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Add torus shadow render example.

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This commit is contained in:
yunfeibai
2016-11-29 13:50:49 -08:00
parent 1fbd78ece5
commit b40c9cde96
2 changed files with 41 additions and 37 deletions
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36
examples/TinyRenderer/our_gl.cpp
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@@ -8,18 +8,6 @@ IShader::~IShader() {}
Matrix viewport(int x, int y, int w, int h)
{
/*
Matrix Viewport;
Viewport = Matrix::identity();
Viewport[0][3] = x+w/2.f;
Viewport[1][3] = y+h/2.f;
Viewport[2][3] = 1.f;
Viewport[0][0] = w/2.f;
Viewport[1][1] = h/2.f;
Viewport[2][2] = 0;
return Viewport;
*/
Matrix Viewport;
Viewport = Matrix::identity();
Viewport[0][3] = x+w/2.f;
@@ -29,7 +17,6 @@ Matrix viewport(int x, int y, int w, int h)
Viewport[1][1] = h/2.f;
Viewport[2][2] = .5f;
return Viewport;
}
Matrix projection(float coeff) {
@@ -40,23 +27,6 @@ Matrix projection(float coeff) {
}
Matrix lookat(Vec3f eye, Vec3f center, Vec3f up) {
/*
Vec3f z = (eye-center).normalize();
Vec3f x = cross(up,z).normalize();
Vec3f y = cross(z,x).normalize();
Matrix Minv = Matrix::identity();
Matrix Tr = Matrix::identity();
for (int i=0; i<3; i++) {
Minv[0][i] = x[i];
Minv[1][i] = y[i];
Minv[2][i] = z[i];
Tr[i][3] = -center[i];
}
Matrix ModelView;
ModelView = Minv*Tr;
return ModelView;
*/
Vec3f f = (center - eye).normalize();
Vec3f u = up.normalize();
Vec3f s = cross(f,u).normalize();
@@ -85,7 +55,6 @@ Matrix lookat(Vec3f eye, Vec3f center, Vec3f up) {
ModelView[3][3] = 1.f;
return ModelView;
}
Vec3f barycentric(Vec2f A, Vec2f B, Vec2f C, Vec2f P) {
@@ -113,7 +82,6 @@ void triangle(mat<4,3,float> &clipc, IShader &shader, TGAImage &image, float *zb
if (pts[0][3]<0 || pts[1][3] <0 || pts[2][3] <0)
return;
mat<3,2,float> pts2;
for (int i=0; i<3; i++) pts2[i] = proj<2>(pts[i]/pts[i][3]);
@@ -128,15 +96,11 @@ void triangle(mat<4,3,float> &clipc, IShader &shader, TGAImage &image, float *zb
}
}
Vec2i P;
TGAColor color;
for (P.x=bboxmin.x; P.x<=bboxmax.x; P.x++) {
for (P.y=bboxmin.y; P.y<=bboxmax.y; P.y++) {
Vec3f bc_screen = barycentric(pts2[0], pts2[1], pts2[2], P);
Vec3f bc_clip = Vec3f(bc_screen.x/pts[0][3], bc_screen.y/pts[1][3], bc_screen.z/pts[2][3]);
bc_clip = bc_clip/(bc_clip.x+bc_clip.y+bc_clip.z);
float frag_depth = -1*(clipc[2]*bc_clip);