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/* Copyright (C) 2012 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. 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.
*
* 0 A.D. 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 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#include "precompiled.h"
#include "ShaderTechnique.h"
#include "graphics/ShaderProgram.h"
CShaderPass::CShaderPass() :
m_HasAlpha(false), m_HasBlend(false), m_HasColorMask(false), m_HasDepthMask(false), m_HasDepthFunc(false)
{
}
void CShaderPass::Bind()
{
m_Shader->Bind();
#if !CONFIG2_GLES
if (m_HasAlpha)
{
glEnable(GL_ALPHA_TEST);
glAlphaFunc(m_AlphaFunc, m_AlphaRef);
}
#endif
// TODO: maybe emit some warning if GLSL shaders try to use alpha test;
// the test should be done inside the shader itself
if (m_HasBlend)
{
glEnable(GL_BLEND);
glBlendFunc(m_BlendSrc, m_BlendDst);
}
if (m_HasColorMask)
glColorMask(m_ColorMaskR, m_ColorMaskG, m_ColorMaskB, m_ColorMaskA);
if (m_HasDepthMask)
glDepthMask(m_DepthMask);
if (m_HasDepthFunc)
glDepthFunc(m_DepthFunc);
}
void CShaderPass::Unbind()
{
m_Shader->Unbind();
#if !CONFIG2_GLES
if (m_HasAlpha)
glDisable(GL_ALPHA_TEST);
#endif
if (m_HasBlend)
glDisable(GL_BLEND);
if (m_HasColorMask)
glColorMask(1, 1, 1, 1);
if (m_HasDepthMask)
glDepthMask(1);
if (m_HasDepthFunc)
glDepthFunc(GL_LEQUAL);
}
void CShaderPass::AlphaFunc(GLenum func, GLclampf ref)
{
m_HasAlpha = true;
m_AlphaFunc = func;
m_AlphaRef = ref;
}
void CShaderPass::BlendFunc(GLenum src, GLenum dst)
{
m_HasBlend = true;
m_BlendSrc = src;
m_BlendDst = dst;
}
void CShaderPass::ColorMask(GLboolean r, GLboolean g, GLboolean b, GLboolean a)
{
m_HasColorMask = true;
m_ColorMaskR = r;
m_ColorMaskG = g;
m_ColorMaskB = b;
m_ColorMaskA = a;
}
void CShaderPass::DepthMask(GLboolean mask)
{
m_HasDepthMask = true;
m_DepthMask = mask;
}
void CShaderPass::DepthFunc(GLenum func)
{
m_HasDepthFunc = true;
m_DepthFunc = func;
}
CShaderTechnique::CShaderTechnique()
: m_SortByDistance(false)
{
}
void CShaderTechnique::AddPass(const CShaderPass& pass)
{
m_Passes.push_back(pass);
}
int CShaderTechnique::GetNumPasses() const
{
return m_Passes.size();
}
void CShaderTechnique::BeginPass(int pass)
{
ENSURE(0 <= pass && pass < (int)m_Passes.size());
m_Passes[pass].Bind();
}
void CShaderTechnique::EndPass(int pass)
{
ENSURE(0 <= pass && pass < (int)m_Passes.size());
m_Passes[pass].Unbind();
}
const CShaderProgramPtr& CShaderTechnique::GetShader(int pass) const
{
ENSURE(0 <= pass && pass < (int)m_Passes.size());
return m_Passes[pass].GetShader();
}
bool CShaderTechnique::GetSortByDistance() const
{
return m_SortByDistance;
}
void CShaderTechnique::SetSortByDistance(bool enable)
{
m_SortByDistance = enable;
}
void CShaderTechnique::Reset()
{
m_SortByDistance = false;
m_Passes.clear();
}
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