Необъяснимое поведение при использовании uniform sampler2d []
Мне очень жаль, но это потребует небольшого объяснения. Я стараюсь сделать это как можно проще.
Что я хочу сделать: Я визуализирую поля высот. Поле высоты может иметь несколько участков . Патч - это меньшая текстура, которая изменяет поле высоты.
Я использую OpenGL 4.0, в основном шейдеры тесселяции. Однако для этой проблемы это не должно иметь значения.
Что уже работает. У меня работает визуализация поля высоты (без патчей). Интересными частями в отношении проблемы являются шейдер оценки тесселяции и шейдер фрагментов.
Шейдер оценки тесселяции извлекает для каждой вершины ее высоту из сэмплера поля высоты.
layout(quads, fractional_odd_spacing, ccw) in;
out float onEdge;
out float teDistanceToMinHeight;
out vec4 tcPosition;
void main()
{
// bilinear interpolate: position
vec4 pos_a = mix(gl_in[0].gl_Position, gl_in[1].gl_Position, gl_TessCoord.x);
vec4 pos_b = mix(gl_in[3].gl_Position, gl_in[2].gl_Position, gl_TessCoord.x);
vec4 position = mix(pos_a, pos_b, gl_TessCoord.y);
// bilinear interpolate: hf texture coordinate
vec2 tex_a = mix(gl_in[0].gl_TexCoord[HFTexCoordID].xy, gl_in[1].gl_TexCoord[HFTexCoordID].xy, gl_TessCoord.x);
vec2 tex_b = mix(gl_in[3].gl_TexCoord[HFTexCoordID].xy, gl_in[2].gl_TexCoord[HFTexCoordID].xy, gl_TessCoord.x);
vec2 hfTexCoord = mix(tex_a, tex_b, gl_TessCoord.y);
float height = getHeightFieldHeight(hfTexCoord);
position.y = height;
//position.y = getHeightFieldHeightMin();
gl_Position = gl_ModelViewProjectionMatrix * position;
tcPosition = gl_Position;
gl_TexCoord[HFTexCoordID].xy = hfTexCoord;
// a vertex is on the edge of a patch if one of the tess coords is 0
onEdge = float((gl_TessCoord.x == 0 || gl_TessCoord.y == 0));
teDistanceToMinHeight = height - getHeightFieldHeightMin();
}
Фрагментный шейдер использует относительную высоту вершины, принадлежащей фрагменту под рукой, для доступа к палитре высоты 1D текстура. Пожалуйста, пока игнорируйте градиент высоты. Он используется для вычисления нормалей. Это работает совершенно нормально.
in float onEdge;
in float teDistanceToMinHeight;
in vec4 tcPosition;
out vec4 FragColor;
vec3
getHeightMapGradient(in vec2 ts_position,
in vec2 texel_offset)
{
vec3 x = vec3(2.0 * texel_offset.x, 0.0, getHeightFieldHeight(ts_position + vec2(texel_offset.x, 0.0))
- getHeightFieldHeight(ts_position - vec2(texel_offset.x, 0.0)));
vec3 y = vec3(0.0, 2.0 * texel_offset.y, getHeightFieldHeight(ts_position + vec2(0.0, texel_offset.y))
- getHeightFieldHeight(ts_position - vec2(0.0, texel_offset.y)));
return cross(x, y);
}
void main()
{
if(teDistanceToMinHeight < 0.00001){
// filter points near the zero position
discard;
}
// attributes
vec2 hfTexCoords = gl_TexCoord[HFTexCoordID].xy;
//float hfPaletteTexCoord = getHeightFieldHeight(hfTexCoords) / HeightFieldHeight;
float hfPaletteTexCoord = (texture(HeightField, hfTexCoords).r -HeightFieldLowering);
vec2 heightMapSize = vec2(textureSize(HeightField, 0).xy);
vec2 heightMapTexelSize = vec2(1.0) / vec2(heightMapSize);
// some standard colors
vec4 white = vec4(1);
vec4 yellow = vec4(1,1,0,1);
vec4 blue = vec4(0,0,1,1);
// get the color
FragColor = texture(HeightFieldPalette, hfPaletteTexCoord ); // use height field palette as color
if(onEdge > 0.9 && ShowOriginalGrid == 1 ){
FragColor = mix(FragColor, yellow, 0.5);
}
// shading
vec3 n = normalize(getHeightMapGradient(hfTexCoords, heightMapTexelSize).xzy);
vec3 l = vec3(1,1,0);
vec3 v = normalize(CameraPosition - tcPosition.xyz);
vec3 h = normalize(l + v);
float df= dot(n, l);
FragColor = (FragColor * (df * 0.5 + 0.5)) // diffuse
+ vec4(1) * pow(max(0.0, dot(n,h)), 60.0) // specular
+ 0.1; // ambient
}
Включает перед каждым шейдером следующий код. Он содержит в основном все унифицированные и вспомогательные функции.
