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added deferred shading foreach_tile

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Evghenii
2013-11-14 16:49:47 +01:00
parent 83b9cc5c0a
commit 599ada8354
2 changed files with 159 additions and 156 deletions
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311
examples_cuda/deferred/kernels1.ispc
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@@ -127,7 +127,7 @@ ComputeZBounds(
// Find Z bounds
float laneMinZ = cameraFar;
float laneMaxZ = cameraNear;
foreach_tiled (y = tileStartY ... tileEndY, x = tileStartX ... tileEndX)
foreach_tiled (y = tileStartY ... tileEndY, x = tileStartX ... tileEndX)
{
// Unproject depth buffer Z value into view space
float z = zBuffer[y * gBufferWidth + x];
@@ -191,7 +191,6 @@ IntersectLightsWithTileMinMax(
foreach (lightIndex = 0 ... numLights)
{
float light_positionView_z = light_positionView_z_array[lightIndex];
float light_attenuationEnd = light_attenuationEnd_array[lightIndex];
float light_attenuationEndNeg = -light_attenuationEnd;
@@ -296,164 +295,164 @@ ShadeTile(
uniform unsigned int8 framebuffer_b[]
)
{
if (tileNumLights == 0 || visualizeLightCount) {
uniform unsigned int8 c = (unsigned int8)(min(tileNumLights << 2, 255));
foreach_tiled (y = tileStartY ... tileEndY, x = tileStartX ... tileEndX)
{
int32 framebufferIndex = (y * gBufferWidth + x);
framebuffer_r[framebufferIndex] = c;
framebuffer_g[framebufferIndex] = c;
framebuffer_b[framebufferIndex] = c;
}
} else {
uniform float twoOverGBufferWidth = 2.0f / gBufferWidth;
uniform float twoOverGBufferHeight = 2.0f / gBufferHeight;
foreach_tiled(y = tileStartY ... tileEndY, x = tileStartX ... tileEndX)
{
float positionScreen_y = -(((0.5f + y) * twoOverGBufferHeight) - 1.f);
int32 gBufferOffset = y * gBufferWidth + x;
// Reconstruct position and (negative) view vector from G-buffer
float surface_positionView_x, surface_positionView_y, surface_positionView_z;
float Vneg_x, Vneg_y, Vneg_z;
float z = inputData.zBuffer[gBufferOffset];
// Compute screen/clip-space position
// NOTE: Mind DX11 viewport transform and pixel center!
float positionScreen_x = (0.5f + (float)(x)) *
twoOverGBufferWidth - 1.0f;
// Unproject depth buffer Z value into view space
surface_positionView_z = cameraProj_43 / (z - cameraProj_33);
surface_positionView_x = positionScreen_x * surface_positionView_z /
cameraProj_11;
surface_positionView_y = positionScreen_y * surface_positionView_z /
cameraProj_22;
// We actually end up with a vector pointing *at* the
// surface (i.e. the negative view vector)
normalize3(surface_positionView_x, surface_positionView_y,
surface_positionView_z, Vneg_x, Vneg_y, Vneg_z);
// Reconstruct normal from G-buffer
float surface_normal_x, surface_normal_y, surface_normal_z;
float normal_x = half_to_float(inputData.normalEncoded_x[gBufferOffset]);
float normal_y = half_to_float(inputData.normalEncoded_y[gBufferOffset]);
float f = (normal_x - normal_x * normal_x) + (normal_y - normal_y * normal_y);
float m = sqrt(4.0f * f - 1.0f);
surface_normal_x = m * (4.0f * normal_x - 2.0f);
surface_normal_y = m * (4.0f * normal_y - 2.0f);
surface_normal_z = 3.0f - 8.0f * f;
// Load other G-buffer parameters
