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migra postfx a aee_arcade i elimina supersampling/downsampling

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This commit is contained in:
Sergio Valor
2026-05-17 11:05:06 +02:00
parent 11eec8f222
commit bd5683d498
28 changed files with 3374 additions and 8026 deletions
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source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp
+43 -691
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@@ -2,349 +2,22 @@
#include <SDL3/SDL_log.h>
#include <algorithm> // std::min, std::max, std::floor
#include <cmath> // std::floor, std::ceil
#include <algorithm> // std::min, std::max
#include <cmath> // std::floor
#include <cstring> // memcpy, strlen
#include <iostream> // Para std::cout
#ifndef __APPLE__
#include "core/rendering/sdl3gpu/spv/crtpi_frag_spv.h"
#include "core/rendering/sdl3gpu/spv/downscale_frag_spv.h"
#include "core/rendering/sdl3gpu/spv/postfx_frag_spv.h"
#include "core/rendering/sdl3gpu/spv/postfx_vert_spv.h"
#include "core/rendering/sdl3gpu/spv/upscale_frag_spv.h"
#endif
#ifdef __APPLE__
// ============================================================================
// MSL shaders (Metal Shading Language) — macOS
// ============================================================================
// NOLINTBEGIN(readability-identifier-naming)
static const char* POSTFX_VERT_MSL = R"(
#include <metal_stdlib>
using namespace metal;
struct PostVOut {
float4 pos [[position]];
float2 uv;
};
vertex PostVOut postfx_vs(uint vid [[vertex_id]]) {
const float2 positions[3] = { {-1.0, -1.0}, {3.0, -1.0}, {-1.0, 3.0} };
const float2 uvs[3] = { { 0.0, 1.0}, {2.0, 1.0}, { 0.0,-1.0} };
PostVOut out;
out.pos = float4(positions[vid], 0.0, 1.0);
out.uv = uvs[vid];
return out;
}
)";
static const char* POSTFX_FRAG_MSL = R"(
#include <metal_stdlib>
using namespace metal;
struct PostVOut {
float4 pos [[position]];
float2 uv;
};
struct PostFXUniforms {
float vignette_strength;
float chroma_strength;
float scanline_strength;
float screen_height;
float mask_strength;
float gamma_strength;
float curvature;
float bleeding;
float pixel_scale;
float time;
float oversample;
float flicker;
};
static float3 rgb_to_ycc(float3 rgb) {
return float3(
0.299f*rgb.r + 0.587f*rgb.g + 0.114f*rgb.b,
-0.169f*rgb.r - 0.331f*rgb.g + 0.500f*rgb.b + 0.5f,
0.500f*rgb.r - 0.419f*rgb.g - 0.081f*rgb.b + 0.5f
);
}
static float3 ycc_to_rgb(float3 ycc) {
float y = ycc.x;
float cb = ycc.y - 0.5f;
float cr = ycc.z - 0.5f;
return clamp(float3(
y + 1.402f*cr,
y - 0.344f*cb - 0.714f*cr,
y + 1.772f*cb
), 0.0f, 1.0f);
}
fragment float4 postfx_fs(PostVOut in [[stage_in]],
texture2d<float> scene [[texture(0)]],
sampler samp [[sampler(0)]],
constant PostFXUniforms& u [[buffer(0)]]) {
float2 uv = in.uv;
if (u.curvature > 0.0f) {
float2 c = uv - 0.5f;
float rsq = dot(c, c);
float2 dist = float2(0.05f, 0.1f) * u.curvature;
float2 barrelScale = 1.0f - 0.23f * dist;
c += c * (dist * rsq);
c *= barrelScale;
if (abs(c.x) >= 0.5f || abs(c.y) >= 0.5f) {
return float4(0.0f, 0.0f, 0.0f, 1.0f);
}
uv = c + 0.5f;
}
float3 base = scene.sample(samp, uv).rgb;
float3 colour;
if (u.bleeding > 0.0f) {
float tw = float(scene.get_width());
float step = u.oversample / tw;
float3 ycc = rgb_to_ycc(base);
float3 ycc_l2 = rgb_to_ycc(scene.sample(samp, uv - float2(2.0f*step, 0.0f)).rgb);
float3 ycc_l1 = rgb_to_ycc(scene.sample(samp, uv - float2(1.0f*step, 0.0f)).rgb);
float3 ycc_r1 = rgb_to_ycc(scene.sample(samp, uv + float2(1.0f*step, 0.0f)).rgb);
float3 ycc_r2 = rgb_to_ycc(scene.sample(samp, uv + float2(2.0f*step, 0.0f)).rgb);
ycc.yz = (ycc_l2.yz + ycc_l1.yz*2.0f + ycc.yz*2.0f + ycc_r1.yz*2.0f + ycc_r2.yz) / 8.0f;
colour = mix(base, ycc_to_rgb(ycc), u.bleeding);
} else {
colour = base;
}
float ca = u.chroma_strength * 0.005f * (1.0f + 0.15f * sin(u.time * 7.3f));
colour.r = scene.sample(samp, uv + float2(ca, 0.0f)).r;
colour.b = scene.sample(samp, uv - float2(ca, 0.0f)).b;
if (u.gamma_strength > 0.0f) {
