epicalert/facecam2d
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Add support for webp textures

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This allows for models to use lossy textures with an alpha channel,
none of the formats supported by stb_image.h could do this.
This commit is contained in:
Epicalert 2021-02-06 21:19:33 +08:00
parent 25f97e5f90
commit 4ce0e0e10d
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GPG key ID: CAA46F858D0979BD
3 changed files with 34 additions and 2 deletions
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4
CMakeLists.txt
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@ -1,6 +1,8 @@
cmake_minimum_required( VERSION 3.0 )
project( Facecam2D VERSION 0.1.0 )
set( CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake )
find_package( libzip REQUIRED )
find_package( WebP REQUIRED )
find_package( OpenCV REQUIRED )
message (STATUS "Found OpenCV at: " ${OpenCV_INCLUDE_DIRS} )
find_package( OpenGL REQUIRED )
@ -43,4 +45,4 @@ add_executable( fc2d
src/toml.c
src/tomlcpp.cpp
)
target_link_libraries( fc2d ${OpenCV_LIBS} ${OPENGL_LIBRARIES} FreeGLUT::freeglut GLEW::glew zip )
target_link_libraries( fc2d ${OpenCV_LIBS} ${OPENGL_LIBRARIES} ${WEBP_LIBRARIES} FreeGLUT::freeglut GLEW::glew zip )

9
cmake/FindWebP.cmake Normal file
View file

@ -0,0 +1,9 @@
find_path( WEBP_INCLUDE_DIR NAMES webp/decode.h )
find_library( WEBP_LIBRARY NAMES webp PATHS /usr/lib /usr/lib64 /lib /lib64 /usr/local/lib )
if (WEBP_INCLUDE_DIR AND WEBP_LIBRARY)
set(WEBP_INCLUDE_DIR ${WEBP_INCLUDE_DIR})
set(WEBP_LIBRARIES ${WEBP_LIBRARY})
set( WEBP_FOUND "TRUE" )
endif (WEBP_INCLUDE_DIR AND WEBP_LIBRARY)

23
src/graphics.cpp
View file

@ -8,6 +8,8 @@
#define STB_IMAGE_IMPLEMENTATION
#include <stb_image.h>
#include <webp/decode.h>
#include <iostream>
#include <graphics.hpp>
@ -103,7 +105,26 @@ void initTexture (GLuint* texNum, unsigned char* buffer, size_t bufferLength) {
glBindTexture(GL_TEXTURE_2D, *texNum);
int x, y, channels;
GLubyte* pixels = stbi_load_from_memory(buffer, bufferLength, &x, &y, &channels, 4);
GLubyte* pixels;
int webp = WebPGetInfo(buffer, bufferLength, &x, &y);
if (webp) {
pixels = WebPDecodeRGBA(buffer, bufferLength, &x, &y);
} else {
//try stb_image (png, jpg, gif, etc)
pixels = stbi_load_from_memory(buffer, bufferLength, &x, &y, &channels, 4);
if (!pixels) {
std::cerr << "Corrupt or unsupported texture format!" << std::endl;
GLubyte defaultPixels[] =
{255, 0, 255, 255, 0, 0, 0, 255,
0, 0, 0, 255, 255, 0, 255, 255 };
pixels = defaultPixels;
x = 2;
y = 2;
}
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);