float surface_specularAmount =
half_to_float(inputData.specularAmount[gBufferOffset]);
float surface_specularPower =
half_to_float(inputData.specularPower[gBufferOffset]);
float surface_albedo_x = Unorm8ToFloat32(inputData.albedo_x[gBufferOffset]);
float surface_albedo_y = Unorm8ToFloat32(inputData.albedo_y[gBufferOffset]);
float surface_albedo_z = Unorm8ToFloat32(inputData.albedo_z[gBufferOffset]);
float lit_x = 0.0f;
float lit_y = 0.0f;
float lit_z = 0.0f;
for (uniform int32 tileLightIndex = 0; tileLightIndex < tileNumLights;
++tileLightIndex) {
uniform int32 lightIndex = tileLightIndices[tileLightIndex];
// Gather light data relevant to initial culling
uniform float light_positionView_x =
inputData.lightPositionView_x[lightIndex];
uniform float light_positionView_y =
inputData.lightPositionView_y[lightIndex];
uniform float light_positionView_z =
inputData.lightPositionView_z[lightIndex];
uniform float light_attenuationEnd =
inputData.lightAttenuationEnd[lightIndex];
// Compute light vector
float L_x = light_positionView_x - surface_positionView_x;
float L_y = light_positionView_y - surface_positionView_y;
float L_z = light_positionView_z - surface_positionView_z;
float distanceToLight2 = dot3(L_x, L_y, L_z, L_x, L_y, L_z);
// Clip at end of attenuation
float light_attenutaionEnd2 = light_attenuationEnd * light_attenuationEnd;
cif (distanceToLight2 < light_attenutaionEnd2) {
float distanceToLight = sqrt(distanceToLight2);
// HLSL "rcp" is allowed to be fairly inaccurate
float distanceToLightRcp = rcp(distanceToLight);
L_x *= distanceToLightRcp;
L_y *= distanceToLightRcp;
L_z *= distanceToLightRcp;
// Start computing brdf
float NdotL = dot3(surface_normal_x, surface_normal_y,
surface_normal_z, L_x, L_y, L_z);
// Clip back facing
cif (NdotL > 0.0f) {
uniform float light_attenuationBegin =
inputData.lightAttenuationBegin[lightIndex];
// Light distance attenuation (linstep)
float lightRange = (light_attenuationEnd - light_attenuationBegin);
float falloffPosition = (light_attenuationEnd - distanceToLight);
float attenuation = min(falloffPosition / lightRange, 1.0f);
float H_x = (L_x - Vneg_x);
float H_y = (L_y - Vneg_y);
float H_z = (L_z - Vneg_z);
normalize3(H_x, H_y, H_z, H_x, H_y, H_z);
float NdotH = dot3(surface_normal_x, surface_normal_y,
surface_normal_z, H_x, H_y, H_z);
NdotH = max(NdotH, 0.0f);
float specular = pow(NdotH, surface_specularPower);
float specularNorm = (surface_specularPower + 2.0f) *
(1.0f / 8.0f);
float specularContrib = surface_specularAmount *
specularNorm * specular;
float k = attenuation * NdotL * (1.0f + specularContrib);
uniform float light_color_x = inputData.lightColor_x[lightIndex];
uniform float light_color_y = inputData.lightColor_y[lightIndex];
uniform float light_color_z = inputData.lightColor_z[lightIndex];
float lightContrib_x = surface_albedo_x * light_color_x;
float lightContrib_y = surface_albedo_y * light_color_y;
float lightContrib_z = surface_albedo_z * light_color_z;
lit_x += lightContrib_x * k;
lit_y += lightContrib_y * k;
lit_z += lightContrib_z * k;
}
if (tileNumLights == 0 || visualizeLightCount) {
uniform unsigned int8 c = (unsigned int8)(min(tileNumLights << 2, 255));