float3 lin = pow(colour, float3(2.4f));
colour = mix(colour, lin, u.gamma_strength);
}
const float SCAN_DARK_RATIO = 0.333f;
const float SCAN_DARK_FLOOR = 0.42f;
if (u.scanline_strength > 0.0f) {
float ps = max(1.0f, round(u.pixel_scale));
float frac_in_row = fract(uv.y * u.screen_height);
float row_pos = floor(frac_in_row * ps);
float bright_rows = (ps < 2.0f) ? ps : ((ps < 3.0f) ? 1.0f : floor(ps * (1.0f - SCAN_DARK_RATIO)));
float is_dark = step(bright_rows, row_pos);
float scan = mix(1.0f, SCAN_DARK_FLOOR, is_dark);
colour *= mix(1.0f, scan, u.scanline_strength);
}
if (u.gamma_strength > 0.0f) {
float3 enc = pow(colour, float3(1.0f/2.2f));
colour = mix(colour, enc, u.gamma_strength);
}
float2 d = uv - 0.5f;
float vignette = 1.0f - dot(d, d) * u.vignette_strength;
colour *= clamp(vignette, 0.0f, 1.0f);
if (u.mask_strength > 0.0f) {
float whichMask = fract(in.pos.x * 0.3333333f);
float3 mask = float3(0.80f);
if (whichMask < 0.3333333f) mask.x = 1.0f;
else if (whichMask < 0.6666667f) mask.y = 1.0f;
else mask.z = 1.0f;
colour = mix(colour, colour * mask, u.mask_strength);
}
if (u.flicker > 0.0f) {
float flicker_wave = sin(u.time * 100.0f) * 0.5f + 0.5f;
colour *= 1.0f - u.flicker * 0.04f * flicker_wave;
}
return float4(colour, 1.0f);
}
)";
static const char* UPSCALE_FRAG_MSL = R"(
#include <metal_stdlib>
using namespace metal;
struct VertOut { float4 pos [[position]]; float2 uv; };
fragment float4 upscale_fs(VertOut in [[stage_in]],
texture2d<float> scene [[texture(0)]],
sampler smp [[sampler(0)]])
{
return scene.sample(smp, in.uv);
}
)";
static const char* DOWNSCALE_FRAG_MSL = R"(
#include <metal_stdlib>
using namespace metal;
struct VertOut { float4 pos [[position]]; float2 uv; };
struct DownscaleUniforms { int algorithm; float pad0; float pad1; float pad2; };
static float lanczos_w(float t, float a) {
t = abs(t);
if (t < 0.0001f) { return 1.0f; }
if (t >= a) { return 0.0f; }
const float PI = 3.14159265358979f;
float pt = PI * t;
return (a * sin(pt) * sin(pt / a)) / (pt * pt);
}
fragment float4 downscale_fs(VertOut in [[stage_in]],
texture2d<float> source [[texture(0)]],
sampler smp [[sampler(0)]],
constant DownscaleUniforms& u [[buffer(0)]])
{
float2 src_size = float2(source.get_width(), source.get_height());
float2 p = in.uv * src_size;
float2 p_floor = floor(p);
float a = (u.algorithm == 0) ? 2.0f : 3.0f;
int win = int(a);
float4 color = float4(0.0f);
float weight_sum = 0.0f;
for (int j = -win; j <= win; j++) {
for (int i = -win; i <= win; i++) {
float2 tap_center = p_floor + float2(float(i), float(j)) + 0.5f;
float2 offset = tap_center - p;
float w = lanczos_w(offset.x, a) * lanczos_w(offset.y, a);
color += source.sample(smp, tap_center / src_size) * w;
weight_sum += w;
}
}
return (weight_sum > 0.0f) ? (color / weight_sum) : float4(0.0f, 0.0f, 0.0f, 1.0f);
}
)";
static const char* CRTPI_FRAG_MSL = R"(
#include <metal_stdlib>
using namespace metal;
struct PostVOut {
float4 pos [[position]];
float2 uv;
};
struct CrtPiUniforms {
float scanline_weight;
float scanline_gap_brightness;
float bloom_factor;
float input_gamma;
float output_gamma;
float mask_brightness;
float curvature_x;
float curvature_y;
int mask_type;
int enable_scanlines;
int enable_multisample;
int enable_gamma;
int enable_curvature;
int enable_sharper;
float texture_width;
float texture_height;
};
static float2 crtpi_distort(float2 coord, float2 screen_scale, float cx, float cy) {
float2 curvature = float2(cx, cy);
float2 barrel_scale = 1.0f - (0.23f * curvature);
coord *= screen_scale;
coord -= 0.5f;
float rsq = coord.x * coord.x + coord.y * coord.y;
coord += coord * (curvature * rsq);
coord *= barrel_scale;
if (abs(coord.x) >= 0.5f || abs(coord.y) >= 0.5f) { return float2(-1.0f); }
coord += 0.5f;
coord /= screen_scale;
return coord;
}
static float crtpi_scan_weight(float dist, float sw, float gap) {
return max(1.0f - dist * dist * sw, gap);
}
static float crtpi_scan_line(float dy, float filter_w, float sw, float gap, bool ms) {
float w = crtpi_scan_weight(dy, sw, gap);
