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reverse Z fixes

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This commit is contained in:
milek7
2018-07-24 18:57:38 +02:00
parent 1aed27ad1f
commit 17ad436976
3 changed files with 29 additions and 23 deletions
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20
frustum.cpp
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@@ -72,17 +72,17 @@ cFrustum::calculate( glm::mat4 const &Projection, glm::mat4 const &Modelview ) {
m_frustum[ side_TOP ][ plane_D ] = clip[ 15 ] - clip[ 13 ];
normalize_plane( side_TOP );
m_frustum[ side_FRONT ][ plane_A ] = clip[ 3 ] - clip[ 2 ];
m_frustum[ side_FRONT ][ plane_B ] = clip[ 7 ] - clip[ 6 ];
m_frustum[ side_FRONT ][ plane_C ] = clip[ 11 ] - clip[ 10 ];
m_frustum[ side_FRONT ][ plane_D ] = clip[ 15 ] - clip[ 14 ];
normalize_plane( side_FRONT );
m_frustum[ side_BACK ][ plane_A ] = clip[ 3 ] + clip[ 2 ];
m_frustum[ side_BACK ][ plane_B ] = clip[ 7 ] + clip[ 6 ];
m_frustum[ side_BACK ][ plane_C ] = clip[ 11 ] + clip[ 10 ];
m_frustum[ side_BACK ][ plane_D ] = clip[ 15 ] + clip[ 14 ];
m_frustum[ side_BACK ][ plane_A ] = clip[ 3 ] - clip[ 2 ];
m_frustum[ side_BACK ][ plane_B ] = clip[ 7 ] - clip[ 6 ];
m_frustum[ side_BACK ][ plane_C ] = clip[ 11 ] - clip[ 10 ];
m_frustum[ side_BACK ][ plane_D ] = clip[ 15 ] - clip[ 14 ];
normalize_plane( side_BACK );
m_frustum[ side_FRONT ][ plane_A ] = clip[ 3 ] + clip[ 2 ];
m_frustum[ side_FRONT ][ plane_B ] = clip[ 7 ] + clip[ 6 ];
m_frustum[ side_FRONT ][ plane_C ] = clip[ 11 ] + clip[ 10 ];
m_frustum[ side_FRONT ][ plane_D ] = clip[ 15 ] + clip[ 14 ];
normalize_plane( side_FRONT );
}
bool

