Add lodepng to save 16bit PNG.

Suppress clang/gcc warnings.

examples/basic/main.cpp

@@ -50,8 +50,9 @@ std::map<int, GLuint> bindMesh(std::map<int, GLuint> vbos,
                    From spec2.0 readme:
                    https://github.com/KhronosGroup/glTF/tree/master/specification/2.0
                             ... drawArrays function should be used with a count equal to
-                   the count            property of any of the accessors referenced by the attributes
-                   property            (they are all equal for a given primitive).
+                   the count            property of any of the accessors referenced by the
+                   attributes            property            (they are all equal for a given
+                   primitive).
                  */
     }
 
@@ -112,8 +113,29 @@ std::map<int, GLuint> bindMesh(std::map<int, GLuint> vbos,
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
 
+    GLenum format = GL_RGBA;
+
+    if (image.component == 1) {
+      format = GL_RED;
+    } else if (image.component == 2) {
+      format = GL_RG;
+    } else if (image.component == 3) {
+      format = GL_RGB;
+    } else {
+      // ???
+    }
+
+    GLenum type = GL_UNSIGNED_BYTE;
+    if (image.bits == 8) {
+      // ok
+    } else if (image.bits == 16) {
+      type = GL_UNSIGNED_SHORT;
+    } else {
+      // ???
+    }
+
     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.width, image.height, 0,
-                 GL_RGBA, GL_UNSIGNED_BYTE, &image.image.at(0));
+                 format, type, &image.image.at(0));
   }
 
   return vbos;
@@ -255,7 +277,7 @@ void displayLoop(Window &window, const std::string &filename) {
   glm::vec3 model_pos = glm::vec3(-3, 0, -3);
 
   // generate a camera view, based on eye-position and lookAt world-position
-  glm::mat4 view_mat = genView(glm::vec3(2, 2, 2), model_pos);
+  glm::mat4 view_mat = genView(glm::vec3(2, 2, 20), model_pos);
 
   glm::vec3 sun_position = glm::vec3(3.0, 10.0, -5.0);
   glm::vec3 sun_color = glm::vec3(1.0);
@@ -287,6 +309,11 @@ void displayLoop(Window &window, const std::string &filename) {
   }
 }
 
+static void error_callback(int error, const char *description) {
+  (void)error;
+  fprintf(stderr, "Error: %s\n", description);
+}
+
 int main(int argc, char **argv) {
   std::string filename = "../../models/Cube/Cube.gltf";
 
@@ -294,14 +321,18 @@ int main(int argc, char **argv) {
     filename = argv[1];
   }
 
+  glfwSetErrorCallback(error_callback);
+
   if (!glfwInit()) return -1;
 
-  // Force create 3.3 profile.
+  // Force create OpenGL 3.3
+  // NOTE(syoyo): Linux + NVIDIA driver segfaults for some reason? commenting out glfwWindowHint will work.
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 #ifdef __APPLE__
   glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#endif
 #endif
 
   Window window = Window(800, 600, "TinyGLTF basic example");

examples/common/LICENSE.lodepng

@@ -0,0 +1,21 @@
+Copyright (c) 2005-2018 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+    

examples/gltfutil/CMakeLists.txt

@@ -4,9 +4,10 @@ project(gltfutil)
 set(CMAKE_CXX_STANDARD 11)
 
 include_directories(../../)
+include_directories(../common/)
 
 file(GLOB gltfutil_sources *.cc *.h)
-add_executable(gltfutil ${gltfutil_sources})
+add_executable(gltfutil ${gltfutil_sources} ../common/lodepng.cpp)
 
 install ( TARGETS
   gltfutil

examples/gltfutil/texture_dumper.cc

@@ -4,12 +4,30 @@
 #include "stb_image_write.h"
 #include "texture_dumper.h"
 
+#include "lodepng.h" // ../common
+
 #include <tiny_gltf.h>
 
 using namespace gltfutil;
 using namespace tinygltf;
 using std::cout;
 