if (ms) {
w += crtpi_scan_weight(dy - filter_w, sw, gap);
w += crtpi_scan_weight(dy + filter_w, sw, gap);
w *= 0.3333333f;
}
return w;
}
fragment float4 crtpi_fs(PostVOut in [[stage_in]],
texture2d<float> tex [[texture(0)]],
sampler samp [[sampler(0)]],
constant CrtPiUniforms& u [[buffer(0)]]) {
float2 tex_size = float2(u.texture_width, u.texture_height);
float filter_width = (768.0f / u.texture_height) / 3.0f;
float2 texcoord = in.uv;
if (u.enable_curvature != 0) {
texcoord = crtpi_distort(texcoord, float2(1.0f, 1.0f), u.curvature_x, u.curvature_y);
if (texcoord.x < 0.0f) { return float4(0.0f, 0.0f, 0.0f, 1.0f); }
}
float2 coord_in_pixels = texcoord * tex_size;
float2 tc;
float scan_weight;
if (u.enable_sharper != 0) {
float2 temp = floor(coord_in_pixels) + 0.5f;
tc = temp / tex_size;
float2 deltas = coord_in_pixels - temp;
scan_weight = crtpi_scan_line(deltas.y, filter_width, u.scanline_weight, u.scanline_gap_brightness, u.enable_multisample != 0);
float2 signs = sign(deltas);
deltas.x *= 2.0f;
deltas = deltas * deltas;
deltas.y = deltas.y * deltas.y;
deltas.x *= 0.5f;
deltas.y *= 8.0f;
deltas /= tex_size;
deltas *= signs;
tc = tc + deltas;
} else {
float temp_y = floor(coord_in_pixels.y) + 0.5f;
float y_coord = temp_y / tex_size.y;
float dy = coord_in_pixels.y - temp_y;
scan_weight = crtpi_scan_line(dy, filter_width, u.scanline_weight, u.scanline_gap_brightness, u.enable_multisample != 0);
float sign_y = sign(dy);
dy = dy * dy;
dy = dy * dy;
dy *= 8.0f;
dy /= tex_size.y;
dy *= sign_y;
tc = float2(texcoord.x, y_coord + dy);
}
float3 colour = tex.sample(samp, tc).rgb;
if (u.enable_scanlines != 0) {
if (u.enable_gamma != 0) { colour = pow(colour, float3(u.input_gamma)); }
colour *= scan_weight * u.bloom_factor;
if (u.enable_gamma != 0) { colour = pow(colour, float3(1.0f / u.output_gamma)); }
}
if (u.mask_type == 1) {
float wm = fract(in.pos.x * 0.5f);
float3 mask = (wm < 0.5f) ? float3(u.mask_brightness, 1.0f, u.mask_brightness)
: float3(1.0f, u.mask_brightness, 1.0f);
colour *= mask;
} else if (u.mask_type == 2) {
float wm = fract(in.pos.x * 0.3333333f);
float3 mask = float3(u.mask_brightness);
if (wm < 0.3333333f) mask.x = 1.0f;
else if (wm < 0.6666666f) mask.y = 1.0f;
else mask.z = 1.0f;
colour *= mask;
}
return float4(colour, 1.0f);
}
)";
// NOLINTEND(readability-identifier-naming)
#endif // __APPLE__
#include "core/rendering/sdl3gpu/msl/crtpi_frag.msl.h"
#include "core/rendering/sdl3gpu/msl/postfx_frag.msl.h"
#include "core/rendering/sdl3gpu/msl/postfx_vert.msl.h"
#endif
namespace Rendering {
@@ -374,7 +47,6 @@ namespace Rendering {
game_width_ = static_cast<int>(fw);
game_height_ = static_cast<int>(fh);
uniforms_.screen_height = static_cast<float>(game_height_);
uniforms_.oversample = static_cast<float>(oversample_);
// 1. GPU disabled by config
if (preferred_driver_ == "none") {
@@ -412,7 +84,7 @@ namespace Rendering {
SDL_SetGPUSwapchainParameters(device_, window_, SDL_GPU_SWAPCHAINCOMPOSITION_SDR, bestPresentMode(vsync_));
}
// 3. Create scene texture (always game resolution)
// 3. Create scene texture (game resolution)
SDL_GPUTextureCreateInfo tex_info = {};
tex_info.type = SDL_GPU_TEXTURETYPE_2D;
tex_info.format = SDL_GPU_TEXTUREFORMAT_B8G8R8A8_UNORM;
@@ -428,9 +100,7 @@ namespace Rendering {
return false;
}
ss_factor_ = 0;
// 4. Create upload transfer buffer (always game resolution)
// 4. Create upload transfer buffer (game resolution)
SDL_GPUTransferBufferCreateInfo tb_info = {};
tb_info.usage = SDL_GPU_TRANSFERBUFFERUSAGE_UPLOAD;
tb_info.size = static_cast<Uint32>(game_width_ * game_height_ * 4);
@@ -441,7 +111,7 @@ namespace Rendering {
return false;
}
// 5. Create samplers
// 5. Create nearest sampler
SDL_GPUSamplerCreateInfo samp_info = {};
samp_info.min_filter = SDL_GPU_FILTER_NEAREST;
samp_info.mag_filter = SDL_GPU_FILTER_NEAREST;
@@ -456,20 +126,6 @@ namespace Rendering {
return false;
}
SDL_GPUSamplerCreateInfo lsamp_info = {};
lsamp_info.min_filter = SDL_GPU_FILTER_LINEAR;
lsamp_info.mag_filter = SDL_GPU_FILTER_LINEAR;