31
renderer.cpp
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@@ -678,6 +678,7 @@ glm::mat4 opengl_renderer::perspective_projection(float fovy, float aspect, floa
{
const float f = 1.0f / tan(fovy / 2.0f);
// when clip_control available, use projection matrix with 1..0 Z range and infinite zfar
return glm::mat4( //
f / aspect, 0.0f, 0.0f, 0.0f, //
0.0f, f, 0.0f, 0.0f, //
@@ -686,6 +687,8 @@ glm::mat4 opengl_renderer::perspective_projection(float fovy, float aspect, floa
);
}
else
// or use standard matrix but with 1..-1 Z range
// (reverse Z don't give any extra precision without clip_control, but it is used anyway for consistency)
return glm::mat4( //
1.0f, 0.0f, 0.0f, 0.0f, //
0.0f, 1.0f, 0.0f, 0.0f, //
@@ -697,22 +700,15 @@ glm::mat4 opengl_renderer::perspective_projection(float fovy, float aspect, floa
glm::mat4 opengl_renderer::perpsective_frustumtest_projection(float fovy, float aspect, float znear, float zfar)
{
if (GLEW_ARB_clip_control)
return glm::mat4( //
1.0f, 0.0f, 0.0f, 0.0f, //
0.0f, 1.0f, 0.0f, 0.0f, //
0.0f, 0.0f, -0.5f, 0.0f, //
0.0f, 0.0f, 0.5f, 1.0f //
) *
glm::perspective(fovy, aspect, znear, zfar);
else
return perspective_projection(fovy, aspect, znear, zfar);
// for frustum calculation, use standard opengl matrix
return glm::perspective(fovy, aspect, znear, zfar);
}
glm::mat4 opengl_renderer::ortho_projection(float l, float r, float b, float t, float znear, float zfar)
{
glm::mat4 proj = glm::ortho(l, r, b, t, znear, zfar);
if (GLEW_ARB_clip_control)
// when clip_control available, use projection matrix with 1..0 Z range
return glm::mat4( //
1.0f, 0.0f, 0.0f, 0.0f, //
0.0f, 1.0f, 0.0f, 0.0f, //
@@ -721,6 +717,8 @@ glm::mat4 opengl_renderer::ortho_projection(float l, float r, float b, float t,
) *
proj;
else
// or use standard matrix but with 1..-1 Z range
// (reverse Z don't give any extra precision without clip_control, but it is used anyway for consistency)
return glm::mat4( //
1.0f, 0.0f, 0.0f, 0.0f, //
0.0f, 1.0f, 0.0f, 0.0f, //
@@ -730,6 +728,12 @@ glm::mat4 opengl_renderer::ortho_projection(float l, float r, float b, float t,
proj;
}
glm::mat4 opengl_renderer::ortho_frustumtest_projection(float l, float r, float b, float t, float znear, float zfar)
{
// for frustum calculation, use standard opengl matrix
return glm::ortho(l, r, b, t, znear, zfar);
}
void opengl_renderer::setup_pass(renderpass_config &Config, rendermode const Mode, float const Znear, float const Zfar, bool const Ignoredebug)
{
@@ -842,6 +846,7 @@ void opengl_renderer::setup_pass(renderpass_config &Config, rendermode const Mod
// ...use the dimensions to set up light projection boundaries...
// NOTE: since we only have one cascade map stage, we extend the chunk forward/back to catch areas normally covered by other stages
camera.projection() = ortho_projection(frustumchunkmin.x, frustumchunkmax.x, frustumchunkmin.y, frustumchunkmax.y, frustumchunkmin.z - 500.f, frustumchunkmax.z + 500.f);
frustumtest_proj = ortho_frustumtest_projection(frustumchunkmin.x, frustumchunkmax.x, frustumchunkmin.y, frustumchunkmax.y, frustumchunkmin.z - 500.f, frustumchunkmax.z + 500.f);
/*
// fixed ortho projection from old build, for quick quality comparisons
camera.projection() *=
@@ -869,8 +874,6 @@ void opengl_renderer::setup_pass(renderpass_config &Config, rendermode const Mod
// ... and bake the adjustment into the projection matrix
camera.projection() = glm::translate(glm::mat4{1.f}, glm::vec3{shadowmapadjustment, 0.f}) * camera.projection();
frustumtest_proj = camera.projection();
break;
}
case rendermode::cabshadows:
@@ -883,8 +886,8 @@ void opengl_renderer::setup_pass(renderpass_config &Config, rendermode const Mod
// projection
auto const maphalfsize{Config.draw_range * 0.5f};
camera.projection() = ortho_projection(-maphalfsize, maphalfsize, -maphalfsize, maphalfsize, -Config.draw_range, Config.draw_range);
frustumtest_proj = ortho_frustumtest_projection(-maphalfsize, maphalfsize, -maphalfsize, maphalfsize, -Config.draw_range, Config.draw_range);
frustumtest_proj = camera.projection();
/*
// adjust the projection to sample complete shadow map texels
auto shadowmaptexel = glm::vec2 { camera.projection() * glm::mat4{ viewmatrix } * glm::vec4{ 0.f, 0.f, 0.f, 1.f } };
@@ -997,6 +1000,7 @@ void opengl_renderer::setup_shadow_map(opengl_texture *tex, renderpass_config co
glm::mat4 coordmove;
if (GLEW_ARB_clip_control)
// transform 1..-1 NDC xy coordinates to 1..0
coordmove = glm::mat4( //
0.5, 0.0, 0.0, 0.0, //
0.0, 0.5, 0.0, 0.0, //
@@ -1004,6 +1008,7 @@ void opengl_renderer::setup_shadow_map(opengl_texture *tex, renderpass_config co
0.5, 0.5, 0.0, 1.0 //
);
else
// without clip_control we also need to transform z
coordmove = glm::mat4( //
0.5, 0.0, 0.0, 0.0, //
0.0, 0.5, 0.0, 0.0, //

1
renderer.h
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@@ -349,6 +349,7 @@ class opengl_renderer
glm::mat4 perspective_projection(float fov, float aspect, float z_near, float z_far);
glm::mat4 perpsective_frustumtest_projection(float fov, float aspect, float z_near, float z_far);
glm::mat4 ortho_projection(float left, float right, float bottom, float top, float z_near, float z_far);
glm::mat4 ortho_frustumtest_projection(float left, float right, float bottom, float top, float z_near, float z_far);
std::unique_ptr<gl::shader> m_vertex_shader;