bgfx/examples/47-pixelformats/pixelformats.cpp

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/*
* Copyright 2022-2022 Sandy Carter. All rights reserved.
* License: https://github.com/bkaradzic/bgfx/blob/master/LICENSE
*/
#include "common.h"
#include "bgfx_utils.h"
#include "imgui/imgui.h"
#include <bx/allocator.h>
#include <bx/math.h>
namespace
{
const int TEXTURE_SIZE = 256;
const int HALF_TEXTURE_SIZE = TEXTURE_SIZE / 2;
const int NUM_FORMATS = bgfx::TextureFormat::UnknownDepth - bgfx::TextureFormat::Unknown - 1;
const int NUM_FORMATS_IN_ROW = (int)bx::ceil(bx::sqrt(NUM_FORMATS));
class ExamplePixelFormats : public entry::AppI
{
public:
ExamplePixelFormats(const char* _name, const char* _description, const char* _url)
: entry::AppI(_name, _description, _url)
{
}
void init(int32_t _argc, const char* const* _argv, uint32_t _width, uint32_t _height) override
{
Args args(_argc, _argv);
m_width = _width;
m_height = _height;
m_debug = BGFX_DEBUG_TEXT;
m_reset = BGFX_RESET_VSYNC;
bgfx::Init init;
init.type = args.m_type;
init.vendorId = args.m_pciId;
init.resolution.width = m_width;
init.resolution.height = m_height;
init.resolution.reset = m_reset;
bgfx::init(init);
// Enable debug text.
bgfx::setDebug(m_debug);
// Set view 0 clear state.
bgfx::setViewClear(0
, BGFX_CLEAR_COLOR|BGFX_CLEAR_DEPTH
, 0x303030ff
, 1.0f
, 0
);
const uint32_t flags = 0
| BGFX_SAMPLER_U_CLAMP
| BGFX_SAMPLER_V_CLAMP
| BGFX_SAMPLER_MIN_POINT
| BGFX_SAMPLER_MAG_POINT
;
float* rgbaf32Pixels = (float*)BX_ALLOC(entry::getAllocator(), TEXTURE_SIZE * TEXTURE_SIZE * 4 * sizeof(float));
int x, y;
for (y = 0 ; y < TEXTURE_SIZE; ++y)
{
for (x = 0; x < TEXTURE_SIZE; ++x)
{
float relX = (x - HALF_TEXTURE_SIZE) / (float) HALF_TEXTURE_SIZE;
float relY = (y - HALF_TEXTURE_SIZE) / (float) HALF_TEXTURE_SIZE;
float distance = bx::min(1.0f, bx::sqrt(relX * relX + relY * relY));
float angle = bx::atan2(relY, relX);
float* pixel = &rgbaf32Pixels[(x + y * TEXTURE_SIZE) * 4];
float hsv[3] = {angle / (2.0f * bx::kPi), 1.0f, 1.0f - distance};
bx::hsvToRgb(pixel, hsv);
pixel[3] = 1.0f - distance;
}
}
for (y = 0; y < 16; ++y)
{
for (x = 0; x < 16; ++x)
{
float* r = &rgbaf32Pixels[(x + (TEXTURE_SIZE - 36 + y) * TEXTURE_SIZE) * 4];
r[0] = 1.0f;
r[1] = 0.0f;
r[2] = 0.0f;
r[3] = 1.0f;
float* g = &rgbaf32Pixels[(x + 16 + (TEXTURE_SIZE - 36 + y) * TEXTURE_SIZE) * 4];
g[0] = 0.0f;
g[1] = 1.0f;
g[2] = 0.0f;
g[3] = 1.0f;
float* b = &rgbaf32Pixels[(x + 32 + (TEXTURE_SIZE - 36 + y) * TEXTURE_SIZE) * 4];
b[0] = 0.0f;
b[1] = 0.0f;
b[2] = 1.0f;
b[3] = 1.0f;
}
}
for (y = 0; y < 16; ++y)
{
for (x = 0; x < 48; ++x)
{
float* a = &rgbaf32Pixels[(x + (TEXTURE_SIZE - 20 + y) * TEXTURE_SIZE) * 4];
a[0] = 1.0f;
a[1] = 1.0f;
a[2] = 1.0f;
a[3] = 1.0f - (float)x / 48.0f;
}
}
bimg::TextureInfo info;
for (int i = 0; i < NUM_FORMATS; ++i)
{
int format = (int)bgfx::TextureFormat::Unknown + 1 + i;
const char* formatName = bimg::getName(bimg::TextureFormat::Enum(format));
int32_t formatNameLen = bx::strLen(formatName);
