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shapes.go
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shapes.go
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package glutils
import (
"github.com/pzsz/gl"
v "github.com/pzsz/lin3dmath"
)
func BuildCubeBuffer(halfSize v.Vector3f) *MeshBuffer {
buffer := NewMeshBuffer(8, 6*6, RENDER_POLYGONS, 0)
build := ReuseMeshBuilder(buffer)
// 7----6
// /| /|
// 4----5 |
// | | | |
// | 3--|-2
// |/ |/
// 0----1
i0 := build.StartVertex()
build.AddPosition(-halfSize.X, -halfSize.Y, -halfSize.Z)
i1 := build.StartVertex()
build.AddPosition(halfSize.X, -halfSize.Y, -halfSize.Z)
i2 := build.StartVertex()
build.AddPosition(halfSize.X, halfSize.Y, -halfSize.Z)
i3 := build.StartVertex()
build.AddPosition(-halfSize.X, halfSize.Y, -halfSize.Z)
i4 := build.StartVertex()
build.AddPosition(-halfSize.X, -halfSize.Y, halfSize.Z)
i5 := build.StartVertex()
build.AddPosition(halfSize.X, -halfSize.Y, halfSize.Z)
i6 := build.StartVertex()
build.AddPosition(halfSize.X, halfSize.Y, halfSize.Z)
i7 := build.StartVertex()
build.AddPosition(-halfSize.X, halfSize.Y, halfSize.Z)
build.AddIndice3(i0, i1, i5)
build.AddIndice3(i5, i4, i0)
build.AddIndice3(i1, i2, i6)
build.AddIndice3(i6, i5, i1)
build.AddIndice3(i6, i2, i3)
build.AddIndice3(i3, i7, i6)
build.AddIndice3(i3, i0, i4)
build.AddIndice3(i4, i7, i3)
build.AddIndice3(i4, i5, i6)
build.AddIndice3(i6, i7, i4)
build.AddIndice3(i0, i3, i2)
build.AddIndice3(i2, i1, i0)
build.Finalize(true, buffer)
return buffer
}
func RenderLine(camera *Camera, m *v.Matrix4, from, to v.Vector3f, colour Colour) {
camera.LoadProjection()
camera.LoadModelview(m)
gl.Color4ub(colour.R, colour.G, colour.B, colour.A)
gl.Begin(gl.LINES)
gl.Vertex3f(from.X, from.Y, from.Z)
gl.Vertex3f(to.X, to.Y, to.Z)
gl.End()
}
func RenderWireQuad(camera *Camera, m *v.Matrix4, size float32, colour Colour) {
camera.LoadProjection()
camera.LoadModelview(m)
gl.Color4ub(colour.R, colour.G, colour.B, colour.A)
gl.Begin(gl.LINES)
gl.Vertex3f(-size, -size, 0)
gl.Vertex3f(-size, size, 0)
gl.Vertex3f(-size, size, 0)
gl.Vertex3f(size, size, 0)
gl.Vertex3f(size, size, 0)
gl.Vertex3f(size, -size, 0)
gl.Vertex3f(size, -size, 0)
gl.Vertex3f(-size, -size, 0)
gl.End()
}
func RenderUIStart() {
gl.Disable(gl.DEPTH_TEST)
gl.DepthMask(false)
}
func RenderUIEnd() {
gl.Enable(gl.DEPTH_TEST)
gl.DepthMask(true)
}
func RenderWireRect(cam *Camera, m *v.Matrix4, size_x, size_y float32, colour Colour) {
cam.LoadProjection()
cam.LoadModelview(m)
gl.Color4ub(colour.R, colour.G, colour.B, colour.A)
gl.Begin(gl.LINES)
gl.Vertex3f(-size_x, -size_y, 0)
gl.Vertex3f(-size_x, size_y, 0)
gl.Vertex3f(-size_x, size_y, 0)
gl.Vertex3f(size_x, size_y, 0)
gl.Vertex3f(size_x, size_y, 0)
gl.Vertex3f(size_x, -size_y, 0)
gl.Vertex3f(size_x, -size_y, 0)
gl.Vertex3f(-size_x, -size_y, 0)
gl.End()
gl.Color4ub(255, 255, 255, 255)
}
func RenderSprite(cam *Camera, m *v.Matrix4, sizeX, sizeY float32, t *Texture) {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.DepthMask(false)
//gl.Disable(gl.DEPTH_TEST)
RenderTexturedRect(cam, m, sizeX, sizeY, t)
gl.Disable(gl.BLEND)
gl.DepthMask(true)
//gl.Enable(gl.DEPTH_TEST)
}
func RenderTexturedRect(cam *Camera, m *v.Matrix4, sizeX, sizeY float32, t *Texture) {
cam.LoadProjection()
cam.LoadModelview(m)
gl.Enable(gl.TEXTURE_2D)
t.tex.Bind(gl.TEXTURE_2D)
gl.Color4ub(255, 255, 255, 255)
gl.Begin(gl.QUADS)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-sizeX, -sizeY, 0)
gl.TexCoord2f(1, 1)
gl.Vertex3f(sizeX, -sizeY, 0)
gl.TexCoord2f(1, 0)
gl.Vertex3f(sizeX, sizeY, 0)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-sizeX, sizeY, 0)
gl.End()
gl.Disable(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, 0)
}
func RenderRect(cam *Camera, m *v.Matrix4, sizeX, sizeY float32, c Colour) {
cam.LoadProjection()
cam.LoadModelview(m)
gl.Color4ub(c.R, c.G, c.B, c.A)
gl.Begin(gl.QUADS)
gl.Vertex3f(-sizeX, -sizeY, 0)
gl.Vertex3f(sizeX, -sizeY, 0)
gl.Vertex3f(sizeX, sizeY, 0)
gl.Vertex3f(-sizeX, sizeY, 0)
gl.End()
}