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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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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:
{