Support HDR R32G32B32 float textures loading

4 files changed, 36 insertions, 6 deletions

diff --git a/src/raylib.h b/src/raylib.h
index 3107661f..4038215e 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -553,6 +553,7 @@ typedef enum {
     UNCOMPRESSED_R5G5B5A1,          // 16 bpp (1 bit alpha)
     UNCOMPRESSED_R4G4B4A4,          // 16 bpp (4 bit alpha)
     UNCOMPRESSED_R8G8B8A8,          // 32 bpp
+    UNCOMPRESSED_R32G32B32,         // 32 bit per channel (float) - HDR
     COMPRESSED_DXT1_RGB,            // 4 bpp (no alpha)
     COMPRESSED_DXT1_RGBA,           // 4 bpp (1 bit alpha)
     COMPRESSED_DXT3_RGBA,           // 8 bpp
diff --git a/src/rlgl.c b/src/rlgl.c
index edf9e60b..323a95b1 100644
--- a/src/rlgl.c
+++ b/src/rlgl.c
@@ -317,7 +317,8 @@ static PFNGLDELETEVERTEXARRAYSOESPROC glDeleteVertexArrays;
 
 // Compressed textures support flags
 static bool texCompDXTSupported = false;    // DDS texture compression support
-static bool npotSupported = false;          // NPOT textures full support
+static bool texNPOTSupported = false;          // NPOT textures full support
+static bool texFloatSupported = false;      // float textures support (32 bit per channel)
 
 static int blendMode = 0;   // Track current blending mode
 
@@ -1050,7 +1051,7 @@ void rlglInit(int width, int height)
 
     // NOTE: On OpenGL 3.3 VAO and NPOT are supported by default
     vaoSupported = true;
-    npotSupported = true;
+    texNPOTSupported = true;
 
     // We get a list of available extensions and we check for some of them (compressed textures)
     // NOTE: We don't need to check again supported extensions but we do (GLAD already dealt with that)
@@ -1119,7 +1120,10 @@ void rlglInit(int width, int height)
 
         // Check NPOT textures support
         // NOTE: Only check on OpenGL ES, OpenGL 3.3 has NPOT textures full support as core feature
-        if (strcmp(extList[i], (const char *)"GL_OES_texture_npot") == 0) npotSupported = true;
+        if (strcmp(extList[i], (const char *)"GL_OES_texture_npot") == 0) texNPOTSupported = true;
+        
+        // Check texture float support
+        if (strcmp(extList[i], (const char *)"OES_texture_float") == 0) texFloatSupported = true;
 #endif
 
         // DDS texture compression support
@@ -1159,7 +1163,7 @@ void rlglInit(int width, int height)
     if (vaoSupported) TraceLog(INFO, "[EXTENSION] VAO extension detected, VAO functions initialized successfully");
     else TraceLog(WARNING, "[EXTENSION] VAO extension not found, VAO usage not supported");
 
-    if (npotSupported) TraceLog(INFO, "[EXTENSION] NPOT textures extension detected, full NPOT textures supported");
+    if (texNPOTSupported) TraceLog(INFO, "[EXTENSION] NPOT textures extension detected, full NPOT textures supported");
     else TraceLog(WARNING, "[EXTENSION] NPOT textures extension not found, limited NPOT support (no-mipmaps, no-repeat)");
 #endif
 
@@ -1421,6 +1425,7 @@ unsigned int rlglLoadTexture(void *data, int width, int height, int format, int
         case UNCOMPRESSED_R5G5B5A1: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB5_A1, width, height, 0, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, (unsigned short *)data); break;
         case UNCOMPRESSED_R4G4B4A4: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA4, width, height, 0, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, (unsigned short *)data); break;
         case UNCOMPRESSED_R8G8B8A8: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, (unsigned char *)data); break;
+        case UNCOMPRESSED_R32G32B32: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB32F, width, height, 0, GL_RGB, GL_FLOAT, (float *)data); break;
         case COMPRESSED_DXT1_RGB: if (texCompDXTSupported) LoadCompressedTexture((unsigned char *)data, width, height, mipmapCount, GL_COMPRESSED_RGB_S3TC_DXT1_EXT); break;
         case COMPRESSED_DXT1_RGBA: if (texCompDXTSupported) LoadCompressedTexture((unsigned char *)data, width, height, mipmapCount, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT); break;
         case COMPRESSED_DXT3_RGBA: if (texCompDXTSupported) LoadCompressedTexture((unsigned char *)data, width, height, mipmapCount, GL_COMPRESSED_RGBA_S3TC_DXT3_EXT); break;
@@ -1446,6 +1451,7 @@ unsigned int rlglLoadTexture(void *data, int width, int height, int format, int
         case UNCOMPRESSED_R4G4B4A4: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, (unsigned short *)data); break;
         case UNCOMPRESSED_R8G8B8A8: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, (unsigned char *)data); break;
 #if defined(GRAPHICS_API_OPENGL_ES2)
+        case UNCOMPRESSED_R32G32B32: if (texFloatSupported) glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_FLOAT, (float *)data); break;  // Requries extension OES_texture_float
         case COMPRESSED_DXT1_RGB: if (texCompDXTSupported) LoadCompressedTexture((unsigned char *)data, width, height, mipmapCount, GL_COMPRESSED_RGB_S3TC_DXT1_EXT); break;
         case COMPRESSED_DXT1_RGBA: if (texCompDXTSupported) LoadCompressedTexture((unsigned char *)data, width, height, mipmapCount, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT); break;
         case COMPRESSED_DXT3_RGBA: if (texCompDXTSupported) LoadCompressedTexture((unsigned char *)data, width, height, mipmapCount, GL_COMPRESSED_RGBA_S3TC_DXT3_EXT); break;     // NOTE: Not supported by WebGL
@@ -1466,7 +1472,7 @@ unsigned int rlglLoadTexture(void *data, int width, int height, int format, int
     // NOTE: glTexParameteri does NOT affect texture uploading, just the way it's used
 #if defined(GRAPHICS_API_OPENGL_ES2)
     // NOTE: OpenGL ES 2.0 with no GL_OES_texture_npot support (i.e. WebGL) has limited NPOT support, so CLAMP_TO_EDGE must be used
-    if (npotSupported)
+    if (texNPOTSupported)
     {
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);       // Set texture to repeat on x-axis
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);       // Set texture to repeat on y-axis
@@ -1646,7 +1652,7 @@ void rlglGenerateMipmaps(Texture2D *texture)
     if (((texture->width > 0) && ((texture->width & (texture->width - 1)) == 0)) &&
         ((texture->height > 0) && ((texture->height & (texture->height - 1)) == 0))) texIsPOT = true;
 
