mirror of
https://github.com/photonstorm/phaser
synced 2024-11-27 15:12:18 +00:00
Device and Pipeline WebGL API
This commit is contained in:
Felipe Alfonso
parent
71cee10a55
commit
3eb78fdfea
2 changed files with 519 additions and 0 deletions
185
v3/src/renderer/webgl/backend/Device.js
Normal file
185
v3/src/renderer/webgl/backend/Device.js
Normal file
|
|
@ -0,0 +1,185 @@
|
|||
var PHASER_ASSERT = function (condition, message) {
|
||||
if (!(condition)) {
|
||||
console.error('Assertion Failed: ', message);
|
||||
}
|
||||
}
|
||||
|
||||
// Device works as the WebGL backend. It's the API
|
||||
// that interacts directly with WebGL calls. It's
|
||||
// design to reduce the amount state changes and
|
||||
// redundant gl calls.
|
||||
var Device = function (gl) {
|
||||
this.gl = gl;
|
||||
this.canvas = gl.canvas;
|
||||
this.pipelineState = null;
|
||||
}
|
||||
Device.prototype.clearPipelineState = function () {
|
||||
var gl = this.gl;
|
||||
var canvas = gl.canvas;
|
||||
if (this.pipelineState === null) {
|
||||
this.pipelineState = null;
|
||||
gl.useProgram(null);
|
||||
gl.bindBuffer(gl.ARRAY_BUFFER, null);
|
||||
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
|
||||
gl.disable(gl.BLEND);
|
||||
gl.disable(gl.DEPTH_TEST);
|
||||
gl.enable(gl.STENCIL_TEST);
|
||||
gl.viewport(0, 0, canvas.width, canvas.height);
|
||||
}
|
||||
};
|
||||
Device.prototype.setPipelineState = function (pipelineState) {
|
||||
var vertexInput, inputLayout, elements, elementsCount,
|
||||
viewport, blendState, vertexBuffer, indexBuffer,
|
||||
depthStencilState, gl;
|
||||
|
||||
PHASER_ASSERT(pipelineState != null, 'Invalid pipeline state.');
|
||||
if (this.pipelineState === pipelineState)
|
||||
return;
|
||||
|
||||
this.pipelineState = pipelineState;
|
||||
gl = this.gl;
|
||||
vertexInput = pipelineState.vertexInput;
|
||||
inputLayout = vertexInput.inputLayout;
|
||||
elements = inputLayout.elements;
|
||||
elementsCount = inputLayout.elementsCount;
|
||||
viewport = pipelineState.viewport;
|
||||
blendState = pipelineState.blendState;
|
||||
vertexBuffer = vertexInput.vertexBuffer;
|
||||
indexBuffer = vertexInput.indexBuffer;
|
||||
depthStencilState = pipelineState.depthStencilState;
|
||||
|
||||
// Bind Shader Pipeline
|
||||
gl.useProgram(vertexInput.shaderPipeline.programHandle);
|
||||
|
||||
// Set Viewport
|
||||
gl.viewport(viewport.x, viewport.y, viewport.width, viewport.height);
|
||||
gl.depthRange(viewport.zNear, viewport.zFar);
|
||||
|
||||
// Bind buffers
|
||||
if (vertexBuffer)
|
||||
gl.bindBuffer(gl.ARRAY_BUFFER, vertexBuffer.bufferHandle);
|
||||
|
||||
if (indexBuffer)
|
||||
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer.bufferHandle);
|
||||
|
||||
// Bind Elements
|
||||
for (var index = 0; index < elementsCount; ++index) {
|
||||
var element = elements[index];
|
||||
var elementLocation = element.location;
|
||||
gl.enableVertexAttribArray(elementLocation);
|
||||
gl.vertexAttribPointer(
|
||||
elementLocation,
|
||||
element.size,
|
||||
element.format,
|
||||
gl.FALSE,
|
||||
element.stride,
|
||||
element.offset
|
||||
);
|
||||
}
|
||||
|
||||
// Bind blend state
|
||||
if (blendState && blendState.enabled) {
|
||||
gl.enable(gl.BLEND);
|
||||
gl.logicOp(blendState.logicOperator);
|
||||
gl.blendEquationSeparate(blendState.rgbEquation, blendState.alphaEquation);
|
||||
gl.blendFuncSeparate(blendState.sourceRgb, blendState.destinationRgb, blendState.sourceAlpha, blendState.destinationAlpha);
|
||||
} else {
|
||||
gl.disable(gl.BLEND);
|
||||
}
|
