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0024402: TKOpenGl - Implement clipping planes in Phong GLSL program

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Limit number of lights (breaks compatibility with old hardware).
This commit is contained in:
duv
2014-02-13 13:06:51 +04:00
committed by apn
parent 816d03eef3
commit 5495fa7e65
6 changed files with 45 additions and 13 deletions
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1
src/Shaders/Declarations.glsl
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@@ -77,3 +77,4 @@ const int OccEquationCoords_World = 1; //!< world-space clipping plane
//! Parameters of clipping planes
uniform vec4 occClipPlaneEquations[THE_MAX_CLIP_PLANES];
uniform int occClipPlaneSpaces [THE_MAX_CLIP_PLANES];
uniform int occClipPlaneCount; //!< Total number of clip planes

28
src/Shaders/PhongShading.fs
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@@ -13,9 +13,10 @@
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
varying vec3 View; //!< Direction to the viewer
varying vec3 Normal; //!< Vertex normal in view space
varying vec4 Position; //!< Vertex position in view space.
varying vec3 View; //!< Direction to the viewer
varying vec3 Normal; //!< Vertex normal in view space
varying vec4 Position; //!< Vertex position in view space.
varying vec4 PositionWorld; //!< Vertex position in world space
vec3 Ambient; //!< Ambient contribution of light sources
vec3 Diffuse; //!< Diffuse contribution of light sources
@@ -172,6 +173,27 @@ vec4 computeLighting (in vec3 theNormal,
//! Entry point to the Fragment Shader
void main()
{
// process clipping planes
for (int anIndex = 0; anIndex < occClipPlaneCount; ++anIndex)
{
vec4 aClipEquation = occClipPlaneEquations[anIndex];
int aClipSpace = occClipPlaneSpaces[anIndex];
if (aClipSpace == OccEquationCoords_World)
{
if (dot (aClipEquation.xyz, PositionWorld.xyz) + aClipEquation.w < 0.0)
{
discard;
}
}
else if (aClipSpace == OccEquationCoords_View)
{
if (dot (aClipEquation.xyz, Position.xyz) + aClipEquation.w < 0.0)
{
discard;
}
}
}
gl_FragColor = computeLighting (normalize (Normal),
normalize (View),
Position);

12
src/Shaders/PhongShading.vs
View File

@@ -13,9 +13,10 @@
// Alternatively, this file may be used under the terms of Open CASCADE
// commercial license or contractual agreement.
varying vec3 View; //!< Direction to the viewer
varying vec3 Normal; //!< Vertex normal in view space
varying vec4 Position; //!< Vertex position in view space
varying vec3 View; //!< Direction to the viewer
varying vec3 Normal; //!< Vertex normal in view space
varying vec4 Position; //!< Vertex position in view space
varying vec4 PositionWorld; //!< Vertex position in world space
//! Computes the normal in view space
vec3 TransformNormal (in vec3 theNormal)
@@ -29,8 +30,9 @@ vec3 TransformNormal (in vec3 theNormal)
//! Entry point to the Vertex Shader
void main()
{
Position = occWorldViewMatrix * occModelWorldMatrix * occVertex; // position in the view space
Normal = TransformNormal (occNormal); // normal in the view space
PositionWorld = occModelWorldMatrix * occVertex;
Position = occWorldViewMatrix * PositionWorld;
Normal = TransformNormal (occNormal);
// Note: The specified view vector is absolutely correct only for the orthogonal projection.
// For perspective projection it will be approximate, but it is in good agreement with the OpenGL calculations.