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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,5 @@ | ||
| ogl/context.cpp | ||
| ogl/shader.cpp | ||
| ogl/sprite.cpp | ||
| ogl/texture.cpp | ||
| ogl/utils.cpp | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /* | ||
| Copyright (C) 2018 by Jyrki Vesterinen <sandgtx@gmail.com> | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 2 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY. | ||
| See the COPYING file for more details. | ||
| */ | ||
|
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| #include "ogl/shader.hpp" | ||
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| #include "log.hpp" | ||
| #include "ogl/vertex.hpp" | ||
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| #include <array> | ||
| #include <cstddef> | ||
| #include <iostream> | ||
| #include <stdexcept> | ||
| #include <tuple> | ||
| #include <utility> | ||
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| static lg::log_domain log_opengl("opengl"); | ||
| #define LOG_GL LOG_STREAM(info, log_opengl) | ||
| #define ERR_GL LOG_STREAM(err, log_opengl) | ||
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| namespace | ||
| { | ||
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| std::pair<bool, std::string> compile_subshader(GLuint shader, const std::string& source_code) | ||
| { | ||
| GLint compile_status; | ||
| std::array<char, 1024> compile_log; | ||
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| int src_length = source_code.length(); | ||
| const char* src_char_array = source_code.data(); | ||
| glShaderSource(shader, 1, &src_char_array, &src_length); | ||
| glCompileShader(shader); | ||
| glGetShaderiv(shader, GL_COMPILE_STATUS, &compile_status); | ||
| glGetShaderInfoLog(shader, compile_log.size(), nullptr, compile_log.data()); | ||
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| return {compile_status == GL_TRUE, {compile_log.data()}}; | ||
| } | ||
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| } | ||
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| namespace gl | ||
| { | ||
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| shader::~shader() | ||
| { | ||
| std::array<GLuint, 2> subshaders; | ||
| glGetAttachedShaders(shader_program_, subshaders.size(), nullptr, subshaders.data()); | ||
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| glDeleteProgram(shader_program_); | ||
| for(const GLuint s : subshaders) { | ||
| glDeleteShader(s); | ||
| } | ||
| } | ||
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| void shader::activate() const | ||
| { | ||
| glUseProgram(shader_program_); | ||
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| GLint position_index = glGetAttribLocation(shader_program_, "position"); | ||
| GLint texcoord_index = glGetAttribLocation(shader_program_, "tex_coord"); | ||
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| glVertexAttribPointer(position_index, 2, GL_FLOAT, false, sizeof(vertex), | ||
| reinterpret_cast<const void*>(offsetof(vertex, x))); | ||
| glVertexAttribPointer(texcoord_index, 2, GL_FLOAT, false, sizeof(vertex), | ||
| reinterpret_cast<const void*>(offsetof(vertex, u))); | ||
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| glEnableVertexAttribArray(position_index); | ||
| glEnableVertexAttribArray(texcoord_index); | ||
| } | ||
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| void shader::compile(const std::string& vertex_shader_src, const std::string& pixel_shader_src) | ||
| { | ||
| bool success; | ||
| std::string compile_log; | ||
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| GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER); | ||
| std::tie(success, compile_log) = compile_subshader(vertex_shader, vertex_shader_src); | ||
| if(!success) { | ||
| ERR_GL << "Error compiling vertex shader\n" << compile_log << std::endl; | ||
| throw std::invalid_argument("error compiling vertex shader"); | ||
| } else if(compile_log != "") { | ||
| LOG_GL << compile_log << std::endl; | ||
| } | ||
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| GLuint pixel_shader = glCreateShader(GL_FRAGMENT_SHADER); | ||
| std::tie(success, compile_log) = compile_subshader(pixel_shader, pixel_shader_src); | ||
| if(!success) { | ||
| ERR_GL << "Error compiling pixel shader\n" << compile_log << std::endl; | ||
| throw std::invalid_argument("error compiling pixel shader"); | ||
| } else if(compile_log != "") { | ||
| LOG_GL << compile_log << std::endl; | ||
| } | ||
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| shader_program_ = glCreateProgram(); | ||
| glAttachShader(shader_program_, vertex_shader); | ||
| glAttachShader(shader_program_, pixel_shader); | ||
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| glLinkProgram(shader_program_); | ||
| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| /* | ||
| Copyright (C) 2018 by Jyrki Vesterinen <sandgtx@gmail.com> | ||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 2 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY. | ||
| See the COPYING file for more details. | ||
| */ | ||
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| #pragma once | ||
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| #include <GL/glew.h> | ||
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| #include <string> | ||
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| namespace gl | ||
| { | ||
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| class shader | ||
| { | ||
| public: | ||
| /** Constructor. | ||
| @param vertex_shader_src Vertex shader source code. | ||
| @param pixel_shader_src Pixel shader source code. | ||
| @throw std::invalid_argument if compiling the shader fails. | ||
| */ | ||
| shader(const std::string& vertex_shader_src, const std::string& pixel_shader_src) | ||
| { | ||
| compile(pixel_shader_src, vertex_shader_src); | ||
| } | ||
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| /// Destructor. | ||
| ~shader(); | ||
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| /// Makes the shader the active shader. | ||
| /// The right VBO and VAO must be already bound. | ||
| void activate() const; | ||
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| private: | ||
| void compile(const std::string& vertex_shader_src, const std::string& pixel_shader_src); | ||
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| GLuint shader_program_ = 0u; | ||
| }; | ||
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| } |