[occt.git] / src / Shaders / PBREnvBaking.vs

THE_SHADER_OUT vec3 ViewDirection; //!< direction of fetching from environment cubemap

uniform int uCurrentSide; //!< current side of cubemap
uniform int uYCoeff;      //!< coefficient of Y controlling horizontal flip of cubemap
uniform int uZCoeff;      //!< coefficient of Z controlling vertical flip of cubemap

const mat2 cubemapDirectionMatrices[6] = mat2[]
(
  mat2 ( 0, -1, -1,  0),
  mat2 ( 0,  1, -1,  0),
  mat2 ( 0,  1,  1,  0),
  mat2 ( 0,  1, -1,  0),
  mat2 ( 1,  0,  0, -1),
  mat2 (-1,  0,  0, -1)
);

//! Generates environment map fetching direction considering current index of side.
vec3 cubemapBakingViewDirection (in int theSide,
                                 in vec2 theScreenCoord)
{
  int anAxis = theSide / 2;
  vec3 aDirection = vec3(0.0);
  aDirection[anAxis] = float(-(int(theSide) % 2) * 2 + 1);
  theScreenCoord = cubemapDirectionMatrices[theSide] * theScreenCoord;
  aDirection[(anAxis + 1) % 3] = theScreenCoord.x;
  aDirection[(anAxis + 2) % 3] = theScreenCoord.y;
  return aDirection;
}

void main()
{
  ViewDirection = cubemapBakingViewDirection (uCurrentSide, occVertex.xy);
  ViewDirection = cubemapVectorTransform (ViewDirection, uYCoeff, uZCoeff);
  gl_Position = vec4 (occVertex.xy, 0.0, 1.0);
}
Commit	Line	Data
67312b79	1	THE_SHADER_OUT vec3 ViewDirection; //!< direction of fetching from environment cubemap
	2
	3	uniform int uCurrentSide; //!< current side of cubemap
	4	uniform int uYCoeff; //!< coefficient of Y controlling horizontal flip of cubemap
	5	uniform int uZCoeff; //!< coefficient of Z controlling vertical flip of cubemap
	6
	7	const mat2 cubemapDirectionMatrices[6] = mat2[]
	8	(
	9	mat2 ( 0, -1, -1, 0),
	10	mat2 ( 0, 1, -1, 0),
	11	mat2 ( 0, 1, 1, 0),
	12	mat2 ( 0, 1, -1, 0),
	13	mat2 ( 1, 0, 0, -1),
	14	mat2 (-1, 0, 0, -1)
	15	);
	16
	17	//! Generates environment map fetching direction considering current index of side.
	18	vec3 cubemapBakingViewDirection (in int theSide,
	19	in vec2 theScreenCoord)
	20	{
	21	int anAxis = theSide / 2;
	22	vec3 aDirection = vec3(0.0);
	23	aDirection[anAxis] = float(-(int(theSide) % 2) * 2 + 1);
	24	theScreenCoord = cubemapDirectionMatrices[theSide] * theScreenCoord;
	25	aDirection[(anAxis + 1) % 3] = theScreenCoord.x;
	26	aDirection[(anAxis + 2) % 3] = theScreenCoord.y;
	27	return aDirection;
	28	}
	29
	30	void main()
	31	{
	32	ViewDirection = cubemapBakingViewDirection (uCurrentSide, occVertex.xy);
	33	ViewDirection = cubemapVectorTransform (ViewDirection, uYCoeff, uZCoeff);
	34	gl_Position = vec4 (occVertex.xy, 0.0, 1.0);
	35	}