+static LodePNGColorType GetLodePNGColorType(int channels)
+{
+  if (channels == 1) {
+    return LodePNGColorType::LCT_GREY; 
+  } else if (channels == 2) {
+    return LodePNGColorType::LCT_GREY_ALPHA; 
+  } else if (channels == 3) {
+    return LodePNGColorType::LCT_RGB; 
+  } else if (channels == 4) {
+    return LodePNGColorType::LCT_RGBA; 
+  } else {
+    std::cerr << "??? unsupported channels " << channels << "\n";
+    return LodePNGColorType::LCT_RGB;  // FIXME(syoyo): Raise error
+  }
+}
+
 texture_dumper::texture_dumper(const Model& input)
     : model(input), configured_format(texture_output_format::png) {
   cout << "Texture dumper\n";
@@ -29,31 +47,24 @@ void texture_dumper::dump_to_folder(const std::string& path) {
     cout << "pixel bit depth :" << image.bits << '\n';
     std::string name = image.name.empty() ? std::to_string(index) : image.name;
 
-    // TODO stb_image_write doesn't support any 16bit wirtes;
     unsigned char* bytes_to_write =
         const_cast<unsigned char*>(image.image.data());
-    unsigned char* tmp_buffer = nullptr;
-    if (image.pixel_type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT) {
-      unsigned short max = 0xFFFF;
-      tmp_buffer = new unsigned char[image.width * image.height *
-                                     image.component * sizeof(unsigned char)];
-
-      unsigned short* buffer_as_shorts = (unsigned short*)bytes_to_write;
-      for (int i = 0; i < image.component * image.width * image.height; ++i) {
-        tmp_buffer[i] =
-            (unsigned char)(0xFF * (float(buffer_as_shorts[i]) / float(max)));
-      }
-      bytes_to_write =
-          tmp_buffer;  // swap the pointer, but keep tmp_buffer around as we
-                       // need to delete that memory later
-    }
 
     switch (configured_format) {
       case texture_output_format::png:
         name = path + "/" + name + ".png";
         std::cout << "Image will be written to " << name << '\n';
-        stbi_write_png(name.c_str(), image.width, image.height, image.component,
-                       bytes_to_write, 0);
+
+        if (image.pixel_type == TINYGLTF_COMPONENT_TYPE_UNSIGNED_SHORT) {
+          // Use lodepng to save 16bit PNG.
+          // TODO(syoyo): check status
+          unsigned ret = lodepng::encode(name, bytes_to_write, image.width, image.height, GetLodePNGColorType(image.component), /* bits */16);
+          assert(ret == 0); // 0 = no err.
+        } else {
+          // TODO(syoyo): check status
+          stbi_write_png(name.c_str(), image.width, image.height, image.component,
+                         bytes_to_write, 0);
+        }
         break;
       case texture_output_format::bmp:
         std::cout << "Image will be written to " << name << '\n';
@@ -68,8 +79,6 @@ void texture_dumper::dump_to_folder(const std::string& path) {
                        bytes_to_write);
         break;
     }
-
-    delete[] tmp_buffer;
   }
 }
 

tiny_gltf.h

@@ -1077,7 +1077,19 @@ class TinyGLTF {
 #if __has_warning("-Wnewline-eof")
 #pragma clang diagnostic ignored "-Wnewline-eof"
 #endif
+#if __has_warning("-Wunused-parameter")
+#pragma clang diagnostic ignored "-Wunused-parameter"
 #endif
+#if __has_warning("-Wmismatched-tags")
+#pragma clang diagnostic ignored "-Wmismatched-tags"
+#endif
+#endif
+
+// Disable GCC warnigs
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wtype-limits"
+#endif // __GNUC__
 
 #include "json.hpp"
 
@@ -1098,6 +1110,10 @@ class TinyGLTF {
 #pragma clang diagnostic pop
 #endif
 
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
 #ifdef _WIN32
 
 // issue 143.
@@ -1638,6 +1654,7 @@ void TinyGLTF::SetImageLoader(LoadImageDataFunction func, void *user_data) {
 bool LoadImageData(Image *image, const int image_idx, std::string *err,
                    std::string *warn, int req_width, int req_height,
                    const unsigned char *bytes, int size, void *user_data) {
+  (void)user_data;
   (void)warn;
 
   int w, h, comp, req_comp;
@@ -3111,6 +3128,8 @@ static bool ParsePrimitive(Primitive *primitive, Model *model, std::string *err,
   {
       ParseDracoExtension(primitive, model, err, dracoExtension->second);
   }
+#else
+  (void)model;
 #endif
 
   return true;