lsamp_info.mipmap_mode = SDL_GPU_SAMPLERMIPMAPMODE_NEAREST;
lsamp_info.address_mode_u = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
lsamp_info.address_mode_v = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
lsamp_info.address_mode_w = SDL_GPU_SAMPLERADDRESSMODE_CLAMP_TO_EDGE;
linear_sampler_ = SDL_CreateGPUSampler(device_, &lsamp_info);
if (linear_sampler_ == nullptr) {
std::cout << "SDL3GPUShader: failed to create linear sampler: " << SDL_GetError() << '\n';
cleanup();
return false;
}
// 6. Create pipelines
if (!createPipeline()) {
cleanup();
@@ -486,15 +142,14 @@ namespace Rendering {
}
// ---------------------------------------------------------------------------
// createPipeline — PostFX + Upscale + PostFX offscreen + Downscale pipelines
// createPipeline — PostFX → swapchain
// ---------------------------------------------------------------------------
auto SDL3GPUShader::createPipeline() -> bool { // NOLINT(readability-function-cognitive-complexity)
auto SDL3GPUShader::createPipeline() -> bool {
const SDL_GPUTextureFormat SWAPCHAIN_FMT = SDL_GetGPUSwapchainTextureFormat(device_, window_);
// ---- PostFX pipeline (→ swapchain) ----
#ifdef __APPLE__
SDL_GPUShader* vert = createShaderMSL(device_, POSTFX_VERT_MSL, "postfx_vs", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* frag = createShaderMSL(device_, POSTFX_FRAG_MSL, "postfx_fs", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
SDL_GPUShader* vert = createShaderMSL(device_, Msl::kPostfxVert, "postfx_vs", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* frag = createShaderMSL(device_, Msl::kPostfxFrag, "postfx_fs", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
#else
SDL_GPUShader* vert = createShaderSPIRV(device_, kpostfx_vert_spv, kpostfx_vert_spv_size, "main", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* frag = createShaderSPIRV(device_, kpostfx_frag_spv, kpostfx_frag_spv_size, "main", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
@@ -534,114 +189,6 @@ namespace Rendering {
return false;
}
// ---- Upscale pipeline (scene → scaled_texture_) ----
#ifdef __APPLE__
SDL_GPUShader* uvert = createShaderMSL(device_, POSTFX_VERT_MSL, "postfx_vs", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* ufrag = createShaderMSL(device_, UPSCALE_FRAG_MSL, "upscale_fs", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 0);
#else
SDL_GPUShader* uvert = createShaderSPIRV(device_, kpostfx_vert_spv, kpostfx_vert_spv_size, "main", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* ufrag = createShaderSPIRV(device_, kupscale_frag_spv, kupscale_frag_spv_size, "main", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 0);
#endif
if ((uvert == nullptr) || (ufrag == nullptr)) {
if (uvert != nullptr) { SDL_ReleaseGPUShader(device_, uvert); }
if (ufrag != nullptr) { SDL_ReleaseGPUShader(device_, ufrag); }
return false;
}
SDL_GPUColorTargetDescription upscale_ct = {};
upscale_ct.format = SDL_GPU_TEXTUREFORMAT_B8G8R8A8_UNORM;
upscale_ct.blend_state = no_blend;
SDL_GPUGraphicsPipelineCreateInfo upscale_pi = {};
upscale_pi.vertex_shader = uvert;
upscale_pi.fragment_shader = ufrag;
upscale_pi.vertex_input_state = no_input;
upscale_pi.primitive_type = SDL_GPU_PRIMITIVETYPE_TRIANGLELIST;
upscale_pi.target_info.num_color_targets = 1;
upscale_pi.target_info.color_target_descriptions = &upscale_ct;
upscale_pipeline_ = SDL_CreateGPUGraphicsPipeline(device_, &upscale_pi);
SDL_ReleaseGPUShader(device_, uvert);
SDL_ReleaseGPUShader(device_, ufrag);
if (upscale_pipeline_ == nullptr) {
std::cout << "SDL3GPUShader: upscale pipeline creation failed: " << SDL_GetError() << '\n';
return false;
}
// ---- PostFX offscreen pipeline (→ B8G8R8A8 texture, for Lanczos path) ----
#ifdef __APPLE__
SDL_GPUShader* ofvert = createShaderMSL(device_, POSTFX_VERT_MSL, "postfx_vs", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* offrag = createShaderMSL(device_, POSTFX_FRAG_MSL, "postfx_fs", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
#else
