// Render renders the model
func (m *Model) Render() {
gl.UseProgram(m.currentProgram)
gl.UniformMatrix4fv(m.modelUniform, 1, false, &m.model[0])
gl.BindVertexArray(m.vao)
gl.ActiveTexture(gl.TEXTURE0)
texture, isLoaded := m.textures.GetTexture(m.data.TextureFile)
if isLoaded {
gl.BindTexture(gl.TEXTURE_2D, texture)
} else {
if m.data.TextureFile != "" {
go fmt.Printf("Unable to load texture %s", m.data.TextureFile)
}
}
if m.data.Indexed {
gl.DrawElements(gl.TRIANGLE_FAN, int32(len(m.data.Indices)), gl.UNSIGNED_INT, gl.PtrOffset(0))
} else {
gl.DrawArrays(gl.TRIANGLES, 0, int32(len(m.data.Verts))/m.data.VertSize)
}
gl.BindVertexArray(0)
}
func (v *VBO) DrawQuads(nquads int) {
gl.DrawElements(gl.TRIANGLES, int32(nquads*6), gl.UNSIGNED_INT, nil)
//gl.DrawElements(gl.LINE_STRIP, 6, gl.UNSIGNED_INT, nil)
}
func (v *VBO) Draw() {
gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, nil)
//gl.DrawElements(gl.LINE_STRIP, 6, gl.UNSIGNED_INT, nil)
}
func programLoop(window *glfw.Window) {
// the linked shader program determines how the data will be rendered
vertexShader := compileShader(vertexShaderSource, gl.VERTEX_SHADER)
fragmentShaderBlue := compileShader(fragmentShaderBlueSource, gl.FRAGMENT_SHADER)
shaderProgramBlue := linkShaders([]uint32{vertexShader, fragmentShaderBlue})
fragmentShaderRed := compileShader(fragmentShaderRedSource, gl.FRAGMENT_SHADER)
shaderProgramRed := linkShaders([]uint32{vertexShader, fragmentShaderRed})
// shader objects are not needed after they are linked into a program object
gl.DeleteShader(vertexShader)
gl.DeleteShader(fragmentShaderBlue)
gl.DeleteShader(fragmentShaderRed)
vertices1 := []float32{
0.2, 0.2, 0.0, // top right
0.2, -0.8, 0.0, // bottom right
-0.8, -0.8, 0.0, // bottom left
-0.8, 0.2, 0.0, // top left
}
indices1 := []uint32{
0, 1, 3, // first triangle
1, 2, 3, // second triangle
}
VAO1 := createTriangleVAO(vertices1, indices1)
vertices2 := []float32{
0.2, 0.6, 0.0, // top
0.6, -0.2, 0.0, // bottom right
-0.2, -0.2, 0.0, // bottom left
}
indices2 := []uint32{
0, 1, 2, // only triangle
}
VAO2 := createTriangleVAO(vertices2, indices2)
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// perform rendering
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// draw loop
// draw rectangle
gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)
gl.UseProgram(shaderProgramRed)
gl.BindVertexArray(VAO1)
gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
// draw triangle
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
gl.UseProgram(shaderProgramBlue)
gl.BindVertexArray(VAO2)
gl.DrawElements(gl.TRIANGLES, 3, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
// end of draw loop
// swap in the rendered buffer
window.SwapBuffers()
}
}
func programLoop(window *glfw.Window) error {
// the linked shader program determines how the data will be rendered
vertShader, err := gfx.NewShaderFromFile("shaders/basic.vert", gl.VERTEX_SHADER)
if err != nil {
return err
}
fragShader, err := gfx.NewShaderFromFile("shaders/basic.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
shaderProgram, err := gfx.NewProgram(vertShader, fragShader)
if err != nil {
return err
}
defer shaderProgram.Delete()
vertices := []float32{
// top
0.0, 0.5, 0.0, // position
1.0, 0.0, 0.0, // Color
// bottom right
0.5, -0.5, 0.0,
0.0, 1.0, 0.0,
// bottom left
-0.5, -0.5, 0.0,
0.0, 0.0, 1.0,
}
indices := []uint32{
0, 1, 2, // only triangle
}
VAO := createTriangleVAO(vertices, indices)
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// perform rendering
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// draw loop
// draw triangle
shaderProgram.Use()
gl.BindVertexArray(VAO)
gl.DrawElements(gl.TRIANGLES, 3, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
// end of draw loop
// swap in the rendered buffer
window.SwapBuffers()
}
return nil
}
func programLoop(window *glfw.Window) error {
// the linked shader program determines how the data will be rendered
vertShader, err := gfx.NewShaderFromFile("shaders/basic.vert", gl.VERTEX_SHADER)
if err != nil {
return err
}
fragShader, err := gfx.NewShaderFromFile("shaders/basic.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
shaderProgram, err := gfx.NewProgram(vertShader, fragShader)
if err != nil {
return err
}
defer shaderProgram.Delete()
vertices := []float32{
// top left
-0.75, 0.75, 0.0, // position
1.0, 0.0, 0.0, // Color
1.0, 0.0, // texture coordinates
// top right
0.75, 0.75, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0,
// bottom right
0.75, -0.75, 0.0,
0.0, 0.0, 1.0,
0.0, 1.0,
// bottom left
-0.75, -0.75, 0.0,
1.0, 1.0, 1.0,
1.0, 1.0,
}
indices := []uint32{
// rectangle
0, 1, 2, // top triangle
0, 2, 3, // bottom triangle
}
VAO := createVAO(vertices, indices)
texture0, err := gfx.NewTextureFromFile("../images/RTS_Crate.png",
gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
if err != nil {
panic(err.Error())
}
texture1, err := gfx.NewTextureFromFile("../images/trollface.png",
gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
if err != nil {
panic(err.Error())
}
for !window.ShouldClose() {
// poll events and call their registered callbacks
glfw.PollEvents()
// background color
gl.ClearColor(0.2, 0.5, 0.5, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// draw vertices
shaderProgram.Use()
// set texture0 to uniform0 in the fragment shader
texture0.Bind(gl.TEXTURE0)
texture0.SetUniform(shaderProgram.GetUniformLocation("ourTexture0"))
// set texture1 to uniform1 in the fragment shader
texture1.Bind(gl.TEXTURE1)
texture1.SetUniform(shaderProgram.GetUniformLocation("ourTexture1"))
gl.BindVertexArray(VAO)
gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, unsafe.Pointer(nil))
gl.BindVertexArray(0)
texture0.UnBind()
texture1.UnBind()
// end of draw loop
// swap in the rendered buffer
window.SwapBuffers()
}
return nil
}
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))
}