Code does not work on MESA

[Min1123]

Fedora 20/21 the code cannot compile using cmake because it cannot find its own header files.

Meanwhile the standard instructions from the book to run cmake ../ from a new build directory:

[min@priara Hello_Triangle]$ pwd /home/min/Documents/code/opengles3-book/Chapter_2/Hello_Triangle [min@priara Hello_Triangle]$ mkdir build [min@priara Hello_Triangle]$ cd build [min@priara build]$ cmake .. -- The C compiler identification is GNU 4.9.1 -- The CXX compiler identification is GNU 4.9.1 -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Configuring done -- Generating done -- Build files have been written to: /home/min/Documents/code/opengles3-book/Chapter_2/Hello_Triangle/build [min@priara build]$ make Scanning dependencies of target Hello_Triangle [100%] Building C object CMakeFiles/Hello_Triangle.dir/Hello_Triangle.c.o /home/min/Documents/code/opengles3-book/Chapter_2/Hello_Triangle/Hello_Triangle.c:38:20: fatal error: esUtil.h: No such file or directory #include "esUtil.h" ^ compilation terminated. CMakeFiles/Hello_Triangle.dir/build.make:54: recipe for target 'CMakeFiles/Hello_Triangle.dir/Hello_Triangle.c.o' failed make[2]: *** [CMakeFiles/Hello_Triangle.dir/Hello_Triangle.c.o] Error 1 CMakeFiles/Makefile2:60: recipe for target 'CMakeFiles/Hello_Triangle.dir/all' failed make[1]: *** [CMakeFiles/Hello_Triangle.dir/all] Error 2 Makefile:76: recipe for target 'all' failed make: *** [all] Error 2 [min@priara build]$

When attempting to compile the code using gcc by itself, I have managed to resolve all the symbols, but when run the program starts and exits without opening a window, displaying anything, or giving text in the form of an error message.

gcc -o Hello_Triangle Hello_Triangle.c -I../../Common/Include -lEGL -lGLESv2 -lX11 ../../Common/Source/esUtil.c ../../Common/Source/LinuxX11/esUtil_X11.c

This does compile, but does not appear to run properly.

OpenGL ES profile version string: OpenGL ES 3.0 Mesa 10.3.0-rc1 OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.0 OpenGL ES profile extensions: GL_ANGLE_texture_compression_dxt3, GL_ANGLE_texture_compression_dxt5, GL_APPLE_texture_max_level, GL_EXT_blend_minmax, GL_EXT_color_buffer_float, GL_EXT_discard_framebuffer, GL_EXT_map_buffer_range, GL_EXT_multi_draw_arrays, GL_EXT_read_format_bgra, GL_EXT_separate_shader_objects, GL_EXT_shader_integer_mix, GL_EXT_texture_compression_dxt1, GL_EXT_texture_filter_anisotropic, GL_EXT_texture_format_BGRA8888, GL_EXT_texture_rg, GL_EXT_texture_type_2_10_10_10_REV, GL_EXT_unpack_subimage, GL_NV_draw_buffers, GL_NV_fbo_color_attachments, GL_NV_read_buffer, GL_OES_EGL_image, GL_OES_EGL_image_external, GL_OES_compressed_ETC1_RGB8_texture, GL_OES_depth24, GL_OES_depth_texture, GL_OES_depth_texture_cube_map, GL_OES_element_index_uint, GL_OES_fbo_render_mipmap, GL_OES_get_program_binary, GL_OES_mapbuffer, GL_OES_packed_depth_stencil, GL_OES_rgb8_rgba8, GL_OES_standard_derivatives, GL_OES_stencil8, GL_OES_surfaceless_context, GL_OES_texture_3D, GL_OES_texture_npot, GL_OES_vertex_array_object

uname -a Linux priara.sonnet 3.16.1-301.fc21.x86_64 #1 SMP Mon Aug 25 13:06:39 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

[syl-00101001]

building problem: i encountered the same problem on ubuntu 14.10 (which is unstable atm) if you try to build an example from an example folder you have "error: esUtil.h: No such file or directory" however, if you just build from root it builds OK: cd ../../ pwd [folder should be opengles3-book] cmake . make Chapter_2/Hello_Triangle/Hello_Triangle [should run the red triangle demo]

you have another problem with your graphics driver: eventually try to install proprietary drivers i also have problem with pvrshaman which does not detect opengl version correctly but as for the code examples from the book they work as expected here on two computers.

[Min1123]

Building problem: confirmed, running cmake . and then make builds properly

No proprietary drivers have been installed or attempted on the computer I'm running this on, Intel-only on the other one and FOSS Radeon on this one.

I added some debug lines to Hello_Triangle and got this flow.

It enters esMain, then Init, goes into LoadShader twice, then back in Init it closes after glCreateProgram() returns 0.

https://www.khronos.org/opengles/sdk/docs/man/xhtml/glCreateProgram.xml

That call is supposed to return a non-zero number, so I added another debug line inside the check. printf("error: %s\n", glGetError()); error: (null)

Please tell me I'm doing something wrong with that call to glGetError, or something else that might help me fix that.

BTW, commenting the check for 0 from glCreateProgram() does open a window and enter draw. Nothing is actually drawn to the window (expected because of the other failure), but it does close and behave as a window is expected under X11.