||||
|
||||
// Bind depth state
|
||||
if (depthStencilState && depthStencilState.depthEnabled) {
|
||||
gl.enable(gl.DEPTH_TEST);
|
||||
gl.depthMask(depthStencilState.depthWriteMask);
|
||||
gl.depthFunc(depthStencilState.depthFunction);
|
||||
} else {
|
||||
gl.disable(gl.DEPTH_TEST);
|
||||
}
|
||||
|
||||
// Bind stencil state
|
||||
if (depthStencilState && depthStencilState.stencilEnabled) {
|
||||
gl.enable(gl.STENCIL_TEST);
|
||||
gl.stencilOp(
|
||||
depthStencilState.stencilFail,
|
||||
depthStencilState.stencilZFail,
|
||||
depthStencilState.stencilZPass
|
||||
);
|
||||
gl.stencilFunc(
|
||||
depthStencilState.stencilFunction,
|
||||
1, 0xFF
|
||||
);
|
||||
} else {
|
||||
gl.disable(gl.STENCIL_TEST);
|
||||
}
|
||||
};
|
||||
Device.prototype.setTexture2D = function (texture2D) {
|
||||
var gl = this.gl;
|
||||
gl.activeTexture(gl.TEXTURE0 + texture2D.unit);
|
||||
gl.bindTexture(gl.TEXTURE_2D, texture2D.textureHandle);
|
||||
};
|
||||
Device.prototype.setTextureCube = function (textureCube) {
|
||||
var gl = this.gl;
|
||||
gl.activeTexture(gl.TEXTURE0 + textureCube.unit);
|
||||
gl.bindTexture(gl.TEXTURE_CUBE_MAP, textureCube.textureHandle);
|
||||
};
|
||||
Device.prototype.updateVertexBuffer = function () {
|
||||
var gl = this.gl;
|
||||
var vertexBuffer = this.pipelineState.vertexInput.vertexBuffer;
|
||||
gl.bufferSubData(gl.ARRAY_BUFFER, 0, vertexBuffer.bufferSize, vertexBuffer.bufferHost);
|
||||
};
|
||||
Device.prototype.updateIndexBuffer = function () {
|
||||
var gl = this.gl;
|
||||
var indexBuffer = this.pipelineState.vertexInput.indexBuffer;
|
||||
gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, indexBuffer.bufferSize, indexBuffer.bufferHost);
|
||||
};
|
||||
Device.prototype.updateConstantBuffer = function () {
|
||||
var elements = this.pipelineState.constantBuffer.elements;
|
||||
var elementsCount = this.pipelineState.constantBuffer.elementsCount;
|
||||
for (var index = 0; index < elementsCount; ++index) {
|
||||
elements[index].update();
|
||||
}
|
||||
};
|
||||
Device.prototype.updateSubVertexBuffer = function (offset, byteSize) {
|
||||
var gl = this.gl;
|
||||
var vertexBuffer = this.pipelineState.vertexInput.vertexBuffer;
|
||||
gl.bufferSubData(gl.ARRAY_BUFFER, offset, byteSize, vertexBuffer.bufferHost);
|
||||
};
|
||||
Device.prototype.updateSubIndexBuffer = function (offset, byteSize) {
|
||||
var gl = this.gl;
|
||||
var indexBuffer = this.pipelineState.vertexInput.indexBuffer;
|
||||
gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, offset, byteSize, indexBuffer.bufferHost);
|
||||
};
|
||||
Device.prototype.drawIndexed = function (indexCount, startIndexLocation) {
|
||||
var gl = this.gl;
|
||||
var vertexInput = this.pipelineState.vertexInput;
|
||||
gl.drawElements(vertexInput.primitiveTopology, indexCount, vertexInput.indexBuffer.format, startIndexLocation);
|
||||
};
|
||||
Device.prototype.draw = function (vertexCount, startVertexLocation) {
|
||||
var gl = this.gl;
|
||||
var vertexInput = this.pipelineState.vertexInput;
|
||||
gl.drawArrays(vertexInput.primitiveTopology, startVertexLocation, vertexCount);
|
||||
};
|
||||
Device.prototype.setClearColor = function (red, green, blue, alpha) {
|
||||
|
||||
this.gl.clearColor(red, green, blue, alpha);
|
||||
};
|
||||
Device.prototype.setClearDepth = function (depth) {
|
||||
|
||||
this.gl.clearDepth(depth);
|
||||
};
|
||||
Device.prototype.setClearStencil = function (stencil) {
|
||||
|
||||
this.gl.clearStencil(stencil);
|
||||
};
|
||||
Device.prototype.clearColorBuffer = function () {
