GL: Fixed crash when reading active attributes with ARB_program_interface_query.

src/renderer_gl.cpp

@@ -3779,6 +3779,8 @@ namespace bgfx { namespace gl
 		GL_CHECK(glBindFragDataLocation(m_id, 0, "bgfx_FragColor") );
 #endif // BGFX_CONFIG_RENDERER_OPENGL >= 31
 
+		GLint max0, max1;
+
 		bool piqSupported = true
 			&& s_extension[Extension::ARB_program_interface_query     ].m_supported
 			&& s_extension[Extension::ARB_shader_storage_buffer_object].m_supported
@@ -3789,16 +3791,18 @@ namespace bgfx { namespace gl
 			GL_CHECK(glGetProgramInterfaceiv(m_id, GL_PROGRAM_INPUT,   GL_ACTIVE_RESOURCES, &activeAttribs ) );
 			GL_CHECK(glGetProgramInterfaceiv(m_id, GL_UNIFORM,         GL_ACTIVE_RESOURCES, &activeUniforms) );
 			GL_CHECK(glGetProgramInterfaceiv(m_id, GL_BUFFER_VARIABLE, GL_ACTIVE_RESOURCES, &activeBuffers ) );
+			GL_CHECK(glGetProgramInterfaceiv(m_id, GL_PROGRAM_INPUT,	GL_MAX_NAME_LENGTH, &max0		   ) );
+			GL_CHECK(glGetProgramInterfaceiv(m_id, GL_UNIFORM,			GL_MAX_NAME_LENGTH, &max1		   ) );
 		}
 		else
 		{
 			GL_CHECK(glGetProgramiv(m_id, GL_ACTIVE_ATTRIBUTES, &activeAttribs ) );
 			GL_CHECK(glGetProgramiv(m_id, GL_ACTIVE_UNIFORMS,   &activeUniforms) );
+
+			GL_CHECK(glGetProgramiv(m_id, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &max0) );
+			GL_CHECK(glGetProgramiv(m_id, GL_ACTIVE_UNIFORM_MAX_LENGTH,   &max1) );
 		}
 
-		GLint max0, max1;
-		GL_CHECK(glGetProgramiv(m_id, GL_ACTIVE_ATTRIBUTE_MAX_LENGTH, &max0) );
-		GL_CHECK(glGetProgramiv(m_id, GL_ACTIVE_UNIFORM_MAX_LENGTH,   &max1) );
 		uint32_t maxLength = bx::uint32_max(max0, max1);
 		char* name = (char*)alloca(maxLength + 1);
 
@@ -3807,9 +3811,18 @@ namespace bgfx { namespace gl
 		for (int32_t ii = 0; ii < activeAttribs; ++ii)
 		{
 			GLint size;
-			GLenum type;
+			GLenum type = 0;
 
-			GL_CHECK(glGetActiveAttrib(m_id, ii, maxLength + 1, NULL, &size, &type, name) );
+			if (piqSupported)
+			{
+				GL_CHECK(glGetProgramResourceName(m_id, GL_PROGRAM_INPUT, ii, maxLength + 1, &size, name) );
+				GLenum typeProp[] = { GL_TYPE };
+				GL_CHECK(glGetProgramResourceiv(m_id, GL_PROGRAM_INPUT, ii, BX_COUNTOF(typeProp), typeProp, 1, NULL, (GLint *)&type) );
+			}
+			else
+			{
+				GL_CHECK(glGetActiveAttrib(m_id, ii, maxLength + 1, NULL, &size, &type, name) );
+			}
 
 			BX_TRACE("\t%s %s is at location %d"
 				, glslTypeName(type)