C# WebGLRenderingContext.getProgramParameter方法代码示例

        static CreateShaderResult CreateShader(
            WebGLRenderingContext gl,
            string tvs,
            string tfs,
            bool nativeDebug
            )
        {
            //new IHTMLPre { "enter CreateShader" }.AttachToDocument();

            //var p = gl.createProgram();

            var vs = new WebGLShader(gl, gl.VERTEX_SHADER);
            var fs = new WebGLShader(gl, gl.FRAGMENT_SHADER);

            gl.shaderSource(vs, tvs);
            gl.shaderSource(fs, tfs);

            gl.compileShader(vs);

            var ok = new CreateShaderResult { mSuccess = true };

            // https://www.khronos.org/registry/webgl/extensions/WEBGL_debug_shaders/
            new WebGLDebugShaders(gl).With(x => ok.vsTranslatedShaderSource = x.getTranslatedShaderSource(vs));

            //gl.getExtension("WEBGL_debug_shaders").With(
            //(dynamic WEBGL_debug_shaders) =>
            //	{
            //		ok.vsTranslatedShaderSource = WEBGL_debug_shaders.getTranslatedShaderSource((WebGLShader)vs);
            //	}
            //);

            gl.compileShader(fs);

            // ipad wont have it available
            new WebGLDebugShaders(gl).With(x => ok.fsTranslatedShaderSource = x.getTranslatedShaderSource(fs));

            //gl.getExtension("WEBGL_debug_shaders").With(
            //	(dynamic WEBGL_debug_shaders) =>
            //	{
            //		ok.fsTranslatedShaderSource = WEBGL_debug_shaders.getTranslatedShaderSource((WebGLShader)fs);
            //	}
            //);

            if (gl.getShaderParameter(vs, gl.COMPILE_STATUS) == null)
            {
                var infoLog = gl.getShaderInfoLog(vs);

                // does our async rewriter throw async exceptions yet?
                throw new Exception(message: new { infoLog }.ToString());
                //new IHTMLPre { "error CreateShader " + new { infoLog } }.AttachToDocument();
                //return new CreateShaderResult { mSuccess = false, mInfo = infoLog };
            }

            var fsCOMPILE_STATUS = (bool)gl.getShaderParameter(fs, gl.COMPILE_STATUS);
            //new IHTMLPre { "CreateShader " + new { fsCOMPILE_STATUS } }.AttachToDocument();

            if (!fsCOMPILE_STATUS)
            {
                var infoLog = gl.getShaderInfoLog(fs);
                throw new Exception(message: new { infoLog }.ToString());
                //new IHTMLPre { "error CreateShader " + new { infoLog } }.AttachToDocument();
                //return new CreateShaderResult { mSuccess = false, mInfo = infoLog };
            }


            var p = new WebGLProgram(gl);
            gl.attachShader(p, vs);
            gl.attachShader(p, fs);

            // using dispose?
            gl.deleteShader(vs);
            gl.deleteShader(fs);

            gl.linkProgram(p);

            var linkResult = (bool)gl.getProgramParameter(p, gl.LINK_STATUS);

            //new IHTMLPre { "CreateShader " + new { linkResult } }.AttachToDocument();

            if (!linkResult)
            {
                var infoLog = gl.getProgramInfoLog(p);
                gl.deleteProgram(p);
                throw new Exception(message: new { infoLog }.ToString());
                //new IHTMLPre { "error CreateShader " + new { infoLog } }.AttachToDocument();
                //return new CreateShaderResult { mSuccess = false, mInfo = infoLog };
            }

            // https://msdn.microsoft.com/en-us/library/ie/dn302415(v=vs.85).aspx
            //new IHTMLPre { "exit CreateShader" }.AttachToDocument();

            ok.mProgram = p;
            return ok;
        }

        private void Initialize(IHTMLCanvas c, WebGLRenderingContext gl, IDefault  page)
        {
            // http://cs.helsinki.fi/u/ilmarihe/metatunnel.html
            // http://wakaba.c3.cx/w/puls.html

            Action<string> alert = Native.window.alert;

            c.style.border = "1px solid yellow";

            page.MaxTextures.innerText = "" + gl.getParameter(gl.MAX_COMBINED_TEXTURE_IMAGE_UNITS);