-    if ((texIsPOT) || (npotSupported))
+    if ((texIsPOT) || (texNPOTSupported))
     {
 #if defined(GRAPHICS_API_OPENGL_11)
         // Compute required mipmaps
diff --git a/src/rlgl.h b/src/rlgl.h
index b51d1c49..6d6ad516 100644
--- a/src/rlgl.h
+++ b/src/rlgl.h
@@ -252,6 +252,7 @@ typedef unsigned char byte;
         UNCOMPRESSED_R5G5B5A1,          // 16 bpp (1 bit alpha)
         UNCOMPRESSED_R4G4B4A4,          // 16 bpp (4 bit alpha)
         UNCOMPRESSED_R8G8B8A8,          // 32 bpp
+        UNCOMPRESSED_R32G32B32,         // 32 bit per channel (float) - HDR
         COMPRESSED_DXT1_RGB,            // 4 bpp (no alpha)
         COMPRESSED_DXT1_RGBA,           // 4 bpp (1 bit alpha)
         COMPRESSED_DXT3_RGBA,           // 8 bpp
diff --git a/src/textures.c b/src/textures.c
index d944bd64..3c336587 100644
--- a/src/textures.c
+++ b/src/textures.c
@@ -53,6 +53,7 @@
 // Default configuration flags (supported features)
 //-------------------------------------------------
 #define SUPPORT_FILEFORMAT_PNG
+#define SUPPORT_FILEFORMAT_HDR
 #define SUPPORT_IMAGE_MANIPULATION
 //-------------------------------------------------
 
@@ -205,6 +206,25 @@ Image LoadImage(const char *fileName)
         else if (imgBpp == 3) image.format = UNCOMPRESSED_R8G8B8;
         else if (imgBpp == 4) image.format = UNCOMPRESSED_R8G8B8A8;
     }
+#if defined(SUPPORT_FILEFORMAT_HDR)
+    else if (IsFileExtension(fileName, ".hdr"))
+    {
+        int imgBpp = 0;
+        
+        FILE *imFile = fopen(fileName, "rb");
+
+        // Load 32 bit per channel floats data 
+        image.data = stbi_loadf(imFile, &image.width, &image.height, &imgBpp, 0);
+        
+        if (imgBpp == 3) image.format = UNCOMPRESSED_R32G32B32;
+        else 
+        {
+            // TODO: Support different number of channels at 32 bit float
+            TraceLog(WARNING, "[%s] Image fileformat not supported (only 3 channel 32 bit floats)", fileName);
+            UnloadImage(image);
+        }
+    }
+#endif
 #if defined(SUPPORT_FILEFORMAT_DDS)
     else if (IsFileExtension(fileName, ".dds")) image = LoadDDS(fileName);
 #endif
@@ -298,6 +318,7 @@ Image LoadImageRaw(const char *fileName, int width, int height, int format, int
             case UNCOMPRESSED_R5G5B5A1: image.data = (unsigned short *)malloc(size); break;               // 16 bpp (1 bit alpha)
             case UNCOMPRESSED_R4G4B4A4: image.data = (unsigned short *)malloc(size); break;               // 16 bpp (4 bit alpha)
             case UNCOMPRESSED_R8G8B8A8: image.data = (unsigned char *)malloc(size*4); size *= 4; break;   // 32 bpp
+            case UNCOMPRESSED_R32G32B32: image.data = (float *)malloc(size*12); size *= 12; break;        // 4 byte per channel (12 byte)
             default: TraceLog(WARNING, "Image format not suported"); break;
         }
 
@@ -762,6 +783,7 @@ Image ImageCopy(Image image)
         case UNCOMPRESSED_R4G4B4A4: byteSize *= 2; break;   // 16 bpp (2 bytes)
         case UNCOMPRESSED_R8G8B8: byteSize *= 3; break;     // 24 bpp (3 bytes)
         case UNCOMPRESSED_R8G8B8A8: byteSize *= 4; break;   // 32 bpp (4 bytes)
+        case UNCOMPRESSED_R32G32B32: byteSize *= 12; break; // 4 byte per channel (12 bytes)
         case COMPRESSED_DXT3_RGBA:
         case COMPRESSED_DXT5_RGBA:
         case COMPRESSED_ETC2_EAC_RGBA: