247 lines
8.7 KiB
Odin
247 lines
8.7 KiB
Odin
package renderer
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import "core:math"
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import "core:log"
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Mesh :: struct {
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amount_of_indices: u32,
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backend: Mesh_Backend,
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}
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Mesh_Handle :: distinct u32
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Buffer_Handle :: distinct u32
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Mesh_Layout :: struct {
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name: string,
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amount: u8,
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type_size: u32,
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}
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create_mesh :: proc {
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create_mesh_layout_vertices_indices,
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create_mesh_from_primitive,
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}
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create_mesh_layout_vertices_indices :: proc(renderer: ^Renderer, layout: []Mesh_Layout, vertices: []f32, indices: []u32) -> (Mesh, bool) { // TODO: SS - Should probably return a Mesh_Handle.
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mesh: Mesh
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if len(vertices) == 0 {
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return {}, false
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}
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if len(indices) == 0 {
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return {}, false
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}
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m: Mesh
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m.amount_of_indices = u32(len(indices))
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when RENDER_BACKEND_OPENGL {
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opengl_mesh, ok := opengl_create_mesh(renderer, layout, vertices, indices)
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if !ok {
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return {}, false
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}
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m.backend = opengl_mesh
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}
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else {
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#assert(false)
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}
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return m, true
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}
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Primitive_Mesh_Type :: enum {
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Cube,
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Quad,
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Sphere,
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}
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create_mesh_from_primitive :: proc(renderer: ^Renderer, primitive_mesh_type: Primitive_Mesh_Type) -> (Mesh, bool) {
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switch primitive_mesh_type {
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case .Cube: {
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m, ok := create_mesh(
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renderer = renderer,
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layout = {
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{ "position", 3, size_of(f32), },
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{ "normal", 3, size_of(f32), },
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{ "texture_coords", 2, size_of(f32), },
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{ "tangent", 3, size_of(f32), },
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},
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vertices = []f32{
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// Positions // Normals // UV // Tangent
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// Back face
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-0.5, -0.5, -0.5, 0.0, 0.0, -1.0, 0.0, 0.0, 1.0, 0.0, 0.0,
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0.5, -0.5, -0.5, 0.0, 0.0, -1.0, 1.0, 0.0, 1.0, 0.0, 0.0,
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0.5, 0.5, -0.5, 0.0, 0.0, -1.0, 1.0, 1.0, 1.0, 0.0, 0.0,
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-0.5, 0.5, -0.5, 0.0, 0.0, -1.0, 0.0, 1.0, 1.0, 0.0, 0.0,
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// Front face
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-0.5, -0.5, 0.5, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0,
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0.5, -0.5, 0.5, 0.0, 0.0, 1.0, 1.0, 0.0, 1.0, 0.0, 0.0,
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0.5, 0.5, 0.5, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, 0.0,
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-0.5, 0.5, 0.5, 0.0, 0.0, 1.0, 0.0, 1.0, 1.0, 0.0, 0.0,
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// Left face
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-0.5, 0.5, 0.5, -1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0,
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-0.5, 0.5, -0.5, -1.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 1.0,
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-0.5, -0.5, -0.5, -1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 1.0,
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-0.5, -0.5, 0.5, -1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0,
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// Right face
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0.5, 0.5, 0.5, 1.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, -1.0,
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0.5, -0.5, 0.5, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -1.0,
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0.5, -0.5, -0.5, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, -1.0,
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0.5, 0.5, -0.5, 1.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, -1.0,
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// Bottom face
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-0.5, -0.5, -0.5, 0.0,-1.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0,
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0.5, -0.5, -0.5, 0.0,-1.0, 0.0, 1.0, 1.0, 1.0, 0.0, 0.0,
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0.5, -0.5, 0.5, 0.0,-1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0,
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-0.5, -0.5, 0.5, 0.0,-1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0,
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// Top face
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-0.5, 0.5, -0.5, 0.0, 1.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0,
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0.5, 0.5, -0.5, 0.0, 1.0, 0.0, 1.0, 1.0, 1.0, 0.0, 0.0,
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0.5, 0.5, 0.5, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 0.0, 0.0,
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-0.5, 0.5, 0.5, 0.0, 1.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0,
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},
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indices = []u32 {
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// Back face
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0, 3, 1,
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1, 3, 2,
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// Front face
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4, 5, 7,
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5, 6, 7,
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// Left face
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8, 9, 11,
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9, 10, 11,
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// Right face
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12, 13, 15,
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13, 14, 15,
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// Bottom face
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16, 17, 18,
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16, 18, 19,
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// Top face
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20, 22, 21,
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20, 23, 22
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}
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)
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return m, ok
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}
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case .Quad: {
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m, ok := create_mesh(
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renderer = renderer,
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layout = {
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{ "position", 3, size_of(f32), },
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{ "normal", 3, size_of(f32), },
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{ "texture_coords", 2, size_of(f32), },
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{ "tangent", 3, size_of(f32), },
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},
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vertices = []f32 {
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// Positions. // Normals // Texture Coordinates. // Tangent.