            // https://www.khronos.org/webgl/public-mailing-list/archives/1007/msg00034.html

            var vs = "";

            vs += "precision highp float; \n";
            vs += "attribute vec3 aVertexPosition;";
            vs += "attribute vec2 aTextureCoord;";
            vs += "uniform mat4 uModelViewMatrix;";
            vs += "uniform mat4 uProjectionMatrix;";
            vs += "varying vec2 vTextureCoord;";
            vs += "void main(void) {";
            vs += "gl_Position = uProjectionMatrix * uModelViewMatrix * vec4(aVertexPosition, 1.0);";
            vs += "vTextureCoord = vec2(aTextureCoord.x, 1.0 - aTextureCoord.y);";
            vs += "}";

           var fs = "";
            
            fs += "precision highp float; \n";
            fs += "varying vec2 vTextureCoord;";
            fs += "uniform sampler2D uSamplerDiffuse1;";
            fs += "uniform sampler2D uSamplerDiffuse2;";
            fs += "uniform sampler2D uSamplerDiffuse3;";
            fs += "uniform sampler2D uSamplerDiffuse4;";
            fs += "uniform sampler2D uSamplerDiffuse5;";
            fs += "uniform sampler2D uSamplerDiffuse6;";
            fs += "void main(void) {";
            fs += "gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0) * texture2D(uSamplerDiffuse1, vTextureCoord)";
            fs += "+ vec4(0.0, 1.0, 0.0, 1.0) * texture2D(uSamplerDiffuse2, vTextureCoord)";
            fs += "+ vec4(0.0, 0.0, 1.0, 1.0) * texture2D(uSamplerDiffuse3, vTextureCoord)";
            fs += "+ vec4(0.0, 1.0, 1.0, 1.0) * texture2D(uSamplerDiffuse4, vTextureCoord)";
            fs += "+ vec4(1.0, 0.0, 1.0, 1.0) * texture2D(uSamplerDiffuse5, vTextureCoord)";
            fs += "+ vec4(1.0, 1.0, 0.0, 1.0) * texture2D(uSamplerDiffuse6, vTextureCoord);";
            fs += "}";


            var xfs = gl.createShader(gl.FRAGMENT_SHADER);
            gl.shaderSource(xfs, fs);
            gl.compileShader(xfs);
            if ((int)gl.getShaderParameter(xfs, gl.COMPILE_STATUS) != 1)
            {
                // vs: ERROR: 0:2: '' : Version number not supported by ESSL 
                // fs: ERROR: 0:1: '' : No precision specified for (float) 

                var error = gl.getShaderInfoLog(xfs);
                Native.window.alert("fs: " + error);
                return;
            }

            var xvs = gl.createShader(gl.VERTEX_SHADER);
            gl.shaderSource(xvs, vs);
            gl.compileShader(xvs);
            if ((int)gl.getShaderParameter(xvs, gl.COMPILE_STATUS) != 1)
            {
                // vs: ERROR: 0:2: '' : Version number not supported by ESSL 
                // vs: ERROR: 0:10: '-' :  wrong operand types  no operation '-' exists that takes a left-hand operand of type 'const mediump int' and a right operand of type 'float' (or there is no acceptable conversion)


                var error = gl.getShaderInfoLog(xvs);
                Native.window.alert("vs: " + error);
                return;
            }

            var shader = new foo();

            shader.program = gl.createProgram();
            gl.attachShader(shader.program, xvs);
            gl.attachShader(shader.program, xfs);
            gl.linkProgram(shader.program);

            var linked = gl.getProgramParameter(shader.program, gl.LINK_STATUS);
            if (linked == null)
            {
                var error = gl.getProgramInfoLog(shader.program);
                Native.window.alert("Error while linking: " + error);
                return;
            }

            gl.useProgram(shader.program);
            shader.aVertexPosition = gl.getAttribLocation(shader.program, "aVertexPosition");
            shader.aTextureCoord = gl.getAttribLocation(shader.program, "aTextureCoord");
            gl.enableVertexAttribArray((uint)shader.aVertexPosition);
            gl.enableVertexAttribArray((uint)shader.aTextureCoord);

            shader.u["uModelViewMatrix"] = gl.getUniformLocation(shader.program, "uModelViewMatrix");
            shader.u["uProjectionMatrix"] = gl.getUniformLocation(shader.program, "uProjectionMatrix");

            shader.u["uSamplerDiffuse1"] = gl.getUniformLocation(shader.program, "uSamplerDiffuse1");
            shader.u["uSamplerDiffuse2"] = gl.getUniformLocation(shader.program, "uSamplerDiffuse2");
            shader.u["uSamplerDiffuse3"] = gl.getUniformLocation(shader.program, "uSamplerDiffuse3");
//.........这里部分代码省略.........