public void DrawScene()
{
gl.Viewport(0, 0, canvas.Width, canvas.Height);
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
Mat4.Perspective(45, (double)canvas.Width / canvas.Height, 0.1, 100, pMatrix);
Mat4.Identity(mvMatrix);
Mat4.Translate(mvMatrix, new double[] { 0.0, 0.0, z });
Mat4.Rotate(mvMatrix, this.DegToRad(xRotation), new double[] { 1, 0, 0 });
Mat4.Rotate(mvMatrix, this.DegToRad(yRotation), new double[] { 0, 1, 0 });
gl.BindBuffer(gl.ARRAY_BUFFER, this.cubeVertexPositionBuffer);
gl.VertexAttribPointer(this.vertexPositionAttribute, 3, gl.FLOAT, false, 0, 0);
gl.BindBuffer(gl.ARRAY_BUFFER, this.cubeVertexNormalBuffer);
gl.VertexAttribPointer(this.vertexNormalAttribute, 3, gl.FLOAT, false, 0, 0);
gl.BindBuffer(gl.ARRAY_BUFFER, this.cubeVertexTextureCoordBuffer);
gl.VertexAttribPointer(this.textureCoordAttribute, 2, gl.FLOAT, false, 0, 0);
gl.ActiveTexture(gl.TEXTURE0);
gl.BindTexture(gl.TEXTURE_2D, this.texture);
gl.Uniform1i(this.samplerUniform, 0);
// Add Blending
if (this.useBlending)
{
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE);
gl.Enable(gl.BLEND);
gl.Disable(gl.DEPTH_TEST);
gl.Uniform1f(this.alphaUniform, this.alpha);
}
else
{
gl.Disable(gl.BLEND);
gl.Enable(gl.DEPTH_TEST);
gl.Uniform1f(this.alphaUniform, 1);
}
// Add Lighting
gl.Uniform1i(this.useLightingUniform, this.useLighting);
if (this.useLighting)
{
gl.Uniform3f(this.ambientColorUniform, this.ambientR, this.ambientG, this.ambientB);
var lightingDirection = new double[] { this.lightDirectionX, this.lightDirectionY, this.lightDirectionZ };
var adjustedLD = Vec3.Create();
Vec3.Normalize(lightingDirection, adjustedLD);
Vec3.Scale(adjustedLD, -1);
gl.Uniform3fv(this.lightingDirectionUniform, adjustedLD);
gl.Uniform3f(this.directionalColorUniform, this.directionalR, this.directionalG, this.directionalB);
}
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.cubeVertexIndexBuffer);
this.SetMatrixUniforms();
gl.DrawElements(gl.TRIANGLES, 36, gl.UNSIGNED_SHORT, 0);
}
private void DrawSprite(Sprite sprite)
{
Mat4.Perspective(45, (double)canvas.Width / canvas.Height, 0.1, 1000, pMatrix);
Mat4.Identity(mvMatrix);
Scale(mvMatrix, sprite.Width, sprite.Height);
Mat4.Translate(mvMatrix, new double[] { sprite.X / sprite.Width, sprite.Y / sprite.Height, -12 });
//Mat4.Rotate(mvMatrix, this.DegToRad(xRotation), new double[] { 1, 0, 0 });
//Mat4.Rotate(mvMatrix, this.DegToRad(yRotation), new double[] { 0, 1, 0 });
WebGlRenderingContext.BindBuffer(WebGlRenderingContext.ARRAY_BUFFER, this.cubeVertexPositionBuffer);
WebGlRenderingContext.VertexAttribPointer(this.vertexPositionAttribute, 3, WebGlRenderingContext.FLOAT, false, 0, 0);
WebGlRenderingContext.BindBuffer(WebGlRenderingContext.ARRAY_BUFFER, this.cubeVertexNormalBuffer);
WebGlRenderingContext.VertexAttribPointer(this.vertexNormalAttribute, 3, WebGlRenderingContext.FLOAT, false, 0, 0);
WebGlRenderingContext.BindBuffer(WebGlRenderingContext.ARRAY_BUFFER, this.cubeVertexTextureCoordBuffer);
WebGlRenderingContext.VertexAttribPointer(this.textureCoordAttribute, 2, WebGlRenderingContext.FLOAT, false, 0, 0);
WebGlRenderingContext.ActiveTexture(WebGlRenderingContext.TEXTURE0);
WebGlRenderingContext.BindTexture(WebGlRenderingContext.TEXTURE_2D, sprite.Texture.WebGLTexture);
WebGlRenderingContext.Uniform1i(this.samplerUniform, 0);
// Add Blending
if (this.useBlending)
{
WebGlRenderingContext.BlendFunc(WebGlRenderingContext.SRC_ALPHA, WebGlRenderingContext.ONE);
WebGlRenderingContext.Enable(WebGlRenderingContext.BLEND);
WebGlRenderingContext.Disable(WebGlRenderingContext.DEPTH_TEST);
WebGlRenderingContext.Uniform1f(this.alphaUniform, this.alpha);
}
else
{
WebGlRenderingContext.Disable(WebGlRenderingContext.BLEND);
WebGlRenderingContext.Enable(WebGlRenderingContext.DEPTH_TEST);
WebGlRenderingContext.Uniform1f(this.alphaUniform, 1);
}
// Add Lighting
WebGlRenderingContext.Uniform1i(this.useLightingUniform, this.useLighting);
if (this.useLighting)
{
WebGlRenderingContext.Uniform3f(this.ambientColorUniform, this.ambientR, this.ambientG, this.ambientB);
var lightingDirection = new double[] { this.lightDirectionX, this.lightDirectionY, this.lightDirectionZ };
var adjustedLD = Vec3.Create();
Vec3.Normalize(lightingDirection, adjustedLD);
Vec3.Scale(adjustedLD, -1);
WebGlRenderingContext.Uniform3fv(this.lightingDirectionUniform, adjustedLD);
WebGlRenderingContext.Uniform3f(this.directionalColorUniform, this.directionalR, this.directionalG, this.directionalB);
}
WebGlRenderingContext.BindBuffer(WebGlRenderingContext.ELEMENT_ARRAY_BUFFER, this.cubeVertexIndexBuffer);
this.SetMatrixUniforms();
WebGlRenderingContext.DrawElements(WebGlRenderingContext.TRIANGLES, 6, WebGlRenderingContext.UNSIGNED_SHORT, 0);
}