SDL_GPUShader* ofvert = createShaderSPIRV(device_, kpostfx_vert_spv, kpostfx_vert_spv_size, "main", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* offrag = createShaderSPIRV(device_, kpostfx_frag_spv, kpostfx_frag_spv_size, "main", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
#endif
if ((ofvert == nullptr) || (offrag == nullptr)) {
if (ofvert != nullptr) { SDL_ReleaseGPUShader(device_, ofvert); }
if (offrag != nullptr) { SDL_ReleaseGPUShader(device_, offrag); }
return false;
}
SDL_GPUColorTargetDescription offscreen_ct = {};
offscreen_ct.format = SDL_GPU_TEXTUREFORMAT_B8G8R8A8_UNORM;
offscreen_ct.blend_state = no_blend;
SDL_GPUGraphicsPipelineCreateInfo offscreen_pi = {};
offscreen_pi.vertex_shader = ofvert;
offscreen_pi.fragment_shader = offrag;
offscreen_pi.vertex_input_state = no_input;
offscreen_pi.primitive_type = SDL_GPU_PRIMITIVETYPE_TRIANGLELIST;
offscreen_pi.target_info.num_color_targets = 1;
offscreen_pi.target_info.color_target_descriptions = &offscreen_ct;
postfx_offscreen_pipeline_ = SDL_CreateGPUGraphicsPipeline(device_, &offscreen_pi);
SDL_ReleaseGPUShader(device_, ofvert);
SDL_ReleaseGPUShader(device_, offrag);
if (postfx_offscreen_pipeline_ == nullptr) {
std::cout << "SDL3GPUShader: PostFX offscreen pipeline creation failed: " << SDL_GetError() << '\n';
return false;
}
// ---- Downscale pipeline (Lanczos → swapchain) ----
#ifdef __APPLE__
SDL_GPUShader* dvert = createShaderMSL(device_, POSTFX_VERT_MSL, "postfx_vs", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* dfrag = createShaderMSL(device_, DOWNSCALE_FRAG_MSL, "downscale_fs", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
#else
SDL_GPUShader* dvert = createShaderSPIRV(device_, kpostfx_vert_spv, kpostfx_vert_spv_size, "main", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* dfrag = createShaderSPIRV(device_, kdownscale_frag_spv, kdownscale_frag_spv_size, "main", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
#endif
if ((dvert == nullptr) || (dfrag == nullptr)) {
if (dvert != nullptr) { SDL_ReleaseGPUShader(device_, dvert); }
if (dfrag != nullptr) { SDL_ReleaseGPUShader(device_, dfrag); }
return false;
}
SDL_GPUColorTargetDescription downscale_ct = {};
downscale_ct.format = SWAPCHAIN_FMT;
downscale_ct.blend_state = no_blend;
SDL_GPUGraphicsPipelineCreateInfo downscale_pi = {};
downscale_pi.vertex_shader = dvert;
downscale_pi.fragment_shader = dfrag;
downscale_pi.vertex_input_state = no_input;
downscale_pi.primitive_type = SDL_GPU_PRIMITIVETYPE_TRIANGLELIST;
downscale_pi.target_info.num_color_targets = 1;
downscale_pi.target_info.color_target_descriptions = &downscale_ct;
downscale_pipeline_ = SDL_CreateGPUGraphicsPipeline(device_, &downscale_pi);
SDL_ReleaseGPUShader(device_, dvert);
SDL_ReleaseGPUShader(device_, dfrag);
if (downscale_pipeline_ == nullptr) {
std::cout << "SDL3GPUShader: downscale pipeline creation failed: " << SDL_GetError() << '\n';
return false;
}
return true;
}
@@ -652,8 +199,8 @@ namespace Rendering {
const SDL_GPUTextureFormat SWAPCHAIN_FMT = SDL_GetGPUSwapchainTextureFormat(device_, window_);
#ifdef __APPLE__
SDL_GPUShader* vert = createShaderMSL(device_, POSTFX_VERT_MSL, "postfx_vs", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* frag = createShaderMSL(device_, CRTPI_FRAG_MSL, "crtpi_fs", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
SDL_GPUShader* vert = createShaderMSL(device_, Msl::kPostfxVert, "postfx_vs", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* frag = createShaderMSL(device_, Msl::kCrtpiFrag, "crtpi_fs", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
#else
SDL_GPUShader* vert = createShaderSPIRV(device_, kpostfx_vert_spv, kpostfx_vert_spv_size, "main", SDL_GPU_SHADERSTAGE_VERTEX, 0, 0);
SDL_GPUShader* frag = createShaderSPIRV(device_, kcrtpi_frag_spv, kcrtpi_frag_spv_size, "main", SDL_GPU_SHADERSTAGE_FRAGMENT, 1, 1);
@@ -691,7 +238,7 @@ namespace Rendering {
}
// ---------------------------------------------------------------------------