foreach_tiled (y = tileStartY ... tileEndY, x = tileStartX ... tileEndX)
{
int32 framebufferIndex = (y * gBufferWidth + x);
framebuffer_r[framebufferIndex] = c;
framebuffer_g[framebufferIndex] = c;
framebuffer_b[framebufferIndex] = c;
}
}
} else {
uniform float twoOverGBufferWidth = 2.0f / gBufferWidth;
uniform float twoOverGBufferHeight = 2.0f / gBufferHeight;
foreach_tiled (y = tileStartY ... tileEndY, x = tileStartX ... tileEndX)
{
float positionScreen_y = -(((0.5f + y) * twoOverGBufferHeight) - 1.f);
int32 gBufferOffset = y * gBufferWidth + x;
// Gamma correct
// These pows are pretty slow right now, but we can do
// something faster if really necessary to squeeze every
// last bit of performance out of it
float gamma = 1.0 / 2.2f;
lit_x = pow(clamp(lit_x, 0.0f, 1.0f), gamma);
lit_y = pow(clamp(lit_y, 0.0f, 1.0f), gamma);
lit_z = pow(clamp(lit_z, 0.0f, 1.0f), gamma);
// Reconstruct position and (negative) view vector from G-buffer
float surface_positionView_x, surface_positionView_y, surface_positionView_z;
float Vneg_x, Vneg_y, Vneg_z;
framebuffer_r[gBufferOffset] = Float32ToUnorm8(lit_x);
framebuffer_g[gBufferOffset] = Float32ToUnorm8(lit_y);
framebuffer_b[gBufferOffset] = Float32ToUnorm8(lit_z);
float z = inputData.zBuffer[gBufferOffset];
// Compute screen/clip-space position
// NOTE: Mind DX11 viewport transform and pixel center!
float positionScreen_x = (0.5f + (float)(x)) *
twoOverGBufferWidth - 1.0f;
// Unproject depth buffer Z value into view space
surface_positionView_z = cameraProj_43 / (z - cameraProj_33);
surface_positionView_x = positionScreen_x * surface_positionView_z /
cameraProj_11;
surface_positionView_y = positionScreen_y * surface_positionView_z /
cameraProj_22;
// We actually end up with a vector pointing *at* the
// surface (i.e. the negative view vector)
normalize3(surface_positionView_x, surface_positionView_y,
surface_positionView_z, Vneg_x, Vneg_y, Vneg_z);
// Reconstruct normal from G-buffer
float surface_normal_x, surface_normal_y, surface_normal_z;
float normal_x = half_to_float(inputData.normalEncoded_x[gBufferOffset]);
float normal_y = half_to_float(inputData.normalEncoded_y[gBufferOffset]);
float f = (normal_x - normal_x * normal_x) + (normal_y - normal_y * normal_y);
float m = sqrt(4.0f * f - 1.0f);
surface_normal_x = m * (4.0f * normal_x - 2.0f);
surface_normal_y = m * (4.0f * normal_y - 2.0f);
surface_normal_z = 3.0f - 8.0f * f;
// Load other G-buffer parameters
float surface_specularAmount =
half_to_float(inputData.specularAmount[gBufferOffset]);
float surface_specularPower =
half_to_float(inputData.specularPower[gBufferOffset]);
float surface_albedo_x = Unorm8ToFloat32(inputData.albedo_x[gBufferOffset]);
float surface_albedo_y = Unorm8ToFloat32(inputData.albedo_y[gBufferOffset]);
float surface_albedo_z = Unorm8ToFloat32(inputData.albedo_z[gBufferOffset]);
float lit_x = 0.0f;
float lit_y = 0.0f;
float lit_z = 0.0f;
for (uniform int32 tileLightIndex = 0; tileLightIndex < tileNumLights;
++tileLightIndex) {
uniform int32 lightIndex = tileLightIndices[tileLightIndex];
// Gather light data relevant to initial culling
uniform float light_positionView_x =
inputData.lightPositionView_x[lightIndex];
uniform float light_positionView_y =