|
||||
var gl = this.gl;
|
||||
gl.clear(gl.COLOR_BUFFER_BIT);
|
||||
};
|
||||
Device.prototype.clearDepthStencilBuffer = function () {
|
||||
var gl = this.gl;
|
||||
gl.clear(gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
|
||||
};
|
||||
Device.prototype.clearAllBuffers = function () {
|
||||
var gl = this.gl;
|
||||
gl.clear(gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT | gl.COLOR_BUFFER_BIT);
|
||||
};
|
||||
334
v3/src/renderer/webgl/backend/Pipeline.js
Normal file
334
v3/src/renderer/webgl/backend/Pipeline.js
Normal file
|
|
@ -0,0 +1,334 @@
|
|||
var CompileShader = function (gl, shaderType, shaderSource) {
|
||||
var shader = null;
|
||||
PHASER_ASSERT(shaderType === gl.VERTEX_SHADER || shaderType === gl.FRAGMENT_SHADER, "Invalid Shader Type");
|
||||
shader = gl.createShader(shaderType);
|
||||
gl.shaderSource(shader, shaderSource);
|
||||
gl.compileShader(shader);
|
||||
PHASER_ASSERT(gl.getShaderParameter(shader, gl.COMPILE_STATUS), "Failed shader compilation. Error: \n" + gl.getShaderInfoLog(shader));
|
||||
return shader;
|
||||
}
|
||||
|
||||
// Used by the constant buffer. Needed to simulate
|
||||
// UBO
|
||||
var ConstantElement = function (gl, shaderPipeline, descriptor) {
|
||||
this.location = gl.getUniformLocation(shaderPipeline.programHandle, descriptor.name);
|
||||
this.transpose = descriptor.transpose ? true : false;
|
||||
this.dataReference = descriptor.dataReference;
|
||||
if (!ArrayBuffer.isView(this.dataReference)) {
|
||||
console.error('Constant data reference must be a typed array.');
|
||||
return;
|
||||
}
|
||||
|
||||
switch (descriptor.type) {
|
||||
case PipelineState.TYPE_FLOAT:
|
||||
PHASER_ASSERT((this.dataReference instanceof Float32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform1fv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_INT:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform1iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_BOOL:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform1iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_FLOAT_VEC2:
|
||||
PHASER_ASSERT((this.dataReference instanceof Float32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform2fv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_INT_VEC2:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform2iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_BOOL_VEC2:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform2iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_FLOAT_VEC3:
|
||||
PHASER_ASSERT((this.dataReference instanceof Float32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform3fv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_INT_VEC3:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform3iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_BOOL_VEC3:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform3iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_FLOAT_VEC4:
|
||||
PHASER_ASSERT((this.dataReference instanceof Float32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform4fv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_INT_VEC4:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform4iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_BOOL_VEC4:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform4iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_MAT2:
|
||||
PHASER_ASSERT((this.dataReference instanceof Float32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniformMatrix2fv(this.location, this.transpose, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_MAT3:
|
||||
PHASER_ASSERT((this.dataReference instanceof Float32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniformMatrix3fv(this.location, this.transpose, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_MAT4:
|
||||
PHASER_ASSERT((this.dataReference instanceof Float32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniformMatrix4fv(this.location, this.transpose, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_SAMPLER_2D:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform1iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
case PipelineState.TYPE_SAMPLER_CUBE:
|
||||
PHASER_ASSERT((this.dataReference instanceof Int32Array), 'Invalid type for constant refenrece data');
|
||||
this.update = function () {
|
||||
gl.uniform1iv(this.location, this.dataReference);
|
||||
};
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
ConstantElement.TYPE_FLOAT = 0;
|
||||
ConstantElement.TYPE_INT = 1;
|
||||
ConstantElement.TYPE_BOOL = 2;
|
||||
ConstantElement.TYPE_FLOAT_VEC2 = 3;
|
||||
ConstantElement.TYPE_INT_VEC2 = 4;
|
||||
ConstantElement.TYPE_BOOL_VEC2 = 5;
|
||||
ConstantElement.TYPE_FLOAT_VEC3 = 6;
|
||||
ConstantElement.TYPE_INT_VEC3 = 7;
|
||||
ConstantElement.TYPE_BOOL_VEC3 = 8;
|
||||
ConstantElement.TYPE_FLOAT_VEC4 = 9;
|
||||
ConstantElement.TYPE_INT_VEC4 = 10;
|
||||
ConstantElement.TYPE_BOOL_VEC4 = 11;
|
||||
ConstantElement.TYPE_MAT2 = 12;
|
||||
ConstantElement.TYPE_MAT3 = 13;
|
||||
ConstantElement.TYPE_MAT4 = 14;
|
||||
ConstantElement.TYPE_SAMPLER_2D = 15;
|
||||
ConstantElement.TYPE_SAMPLER_CUBE = 16;
|
||||
|
||||
// Describes a Constant buffer. This will try to
|
||||
// simulate UBO.
|
||||
var ConstantBuffer = function (gl, shaderPipeline, elementsDescArray) {
|
||||
this.elements = [];
|
||||
for (var index = 0, length = elementsDescArray.length; index < length; ++index) {
|
||||
this.elements.push(new ConstantElement(gl, shaderPipeline, elementsDescArray[index]));
|
||||
}
|
||||
this.elementsCount = this.elements.length;
|
||||
}
|
||||
|
||||
// Describes a Viewport
|
||||
var Viewport = function (gl, descriptor) {
|
||||
this.x = descriptor.x;
|
||||
this.y = descriptor.y;
|
||||
this.width = descriptor.width;
|
||||
this.height = descriptor.height;
|
||||
this.zNear = descriptor.zNear;
|
||||
this.zFar = descriptor.zFar;
|
||||
}
|
||||
|
||||
// Describes a Shader Pipeline. This means a compiled and linked
|
||||
// list of shaders
|
||||
var ShaderPipeline = function (gl, descriptor) {
|
||||
var program = gl.createProgram();
|
||||
var vertexShader = CompileShader(gl, gl.VERTEX_SHADER, descriptor.vertexShader);
|
||||
var fragmentShader = CompileShader(gl, gl.FRAGMENT_SHADER, descriptor.fragmentShader);
|
||||
gl.attachShader(program, vertexShader);
|
||||
gl.attachShader(program, fragmentShader);
|
||||
gl.linkProgram(program);
|
||||
gl.validateProgram(program);
|
||||
PHASER_ASSERT(gl.getProgramParameter(program, gl.LINK_STATUS), "Failed to link program. Error: \n" + gl.getProgramInfoLog(program));
|
||||
this.vertexShader = vertexShader;
|
||||
this.fragmentShader = fragmentShader;
|
||||
this.programHandle = program;
|
||||
}
|
||||
|
||||
// Describes a 2D texture. It'll contain it's own texture unit and dimensions
|
||||
var Texture2D = function (gl, descriptor) {
|
||||
var texture = gl.createTexture();
|
||||
gl.bindTexture(gl.TEXTURE_2D, texture);
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, descriptor.wrap_mode);
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, descriptor.wrap_mode);
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, descriptor.filter);
|
||||
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, descriptor.filter);
|
||||
if (!ArrayBuffer.isView(descriptor.pixels)) {
|
||||
gl.texImage2D(
|
||||
gl.TEXTURE_2D,
|
||||
descriptor.mipLevels,
|
||||
descriptor.internalFormat,
|
||||
descriptor.format,
|
||||
descriptor.type,
|
||||
descriptor.pixels
|
||||
);
|
||||
} else {
|
||||
gl.texImage2D(
|
||||
gl.TEXTURE_2D,
|
||||
descriptor.mipLevels,
|
||||
descriptor.internalFormat,
|
||||
descriptor.width,
|
||||
descriptor.height,
|
||||
descriptor.border,
|
||||
descriptor.format,
|
||||
descriptor.type,
|
||||
descriptor.pixels
|
||||
);
|
||||
}
|
||||
this.textureHandle = texture;
|
||||
this.unit = descriptor.unit;
|
||||
this.width = descriptor.width;
|
||||
this.height = descriptor.height;
|
||||
}
|
||||
|
||||
// Describes a Vertex Buffer. It'll be used by the Vertex Input
|
||||
var VertexBuffer = function (gl, descriptor) {
|
||||
var buffer = gl.createBuffer();
|
||||
var bufferSize = 0;
|
||||
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
|
||||
if (descriptor.data && descriptor.initialCopy) {
|
||||
gl.bufferData(gl.ARRAY_BUFFER, descriptor.data, descriptor.usage);
|
||||
bufferSize = descriptor.data.byteLength;
|
||||
} else {
|
||||
gl.bufferData(gl.ARRAY_BUFFER, descriptor.bufferSize, descriptor.usage);
|
||||
bufferSize = descriptor.bufferSize;
|
||||
}
|
||||
this.bufferHandle = buffer;
|
||||
this.bufferSize = bufferSize;
|
||||
this.bufferHost = descriptor.bufferHost;
|
||||
}
|
||||
|
||||
// Describes a Index Buffer. It'll be used by the Vertex Input
|
||||
var IndexBuffer = function (gl, descriptor) {
|
||||
var buffer = gl.createBuffer();
|
||||
var bufferSize = 0;
|
||||
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
|
||||
if (descriptor.data && descriptor.initialCopy) {
|
||||
gl.bufferData(gl.ARRAY_BUFFER, descriptor.data, descriptor.usage);
|
||||
bufferSize = descriptor.data.byteLength;
|
||||
} else {
|
||||
gl.bufferData(gl.ARRAY_BUFFER, descriptor.bufferSize, descriptor.usage);
|
||||
bufferSize = descriptor.bufferSize;
|
||||
}
|
||||
this.bufferHandle = buffer;
|
||||
this.bufferSize = bufferSize;
|
||||
this.bufferHost = descriptor.bufferHost;
|
||||
this.indexFormat = descriptor.indexFormat;
|
||||
}
|
||||
|
||||
// Describes a Blend State. Functions, operations and equations.
|
||||
var BlendState = function (gl, descriptor) {
|
||||
this.enabled = descriptor.enabled;
|
||||
this.logicOperation = descriptor.logicOperation;
|
||||
this.rgbEquation = descriptor.rgbEquation;
|
||||
this.sourceRgb = descriptor.sourceRgb;
|
||||
this.destinationRgb = descriptor.destinationRgb;
|
||||
this.alphaEquation = descriptor.alphaEquation;
|
||||
this.sourceAlpha = descriptor.sourceAlpha;
|
||||
this.destinationAlpha = descriptor.destinationAlpha;
|
||||
}
|
||||
|
||||
// Describes a Depth-Stencil State. Functions and operations
|
||||
var DepthStencilState = function (gl, descriptor) {
|
||||
this.stencilEnabled = descriptor.stencilEnabled;
|
||||
this.depthEnabled = descriptor.depthEnabled;
|
||||
this.depthFunction = descriptor.depthFunction;
|
||||
this.depthWriteMask = descriptor.depthWriteMask;
|
||||
this.stencilFunction = descriptor.stencilFunction;
|
||||
this.stencilFail = descriptor.stencilFail;
|
||||
this.stencilZFail = descriptor.stencilZFail;
|
||||
this.stencilZPass = descriptor.stencilZPass;
|
||||
}
|
||||
|
||||
// Describes an Element Layout. Used by the Vertex Input.
