetUniformLocation(program, "palette"),
bitmapUniform: gl.GetUniformLocation(program, "bitmap")}
{
half := float32(0.5)
var vertices = []float32{
-half, half, 0.0,
half, half, 0.0,
half, -half, 0.0,
half, -half, 0.0,
-half, -half, 0.0,
-half, half, 0.0}
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.vertexPositionBuffer)
gl.BufferData(opengl.ARRAY_BUFFER, len(vertices)*4, vertices, opengl.STATIC_DRAW)
gl.BindBuffer(opengl.ARRAY_BUFFER, 0)
}
renderable.vao.WithSetter(func(gl opengl.OpenGL) {
gl.EnableVertexAttribArray(uint32(renderable.vertexPositionAttrib))
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.vertexPositionBuffer)
gl.VertexAttribOffset(uint32(renderable.vertexPositionAttrib), 3, opengl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(uint32(renderable.uvPositionAttrib))
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.uvPositionBuffer)
gl.VertexAttribOffset(uint32(renderable.uvPositionAttrib), 3, opengl.FLOAT, false, 0, 0)
gl.BindBuffer(opengl.ARRAY_BUFFER, 0)
})
return renderable
}
// Render renders the icons with their center at given position
func (renderable *MapIcons) Render(paletteTexture *graphics.PaletteTexture, iconSize float32, icons []iconData) {
gl := renderable.context.OpenGL
renderable.vao.OnShader(func() {
renderable.viewMatrixUniform.Set(gl, renderable.context.ViewMatrix)
renderable.projectionMatrixUniform.Set(gl, &renderable.context.ProjectionMatrix)
textureUnit := int32(0)
gl.ActiveTexture(opengl.TEXTURE0 + uint32(textureUnit))
gl.BindTexture(opengl.TEXTURE_2D, paletteTexture.Handle())
gl.Uniform1i(renderable.paletteUniform, textureUnit)
textureUnit = 1
gl.ActiveTexture(opengl.TEXTURE0 + uint32(textureUnit))
gl.Uniform1i(renderable.bitmapUniform, textureUnit)
for _, icon := range icons {
x, y := float32(icon.pos.X), float32(icon.pos.Y)
u, v := icon.texture.UV()
width, height := renderable.limitedSize(iconSize, icon.texture)
modelMatrix := mgl.Ident4().
Mul4(mgl.Translate3D(x, y, 0.0)).
Mul4(mgl.Scale3D(width, height, 1.0))
renderable.modelMatrixUniform.Set(gl, &modelMatrix)
var uv = []float32{
0.0, 0.0, 0.0,
u, 0.0, 0.0,
u, v, 0.0,
u, v, 0.0,
0.0, v, 0.0,
0.0, 0.0, 0.0}
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.uvPositionBuffer)
gl.BufferData(opengl.ARRAY_BUFFER, len(uv)*4, uv, opengl.STATIC_DRAW)
gl.BindBuffer(opengl.ARRAY_BUFFER, 0)
gl.BindTexture(opengl.TEXTURE_2D, icon.texture.Handle())
gl.DrawArrays(opengl.TRIANGLES, 0, 6)
}
gl.BindTexture(opengl.TEXTURE_2D, 0)
})
}
func (renderable *MapIcons) limitedSize(iconSize float32, texture *graphics.BitmapTexture) (width, height float32) {
width, height = texture.Size()
referenceSize := float32(16.0)
larger := width
if larger < height {
larger = height
}
if larger > referenceSize {
ratio := referenceSize / larger
width *= ratio
height *= ratio
}
factor := iconSize / referenceSize
width *= factor
height *= factor
return
}