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Copy pathexample_gl.cpp
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266 lines (238 loc) · 9.11 KB
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#include <GL/gl3w.h>
#include <GLFW/glfw3.h>
#include <iostream>
#define TINYDDSLOADER_IMPLEMENTATION
#include "tinyddsloader.h"
#ifndef GL_EXT_texture_compression_s3tc
#define GL_EXT_texture_compression_s3tc 1
#define GL_COMPRESSED_RGB_S3TC_DXT1_EXT 0x83F0
#define GL_COMPRESSED_RGBA_S3TC_DXT1_EXT 0x83F1
#define GL_COMPRESSED_RGBA_S3TC_DXT3_EXT 0x83F2
#define GL_COMPRESSED_RGBA_S3TC_DXT5_EXT 0x83F3
#define GL_COMPRESSED_RED_RGTC1_EXT 0x8DBB
#define GL_COMPRESSED_SIGNED_RED_RGTC1_EXT 0x8DBC
#define GL_COMPRESSED_RED_GREEN_RGTC2_EXT 0x8DBD
#define GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT 0x8DBE
#endif /* GL_EXT_texture_compression_s3tc */
using namespace tinyddsloader;
struct GLSwizzle {
GLenum m_r, m_g, m_b, m_a;
};
struct GLFormat {
DDSFile::DXGIFormat m_dxgiFormat;
GLenum m_type;
GLenum m_format;
GLSwizzle m_swizzle;
};
bool TranslateFormat(DDSFile::DXGIFormat fmt, GLFormat* outFormat) {
static const GLSwizzle sws[] = {
{GL_RED, GL_GREEN, GL_BLUE, GL_ALPHA},
{GL_BLUE, GL_GREEN, GL_RED, GL_ALPHA},
{GL_BLUE, GL_GREEN, GL_RED, GL_ONE},
{GL_RED, GL_GREEN, GL_BLUE, GL_ONE},
{GL_RED, GL_ZERO, GL_ZERO, GL_ZERO},
{GL_RED, GL_GREEN, GL_ZERO, GL_ZERO},
};
using DXGIFmt = DDSFile::DXGIFormat;
static const GLFormat formats[] = {
{DXGIFmt::R8G8B8A8_UNorm, GL_UNSIGNED_BYTE, GL_RGBA, sws[0]},
{DXGIFmt::B8G8R8A8_UNorm, GL_UNSIGNED_BYTE, GL_RGBA, sws[1]},
{DXGIFmt::B8G8R8X8_UNorm, GL_UNSIGNED_BYTE, GL_RGBA, sws[2]},
{DXGIFmt::BC1_UNorm, 0, GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, sws[0]},
{DXGIFmt::BC2_UNorm, 0, GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, sws[0]},
{DXGIFmt::BC3_UNorm, 0, GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, sws[0]},
{DXGIFmt::BC4_UNorm, 0, GL_COMPRESSED_RED_RGTC1_EXT, sws[0]},
{DXGIFmt::BC4_SNorm, 0, GL_COMPRESSED_SIGNED_RED_RGTC1_EXT, sws[0]},
{DXGIFmt::BC5_UNorm, 0, GL_COMPRESSED_RED_GREEN_RGTC2_EXT, sws[0]},
{DXGIFmt::BC5_SNorm, 0, GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT,
sws[0]},
};
for (const auto& format : formats) {
if (format.m_dxgiFormat == fmt) {
if (outFormat) {
*outFormat = format;
}
return true;
}
}
return false;
}
bool IsCompressed(GLenum fmt) {
switch (fmt) {
case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
case GL_COMPRESSED_RED_RGTC1_EXT:
case GL_COMPRESSED_SIGNED_RED_RGTC1_EXT:
case GL_COMPRESSED_RED_GREEN_RGTC2_EXT:
case GL_COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT:
return true;
default:
return false;
}
}
bool LoadGLTexture(GLuint tex, DDSFile& dds) {
GLenum target = GL_INVALID_ENUM;
bool isArray = false;
if (dds.GetTextureDimension() == DDSFile::TextureDimension::Texture1D) {
if (dds.GetArraySize() > 1) {
target = GL_TEXTURE_1D_ARRAY;
isArray = true;
} else {
target = GL_TEXTURE_1D;
}
} else if (dds.GetTextureDimension() ==
DDSFile::TextureDimension::Texture2D) {
if (dds.GetArraySize() > 1) {
if (dds.IsCubemap()) {
if (dds.GetArraySize() > 6) {
target = GL_TEXTURE_CUBE_MAP_ARRAY;
isArray = true;
} else {
target = GL_TEXTURE_CUBE_MAP;
}
} else {
target = GL_TEXTURE_2D_ARRAY;
isArray = true;
}
} else {
target = GL_TEXTURE_2D;
}
} else if (dds.GetTextureDimension() ==
DDSFile::TextureDimension::Texture3D) {
target = GL_TEXTURE_3D;
}
GLFormat format;
