eacc143ea0
nearly all of the previous required extensions are CORE in OpenGL 2.0 the remaining ones need to have fallback checks for ARB vs EXT vs APPLE variants..
113 lines
2.7 KiB
C++
113 lines
2.7 KiB
C++
/*
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** glstate.cpp
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**
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** This file is part of mkxp.
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**
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** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
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**
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** mkxp 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 2 of the License, or
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** (at your option) any later version.
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**
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** mkxp 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 mkxp. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "glstate.h"
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#include "etc.h"
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#include <glew.h>
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#include <SDL_rect.h>
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void GLClearColor::apply(const Vec4 &value)
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{
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glClearColor(value.x, value.y, value.z, value.w);
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}
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void GLScissorBox::apply(const IntRect &value)
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{
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glScissor(value.x, value.y, value.w, value.h);
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}
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void GLScissorBox::setIntersect(const IntRect &value)
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{
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IntRect ¤t = get();
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SDL_Rect r1 = { current.x, current.y, current.w, current.h };
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SDL_Rect r2 = { value.x, value.y, value.w, value.h };
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SDL_Rect result;
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if (!SDL_IntersectRect(&r1, &r2, &result))
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result.w = result.h = 0;
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set(IntRect(result.x, result.y, result.w, result.h));
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}
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void GLScissorTest::apply(const bool &value)
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{
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value ? glEnable(GL_SCISSOR_TEST) : glDisable(GL_SCISSOR_TEST);
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}
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void GLTexture2D::apply(const bool &value)
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{
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value ? glEnable(GL_TEXTURE_2D) : glDisable(GL_TEXTURE_2D);
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}
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void GLBlendMode::apply(const BlendType &value)
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{
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switch (value)
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{
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case BlendNone :
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glBlendEquation(GL_FUNC_ADD);
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glBlendFunc(GL_ONE, GL_ZERO);
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break;
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case BlendNormal :
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glBlendEquation(GL_FUNC_ADD);
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glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
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GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
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break;
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case BlendAddition :
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glBlendEquation(GL_FUNC_ADD);
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glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE,
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GL_ONE, GL_ONE);
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break;
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case BlendSubstraction :
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// FIXME Alpha calculation is untested
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glBlendEquation(GL_FUNC_REVERSE_SUBTRACT);
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glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE,
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GL_ONE, GL_ONE);
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break;
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}
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}
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void GLViewport::apply(const IntRect &value)
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{
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glViewport(value.x, value.y, value.w, value.h);
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}
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GLState::Caps::Caps()
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{
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glGetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTexSize);
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}
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GLState::GLState()
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{
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glEnable(GL_BLEND);
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glDisable(GL_DEPTH_TEST);
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clearColor.init(Vec4(0, 0, 0, 1));
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blendMode.init(BlendNormal);
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scissorTest.init(false);
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scissorBox.init(IntRect(0, 0, 640, 480));
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texture2D.init(true);
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}
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