// uploadPixels — direct memcpy, GPU handles upscale
// uploadPixels — direct memcpy
// ---------------------------------------------------------------------------
void SDL3GPUShader::uploadPixels(const Uint32* pixels, int width, int height) {
if (!is_initialized_ || (upload_buffer_ == nullptr)) { return; }
@@ -707,24 +254,11 @@ namespace Rendering {
}
// ---------------------------------------------------------------------------
// render — 3-path: CrtPi direct, PostFX+Lanczos, PostFX direct
// render — CrtPi direct OR PostFX direct → swapchain
// ---------------------------------------------------------------------------
void SDL3GPUShader::render() { // NOLINT(readability-function-cognitive-complexity)
void SDL3GPUShader::render() {
if (!is_initialized_) { return; }
// SS factor calculation
if (oversample_ > 1 && game_height_ > 0) {
int win_w = 0;
int win_h = 0;
SDL_GetWindowSizeInPixels(window_, &win_w, &win_h);
const float ZOOM = static_cast<float>(win_h) / static_cast<float>(game_height_);
const int NEED_FACTOR = calcSsFactor(ZOOM);
if (NEED_FACTOR != ss_factor_) {
SDL_WaitForGPUIdle(device_);
recreateScaledTexture(NEED_FACTOR);
}
}
SDL_GPUCommandBuffer* cmd = SDL_AcquireGPUCommandBuffer(device_);
if (cmd == nullptr) {
std::cout << "SDL3GPUShader: SDL_AcquireGPUCommandBuffer failed: " << SDL_GetError() << '\n';
@@ -750,25 +284,6 @@ namespace Rendering {
SDL_EndGPUCopyPass(copy);
}
// ---- Upscale pass: scene → scaled_texture_ ----
if (oversample_ > 1 && scaled_texture_ != nullptr && upscale_pipeline_ != nullptr) {
SDL_GPUColorTargetInfo upscale_target = {};
upscale_target.texture = scaled_texture_;
upscale_target.load_op = SDL_GPU_LOADOP_DONT_CARE;
upscale_target.store_op = SDL_GPU_STOREOP_STORE;
SDL_GPURenderPass* upass = SDL_BeginGPURenderPass(cmd, &upscale_target, 1, nullptr);
if (upass != nullptr) {
SDL_BindGPUGraphicsPipeline(upass, upscale_pipeline_);
SDL_GPUTextureSamplerBinding ubinding = {};
ubinding.texture = scene_texture_;
ubinding.sampler = (linear_upscale_ && linear_sampler_ != nullptr) ? linear_sampler_ : sampler_;
SDL_BindGPUFragmentSamplers(upass, 0, &ubinding, 1);
SDL_DrawGPUPrimitives(upass, 3, 1, 0, 0);
SDL_EndGPURenderPass(upass);
}
}
// ---- Acquire swapchain texture ----
SDL_GPUTexture* swapchain = nullptr;
Uint32 sw = 0;
@@ -802,117 +317,37 @@ namespace Rendering {
vx = std::floor((static_cast<float>(sw) - vw) * 0.5F);
vy = std::floor((static_cast<float>(sh) - vh) * 0.5F);
if (oversample_ > 1 && ss_factor_ > 0) {
uniforms_.pixel_scale = static_cast<float>(ss_factor_);
} else {
uniforms_.pixel_scale = (game_height_ > 0) ? (vh / static_cast<float>(game_height_)) : 1.0F;
}
uniforms_.pixel_scale = (game_height_ > 0) ? (vh / static_cast<float>(game_height_)) : 1.0F;
uniforms_.time = static_cast<float>(SDL_GetTicks()) / 1000.0F;
uniforms_.oversample = (oversample_ > 1 && ss_factor_ > 0)
? static_cast<float>(ss_factor_)
: 1.0F;
// ---- Path A: CrtPi direct ----
if (active_shader_ == ShaderType::CRTPI && crtpi_pipeline_ != nullptr) {
SDL_GPUColorTargetInfo ct = {};
ct.texture = swapchain;
ct.load_op = SDL_GPU_LOADOP_CLEAR;
ct.store_op = SDL_GPU_STOREOP_STORE;
ct.clear_color = {.r = 0.0F, .g = 0.0F, .b = 0.0F, .a = 1.0F};
SDL_GPUColorTargetInfo ct = {};
ct.texture = swapchain;
ct.load_op = SDL_GPU_LOADOP_CLEAR;
ct.store_op = SDL_GPU_STOREOP_STORE;
ct.clear_color = {.r = 0.0F, .g = 0.0F, .b = 0.0F, .a = 1.0F};
SDL_GPURenderPass* pass = SDL_BeginGPURenderPass(cmd, &ct, 1, nullptr);
if (pass != nullptr) {
SDL_GPURenderPass* pass = SDL_BeginGPURenderPass(cmd, &ct, 1, nullptr);
if (pass != nullptr) {
SDL_GPUViewport vp = {.x = vx, .y = vy, .w = vw, .h = vh, .min_depth = 0.0F, .max_depth = 1.0F};
SDL_SetGPUViewport(pass, &vp);
SDL_GPUTextureSamplerBinding binding = {};
binding.texture = scene_texture_;
binding.sampler = sampler_;
SDL_BindGPUFragmentSamplers(pass, 0, &binding, 1);
if (active_shader_ == ShaderType::CRTPI && crtpi_pipeline_ != nullptr) {
SDL_BindGPUGraphicsPipeline(pass, crtpi_pipeline_);
