func BoxFlipbook(geometry *renderer.Geometry, frame, framesX, framesY int) {
frameSizeX := 1.0 / float32(framesX)
frameSizeY := 1.0 / float32(framesY)
indexX := float32(frame % framesX)
indexY := float32(framesY - (frame / framesY) - 1)
u1, u2 := frameSizeX*indexX, frameSizeX*(indexX+1.0)
v1, v2 := frameSizeY*indexY, frameSizeY*(indexY+1.0)
geometry.SetUVs(u1, v1, u2, v1, u2, v2, u1, v2)
}
// CreateGeometry - add geometry to the renderer
func (glRenderer *OpenglRenderer) CreateGeometry(geometry *renderer.Geometry) {
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(geometry.Verticies)*4, gl.Ptr(geometry.Verticies), gl.DYNAMIC_DRAW)
geometry.VboId = vbo
var ibo uint32
gl.GenBuffers(1, &ibo)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, ibo)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(geometry.Indicies)*4, gl.Ptr(geometry.Indicies), gl.DYNAMIC_DRAW)
geometry.IboId = ibo
}
func (glRenderer *OpenglRenderer) DrawGeometry(geometry *renderer.Geometry, transform mgl32.Mat4) {
glRenderer.enableShader()
glRenderer.enableMaterial()
glRenderer.enableCubeMap()
if glRenderer.activeShader == nil {
panic("ERROR: No shader is configured.")
}
shader := glRenderer.activeShader
program := shader.Program
params := glRenderer.rendererParams
glRenderer.enableDepthTest(params.DepthTest)
glRenderer.enableDepthMask(params.DepthMask)
glRenderer.enableCullFace(params.CullBackface)
glRenderer.enableUnlit(params.Unlit)
glRenderer.setTransparency(params.Transparency)
// set buffers
gl.BindBuffer(gl.ARRAY_BUFFER, geometry.VboId)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, geometry.IboId)
// update buffers
if geometry.VboDirty && len(geometry.Verticies) > 0 && len(geometry.Indicies) > 0 {
gl.BufferData(gl.ARRAY_BUFFER, len(geometry.Verticies)*4, gl.Ptr(geometry.Verticies), gl.DYNAMIC_DRAW)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(geometry.Indicies)*4, gl.Ptr(geometry.Indicies), gl.DYNAMIC_DRAW)
geometry.VboDirty = false
}
// set uniforms
modelNormal := transform.Inv().Transpose()
shader.Uniforms["model"] = transform
shader.Uniforms["modelNormal"] = modelNormal
// set camera uniforms
cam := glRenderer.camera
win := glRenderer.WindowDimensions()
shader.Uniforms["cameraTranslation"] = cam.Translation
if cam.Ortho {
shader.Uniforms["projection"] = mgl32.Ortho2D(0, win.X(), win.Y(), 0)
shader.Uniforms["camera"] = mgl32.Ident4()
} else {
shader.Uniforms["projection"] = mgl32.Perspective(mgl32.DegToRad(cam.Angle), win.X()/win.Y(), cam.Near, cam.Far)
shader.Uniforms["camera"] = mgl32.LookAtV(cam.Translation, cam.Lookat, cam.Up)
}
shader.Uniforms["unlit"] = glRenderer.unlit
shader.Uniforms["useTextures"] = glRenderer.useTextures
shader.Uniforms["ambientLightValue"] = glRenderer.ambientLightValue
shader.Uniforms["nbPointLights"] = glRenderer.nbPointLights
shader.Uniforms["pointLightValues"] = glRenderer.pointLightValues
shader.Uniforms["pointLightPositions"] = glRenderer.pointLightPositions
shader.Uniforms["nbDirectionalLights"] = glRenderer.nbDirectionalLights
shader.Uniforms["directionalLightValues"] = glRenderer.directionalLightValues
shader.Uniforms["directionalLightVectors"] = glRenderer.directionalLightVectors
// set custom uniforms
setupUniforms(shader)
// set verticies attribute
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, renderer.VertexStride*4, gl.PtrOffset(0))
// set normals attribute
normAttrib := uint32(gl.GetAttribLocation(program, gl.Str("normal\x00")))
gl.EnableVertexAttribArray(normAttrib)
gl.VertexAttribPointer(normAttrib, 3, gl.FLOAT, false, renderer.VertexStride*4, gl.PtrOffset(3*4))
// set texture coord attribute
texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("texCoord\x00")))
gl.EnableVertexAttribArray(texCoordAttrib)
gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, renderer.VertexStride*4, gl.PtrOffset(6*4))
// vertex color attribute
colorAttrib := uint32(gl.GetAttribLocation(program, gl.Str("color\x00")))
gl.EnableVertexAttribArray(colorAttrib)
gl.VertexAttribPointer(colorAttrib, 4, gl.FLOAT, false, renderer.VertexStride*4, gl.PtrOffset(8*4))
gl.DrawElements(gl.TRIANGLES, (int32)(len(geometry.Indicies)), gl.UNSIGNED_INT, gl.PtrOffset(0))
}