inputData.lightPositionView_y[lightIndex];
uniform float light_positionView_z =
inputData.lightPositionView_z[lightIndex];
uniform float light_attenuationEnd =
inputData.lightAttenuationEnd[lightIndex];
// Compute light vector
float L_x = light_positionView_x - surface_positionView_x;
float L_y = light_positionView_y - surface_positionView_y;
float L_z = light_positionView_z - surface_positionView_z;
float distanceToLight2 = dot3(L_x, L_y, L_z, L_x, L_y, L_z);
// Clip at end of attenuation
float light_attenutaionEnd2 = light_attenuationEnd * light_attenuationEnd;
cif (distanceToLight2 < light_attenutaionEnd2) {
float distanceToLight = sqrt(distanceToLight2);
// HLSL "rcp" is allowed to be fairly inaccurate
float distanceToLightRcp = rcp(distanceToLight);
L_x *= distanceToLightRcp;
L_y *= distanceToLightRcp;
L_z *= distanceToLightRcp;
// Start computing brdf
float NdotL = dot3(surface_normal_x, surface_normal_y,
surface_normal_z, L_x, L_y, L_z);
// Clip back facing
cif (NdotL > 0.0f) {
uniform float light_attenuationBegin =
inputData.lightAttenuationBegin[lightIndex];
// Light distance attenuation (linstep)
float lightRange = (light_attenuationEnd - light_attenuationBegin);
float falloffPosition = (light_attenuationEnd - distanceToLight);
float attenuation = min(falloffPosition / lightRange, 1.0f);
float H_x = (L_x - Vneg_x);
float H_y = (L_y - Vneg_y);
float H_z = (L_z - Vneg_z);
normalize3(H_x, H_y, H_z, H_x, H_y, H_z);
float NdotH = dot3(surface_normal_x, surface_normal_y,
surface_normal_z, H_x, H_y, H_z);
NdotH = max(NdotH, 0.0f);
float specular = pow(NdotH, surface_specularPower);
float specularNorm = (surface_specularPower + 2.0f) *
(1.0f / 8.0f);
float specularContrib = surface_specularAmount *
specularNorm * specular;
float k = attenuation * NdotL * (1.0f + specularContrib);
uniform float light_color_x = inputData.lightColor_x[lightIndex];
uniform float light_color_y = inputData.lightColor_y[lightIndex];
uniform float light_color_z = inputData.lightColor_z[lightIndex];
float lightContrib_x = surface_albedo_x * light_color_x;
float lightContrib_y = surface_albedo_y * light_color_y;
float lightContrib_z = surface_albedo_z * light_color_z;
lit_x += lightContrib_x * k;
lit_y += lightContrib_y * k;
lit_z += lightContrib_z * k;
}
}
}
// Gamma correct
// These pows are pretty slow right now, but we can do
// something faster if really necessary to squeeze every
// last bit of performance out of it
float gamma = 1.0 / 2.2f;
lit_x = pow(clamp(lit_x, 0.0f, 1.0f), gamma);
lit_y = pow(clamp(lit_y, 0.0f, 1.0f), gamma);
lit_z = pow(clamp(lit_z, 0.0f, 1.0f), gamma);
framebuffer_r[gBufferOffset] = Float32ToUnorm8(lit_x);
framebuffer_g[gBufferOffset] = Float32ToUnorm8(lit_y);
framebuffer_b[gBufferOffset] = Float32ToUnorm8(lit_z);
}
}
}
}

4
examples_cuda/deferred/main_cu.cpp
View File

@@ -116,6 +116,10 @@ void createContext(const int deviceId = 0)
// Create driver context
checkCudaErrors(cuCtxCreate(&context, 0, device));
const size_t stackLimit = 4*1024;
// const size_t heapLimit = 1024*1024*1024;
checkCudaErrors(cuCtxSetLimit(CU_LIMIT_STACK_SIZE,stackLimit));
// checkCudaErrors(cuCtxSetLimit(CU_LIMIT_MALLOC_HEAP_SIZE,heapLimit));
}
void destroyContext()
{