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add alpha blendering option (disabled by default) using w component of color

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add low-level support function demo (test)
This commit is contained in:
Erwin Coumans
2014-10-15 18:05:11 -07:00
parent ce0ad64475
commit eda1ff77db
8 changed files with 147 additions and 10 deletions
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2
btgui/OpenGLWindow/CommonGraphicsApp.h
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@@ -44,7 +44,7 @@ struct CommonGraphicsApp
virtual void drawText( const char* txt, int posX, int posY) = 0;
virtual int registerCubeShape(float halfExtentsX,float halfExtentsY, float halfExtentsZ)=0;
virtual int registerGraphicsSphereShape(float radius, bool usePointSprites, int largeSphereThreshold, int mediumSphereThreshold)=0;
virtual int registerGraphicsSphereShape(float radius, bool usePointSprites=true, int largeSphereThreshold=100, int mediumSphereThreshold=10)=0;
};

1
btgui/OpenGLWindow/CommonRenderInterface.h
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@@ -45,6 +45,7 @@ struct CommonRenderInterface
virtual void writeSingleInstanceTransformToCPU(const float* position, const float* orientation, int srcIndex)=0;
virtual void writeSingleInstanceTransformToCPU(const double* position, const double* orientation, int srcIndex)=0;
virtual void writeTransforms()=0;
virtual void enableBlend(bool blend)=0;
};
#endif//COMMON_RENDER_INTERFACE_H

24
btgui/OpenGLWindow/GLInstancingRenderer.cpp
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@@ -380,7 +380,8 @@ GLInstancingRenderer::GLInstancingRenderer(int maxNumObjectCapacity, int maxShap
m_textureinitialized(false),
m_screenWidth(0),
m_screenHeight(0),
m_upAxis(1)
m_upAxis(1),
m_enableBlend(false)
{
m_data = new InternalDataRenderer;
@@ -1593,14 +1594,14 @@ void GLInstancingRenderer::renderSceneInternal(int renderMode)
// m_data->m_shadowMap->disable();
// return;
// glEnable(GL_CULL_FACE);
// glCullFace(GL_BACK); // Cull back-facing triangles -> draw only front-facing triangles
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK); // Cull back-facing triangles -> draw only front-facing triangles
b3Assert(glGetError() ==GL_NO_ERROR);
} else
{
glDisable(GL_CULL_FACE);
//glCullFace(GL_BACK);
//glDisable(GL_CULL_FACE);
glCullFace(GL_BACK);
}
@@ -1794,6 +1795,12 @@ b3Assert(glGetError() ==GL_NO_ERROR);
case B3_USE_SHADOWMAP_RENDERMODE:
{
if (m_enableBlend)
{
glEnable (GL_BLEND);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
glUseProgram(useShadowMapInstancingShader);
glUniformMatrix4fv(useShadow_ProjectionMatrix, 1, false, &projectionMatrix[0]);
glUniformMatrix4fv(useShadow_ModelViewMatrix, 1, false, &modelviewMatrix[0]);
@@ -1808,7 +1815,12 @@ b3Assert(glGetError() ==GL_NO_ERROR);
glBindTexture(GL_TEXTURE_2D, m_data->m_shadowTexture);
glUniform1i(useShadow_shadowMap,1);
glDrawElementsInstanced(GL_TRIANGLES, indexCount, GL_UNSIGNED_INT, indexOffset, gfxObj->m_numGraphicsInstances);
break;
if (m_enableBlend)
{
glDisable (GL_BLEND);
}
break;
}
default:
{

7
btgui/OpenGLWindow/GLInstancingRenderer.h
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@@ -43,7 +43,8 @@ class GLInstancingRenderer : public CommonRenderInterface
int m_screenHeight;
int m_upAxis;
bool m_enableBlend;
void renderSceneInternal(int renderMode=B3_DEFAULT_RENDERMODE);
@@ -156,6 +157,10 @@ public:
return m_maxNumObjectCapacity;
}
void enableShadowMap();
virtual void enableBlend(bool blend)
{
m_enableBlend = blend;
}
};

2
btgui/OpenGLWindow/Shaders/useShadowMapInstancingPS.glsl
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@@ -52,5 +52,5 @@ void main(void)
if (visibility<0.6)
visibility=0.6f;
color = vec4(ct * visibility, 1.f);//at * af);
color = vec4(ct * visibility, fragment.color.w);
}

2
btgui/OpenGLWindow/Shaders/useShadowMapInstancingPS.h
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@@ -44,6 +44,6 @@ static const char* useShadowMapInstancingFragmentShader= \
" if (visibility<0.6)\n"
" visibility=0.6f;\n"
" \n"
" color = vec4(ct * visibility, 1.f);//at * af); \n"
" color = vec4(ct * visibility, fragment.color.w);\n"
"}\n"
;