Spheres/primitive built-in meshes, cull-modes, vec4 uniforms

pass.odin

@@ -2,6 +2,7 @@ package renderer
 
 import "core:math/linalg"
 import "core:fmt"
+import "core:log"
 
 MAX_DRAW_COMMANDS_CAPACITY :: 4096
 MAX_POST_PROCESS_NODES_PER_PASS :: 8
@@ -19,6 +20,7 @@ Pass_Type :: union {
 Scene_Pass :: struct {
     blend_mode: Blend_Mode,
     sort_mode: Sort_Mode,
+    cull_mode: Cull_Mode,
     
     draw_commands: [dynamic]Draw_Command, // Capacity is 'MAX_DRAW_COMMANDS_CAPACITY'.
 
@@ -31,10 +33,21 @@ Post_Processing_Pass :: struct {
 
 Uniform :: union {
     Uniform_Texture,
+
     Uniform_Float,
+    Uniform_Float_Pointer,
+    
     Uniform_Matrix4f32,
+    Uniform_Matrix4f32_Pointer,
+
     Uniform_Vector3,
+    Uniform_Vector3_Pointer,
+
+    Uniform_Vector4,
+    Uniform_Vector4_Pointer,
+
     Uniform_Color,
+    Uniform_Color_Pointer,
 }
 
 Uniform_Texture :: struct {
@@ -43,21 +56,46 @@ Uniform_Texture :: struct {
 }
 
 Uniform_Float :: struct {
+    name: string,
+    value: f32,
+}
+Uniform_Float_Pointer :: struct {
     name: string,
     value: ^f32,
 }
 
 Uniform_Matrix4f32 :: struct {
+    name: string,
+    value: linalg.Matrix4f32,
+}
+Uniform_Matrix4f32_Pointer :: struct {
     name: string,
     value: ^linalg.Matrix4f32,
 }
 
 Uniform_Vector3 :: struct {
+    name: string,
+    value: [3]f32,
+}
+Uniform_Vector3_Pointer :: struct {
     name: string,
     value: ^[3]f32,
 }
 
+Uniform_Vector4 :: struct {
+    name: string,
+    value: [4]f32,
+}
+Uniform_Vector4_Pointer :: struct {
+    name: string,
+    value: ^[4]f32,
+}
+
 Uniform_Color :: struct {
+    name: string,
+    value: Color,
+}
+Uniform_Color_Pointer :: struct {
     name: string,
     value: ^Color,
 }
@@ -69,16 +107,46 @@ Post_Processing_Node :: struct {
     program: ^Shader_Program,
 }
 
+// TODO: SS - Create a pool of 'Draw_Command's and reuse them.
+
+MAX_UNIFORMS_PER_DRAW_COMMAND :: 8
+
 Draw_Command :: struct {
     renderer: ^Renderer, // Needed for sorting.
 
     mesh: Mesh,
     material: Material,
+    uniforms: [MAX_UNIFORMS_PER_DRAW_COMMAND]Uniform,
+    uniform_count: u8,
+    
     position: [3]f32,
     rotation: [3]f32,
     scale: [3]f32,
 }
 
+create_draw_command :: proc(renderer: ^Renderer, mesh: Mesh, material: Material, uniforms: []Uniform, position, rotation, scale: [3]f32, loc := #caller_location) -> Draw_Command {
+    dc: Draw_Command
+
+    dc.renderer = renderer
+    dc.mesh = mesh
+    dc.material = material
+    dc.position = position
+    dc.rotation = rotation
+    dc.scale = scale
+
+    for u in uniforms {
+        if dc.uniform_count >= MAX_UNIFORMS_PER_DRAW_COMMAND {
+            log.warnf("Hit max capacity (%v) of uniforms per draw command! %v", MAX_UNIFORMS_PER_DRAW_COMMAND, loc)
+            break
+        }
+        
+        dc.uniforms[dc.uniform_count] = u
+        dc.uniform_count += 1
+    }
+    
+    return dc
+}
+
 Blend_Mode :: enum {
     None,
     Alpha,
@@ -117,10 +185,18 @@ Sort_Mode :: enum {
     Front_To_Back, // Sorts the commands in the 'draw_commmands' array (from front to back) before drawing them.
 }
 