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0.5, 0.5, 0.0, 0, 0, 0, 1.0, 1.0, 1, 0, 0, // Top right.
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0.5, -0.5, 0.0, 0, 0, 0, 1.0, 0.0, 1, 0, 0, // Bottom right.
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-0.5, -0.5, 0.0, 0, 0, 0, 0.0, 0.0, 1, 0, 0, // Bottom left.
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-0.5, 0.5, 0.0, 0, 0, 0, 0.0, 1.0, 1, 0, 0, // Top left.
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},
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indices = []u32 {
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0, 1, 3,
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1, 2, 3,
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}
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)
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return m, ok
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}
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case .Sphere: {
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X_SEGMENTS :: 64
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Y_SEGMENTS :: 32
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vertices := make([dynamic]f32, 0)
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indices := make([dynamic]u32, 0)
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defer delete(vertices)
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defer delete(indices)
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for y in 0..=Y_SEGMENTS {
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y_segment := f32(y) / f32(Y_SEGMENTS)
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phi := y_segment * math.PI
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for x in 0..=X_SEGMENTS {
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x_segment := f32(x) / f32(X_SEGMENTS)
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theta := x_segment * math.TAU
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px := math.cos(theta) * math.sin(phi)
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py := math.cos(phi)
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pz := math.sin(theta) * math.sin(phi)
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// Position.
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append(&vertices, px * 0.5)
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append(&vertices, py * 0.5)
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append(&vertices, pz * 0.5)
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// Normal.
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append(&vertices, px)
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append(&vertices, py)
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append(&vertices, pz)
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// UV.
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append(&vertices, x_segment)
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append(&vertices, 1.0 - y_segment)
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// Tangent.
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tx := -math.sin(theta)
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ty := f32(0.0)
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tz := math.cos(theta)
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append(&vertices, tx)
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append(&vertices, ty)
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append(&vertices, tz)
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}
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}
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for y in 0..<Y_SEGMENTS {
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for x in 0..<X_SEGMENTS {
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i0 := u32(y * (X_SEGMENTS + 1) + x)
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i1 := u32((y + 1) * (X_SEGMENTS + 1) + x)
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i2 := u32((y + 1) * (X_SEGMENTS + 1) + x + 1)
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i3 := u32(y * (X_SEGMENTS + 1) + x + 1)
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append(&indices, i0)
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append(&indices, i3)
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append(&indices, i1)
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append(&indices, i1)
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append(&indices, i3)
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append(&indices, i2)
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}
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}
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m, ok := create_mesh(
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renderer = renderer,
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layout = {
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{ "position", 3, size_of(f32), },
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{ "normal", 3, size_of(f32), },
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{ "texture_coords", 2, size_of(f32), },
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{ "tangent", 3, size_of(f32), },
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},
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vertices = vertices[:],
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indices = indices[:],
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)
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return m, ok
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}
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}
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return {}, false
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}
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delete_mesh :: proc(renderer: ^Renderer, mesh: ^Mesh) {
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assert(renderer != nil)
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assert(mesh != nil)
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when RENDER_BACKEND_OPENGL {
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opengl_delete_mesh(renderer, mesh)
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}
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} |