Question

我是opengl的新手，我正在尝试将纹理应用于3D图形，但我得到了glGetUniformLocation：glError 1282错误，请帮我解决这个问题，我在网上搜索但无法纠正它。将是如果有人解释这个问题也很高兴。

我的着色器：

private final String vertexShaderCode =
        "uniform mat4 uMVPMatrix;" +
                "attribute vec4 vPosition;" +
                "attribute vec2 texCoord;" +
                "varying vec2 texCoordOut;" +
                "void main() {" +
                "  gl_Position = uMVPMatrix * vPosition;" +
                "  texCoordOut = texCoord;" +
                "}";

private final String fragmentShaderCode =
        "precision mediump float;" +
                "uniform vec4 texColor"+
                "varying vec2 texCoordOut;" +
                "uniform sampler2D Texture;" +
                "void main() {" +
                " texColor = texture2D(Texture, texCoordOut);" +
                "  gl_FragColor = texColor;" +
                "}";

绘制方法：

public void draw1(float[] mvpMatrix) {
    // Add program to OpenGL environment
    GLES20.glUseProgram(mProgram);

    // get handle to vertex shader's vPosition member
    mPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");

    mMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
    MyGLRenderer.checkGlError("glGetUniformLocation");

    // Apply the projection and view transformation
    GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, mvpMatrix, 0);
    MyGLRenderer.checkGlError("glUniformMatrix4fv");

    vsTextureCoord = GLES20.glGetAttribLocation(mProgram, "texCoord");
    fsTexture = GLES20.glGetUniformLocation(mProgram, "Texture");
    // Enable a handle to the triangle vertices
    GLES20.glEnableVertexAttribArray(mPositionHandle);

    // Prepare the triangle coordinate data
    GLES20.glVertexAttribPointer(
            mPositionHandle, COORDS_PER_VERTEX,
            GLES20.GL_FLOAT, false,
            vertexStride, vertexBuffer);
    GLES20.glEnableVertexAttribArray(vsTextureCoord);

    GLES20.glVertexAttribPointer(vsTextureCoord, COORDS_PER_TEXTURE,
            GLES20.GL_FLOAT, false,
            TextureStride, texBuffer);

    // get handle to shape's transformation matrix
    GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[0]);
    GLES20.glUniform1i(fsTexture, 0);

    // Draw the triangle
    GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, tablelamp21NumVerts);

    // Disable vertex array
    GLES20.glDisableVertexAttribArray(mPositionHandle);
    GLES20.glDisableVertexAttribArray(vsTextureCoord);

}

LoadTexture：

public void loadGLTexture(Context context) {
    GLES20.glGenTextures(4, textures, 0);
    Bitmap bitmap = null;
    for (int i=0;i<4;i++)
    {
        // Create a bitmap
        bitmap = BitmapFactory.decodeResource(context.getResources(), resourceIds[i]);
        //...and bind it to our array
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[i]);
        //Create Nearest Filtered Texture
        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);

        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
        //Use the Android GLUtils to specify a two-dimensional texture image from our bitmap
        GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
        //Clean up
        bitmap = null;
    }
}

Answer 1

您甚至不应该首先编译着色器。

在片段着色器中，您已声明 Sampler2D为变量纹理，但您使用 u_texture 对其进行采样。在两个地方使用相同的变量名称，也应与

相同

private final String vertexShaderCode =
    "uniform mat4 uMVPMatrix;" +
            "attribute vec4 vPosition;" +
            "attribute vec2 texCoord;" +
            "varying vec2 texCoordOut;" +
            "void main() {" +
            "  gl_Position = uMVPMatrix * vPosition;" +
            "  texCoordOut = texCoord;" +
            "}";


private final String fragmentShaderCode =
    "precision mediump float;" +
            "uniform vec4 texcColor"+
            "varying vec2 texCoordOut;" +
            "uniform sampler2D u_texture;" +
            "void main() {" +
            " texColor = texture2D(u_texture, texCoordOut);" +
            "  gl_FragColor = texColor;" +
            "}";

在GLES代码中，

 fsTexture = GLES20.glGetUniformLocation(mProgram, "u_texture");

OpenGlES2.0纹理问题

1 个答案: