mkxp/src/glstate.cpp

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/*
** glstate.cpp
**
** This file is part of mkxp.
**
** Copyright (C) 2013 Jonas Kulla <Nyocurio@gmail.com>
**
** mkxp 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.
**
** mkxp is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with mkxp. If not, see <http://www.gnu.org/licenses/>.
*/
#include "glstate.h"
#include "shader.h"
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#include "etc.h"
#include "gl-fun.h"
#include <SDL_rect.h>
static void applyBool(GLenum state, bool mode)
{
mode ? gl.Enable(state) : gl.Disable(state);
}
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void GLClearColor::apply(const Vec4 &value)
{
gl.ClearColor(value.x, value.y, value.z, value.w);
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}
void GLScissorBox::apply(const IntRect &value)
{
gl.Scissor(value.x, value.y, value.w, value.h);
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}
void GLScissorBox::setIntersect(const IntRect &value)
{
IntRect &current = get();
SDL_Rect r1 = { current.x, current.y, current.w, current.h };
SDL_Rect r2 = { value.x, value.y, value.w, value.h };
SDL_Rect result;
if (!SDL_IntersectRect(&r1, &r2, &result))
result.w = result.h = 0;
set(IntRect(result.x, result.y, result.w, result.h));
}
void GLScissorTest::apply(const bool &value)
{
applyBool(GL_SCISSOR_TEST, value);
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}
void GLBlendMode::apply(const BlendType &value)
{
switch (value)
{
case BlendNormal :
gl.BlendEquation(GL_FUNC_ADD);
gl.BlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,
GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
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break;
case BlendAddition :
gl.BlendEquation(GL_FUNC_ADD);
gl.BlendFuncSeparate(GL_SRC_ALPHA, GL_ONE,
GL_ONE, GL_ONE);
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break;
case BlendSubstraction :
// FIXME Alpha calculation is untested
gl.BlendEquation(GL_FUNC_REVERSE_SUBTRACT);
gl.BlendFuncSeparate(GL_SRC_ALPHA, GL_ONE,
GL_ONE, GL_ONE);
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break;
}
}
void GLBlend::apply(const bool &value)
{
applyBool(GL_BLEND, value);
}
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void GLViewport::apply(const IntRect &value)
{
gl.Viewport(value.x, value.y, value.w, value.h);
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}
void GLProgram::apply(const unsigned int &value)
{
gl.UseProgram(value);
}
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GLState::Caps::Caps()
{
gl.GetIntegerv(GL_MAX_TEXTURE_SIZE, &maxTexSize);
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}
GLState::GLState()
{
gl.Disable(GL_DEPTH_TEST);
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clearColor.init(Vec4(0, 0, 0, 1));
blendMode.init(BlendNormal);
blend.init(true);
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scissorTest.init(false);
scissorBox.init(IntRect(0, 0, 640, 480));
program.init(0);
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}