Add software S3TC decoder.

1 files changed, 102 insertions, 0 deletions

diff --git a/server/TracyTexture.cpp b/server/TracyTexture.cpp
index dd07751f..be400278 100644
--- a/server/TracyTexture.cpp
+++ b/server/TracyTexture.cpp
@@ -1,4 +1,5 @@
 #include <inttypes.h>
+#include <string.h>
 
 #ifdef __EMSCRIPTEN__
 #  include <emscripten/html5.h>
@@ -7,6 +8,7 @@
 #  include "../profiler/src/imgui/imgui_impl_opengl3_loader.h"
 #endif
 #include "TracyTexture.hpp"
+#include "../public/common/TracyForceInline.hpp"
 
 #ifndef COMPRESSED_RGB_S3TC_DXT1_EXT
 #  define COMPRESSED_RGB_S3TC_DXT1_EXT 0x83F0
@@ -55,6 +57,88 @@ void FreeTexture( void* _tex, void(*runOnMainThread)(std::function<void()>, bool
     runOnMainThread( [tex] { glDeleteTextures( 1, &tex ); }, false );
 }
 
+static tracy_force_inline void DecodeDxt1Part( uint64_t d, uint32_t* dst, uint32_t w )
+{
+    uint8_t* in = (uint8_t*)&d;
+    uint16_t c0, c1;
+    uint32_t idx;
+    memcpy( &c0, in, 2 );
+    memcpy( &c1, in+2, 2 );
+    memcpy( &idx, in+4, 4 );
+
+    uint8_t r0 = ( ( c0 & 0xF800 ) >> 8 ) | ( ( c0 & 0xF800 ) >> 13 );
+    uint8_t g0 = ( ( c0 & 0x07E0 ) >> 3 ) | ( ( c0 & 0x07E0 ) >> 9 );
+    uint8_t b0 = ( ( c0 & 0x001F ) << 3 ) | ( ( c0 & 0x001F ) >> 2 );
+
+    uint8_t r1 = ( ( c1 & 0xF800 ) >> 8 ) | ( ( c1 & 0xF800 ) >> 13 );
+    uint8_t g1 = ( ( c1 & 0x07E0 ) >> 3 ) | ( ( c1 & 0x07E0 ) >> 9 );
+    uint8_t b1 = ( ( c1 & 0x001F ) << 3 ) | ( ( c1 & 0x001F ) >> 2 );
+
+    uint32_t dict[4];
+
+    dict[0] = 0xFF000000 | ( b0 << 16 ) | ( g0 << 8 ) | r0;
+    dict[1] = 0xFF000000 | ( b1 << 16 ) | ( g1 << 8 ) | r1;
+
+    uint32_t r, g, b;
+    if( c0 > c1 )
+    {
+        r = (2*r0+r1)/3;
+        g = (2*g0+g1)/3;
+        b = (2*b0+b1)/3;
+        dict[2] = 0xFF000000 | ( b << 16 ) | ( g << 8 ) | r;
+        r = (2*r1+r0)/3;
+        g = (2*g1+g0)/3;
+        b = (2*b1+b0)/3;
+        dict[3] = 0xFF000000 | ( b << 16 ) | ( g << 8 ) | r;
+    }
+    else
+    {
+        r = (int(r0)+r1)/2;
+        g = (int(g0)+g1)/2;
+        b = (int(b0)+b1)/2;
+        dict[2] = 0xFF000000 | ( b << 16 ) | ( g << 8 ) | r;
+        dict[3] = 0xFF000000;
+    }
+
+    memcpy( dst+0, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+1, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+2, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+3, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    dst += w;
+
+    memcpy( dst+0, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+1, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+2, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+3, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    dst += w;
+
+    memcpy( dst+0, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+1, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+2, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+3, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    dst += w;
+
+    memcpy( dst+0, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+1, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+2, dict + (idx & 0x3), 4 );
+    idx >>= 2;
+    memcpy( dst+3, dict + (idx & 0x3), 4 );
+}
+
 void UpdateTexture( void* _tex, const char* data, int w, int h )
 {
     auto tex = (GLuint)(intptr_t)_tex;
@@ -63,6 +147,24 @@ void UpdateTexture( void* _tex, const char* data, int w, int h )
     {
         glCompressedTexImage2D( GL_TEXTURE_2D, 0, COMPRESSED_RGB_S3TC_DXT1_EXT, w, h, 0, w * h / 2, data );
     }
+    else
+    {
+        auto tmp = new uint32_t[w*h];
+        auto src = (const uint64_t*)data;
+        auto dst = tmp;
+        for( int y=0; y<h/4; y++ )
+        {
+            for( int x=0; x<w/4; x++ )
+            {
+                uint64_t d = *src++;
+                DecodeDxt1Part( d, dst, w );
+                dst += 4;
+            }
+            dst += w*3;
+        }
+        glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, tmp );
+        delete[] tmp;
+    }
 }
 
 void UpdateTextureRGBA( void* _tex, void* data, int w, int h )