💿🐜 Antkeeper source code
https://antkeeper.com
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339 lines
9.4 KiB
339 lines
9.4 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "gl/shader-program.hpp"
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#include "gl/shader-object.hpp"
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#include "gl/shader-variable-type.hpp"
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#include "gl/shader-input.hpp"
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#include <glad/glad.h>
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#include <stdexcept>
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namespace gl {
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shader_program::shader_program():
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gl_program_id(0),
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linked(false)
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{
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// Create an OpenGL shader program
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gl_program_id = glCreateProgram();
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// Handle OpenGL errors
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if (!gl_program_id)
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{
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throw std::runtime_error("An error occurred while creating an OpenGL shader program.");
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}
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}
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shader_program::~shader_program()
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{
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// Delete shader inputs
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free_inputs();
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// Detach all shader objects
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detach_all();
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// Delete the OpenGL shader program
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glDeleteProgram(gl_program_id);
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}
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void shader_program::attach(const shader_object* object)
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{
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if (attached_objects.find(object) != attached_objects.end())
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{
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throw std::runtime_error("Shader object is already attached to the shader program.");
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}
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else
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{
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// Check that both the OpenGL shader program and OpenGL shader object are valid
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if (glIsProgram(gl_program_id) != GL_TRUE)
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throw std::runtime_error("OpenGL shader program is not a valid program object.");
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if (glIsShader(object->gl_shader_id) != GL_TRUE)
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throw std::runtime_error("OpenGL shader object is not a valid shader object.");
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// Attach the OpenGL shader object to the OpenGL shader program
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glAttachShader(gl_program_id, object->gl_shader_id);
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// Handle OpenGL errors
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switch (glGetError())
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{
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case GL_INVALID_OPERATION:
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throw std::runtime_error("OpenGL shader object is already attached to the shader program.");
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break;
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}
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// Add shader object to set of attached objects
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attached_objects.insert(object);
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}
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}
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void shader_program::detach(const shader_object* object)
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{
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if (attached_objects.find(object) == attached_objects.end())
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{
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throw std::runtime_error("Shader object is not attached to the shader program.");
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}
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else
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{
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// Check that both the OpenGL shader program and OpenGL shader object are valid
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if (glIsProgram(gl_program_id) != GL_TRUE)
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throw std::runtime_error("OpenGL shader program is not a valid program object.");
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if (glIsShader(object->gl_shader_id) != GL_TRUE)
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throw std::runtime_error("OpenGL shader object is not a valid shader object.");
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// Detach the OpenGL shader object from the OpenGL shader program
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glDetachShader(gl_program_id, object->gl_shader_id);
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// Handle OpenGL errors
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switch (glGetError())
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{
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case GL_INVALID_OPERATION:
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throw std::runtime_error("OpenGL shader object is not attached to the shader program.");
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break;
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}
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// Remove shader object from set of attached objects
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attached_objects.erase(object);
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}
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}
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void shader_program::detach_all()
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{
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while (!attached_objects.empty())
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detach(*attached_objects.begin());
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}
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bool shader_program::link()
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{
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// Check that the OpenGL shader program is valid
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if (glIsProgram(gl_program_id) != GL_TRUE)
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throw std::runtime_error("OpenGL shader program is not a valid program object.");
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// Link OpenGL shader program
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glLinkProgram(gl_program_id);
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// Handle OpenGL errors
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switch (glGetError())
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{
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case GL_INVALID_OPERATION:
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throw std::runtime_error("OpenGL shader program is the currently active program object and transform feedback mode is active.");
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break;
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}
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// Get OpenGL shader program linking status
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GLint gl_link_status;
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glGetProgramiv(gl_program_id, GL_LINK_STATUS, &gl_link_status);
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linked = (gl_link_status == GL_TRUE);
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// Get OpenGL shader program info log length
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GLint gl_info_log_length;
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glGetProgramiv(gl_program_id, GL_INFO_LOG_LENGTH, &gl_info_log_length);
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if (gl_info_log_length > 0)
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{
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// Resize string to accommodate OpenGL shader program info log
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info_log.resize(gl_info_log_length);
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// Read OpenGL shader program info log into string
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glGetProgramInfoLog(gl_program_id, gl_info_log_length, &gl_info_log_length, info_log.data());
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// Remove redundant null terminator from string
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info_log.pop_back();
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}
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else
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{
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// Empty info log
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info_log.clear();
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}
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// Find shader inputs
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find_inputs();
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return linked;
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}
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void shader_program::find_inputs()
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{
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// Get maximum uniform name length
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GLint max_uniform_name_length = 0;
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glGetProgramiv(gl_program_id, GL_ACTIVE_UNIFORM_MAX_LENGTH, &max_uniform_name_length);
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// Allocate uniform name buffer
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GLchar* uniform_name = new GLchar[max_uniform_name_length];
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// Get number of active uniforms in the shader
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GLint active_uniform_count = 0;
