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LibSoftGPU: Add device method for creating images

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Stephan Unverwerth 2021-12-19 00:02:32 +01:00 • committed by Brian Gianforcaro
parent 91ccf9958f
commit b8bb72abbe
5 changed files with 192 additions and 0 deletions
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119
Userland/Libraries/LibSoftGPU/Sampler.cpp Normal file
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/*
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibSoftGPU/Image.h>
#include <LibSoftGPU/Sampler.h>
#include <math.h>
namespace SoftGPU {
constexpr static float fracf(float value)
{
return value - floorf(value);
}
constexpr static float wrap_repeat(float value)
{
return fracf(value);
}
static constexpr float wrap_clamp(float value)
{
return clamp(value, 0.0f, 1.0f);
}
static constexpr float wrap_clamp_to_edge(float value, unsigned num_texels)
{
float const clamp_limit = 1.f / (2 * num_texels);
return clamp(value, clamp_limit, 1.0f - clamp_limit);
}
static constexpr float wrap_mirrored_repeat(float value, unsigned num_texels)
{
float integer = floorf(value);
float frac = value - integer;
bool iseven = fmodf(integer, 2.0f) == 0.0f;
return wrap_clamp_to_edge(iseven ? frac : 1 - frac, num_texels);
}
constexpr static float wrap(float value, TextureWrapMode mode, unsigned num_texels)
{
switch (mode) {
case TextureWrapMode::Repeat:
return wrap_repeat(value);
case TextureWrapMode::MirroredRepeat:
return wrap_mirrored_repeat(value, num_texels);
case TextureWrapMode::Clamp:
return wrap_clamp(value);
case TextureWrapMode::ClampToBorder:
case TextureWrapMode::ClampToEdge:
return wrap_clamp_to_edge(value, num_texels);
default:
VERIFY_NOT_REACHED();
}
}
FloatVector4 Sampler::sample_2d(FloatVector2 const& uv) const
{
if (m_config.bound_image.is_null())
return { 0, 0, 0, 1 };
auto const& image = *m_config.bound_image;
unsigned const layer = 0;
// FIXME: calculate actual mipmap level to use
unsigned const level = 0;
unsigned width = image.level_width(level);
unsigned height = image.level_height(level);
float s = wrap(uv.x(), m_config.texture_wrap_u, width);
float t = wrap(uv.y(), m_config.texture_wrap_v, height);
float u = s * width;
float v = t * height;
if (m_config.texture_mag_filter == TextureFilter::Nearest) {
unsigned i = min(static_cast<unsigned>(u), width - 1);
unsigned j = min(static_cast<unsigned>(v), height - 1);
return image.texel(layer, level, i, j, 0);
}
int i0 = m_config.texture_wrap_u == TextureWrapMode::Repeat ? static_cast<unsigned>(floorf(u - 0.5f)) % width : floorf(u - 0.5f);
int j0 = m_config.texture_wrap_v == TextureWrapMode::Repeat ? static_cast<unsigned>(floorf(v - 0.5f)) % height : floorf(v - 0.5f);
int i1 = m_config.texture_wrap_u == TextureWrapMode::Repeat ? (i0 + 1) % width : i0 + 1;
int j1 = m_config.texture_wrap_v == TextureWrapMode::Repeat ? (j0 + 1) % height : j0 + 1;
FloatVector4 t0, t1, t2, t3;
if (m_config.texture_wrap_u == TextureWrapMode::Repeat && m_config.texture_wrap_v == TextureWrapMode::Repeat) {
t0 = image.texel(layer, level, i0, j0, 0);
t1 = image.texel(layer, level, i1, j0, 0);
t2 = image.texel(layer, level, i0, j1, 0);
t3 = image.texel(layer, level, i1, j1, 0);
} else {
int w = static_cast<int>(width);
int h = static_cast<int>(height);
t0 = (i0 < 0 || i0 >= w || j0 < 0 || j0 >= h) ? m_config.border_color : image.texel(layer, level, i0, j0, 0);
t1 = (i1 < 0 || i1 >= w || j0 < 0 || j0 >= h) ? m_config.border_color : image.texel(layer, level, i1, j0, 0);
t2 = (i0 < 0 || i0 >= w || j1 < 0 || j1 >= h) ? m_config.border_color : image.texel(layer, level, i0, j1, 0);
t3 = (i1 < 0 || i1 >= w || j1 < 0 || j1 >= h) ? m_config.border_color : image.texel(layer, level, i1, j1, 0);
}
float alpha = fracf(u - 0.5f);
float beta = fracf(v - 0.5f);
float one_minus_alpha = 1 - alpha;
float one_minus_beta = 1 - beta;
auto lerp_0 = t0 * one_minus_alpha + t1 * alpha;
auto lerp_1 = t2 * one_minus_alpha + t3 * alpha;
return lerp_0 * one_minus_beta + lerp_1 * beta;
}
}