How can I local gles error: [gles_state_set_error_internal:62: GLES ctx: 0xe097c008, error code:0x500]

From the error only, it seems that your OpenGL implementation is returning GL_INVALID_ENUM from some operation. However, without providing any source code, it's difficult to understand what you're trying to do and what is failing.

A wild guess though : Are you trying to call  glGetTexImage with an invalid value ?

From the error only, it seems that your OpenGL implementation is returning GL_INVALID_ENUM from some operation. However, without providing any source code, it's difficult to understand what you're trying to do and what is failing.

A wild guess though : Are you trying to call  glGetTexImage with an invalid value ?

Thanks for your reply, I've debugged this problem with the MGD, and the error is returned from the call:

glBindTexture(GL_TEXTURE, 0);

--

And I got thousands of errors per frame.

In the project there is only one place references to the glBindTexture(GL_TEXTURE, 0) :

The opengl doc says :The value zero is reserved to represent the default texture for each texture target.

So I'm not sure what the problem is , and why this line would return an error continuously.

Thanks!

Obviously this is an error made so uncarefully by my collegues. And it costed me so much efforts to figure it out since I'm not familiar with the API.

Thanks again, myy and everybody else.

In OpenGL ES 2.0, the only values accepted as the first argument of glBindTexture are :

• GL_TEXTURE_2D
• GL_TEXTURE_CUBE_MAP

Any other value will generate an GL_INVALID_ENUM (0x500) error.

One way to load a texture is to :

• Create a GLuint variable where you will store a texture reference
• Load the texture data in a buffer
• Call glGenTextures(1, &your_gluint_texture_reference)
• Call glActiveTexture(GL_TEXTURE0) /* Or, as the manual says GL_TEXTUREi where i ranges from 0 to (GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS - 1) */
• Call glBindTexture(GL_TEXTURE_2D, your_gluint_texture_reference)
• Call glTexImage2D(GL_TEXTURE_2D, 0, color_format, width, height, 0, color_format, color_representation, &your_buffer_with_the_texture_data)
  Where color_format is either : GL_RGB, GL_RGBA;
  and color_representation is either : GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_4_4_4_4, or GL_UNSIGNED_SHORT_5_5_5_1
• (Optional) Generate mimaps, set the desired behaviour when texture coordinates are outside [0,1] and set the color interpolation behaviour when the textures do not fit the area by calling :
  glGeneratePixmap(GL_TEXTURE_2D);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); /* Horizontal repetition behaviour */
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); /* Vertical repetition behaviour. You can use GL_CLAMP_TO_EDGE to have a stretch effect */
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); /* Color interpolation behaviour when the texture is bigger than the area. */
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); /* Color interpolation behaviour when the texture is smaller than the area */

Then, once a program linked :

• Define a sample2D uniform variable in your fragment shader that will determine the texture unit to use
• Define a GLuint that will represent this uniform value ID :
• Call your_texture_uniform_value_id = glGetUniformLocation(your_program_id, "your_uniform_variable_name");

When using the program, you can then bind the uniform variable of your fragment shader to the current texture unit used by calling :

glUniform1i(your_texture_uniform_value_id, 0); /* Or the number suffixed to GL_TEXTUREi in your previous glActiveTexture call */

Since I'm still learning the thing, there might be unnecessary steps in this explanation. However, this is how I currently load textures in my OpenGL ES 2.0 program.

Accurate informations on these different calls can be obtained from the official manual pages.

Minor edit : glUniform1i(your_texture_uniform_value_id, GL_TEXTUREi) was invalid. I thought that GL_TEXTURE0 would be defined as 0x0, but it is not and its use as a sampler ID in a fragment shader leads to undefined behaviour.