|
||||
// An element layout is how vertex attributes is display in GPU memory
|
||||
var ElementLayout = function (gl, shaderPipeline, descriptor) {
|
||||
this.location = gl.getAttribLocation(shaderPipeline.programHandle, descriptor.name);
|
||||
this.size = descriptor.size;
|
||||
this.offset = descriptor.offset;
|
||||
this.stride = descriptor.stride;
|
||||
this.format = descriptor.format;
|
||||
}
|
||||
|
||||
// Describes a Input Layout. Input layout is a collection of element layout.
|
||||
var InputLayout = function (gl, shaderPipeline, elementsDescArray) {
|
||||
this.elements = [];
|
||||
for (var index = 0, length = elementsDescArray.length; index < length; ++index) {
|
||||
this.elements.push(new ElementLayout(gl, shaderPipeline, elementsDescArray[index]));
|
||||
}
|
||||
this.elementsCount = this.elements.length;
|
||||
}
|
||||
|
||||
// Describes a Render Target. A render target has depth-stencil and color buffers
|
||||
var RenderTarget = function (gl, descriptor) {}
|
||||
|
||||
// Describes a Vertex Input set. This is what WebGL will use to
|
||||
// define how it handles vertex data. Vertex Input internally describes
|
||||
// a primitive topology, vertex buffer, index buffer, input layout and
|
||||
// a shader pipeline.
|
||||
var VertexInput = function (gl, descriptor) {
|
||||
var vertexBufferDescriptor = descriptor.vertexBuffer;
|
||||
var indexBufferDescriptor = descriptor.indexBuffer;
|
||||
var shaderPipelineDescriptor = descriptor.shaderPipeline;
|
||||
var inputLayoutDescriptor = descriptor.inputLayout;
|
||||
|
||||
this.primitiveTopology = descriptor.primitiveTopology;
|
||||
this.vertexBuffer = vertexBufferDescriptor ? new VertexBuffer(gl, vertexBufferDescriptor) : null;
|
||||
this.indexBuffer = indexBufferDescriptor ? new IndexBuffer(gl, indexBufferDescriptor) : null;
|
||||
this.shaderPipeline = shaderPipelineDescriptor ? new ShaderPipeline(gl, shaderPipelineDescriptor) : null;
|
||||
this.inputLayout = inputLayoutDescriptor ? new InputLayout(gl, this.shaderPipeline, inputLayoutDescriptor) : null;
|
||||
}
|
||||
|
||||
// Describes a Pipeline State. This is uploaded once to the GPU with
|
||||
// vertex input, viewport, blend and depth-stencil states.
|
||||
// Pipeline states are fixed states. This will reduce the need to sync
|
||||
// GL states with GPU. This would give the potential of future optimizations
|
||||
// like designing a pararllel renderer using a stateless render queue by simply
|
||||
// passing a state-stamp with the draw call commands.
|
||||
var PipelineState = function (gl, descriptor) {
|
||||
var vertexInputDescriptor = descriptor.vertexInput;
|
||||
var viewportDescriptor = descriptor.viewport;
|
||||
var blendStateDescriptor = descriptor.blendState;
|
||||
var depthStencilStateDescriptor = descriptor.depthStencilState;
|
||||
var constantBufferDescriptor = descriptor.constantBuffer;
|
||||
|
||||
this.vertexInput = vertexInputDescriptor ? new VertexInput(gl, vertexInputDescriptor) : null;
|
||||
this.viewport = viewportDescriptor ? new Viewport(gl, viewportDescriptor) : null;
|
||||
this.blendState = blendStateDescriptor ? new BlendState(gl, blendStateDescriptor) : null;
|
||||
this.depthStencilState = depthStencilStateDescriptor ? new DepthStencilState(gl, depthStencilStateDescriptor) : null;
|
||||
this.constantBuffer = constantBufferDescriptor ? new ConstantBuffer(gl, this.vertexInput.shaderPipeline, constantBufferDescriptor) : null;
|
||||
}
|
||||
Loading…
Reference in a new issue