SDL_GPUViewport vp = {.x = vx, .y = vy, .w = vw, .h = vh, .min_depth = 0.0F, .max_depth = 1.0F};
SDL_SetGPUViewport(pass, &vp);
SDL_GPUTextureSamplerBinding binding = {};
binding.texture = scene_texture_;
binding.sampler = sampler_;
SDL_BindGPUFragmentSamplers(pass, 0, &binding, 1);
crtpi_uniforms_.texture_width = static_cast<float>(game_width_);
crtpi_uniforms_.texture_height = static_cast<float>(game_height_);
SDL_PushGPUFragmentUniformData(cmd, 0, &crtpi_uniforms_, sizeof(CrtPiUniforms));
SDL_DrawGPUPrimitives(pass, 3, 1, 0, 0);
SDL_EndGPURenderPass(pass);
}
SDL_SubmitGPUCommandBuffer(cmd);
return;
}
// ---- Path B: PostFX + Lanczos (SS active + algo selected) ----
const bool USE_LANCZOS = (oversample_ > 1 && downscale_algo_ > 0 && scaled_texture_ != nullptr && postfx_texture_ != nullptr && postfx_offscreen_pipeline_ != nullptr && downscale_pipeline_ != nullptr);
if (USE_LANCZOS) {
// Pass B1: PostFX → postfx_texture_
SDL_GPUColorTargetInfo postfx_ct = {};
postfx_ct.texture = postfx_texture_;
postfx_ct.load_op = SDL_GPU_LOADOP_CLEAR;
postfx_ct.store_op = SDL_GPU_STOREOP_STORE;
postfx_ct.clear_color = {.r = 0.0F, .g = 0.0F, .b = 0.0F, .a = 1.0F};
SDL_GPURenderPass* ppass = SDL_BeginGPURenderPass(cmd, &postfx_ct, 1, nullptr);
if (ppass != nullptr) {
SDL_BindGPUGraphicsPipeline(ppass, postfx_offscreen_pipeline_);
SDL_GPUTextureSamplerBinding pbinding = {};
pbinding.texture = scaled_texture_;
pbinding.sampler = sampler_;
SDL_BindGPUFragmentSamplers(ppass, 0, &pbinding, 1);
SDL_PushGPUFragmentUniformData(cmd, 0, &uniforms_, sizeof(PostFXUniforms));
SDL_DrawGPUPrimitives(ppass, 3, 1, 0, 0);
SDL_EndGPURenderPass(ppass);
}
// Pass B2: Lanczos downscale → swapchain
SDL_GPUColorTargetInfo ds_ct = {};
ds_ct.texture = swapchain;
ds_ct.load_op = SDL_GPU_LOADOP_CLEAR;
ds_ct.store_op = SDL_GPU_STOREOP_STORE;
ds_ct.clear_color = {.r = 0.0F, .g = 0.0F, .b = 0.0F, .a = 1.0F};
SDL_GPURenderPass* dpass = SDL_BeginGPURenderPass(cmd, &ds_ct, 1, nullptr);
if (dpass != nullptr) {
SDL_BindGPUGraphicsPipeline(dpass, downscale_pipeline_);
SDL_GPUViewport vp = {.x = vx, .y = vy, .w = vw, .h = vh, .min_depth = 0.0F, .max_depth = 1.0F};
SDL_SetGPUViewport(dpass, &vp);
SDL_GPUTextureSamplerBinding dbinding = {};
dbinding.texture = postfx_texture_;
dbinding.sampler = sampler_;
SDL_BindGPUFragmentSamplers(dpass, 0, &dbinding, 1);
DownscaleUniforms du = {.algorithm = downscale_algo_ - 1, .pad0 = 0.0F, .pad1 = 0.0F, .pad2 = 0.0F};
SDL_PushGPUFragmentUniformData(cmd, 0, &du, sizeof(DownscaleUniforms));
SDL_DrawGPUPrimitives(dpass, 3, 1, 0, 0);
SDL_EndGPURenderPass(dpass);
}
} else {
// ---- Path C: PostFX direct → swapchain ----
SDL_GPUColorTargetInfo ct = {};
ct.texture = swapchain;
ct.load_op = SDL_GPU_LOADOP_CLEAR;
ct.store_op = SDL_GPU_STOREOP_STORE;
ct.clear_color = {.r = 0.0F, .g = 0.0F, .b = 0.0F, .a = 1.0F};
SDL_GPURenderPass* pass = SDL_BeginGPURenderPass(cmd, &ct, 1, nullptr);
if (pass != nullptr) {
} else {
SDL_BindGPUGraphicsPipeline(pass, pipeline_);
SDL_GPUViewport vp = {.x = vx, .y = vy, .w = vw, .h = vh, .min_depth = 0.0F, .max_depth = 1.0F};
SDL_SetGPUViewport(pass, &vp);
SDL_GPUTexture* input_texture = (oversample_ > 1 && scaled_texture_ != nullptr) ? scaled_texture_ : scene_texture_;
SDL_GPUSampler* active_sampler = (oversample_ > 1 && linear_sampler_ != nullptr) ? linear_sampler_ : sampler_;
SDL_GPUTextureSamplerBinding binding = {};
binding.texture = input_texture;
binding.sampler = active_sampler;
SDL_BindGPUFragmentSamplers(pass, 0, &binding, 1);
SDL_PushGPUFragmentUniformData(cmd, 0, &uniforms_, sizeof(PostFXUniforms));
SDL_DrawGPUPrimitives(pass, 3, 1, 0, 0);
SDL_EndGPURenderPass(pass);
}
SDL_DrawGPUPrimitives(pass, 3, 1, 0, 0);
SDL_EndGPURenderPass(pass);
}
SDL_SubmitGPUCommandBuffer(cmd);
@@ -942,13 +377,7 @@ namespace Rendering {
release_pipeline(pipeline_);
release_pipeline(crtpi_pipeline_);
release_pipeline(postfx_offscreen_pipeline_);
release_pipeline(upscale_pipeline_);
release_pipeline(downscale_pipeline_);
release_texture(scene_texture_);
release_texture(scaled_texture_);
