115 lines
2.6 KiB
C++
115 lines
2.6 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 "shader.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 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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void GLProgram::apply(const unsigned int &value)
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{
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glUseProgram(value);
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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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program.init(0);
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}
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