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glGetProgramiv(gl_program_id, GL_ACTIVE_UNIFORMS, &active_uniform_count);
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// Set first available texture unit
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int available_texture_unit = 0;
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// For each active uniform
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for (GLuint uniform_index = 0; uniform_index < static_cast<GLuint>(active_uniform_count); ++uniform_index)
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{
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// Get information about uniform
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GLsizei uniform_name_length;
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GLint uniform_size;
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GLenum uniform_type;
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glGetActiveUniform(gl_program_id, uniform_index, static_cast<GLsizei>(max_uniform_name_length), &uniform_name_length, &uniform_size, &uniform_type, &uniform_name[0]);
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// Get name without array symbols
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std::string input_name = uniform_name;
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std::size_t bracketPos = input_name.find_first_of("[");
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if (bracketPos != std::string::npos)
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{
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input_name = input_name.substr(0, bracketPos);
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}
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// Determine corresponding shader variable data type
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shader_variable_type variable_type;
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int texture_unit = -1;
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bool unsupported = false;
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switch (uniform_type)
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{
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case GL_BOOL:
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variable_type = shader_variable_type::bool1;
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break;
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case GL_BOOL_VEC2:
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variable_type = shader_variable_type::bool2;
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break;
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case GL_BOOL_VEC3:
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variable_type = shader_variable_type::bool3;
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break;
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case GL_BOOL_VEC4:
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variable_type = shader_variable_type::bool4;
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break;
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case GL_INT:
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variable_type = shader_variable_type::int1;
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break;
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case GL_INT_VEC2:
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variable_type = shader_variable_type::int2;
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break;
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case GL_INT_VEC3:
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variable_type = shader_variable_type::int3;
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break;
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case GL_INT_VEC4:
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variable_type = shader_variable_type::int4;
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break;
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case GL_UNSIGNED_INT:
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variable_type = shader_variable_type::uint1;
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break;
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case GL_UNSIGNED_INT_VEC2:
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variable_type = shader_variable_type::uint2;
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break;
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case GL_UNSIGNED_INT_VEC3:
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variable_type = shader_variable_type::uint3;
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break;
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case GL_UNSIGNED_INT_VEC4:
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variable_type = shader_variable_type::uint4;
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break;
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case GL_FLOAT:
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variable_type = shader_variable_type::float1;
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break;
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case GL_FLOAT_VEC2:
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variable_type = shader_variable_type::float2;
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break;
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case GL_FLOAT_VEC3:
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variable_type = shader_variable_type::float3;
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break;
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case GL_FLOAT_VEC4:
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variable_type = shader_variable_type::float4;
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break;
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case GL_FLOAT_MAT2:
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variable_type = shader_variable_type::float2x2;
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break;
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case GL_FLOAT_MAT3:
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variable_type = shader_variable_type::float3x3;
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break;
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case GL_FLOAT_MAT4:
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variable_type = shader_variable_type::float4x4;
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break;
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case GL_SAMPLER_1D:
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case GL_SAMPLER_1D_SHADOW:
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variable_type = shader_variable_type::texture_1d;
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texture_unit = available_texture_unit;
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available_texture_unit += uniform_size;
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break;
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case GL_SAMPLER_2D:
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case GL_SAMPLER_2D_SHADOW:
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variable_type = shader_variable_type::texture_2d;
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texture_unit = available_texture_unit;
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available_texture_unit += uniform_size;
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break;
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case GL_SAMPLER_3D:
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variable_type = shader_variable_type::texture_3d;
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texture_unit = available_texture_unit;
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available_texture_unit += uniform_size;
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break;
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case GL_SAMPLER_CUBE:
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variable_type = shader_variable_type::texture_cube;
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texture_unit = available_texture_unit;
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available_texture_unit += uniform_size;
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break;
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default:
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unsupported = true;
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break;
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}
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// Check if data type is supported
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if (unsupported)
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{
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std::string message = std::string("Shader uniform \"") + std::string(uniform_name) + std::string("\" has unsupported data type.");
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throw std::runtime_error(message.c_str());
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}
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// Get uniform location
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GLint uniform_location = glGetUniformLocation(gl_program_id, uniform_name);
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if (uniform_location == -1)
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{
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//std::string message = std::string("Unable to get location for uniform \"") + std::string(uniform_name) + std::string("\"");
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//throw std::runtime_error(message.c_str());
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}
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else
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{
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// Create new shader input
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shader_input* input = new shader_input(this, inputs.size(), uniform_location, input_name, variable_type, uniform_size, texture_unit);
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input_map[input_name] = input;
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inputs.push_back(input);
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}
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}
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// Free uniform name buffer
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delete[] uniform_name;
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}
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void shader_program::free_inputs()
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{
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for (shader_input* input: inputs)
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{
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delete input;
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}
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inputs.clear();
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}
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} // namespace gl
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