I need a guide on how to use Graphics5.
Here's my attempt below (I followed the Kha 3D tutorial by Lubos Lenco):
package exp;
import kha.Framebuffer;
import kha.Color;
import kha.Shaders;
import kha.graphics5.RenderTarget;
import kha.graphics5.TextureFormat;
import kha.graphics4.DepthStencilFormat;
import kha.graphics5.CommandList;
import kha.graphics5.PipelineState;
import kha.graphics5.VertexStructure;
import kha.graphics5.VertexBuffer;
import kha.graphics5.IndexBuffer;
import kha.graphics5.FragmentShader;
import kha.graphics5.VertexShader;
import kha.graphics5.VertexData;
import kha.graphics5.Usage;
import kha.Image;
class Scene {
public var width:Int;
public var height:Int;
public var commands:CommandList;
public var renderTarget:RenderTarget;
var vertexBuffer:VertexBuffer;
var indexBuffer:IndexBuffer;
var pipeline:PipelineState;
// An array of 3 vectors representing 3 vertices to form a triangle
static var vertices:Array<Float> = [
-1.0, -1.0, 0.0, // Bottom-left
1.0, -1.0, 0.0, // Bottom-right
0.0, 1.0, 0.0 // Top
];
// Indices for our triangle, these will point to vertices above
static var indices:Array<Int> = [
0, // Bottom-left
1, // Bottom-right
2 // Top
];
public function new(width:Int, height:Int) {
this.width = width;
this.height = height;
this.commands = new CommandList();
this.renderTarget = new RenderTarget(width, height, 0, true, TextureFormat.RGBA32, NoDepthAndStencil, 0);
// Define vertex structure
var structure = new VertexStructure();
structure.add("pos", VertexData.Float3);
// Save length - we only store position in vertices for now
// Eventually there will be texture coords, normals,...
var structureLength = 3;
// Compile pipeline state
// Shaders are located in 'Sources/Shaders' directory
// and Kha includes them automatically
pipeline = new PipelineState();
pipeline.inputLayout = [structure];
pipeline.fragmentShader = cast Shaders.simple_frag;
pipeline.vertexShader = cast Shaders.simple_vert;
pipeline.compile();
// Create vertex buffer
vertexBuffer = new VertexBuffer(
Std.int(vertices.length / 3), // Vertex count - 3 floats per vertex
structure, // Vertex structure
Usage.StaticUsage // Vertex data will stay the same
);
// Copy vertices to vertex buffer
var vbData = vertexBuffer.lock();
for (i in 0...vbData.length) {
vbData.set(i, vertices[i]);
}
vertexBuffer.unlock();
// Create index buffer
indexBuffer = new IndexBuffer(
indices.length, // 3 indices for our triangle
Usage.StaticUsage // Index data will stay the same
);
// Copy indices to index buffer
var iData = indexBuffer.lock();
for (i in 0...iData.length) {
iData[i] = indices[i];
}
indexBuffer.unlock();
}
public function update() {}
public function render(frame:Framebuffer) {
// A graphics object which lets us perform 3D operations
var g = frame.g5;
// Begin rendering
g.renderTargetsInvertedY();
g.begin(renderTarget);
commands.begin();
// commands.setRenderTargets([renderTarget]);
// commands.renderTargetToFramebufferBarrier(renderTarget);
// Bind state we want to draw with
commands.setPipeline(pipeline);
// Bind data we want to draw
commands.setVertexBuffers([vertexBuffer], [1]);
commands.setIndexBuffer(indexBuffer);
// Draw!
commands.drawIndexedVertices();
// commands.clear(renderTarget, Color.Yellow);
commands.end();
// End rendering
g.end();
g.swapBuffers();
}
}
I tried to build on MacOS Mojave, but the app crashed.
