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#pragma once
#include "OpenGL.h"
#include <vector>
struct RenderCommand
{
virtual void Execute() = 0;
};
typedef std::vector<RenderCommand*> RenderCommandGroup;
void ReleaseRenderCommandGroup(RenderCommandGroup& group);
// Cull Off|Front|Back|Both
struct Cmd_Cull : RenderCommand
{
enum ECullFace {
Cull_Disable,
Cull_Front,
Cull_Back,
Cull_Both,
};
ECullFace cull;
void Execute() override
{
if (cull == ECullFace::Cull_Disable)
{
glDisable(GL_CULL_FACE);
return;
}
glEnable(GL_CULL_FACE);
switch (cull)
{
case ECullFace::Cull_Front: glCullFace(GL_FRONT); break;
case ECullFace::Cull_Back: glCullFace(GL_BACK); break;
case ECullFace::Cull_Both: glCullFace(GL_FRONT_AND_BACK); break;
}
}
};
// Blend Off
// Blend <srcFac> <dstFac>
struct Cmd_Blend : RenderCommand
{
enum EBlend
{
Blend_Zero, // 0
Blend_One, // 1
Blend_Src_Color, // 源颜色向量C¯source
Blend_One_Minus_Src_Color, // 1−C¯source
Blend_Dst_Color, // 目标颜色向量C¯destination
Blend_One_Minus_Dst_Color, // 1−C¯destination
Blend_Src_Alpha, // C¯source的alpha值
Blend_One_Minus_Src_Alpha, // 1− C¯source的alpha值
Blend_Dst_Alpha, // C¯destination的alpha值
Blend_One_Minus_Dst_Alpha, // 1− C¯destination的alpha值
Blend_Constant_Color, // 常颜色向量C¯constant
Blend_One_Minus_Constant_Color, // 1−C¯constant
Blend_Constant_Alpha, // C¯constant的alpha值
Blend_One_Minus_Constant_Alpha, // 1− C¯constant的alpha值
};
bool enable;
EBlend srcFac;
EBlend dstFac;
void Execute() override
{
if (!enable)
glDisable(GL_BLEND);
glEnable(GL_BLEND);
glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD);
GLenum src, dst;
switch (srcFac)
{
case EBlend::Blend_Zero: src = GL_ZERO; break;
case EBlend::Blend_One: src = GL_ONE; break;
case EBlend::Blend_Src_Color: src = GL_SRC_COLOR; break;
case EBlend::Blend_One_Minus_Src_Color: src = GL_ONE_MINUS_SRC_COLOR; break;
case EBlend::Blend_Dst_Color: src = GL_DST_COLOR; break;
case EBlend::Blend_One_Minus_Dst_Color: src = GL_ONE_MINUS_DST_COLOR; break;
case EBlend::Blend_Src_Alpha: src = GL_SRC_ALPHA; break;
case EBlend::Blend_One_Minus_Src_Alpha: src = GL_ONE_MINUS_SRC_ALPHA; break;
case EBlend::Blend_Dst_Alpha: src = GL_DST_ALPHA; break;
case EBlend::Blend_One_Minus_Dst_Alpha: src = GL_ONE_MINUS_DST_ALPHA; break;
case EBlend::Blend_Constant_Color: src = GL_CONSTANT_COLOR; break;
case EBlend::Blend_One_Minus_Constant_Color: src = GL_ONE_MINUS_CONSTANT_COLOR; break;
case EBlend::Blend_Constant_Alpha: src = GL_CONSTANT_ALPHA; break;
case EBlend::Blend_One_Minus_Constant_Alpha: src = GL_ONE_MINUS_CONSTANT_ALPHA; break;
}
switch (dstFac)
{
case EBlend::Blend_Zero: dst = GL_ZERO; break;
case EBlend::Blend_One: dst = GL_ONE; break;
case EBlend::Blend_Src_Color: dst = GL_SRC_COLOR; break;
case EBlend::Blend_One_Minus_Src_Color: dst = GL_ONE_MINUS_SRC_COLOR; break;
case EBlend::Blend_Dst_Color: dst = GL_DST_COLOR; break;
case EBlend::Blend_One_Minus_Dst_Color: dst = GL_ONE_MINUS_DST_COLOR; break;
case EBlend::Blend_Src_Alpha: dst = GL_SRC_ALPHA; break;
case EBlend::Blend_One_Minus_Src_Alpha: dst = GL_ONE_MINUS_SRC_ALPHA; break;
case EBlend::Blend_Dst_Alpha: dst = GL_DST_ALPHA; break;
case EBlend::Blend_One_Minus_Dst_Alpha: dst = GL_ONE_MINUS_DST_ALPHA; break;
case EBlend::Blend_Constant_Color: dst = GL_CONSTANT_COLOR; break;
case EBlend::Blend_One_Minus_Constant_Color: dst = GL_ONE_MINUS_CONSTANT_COLOR; break;
case EBlend::Blend_Constant_Alpha: dst = GL_CONSTANT_ALPHA; break;
case EBlend::Blend_One_Minus_Constant_Alpha: dst = GL_ONE_MINUS_CONSTANT_ALPHA; break;
}
glBlendFunc(src, dst);
}
};
// DepthTest Off|<func>
struct Cmd_DepthTest : RenderCommand
{
enum EDepthTest
{
DepthTest_Off, // 不进行深度测试
DepthTest_Always, // 永远通过测试
DepthTest_Never, // 永远不通过测试
DepthTest_Less, // 在片段深度值小于缓冲区的深度时通过测试
DepthTest_Equal, // 在片段深度值等于缓冲区的深度时通过测试
DepthTest_Lequal, // 在片段深度值小于等于缓冲区的深度时通过测试
DepthTest_Greater, // 在片段深度值大于缓冲区的深度时通过测试
DepthTest_Notequal, // 在片段深度值不等于缓冲区的深度时通过测试
DepthTest_Gequal, // 在片段深度值大于等于缓冲区的深度时通过测试
};
EDepthTest test;
void Execute() override
{
if (test == EDepthTest::DepthTest_Off)
{
glDisable(GL_DEPTH_TEST);
return;
}
glEnable(GL_DEPTH_TEST);
switch (test)
{
case EDepthTest::DepthTest_Always: glDepthFunc(GL_ALWAYS); break;
case EDepthTest::DepthTest_Never: glDepthFunc(GL_NEVER); break;
case EDepthTest::DepthTest_Less: glDepthFunc(GL_LESS); break;
case EDepthTest::DepthTest_Equal: glDepthFunc(GL_EQUAL); break;
case EDepthTest::DepthTest_Lequal: glDepthFunc(GL_LEQUAL); break;
case EDepthTest::DepthTest_Greater: glDepthFunc(GL_GREATER); break;
case EDepthTest::DepthTest_Notequal: glDepthFunc(GL_NOTEQUAL); break;
case EDepthTest::DepthTest_Gequal: glDepthFunc(GL_GEQUAL); break;
}
}
};
// DepthWrite Off|On
struct Cmd_DepthWrite : RenderCommand
{
bool write;
void Execute() override
{
if(write)
glDepthMask(GL_TRUE);
else
glDepthMask(GL_FALSE);
}
};
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