GLSL app broken

[alexreinking]

The GLSL app is broken (and isn't built by the Makefile currently). When trying to build and test it on cmake-modern, we get the following error:

543: 1: Entering Pipeline halide_blur_glsl
543: 1: Target: x86-64-linux-avx-avx2-cuda-debug-no_runtime-opengl-sse41
543: 1:  Input Buffer input8: buffer(0, 0x0, 0x55d69f0db900, 0, uint8, {0, 12, 1}, {0, 32, 12}, {0, 3, 384})
543: 1:  Output Buffer blur_filter: buffer(0, 0x0, 0x55d69f0dbe00, 0, uint8, {0, 12, 1}, {0, 32, 12}, {0, 3, 384})
543: 1: In initialize_kernels
543: 1: Halide running on OpenGL 3.2
543: 1:   vertex_array_objects: yes
543: 1:   texture_rg: yes
543: 1:   have_texture_rgb8_rgba8: yes
543: 1:   texture_float: yes
543: 1: Compiling GLSL kernel (size = 375):
543: 1: GL_VERTEX_SHADER SOURCE:
543: 1: attribute vec4 _varyingf0_attrib;
543: 1: varying   vec4 _varyingf0;
543: 1: uniform ivec2 output_min;
543: 1: uniform ivec2 output_extent;
543: 1: void main() {
543: 1:     vec2 position = vec2(_varyingf0_attrib[0], _varyingf0_attrib[1]);
543: 1:     gl_Position = vec4(position, 0.0, 1.0);
543: 1:     vec2 texcoord = 0.5 * position + 0.5;
543: 1:     vec2 pixcoord = texcoord * vec2(output_extent.xy) + vec2(output_min.xy);
543: 1:     _varyingf0 = _varyingf0_attrib;
543: 1:     _varyingf0.xy = pixcoord;
543: 1: }
543: 1: GL_FRAGMENT_SHADER SOURCE:
543: 1: 
543: 1: // ll suffix in OpenCL is reserved for 128-bit integers.
543: 1: #if defined __OPENCL_VERSION__
543: 1: #define ADD_INT64_T_SUFFIX(x) x##l
543: 1: #define ADD_UINT64_T_SUFFIX(x) x##ul
543: 1: // HLSL doesn't have any suffixes.
543: 1: #elif defined HLSL_VERSION
543: 1: #define ADD_INT64_T_SUFFIX(x) x
543: 1: #define ADD_UINT64_T_SUFFIX(x) x
543: 1: #else
543: 1: #define ADD_INT64_T_SUFFIX(x) x##ll
543: 1: #define ADD_UINT64_T_SUFFIX(x) x##ull
543: 1: #endif
543: 1: Compiling GLSL kernel (size = 4241):
543: 1: Error: Internal error: argument type not supported