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import Cartesian2 from "../Core/Cartesian2.js";
import ClippingPlaneCollection from "./ClippingPlaneCollection.js";
import CullFace from "./CullFace.js";
import defined from "../Core/defined.js";
import DrawCommand from "../Renderer/DrawCommand.js";
import Pass from "../Renderer/Pass.js";
import PrimitiveType from "../Core/PrimitiveType.js";
import processVoxelProperties from "./processVoxelProperties.js";
import RenderState from "../Renderer/RenderState.js";
import ShaderDestination from "../Renderer/ShaderDestination.js";
import VoxelBoundsCollection from "./VoxelBoundsCollection.js";
import VoxelRenderResources from "./VoxelRenderResources.js";
const textureResolutionScratch = new Cartesian2();
/**
* @function
*
* @param {VoxelPrimitive} primitive
* @param {Context} context
*
* @private
*/
function buildVoxelDrawCommands(primitive, context) {
const renderResources = new VoxelRenderResources(primitive);
processVoxelProperties(renderResources, primitive);
const {
shaderBuilder,
clippingPlanes,
clippingPlanesLength,
renderBoundPlanes,
renderBoundPlanesLength,
} = renderResources;
if (clippingPlanesLength > 0) {
const functionId = "getClippingPlane";
const functionSignature = `vec4 ${functionId}(highp sampler2D packedPlanes, int planeNumber)`;
const textureResolution = ClippingPlaneCollection.getTextureResolution(
clippingPlanes,
context,
textureResolutionScratch,
);
const functionBody = getPlaneFunctionBody(textureResolution);
shaderBuilder.addFunction(
functionId,
functionSignature,
ShaderDestination.FRAGMENT,
);
shaderBuilder.addFunctionLines(functionId, [functionBody]);
}
if (renderBoundPlanesLength > 0) {
const functionId = "getBoundPlane";
const functionSignature = `vec4 ${functionId}(highp sampler2D packedPlanes, int planeNumber)`;
const textureResolution = VoxelBoundsCollection.getTextureResolution(
renderBoundPlanes,
context,
textureResolutionScratch,
);
const functionBody = getPlaneFunctionBody(textureResolution);
shaderBuilder.addFunction(
functionId,
functionSignature,
ShaderDestination.FRAGMENT,
);
shaderBuilder.addFunctionLines(functionId, [functionBody]);
}
// Compile shaders
const shaderBuilderPick = shaderBuilder.clone();
shaderBuilderPick.addDefine("PICKING", undefined, ShaderDestination.FRAGMENT);
const shaderBuilderPickVoxel = shaderBuilder.clone();
shaderBuilderPickVoxel.addDefine(
"PICKING_VOXEL",
undefined,
ShaderDestination.FRAGMENT,
);
const shaderProgram = shaderBuilder.buildShaderProgram(context);
const shaderProgramPick = shaderBuilderPick.buildShaderProgram(context);
const shaderProgramPickVoxel =
shaderBuilderPickVoxel.buildShaderProgram(context);
const renderState = RenderState.fromCache({
cull: {
enabled: true,
face: CullFace.BACK,
},
depthTest: {
enabled: false,
},
depthMask: false,
// internally the shader does premultiplied alpha, so it makes sense to blend that way too
blending: BlendingState.PRE_MULTIPLIED_ALPHA_BLEND,
});
// Create the draw commands
const viewportQuadVertexArray = context.getViewportQuadVertexArray();
const depthTest = primitive._depthTest;
const drawCommand = new DrawCommand({
vertexArray: viewportQuadVertexArray,
primitiveType: PrimitiveType.TRIANGLES,
renderState: renderState,
shaderProgram: shaderProgram,
uniformMap: renderResources.uniformMap,
modelMatrix: primitive._compoundModelMatrix,
pass: Pass.VOXELS,
executeInClosestFrustum: true,
owner: this,
cull: depthTest, // don't cull or occlude if depth testing is off
occlude: depthTest, // don't cull or occlude if depth testing is off
});
// Create the pick draw command
const drawCommandPick = DrawCommand.shallowClone(
drawCommand,
new DrawCommand(),
);
drawCommandPick.shaderProgram = shaderProgramPick;
drawCommandPick.pickOnly = true;
// Create the pick voxels draw command
const drawCommandPickVoxel = DrawCommand.shallowClone(
drawCommand,
new DrawCommand(),
);
drawCommandPickVoxel.shaderProgram = shaderProgramPickVoxel;
drawCommandPickVoxel.pickOnly = true;
// Delete the old shader programs
if (defined(primitive._drawCommand)) {
const command = primitive._drawCommand;
command.shaderProgram =
command.shaderProgram && command.shaderProgram.destroy();
}
if (defined(primitive._drawCommandPick)) {
const command = primitive._drawCommandPick;
command.shaderProgram =
command.shaderProgram && command.shaderProgram.destroy();
}
if (defined(primitive._drawCommandPickVoxel)) {
const command = primitive._drawCommandPickVoxel;
command.shaderProgram =
command.shaderProgram && command.shaderProgram.destroy();
}
primitive._drawCommand = drawCommand;
primitive._drawCommandPick = drawCommandPick;
primitive._drawCommandPickVoxel = drawCommandPickVoxel;
}
function getPlaneFunctionBody(textureResolution) {
const width = textureResolution.x;
const height = textureResolution.y;
const pixelWidth = 1.0 / width;
const pixelHeight = 1.0 / height;
let pixelWidthString = `${pixelWidth}`;
Iif (pixelWidthString.indexOf(".") === -1) {
pixelWidthString += ".0";
}
let pixelHeightString = `${pixelHeight}`;
Iif (pixelHeightString.indexOf(".") === -1) {
pixelHeightString += ".0";
}
return `int pixY = planeNumber / ${width};
int pixX = planeNumber - (pixY * ${width});
// Sample from center of pixel
float u = (float(pixX) + 0.5) * ${pixelWidthString};
float v = (float(pixY) + 0.5) * ${pixelHeightString};
return texture(packedPlanes, vec2(u, v));`;
}
export default buildVoxelDrawCommands;
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