if (!TranslateFormat(dds.GetFormat(), &format)) {
return false;
}
glBindTexture(target, tex);
glTexParameteri(target, GL_TEXTURE_BASE_LEVEL, 0);
glTexParameteri(target, GL_TEXTURE_MAX_LEVEL, dds.GetMipCount() - 1);
glTexParameteri(target, GL_TEXTURE_SWIZZLE_R, format.m_swizzle.m_r);
glTexParameteri(target, GL_TEXTURE_SWIZZLE_G, format.m_swizzle.m_g);
glTexParameteri(target, GL_TEXTURE_SWIZZLE_B, format.m_swizzle.m_b);
glTexParameteri(target, GL_TEXTURE_SWIZZLE_A, format.m_swizzle.m_a);
switch (target) {
case GL_TEXTURE_1D:
glTexStorage1D(target, dds.GetMipCount(), format.m_format,
dds.GetWidth());
break;
case GL_TEXTURE_1D_ARRAY:
glTexStorage2D(target, dds.GetMipCount(), format.m_format,
dds.GetWidth(), dds.GetArraySize());
break;
case GL_TEXTURE_2D:
glTexStorage2D(target, dds.GetMipCount(), format.m_format,
dds.GetWidth(), dds.GetHeight());
break;
case GL_TEXTURE_CUBE_MAP:
glTexStorage2D(target, dds.GetMipCount(), format.m_format,
dds.GetWidth(), dds.GetHeight());
break;
case GL_TEXTURE_2D_ARRAY:
glTexStorage3D(target, dds.GetMipCount(), format.m_format,
dds.GetWidth(), dds.GetHeight(), dds.GetArraySize());
break;
case GL_TEXTURE_3D:
glTexStorage3D(target, dds.GetMipCount(), format.m_format,
dds.GetWidth(), dds.GetHeight(), dds.GetDepth());
break;
case GL_TEXTURE_CUBE_MAP_ARRAY:
glTexStorage3D(target, dds.GetMipCount(), format.m_format,
dds.GetWidth(), dds.GetHeight(), dds.GetArraySize());
break;
default:
glBindTexture(target, 0);
return false;
}
dds.Flip();
uint32_t numFaces = dds.IsCubemap() ? 6 : 1;
for (uint32_t layer = 0; layer < dds.GetArraySize(); layer++) {
for (uint32_t face = 0; face < numFaces; face++) {
for (uint32_t level = 0; level < dds.GetMipCount(); level++) {
GLenum target2 = dds.IsCubemap()
? (GL_TEXTURE_CUBE_MAP_POSITIVE_X + face)
: target;
auto imageData = dds.GetImageData(level, layer * numFaces);
switch (target) {
case GL_TEXTURE_1D:
if (IsCompressed(format.m_format)) {
glCompressedTexSubImage1D(
target2, level, 0, imageData->m_width,
format.m_format, imageData->m_memSlicePitch,
imageData->m_mem);
} else {
glTexSubImage1D(target2, level, 0,
imageData->m_width, format.m_format,
format.m_type, imageData->m_mem);
}
break;
case GL_TEXTURE_1D_ARRAY:
case GL_TEXTURE_2D:
case GL_TEXTURE_CUBE_MAP: {
auto w = imageData->m_width;
auto h = isArray ? layer : imageData->m_height;
if (IsCompressed(format.m_format)) {
glCompressedTexSubImage2D(
target2, level, 0, 0, w, h, format.m_format,
imageData->m_memSlicePitch, imageData->m_mem);
} else {
glTexSubImage2D(target2, level, 0, 0, w, h,
format.m_format, format.m_type,
imageData->m_mem);
}
break;
}
default:
glBindTexture(target, 0);
return false;
}
}
}
}
glBindTexture(target, 0);
return true;
}
int main(int argc, char** argv) {
if (argc < 2) {
return 1;
}
DDSFile dds;
auto ret = dds.Load(argv[1]);
if (tinyddsloader::Result::Success != ret) {
std::cout << "Failed to load.[" << argv[1] << "]\n";
std::cout << "Result : " << int(ret) << "\n";
return 1;
}
if (!glfwInit()) {
return 1;
}
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = nullptr;
window = glfwCreateWindow(800, 600, "ddsloader", nullptr, nullptr);
if (!window) {
glfwTerminate();
return 1;
}
glfwMakeContextCurrent(window);
if (gl3wInit() != 0) {
return 1;
}
GLuint tex;
glGenTextures(1, &tex);
if (!LoadGLTexture(tex, dds)) {
return 1;
}
while (!glfwWindowShouldClose(window)) {
glClear(GL_COLOR_BUFFER_BIT);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}