mirror of
https://github.com/OpenRCT2/OpenRCT2
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142 lines
4.3 KiB
C++
142 lines
4.3 KiB
C++
#pragma region Copyright (c) 2014-2016 OpenRCT2 Developers
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/*****************************************************************************
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* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
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*
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* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
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* For more information, visit https://github.com/OpenRCT2/OpenRCT2
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*
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* OpenRCT2 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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* A full copy of the GNU General Public License can be found in licence.txt
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*****************************************************************************/
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#pragma endregion
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#ifndef DISABLE_OPENGL
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#define NO_EXTERN_GLAPI
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#include "OpenGLAPI.h"
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#if OPENGL_NO_LINK
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#include <SDL_video.h>
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#include "../../../core/Console.hpp"
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template <typename T>
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static inline bool SetProc(T * func, const char * name)
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{
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T address = (T)SDL_GL_GetProcAddress(name);
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if (address == nullptr)
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{
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return false;
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}
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*func = address;
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return true;
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}
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#define SetupOpenGLFunction(func) \
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{ \
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if (!SetProc(&func, "" #func "")) \
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{ \
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return "" #func ""; \
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} \
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}
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static const char * TryLoadAllProcAddresses()
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{
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// 1.1 functions
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SetupOpenGLFunction(glActiveTexture);
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SetupOpenGLFunction(glBegin);
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SetupOpenGLFunction(glBindTexture);
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SetupOpenGLFunction(glBlendFunc);
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SetupOpenGLFunction(glClear);
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SetupOpenGLFunction(glClearColor);
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SetupOpenGLFunction(glCullFace);
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SetupOpenGLFunction(glDeleteTextures);
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SetupOpenGLFunction(glDisable);
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SetupOpenGLFunction(glDrawArrays);
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SetupOpenGLFunction(glEnable);
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SetupOpenGLFunction(glEnd);
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SetupOpenGLFunction(glGenTextures);
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SetupOpenGLFunction(glGetError);
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SetupOpenGLFunction(glReadPixels);
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SetupOpenGLFunction(glTexImage2D);
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SetupOpenGLFunction(glTexParameteri);
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SetupOpenGLFunction(glViewport);
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// 2.0+ functions
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SetupOpenGLFunction(glAttachShader);
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SetupOpenGLFunction(glBindBuffer);
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SetupOpenGLFunction(glBindFragDataLocation);
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SetupOpenGLFunction(glBindFramebuffer);
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SetupOpenGLFunction(glBindVertexArray);
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SetupOpenGLFunction(glBufferData);
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SetupOpenGLFunction(glCompileShader);
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SetupOpenGLFunction(glCreateProgram);
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SetupOpenGLFunction(glCreateShader);
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SetupOpenGLFunction(glDeleteBuffers);
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SetupOpenGLFunction(glDeleteFramebuffers);
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SetupOpenGLFunction(glDeleteProgram);
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SetupOpenGLFunction(glDeleteShader);
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SetupOpenGLFunction(glDeleteVertexArrays);
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SetupOpenGLFunction(glDetachShader);
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SetupOpenGLFunction(glEnableVertexAttribArray);
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SetupOpenGLFunction(glFramebufferTexture2D);
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SetupOpenGLFunction(glGetAttribLocation);
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SetupOpenGLFunction(glGenBuffers);
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SetupOpenGLFunction(glGenFramebuffers);
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SetupOpenGLFunction(glGetProgramInfoLog);
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SetupOpenGLFunction(glGetProgramiv);
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SetupOpenGLFunction(glGetShaderInfoLog);
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SetupOpenGLFunction(glGetShaderiv);
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SetupOpenGLFunction(glGetUniformLocation);
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SetupOpenGLFunction(glGenVertexArrays);
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SetupOpenGLFunction(glLinkProgram);
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SetupOpenGLFunction(glShaderSource);
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SetupOpenGLFunction(glUniform1i);
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SetupOpenGLFunction(glUniform2i);
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SetupOpenGLFunction(glUniform4f);
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SetupOpenGLFunction(glUniform4i);
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SetupOpenGLFunction(glUseProgram);
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SetupOpenGLFunction(glVertexAttribIPointer);
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SetupOpenGLFunction(glVertexAttribPointer);
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return nullptr;
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}
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#endif /* #if OPENGL_NO_LINK */
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namespace OpenGLState
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{
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uint16 ActiveTexture = UINT16_MAX;
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GLuint CurrentProgram = UINT32_MAX;
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}
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void OpenGLAPI::SetTexture2D(uint16 index, GLuint texture)
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{
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if (OpenGLState::ActiveTexture != index)
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{
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glActiveTexture(GL_TEXTURE0 + index);
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}
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glBindTexture(GL_TEXTURE_2D, texture);
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}
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bool OpenGLAPI::Initialise()
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{
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#ifdef OPENGL_NO_LINK
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const char * failedProcName = TryLoadAllProcAddresses();
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if (failedProcName != nullptr)
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{
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Console::Error::WriteFormat("Failed to load %s.\n", failedProcName);
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return false;
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}
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#endif
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return true;
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}
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#endif /* DISABLE_OPENGL */
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