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Render shadow buffer.

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This commit is contained in:
yunfeibai
2016-11-21 09:13:20 -08:00
parent be5b8a3d7b
commit 5be4409a1a
2 changed files with 85 additions and 2 deletions
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56
examples/TinyRenderer/TinyRenderer.cpp
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@@ -13,7 +13,7 @@
#include "LinearMath/btAlignedObjectArray.h"
#include "LinearMath/btVector3.h"
const float depth = 2.f;
struct Shader : public IShader {
@@ -94,6 +94,55 @@ struct Shader : public IShader {
}
};
struct DepthShader : public IShader {
Model* m_model;
Matrix& m_modelMat;
Matrix m_invModelMat;
Matrix& m_modelView1;
Matrix& m_projectionMatrix;
Vec3f m_localScaling;
Matrix& m_lightModelView;
mat<2,3,float> varying_uv; // triangle uv coordinates, written by the vertex shader, read by the fragment shader
mat<4,3,float> varying_tri; // triangle coordinates (clip coordinates), written by VS, read by FS
mat<4,3,float> varying_tri_light_view; // triangle coordinates (clip coordinates), written by VS, read by FS
mat<3,3,float> varying_nrm; // normal per vertex to be interpolated by FS
DepthShader(Model* model, Matrix& modelView, Matrix& lightModelView, Matrix& projectionMatrix, Matrix& modelMat, Vec3f localScaling)
:m_model(model),
m_modelView1(modelView),
m_lightModelView(lightModelView),
m_projectionMatrix(projectionMatrix),
m_modelMat(modelMat),
m_localScaling(localScaling)
{
m_invModelMat = m_modelMat.invert_transpose();
}
virtual Vec4f vertex(int iface, int nthvert) {
Vec2f uv = m_model->uv(iface, nthvert);
varying_uv.set_col(nthvert, uv);
varying_nrm.set_col(nthvert, proj<3>(m_invModelMat*embed<4>(m_model->normal(iface, nthvert), 0.f)));
Vec3f unScaledVert = m_model->vert(iface, nthvert);
Vec3f scaledVert=Vec3f(unScaledVert[0]*m_localScaling[0],
unScaledVert[1]*m_localScaling[1],
unScaledVert[2]*m_localScaling[2]);
Vec4f gl_Vertex = m_projectionMatrix*m_modelView1*embed<4>(scaledVert);
varying_tri.set_col(nthvert, gl_Vertex);
Vec4f gl_VertexLightView = m_projectionMatrix*m_lightModelView*embed<4>(scaledVert);
varying_tri_light_view.set_col(nthvert, gl_VertexLightView);
return gl_Vertex;
}
virtual bool fragment(Vec3f bar, TGAColor &color) {
Vec4f p = varying_tri_light_view*bar;
printf("coefficient: %f\n", 1.0-p[2]/depth);
color = TGAColor(255, 255, 255)*(1.0-p[2]/depth);
return false;
}
};
TinyRenderObjectData::TinyRenderObjectData(TGAImage& rgbColorBuffer,b3AlignedObjectArray<float>&depthBuffer)
:m_rgbColorBuffer(rgbColorBuffer),
m_depthBuffer(depthBuffer),
@@ -283,9 +332,12 @@ void TinyRenderer::renderObject(TinyRenderObjectData& renderData)
{
Matrix lightViewMatrix = lookat(Vec3f(0.0,0.1,2.0), Vec3f(0.0,0.0,0.0), Vec3f(0.0,0.0,1.0));
Matrix lightModelViewMatrix = lightViewMatrix*renderData.m_modelMatrix;
Matrix modelViewMatrix = renderData.m_viewMatrix*renderData.m_modelMatrix;
Vec3f localScaling(renderData.m_localScaling[0],renderData.m_localScaling[1],renderData.m_localScaling[2]);
Shader shader(model, light_dir_local, light_color, modelViewMatrix, renderData.m_projectionMatrix,renderData.m_modelMatrix, localScaling, model->getColorRGBA());
//Shader shader(model, light_dir_local, light_color, modelViewMatrix, renderData.m_projectionMatrix,renderData.m_modelMatrix, localScaling, model->getColorRGBA());
DepthShader shader(model, modelViewMatrix, lightModelViewMatrix, renderData.m_projectionMatrix,renderData.m_modelMatrix, localScaling);
//printf("Render %d triangles.\n",model->nfaces());
for (int i=0; i<model->nfaces(); i++)