release_texture(postfx_texture_);
ss_factor_ = 0;
if (upload_buffer_ != nullptr) {
SDL_ReleaseGPUTransferBuffer(device_, upload_buffer_);
upload_buffer_ = nullptr;
@@ -957,10 +386,6 @@ namespace Rendering {
SDL_ReleaseGPUSampler(device_, sampler_);
sampler_ = nullptr;
}
if (linear_sampler_ != nullptr) {
SDL_ReleaseGPUSampler(device_, linear_sampler_);
linear_sampler_ = nullptr;
}
}
}
@@ -1035,6 +460,9 @@ namespace Rendering {
uniforms_.curvature = p.curvature;
uniforms_.bleeding = p.bleeding;
uniforms_.flicker = p.flicker;
uniforms_.scan_dark_ratio = p.scan_dark_ratio;
uniforms_.scan_dark_floor = p.scan_dark_floor;
uniforms_.scan_edge_soft = p.scan_edge_soft;
}
void SDL3GPUShader::setCrtPiParams(const CrtPiParams& p) {
@@ -1080,28 +508,6 @@ namespace Rendering {
integer_scale_ = integer_scale;
}
void SDL3GPUShader::setOversample(int factor) {
const int NEW_FACTOR = std::max(1, factor);
if (NEW_FACTOR == oversample_) { return; }
oversample_ = NEW_FACTOR;
if (is_initialized_) {
reinitTexturesAndBuffer();
}
}
void SDL3GPUShader::setLinearUpscale(bool linear) {
linear_upscale_ = linear;
}
void SDL3GPUShader::setDownscaleAlgo(int algo) {
downscale_algo_ = std::max(0, std::min(algo, 2));
}
auto SDL3GPUShader::getSsTextureSize() const -> std::pair<int, int> {
if (ss_factor_ <= 1) { return {0, 0}; }
return {game_width_ * ss_factor_, game_height_ * ss_factor_};
}
// ---------------------------------------------------------------------------
// reinitTexturesAndBuffer
// ---------------------------------------------------------------------------
@@ -1113,18 +519,12 @@ namespace Rendering {
SDL_ReleaseGPUTexture(device_, scene_texture_);
scene_texture_ = nullptr;
}
if (scaled_texture_ != nullptr) {
SDL_ReleaseGPUTexture(device_, scaled_texture_);
scaled_texture_ = nullptr;
}
ss_factor_ = 0;
if (upload_buffer_ != nullptr) {
SDL_ReleaseGPUTransferBuffer(device_, upload_buffer_);
upload_buffer_ = nullptr;
}
uniforms_.screen_height = static_cast<float>(game_height_);
uniforms_.oversample = static_cast<float>(oversample_);
SDL_GPUTextureCreateInfo tex_info = {};
tex_info.type = SDL_GPU_TEXTURETYPE_2D;
@@ -1151,55 +551,7 @@ namespace Rendering {
return false;
}
std::cout << "SDL3GPUShader: reinit — scene " << game_width_ << "x" << game_height_ << ", SS " << (oversample_ > 1 ? "on" : "off") << '\n';
return true;
}
auto SDL3GPUShader::calcSsFactor(float zoom) -> int {
const int MULTIPLE = 3;
const int N = static_cast<int>(std::ceil(zoom / static_cast<float>(MULTIPLE)));
return std::max(1, N) * MULTIPLE;
}
auto SDL3GPUShader::recreateScaledTexture(int factor) -> bool {
if (scaled_texture_ != nullptr) {
SDL_ReleaseGPUTexture(device_, scaled_texture_);
scaled_texture_ = nullptr;
}
if (postfx_texture_ != nullptr) {
SDL_ReleaseGPUTexture(device_, postfx_texture_);
postfx_texture_ = nullptr;
}
ss_factor_ = 0;
const int W = game_width_ * factor;
const int H = game_height_ * factor;
SDL_GPUTextureCreateInfo info = {};
info.type = SDL_GPU_TEXTURETYPE_2D;
info.format = SDL_GPU_TEXTUREFORMAT_B8G8R8A8_UNORM;
info.usage = SDL_GPU_TEXTUREUSAGE_SAMPLER | SDL_GPU_TEXTUREUSAGE_COLOR_TARGET;
info.width = static_cast<Uint32>(W);
info.height = static_cast<Uint32>(H);
info.layer_count_or_depth = 1;
info.num_levels = 1;
scaled_texture_ = SDL_CreateGPUTexture(device_, &info);
if (scaled_texture_ == nullptr) {
std::cout << "SDL3GPUShader: failed to create scaled texture " << W << "x" << H << ": " << SDL_GetError() << '\n';
return false;
}
postfx_texture_ = SDL_CreateGPUTexture(device_, &info);
if (postfx_texture_ == nullptr) {
std::cout << "SDL3GPUShader: failed to create postfx texture " << W << "x" << H << ": " << SDL_GetError() << '\n';
SDL_ReleaseGPUTexture(device_, scaled_texture_);
scaled_texture_ = nullptr;
return false;
}
ss_factor_ = factor;
std::cout << "SDL3GPUShader: scaled+postfx textures " << W << "x" << H << " (factor " << factor << "x)" << '\n';
std::cout << "SDL3GPUShader: reinit — scene " << game_width_ << "x" << game_height_ << '\n';
return true;
}