+Cull_Mode :: enum {
+    None,
+    Back,
+    Front,
+    Front_Back,
+}
+
 create_scene_pass :: proc(
     name: string,
     blend_mode: Blend_Mode,
     sort_mode: Sort_Mode,
+    cull_mode: Cull_Mode,
     output_rt: ^Render_Target,
 ) -> Pass
 {
@@ -131,6 +207,7 @@ create_scene_pass :: proc(
     p.type = Scene_Pass {
         blend_mode = blend_mode,
         sort_mode = sort_mode,
+        cull_mode = cull_mode,
 
         draw_commands = make([dynamic]Draw_Command, 0, MAX_DRAW_COMMANDS_CAPACITY),
 
@@ -194,7 +271,83 @@ add_command_to_pass :: proc(renderer: ^Renderer, pass: ^Pass, command: Draw_Comm
             assert(err == .None)
         }
     }
-    
 
     return true
+}
+
+execute_pass :: proc(renderer: ^Renderer, pass: ^Pass, view_matrix, projection_matrix: linalg.Matrix4x4f32) { // TODO: SS - Move to 'pass.odin'.
+    // fmt.printfln("Executing pass '%v'.", pass.name)
+    
+    assert(renderer != nil)
+    assert(pass != nil)
+    
+    switch &t in &pass.type {
+        case Scene_Pass: {
+            apply_polygon_mode(renderer, renderer.polygon_mode)
+            
+            assert(t.output_rt != nil)
+            bind_render_target(renderer, t.output_rt)
+            defer bind_render_target(renderer, nil)
+
+            should_write_depth := t.output_rt.depth_texture != nil
+            should_test_depth  := should_write_depth
+            should_clear_depth := should_write_depth
+
+            should_clear_color := true
+            set_clear_color(renderer, RGBA_Color { 0, 0, 0, 0 })
+
+            clear_screen(renderer, should_clear_color, should_clear_depth)
+            apply_depth(renderer, should_test_depth, should_write_depth)
+        
+            apply_blend_mode(renderer, t.blend_mode)
+            defer apply_blend_mode(renderer, .None)
+
+            apply_cull_mode(renderer, t.cull_mode)
+            defer apply_cull_mode(renderer, .None)
+        
+            sort_draw_commands(renderer, &t)
+        
+            for &dc in &t.draw_commands { // TODO: SS - Don't think we need the address of the draw-commands.
+                model_matrix := linalg.identity(linalg.Matrix4x4f32)
+        
+                // Translate.
+                translation := linalg.matrix4_translate(dc.position)
+                
+                // Rotate.
+                rot_x := linalg.matrix4_rotate(linalg.to_radians(dc.rotation.x), [3]f32 { 1, 0, 0 })
+                rot_y := linalg.matrix4_rotate(linalg.to_radians(dc.rotation.y), [3]f32 { 0, 1, 0 })
+                rot_z := linalg.matrix4_rotate(linalg.to_radians(dc.rotation.z), [3]f32 { 0, 0, 1 })
+                rotation := rot_z * rot_y * rot_x
+                
+                // Scale.
+                scale := linalg.matrix4_scale(dc.scale)
+        
+                model_matrix *= translation * rotation * scale
+
+                // Apply uniforms.
+                activate_material(&dc.material, model_matrix, view_matrix, projection_matrix)
+                if dc.uniform_count > 0 {
+                    set_shader_uniforms(dc.material.shader_program, dc.uniforms[:dc.uniform_count])
+                }
+        
+                // Draw the mesh.
+                draw_mesh(&dc.mesh)
+            }
+
+            // Clear the pass' draw-commands.
+            clear(&t.draw_commands)
+
+            // TODO: SS - "Deactivate" the pass?
+
+            apply_polygon_mode(renderer, .Fill)
+        }
+        case Post_Processing_Pass: {
+            // Execute the post-processing nodes.
+            for &pp in &t.post_processing_nodes {
+                execute_post_processing_node(renderer, &pp, view_matrix, projection_matrix)
+            }
+
+            // TODO: SS - "Deactivate" the pass?
+        }
+    }
 }