#version 400 compatibility
// defines
#define HFTexCoordID 0
// environment
uniform ivec2 ScreenSize = ivec2(800,600);
uniform vec3 CameraPosition = vec3(0);
// tesselation
uniform float MaxEdgeLength = 4;
// height field
uniform float HeightFieldHeight = 1;
uniform float HeightFieldLowering = 0.2;
uniform sampler2D HeightField;
uniform sampler1D HeightFieldPalette;
// density map
uniform sampler2D DensityMap;
// patches
uniform sampler2D[20] Patches;
uniform int PatchesCount = 0;
uniform ivec2[20] PatchesPositions;
uniform float[20] PatchesHeights;
uniform ivec2[20] PatchesSizes;
// show options
uniform int ShowOriginalGrid = 0;
// functions
ivec2 getHFPosition(vec2 hfTexCoords){
return ivec2(textureSize(HeightField, 0).xy * hfTexCoords);
}
ivec2 getPatchSize(in int patchIndex){
return PatchesSizes[patchIndex];
//return textureSize(Patches[patchIndex], 0).xy;
}
vec2 toPatchCoords(in int patchIndex, in vec2 hfTexCoords){
ivec2 hfPosition = getHFPosition(hfTexCoords);
ivec2 patchStart = PatchesPositions[patchIndex];
ivec2 patchPos = hfPosition - patchStart;
//return textureSize(Patches[1], 0).xy;
return vec2(patchPos / getPatchSize(patchIndex));
}
float getPatchHeight(in int patchIndex, in vec2 hfTexCoords){
vec2 patchCoords = toPatchCoords(patchIndex, hfTexCoords);
// seams like the combination of the for loop with this
// texture access results in undefined behavior.
float relHeight = (texture(Patches[patchIndex], patchCoords).r -0.5);
return relHeight * PatchesHeights[patchIndex] * HeightFieldHeight;
}
float getPatchedHeight(in vec2 texCoords){
float patchesHeight = 0;
// working
//patchesHeight += getPatchHeight(0, texCoords);
//patchesHeight += getPatchHeight(1, texCoords);
//patchesHeight += getPatchHeight(2, texCoords);
// only works for i < 5 .
for(int i = 0; i < 6 && i < PatchesCount-1; i++){
patchesHeight += getPatchHeight(i, texCoords);
}
return patchesHeight;
}
float getHeightFieldHeight(in vec2 textureCoordinates){
float height = (texture(HeightField, textureCoordinates).r -HeightFieldLowering) * HeightFieldHeight;
height += getPatchedHeight(textureCoordinates);
return height;
}
float getHeightFieldHeightMin(){
return (-0.2 * HeightFieldHeight);
}
float getDensity(in vec2 coords){
return texture(DensityMap, coords).r;
}
Проблема
Все шейдеры, описанные и вставленные выше, работают правильно, пока я не обращаюсь к униформе Патчи .
uniform sampler2D[20] Patches;
Идея sampler2D [] состоит в том, чтобы иметь своего рода массив, в то время как каждая текстура этого массива может иметь разный размер. Я знаю, что каждая из этих конструкций использует (в данном случае) 20 текстурных блоков. Это ограничение штраф.
В тот момент, когда я обращаюсь к униформе Patches, фрагментный шейдер выводит только черные пиксели. Шейдер оценки тесселяции работает правильно, это я знаю, потому что я вижу холмы в поле высоты, которые не являются его частью.
Я очень благодарен за любые предложения. Что касается этой проблемы.
Я знаю, что могу использовать sampler2DArray, но тогда каждый элемент (текстура) должен иметь одинаковый размер. Но мне нужно, чтобы размер патча был гибким. Нарезание патчей на текстуры фиксированного размера и их повторное объединение в шейдере, что могло бы быть альтернативой, но я не хочу реализовывать эту организацию накладных расходов, если мне действительно не нужно.
Infolog
Visualization Lib
rary v2011.5.1142 [f32]
Jun 9 2011 - 11:36:25 - GCC compiler [RELEASE] [x32]
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GL_SUN_slice_accum
PatchesContainer::PatchesContainer: working dir: ./data/patches/pick_height_testing_png/
PatchesContainer::loadPatchesFromWorkingDir ignoring file = data/patches/pick_height_testing_png/.svn
Patch::initialize(): name = data/patches/pick_height_testing_png/patch01-position=20x20-maxHeight=1.0.png
width = 50
height = 50
depth = 0
format = IF_LUMINANCE
type = IT_UNSIGNED_BYTE
pitch = 50
bytealign = 1
Patch::initialize(): name = data/patches/pick_height_testing_png/patch02-position=20x2-maxHeight=1.5.png
width = 20
height = 20
depth = 0
format = IF_LUMINANCE
type = IT_UNSIGNED_BYTE
pitch = 20
bytealign = 1
Found matching densitymap ./data/density_maps/pick_height_testing_png.png
loading height field image
name = ./data/horizons/pick_height_testing.png
width = 200
height = 200
depth = 0
format = IF_LUMINANCE
type = IT_UNSIGNED_BYTE
pitch = 200
bytealign = 1
name = ./data/textures/tesselation_palette_blue_red.png
width = 300
height = 0
depth = 0
format = IF_RGB
type = IT_UNSIGNED_BYTE
pitch = 900
bytealign = 1
GL_MAX_TESS_EVALUATION_TEXTURE_IMAGE_UNITS: 32
5
задан Velrok 5 July 2011 в 12:48
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