if (!bimg::imageConvert(bimg::TextureFormat::Enum(format), bimg::TextureFormat::RGBA32F)
|| formatName[formatNameLen - 1] == 'I'
|| formatName[formatNameLen - 1] == 'U'
)
{
m_textures[i] = BGFX_INVALID_HANDLE;
continue;
}
bimg::imageGetSize(&info, TEXTURE_SIZE, TEXTURE_SIZE, 1, false, false, 1, bimg::TextureFormat::Enum(format));
const bgfx::Memory* mem = bgfx::alloc(info.storageSize);
bimg::imageConvert(entry::getAllocator(), mem->data, info.format, rgbaf32Pixels, bimg::TextureFormat::RGBA32F, TEXTURE_SIZE, TEXTURE_SIZE, 1);
m_textures[i] = bgfx::createTexture2D(info.width, info.height, info.numMips > 1, info.numLayers, bgfx::TextureFormat::Enum(info.format), flags, mem);
bgfx::setName(m_textures[i], formatName);
bgfx::setViewName(bgfx::ViewId(i + 1), formatName);
}
const bgfx::Memory* checkerboardImageMemory = bgfx::alloc(TEXTURE_SIZE * TEXTURE_SIZE * 4);
bimg::imageCheckerboard(checkerboardImageMemory->data, TEXTURE_SIZE, TEXTURE_SIZE, 16, 0xFF909090, 0xFF707070);
m_checkerboard = bgfx::createTexture2D(TEXTURE_SIZE, TEXTURE_SIZE, false, 1, bgfx::TextureFormat::RGBA8, flags, checkerboardImageMemory);
BX_FREE(entry::getAllocator(), rgbaf32Pixels);
imguiCreate();
}
int shutdown() override
{
imguiDestroy();
for (auto texture: m_textures)
{
if (bgfx::isValid(texture))
bgfx::destroy(texture);
}
if (bgfx::isValid(m_checkerboard))
bgfx::destroy(m_checkerboard);
// Shutdown bgfx.
bgfx::shutdown();
return 0;
}
void imguiTextBoxUnformatted(const ImVec2& size, const char* text) const
{
ImVec2 textSize = ImGui::CalcTextSize(text);
ImVec2 textOffset = ImVec2(
size.x >= 0.0f ? bx::max((size.x - textSize.x) / 2, 0.0f) : 0.0f,
size.y >= 0.0f ? bx::max((size.y - textSize.y) / 2, 0.0f) : 0.0f
);
ImGui::SetCursorPos(ImVec2(ImGui::GetCursorPosX() + textOffset.x, ImGui::GetCursorPosY() + textOffset.y));
ImGui::TextUnformatted(text);
};
void imguiTexturePreview(const ImVec2& size, bgfx::TextureHandle texture, const ImVec2& previewSizeHint = ImVec2(-1.0f, -1.0f)) const
{
ImVec2 origin = ImGui::GetCursorScreenPos();
ImVec2 previewSize = ImVec2(
previewSizeHint.x >= 0.0f ? previewSizeHint.x : size.x,
previewSizeHint.y >= 0.0f ? previewSizeHint.y : size.y
);
ImVec2 previewPos = ImVec2(
origin.x + bx::max(0.0f, (size.x - previewSize.x) / 2),
origin.y + bx::max(0.0f, (size.y - previewSize.y) / 2)
);
if (bgfx::isValid(texture))
{
if (bgfx::isValid(m_checkerboard))
{
ImGui::SetCursorScreenPos(previewPos);
ImGui::Image(m_checkerboard, previewSize);
}
ImGui::SetCursorScreenPos(previewPos);
ImGui::Image(texture, previewSize);
}
else
{
ImU32 color = ImGui::GetColorU32(ImGuiCol_TextDisabled, 0.25f);
ImDrawList* drawList = ImGui::GetWindowDrawList();
ImVec2 p0 = previewPos;
ImVec2 p1 = ImVec2(p0.x + previewSize.x, p0.y + previewSize.y);
drawList->AddRect(p0, p1, color);
drawList->AddLine(p0, p1, color);
// imguiTextBoxUnformatted(size, "INVALID");
}
ImGui::SetCursorScreenPos(origin);
ImGui::Dummy(size);
};
bool update() override
{
if (!entry::processEvents(m_width, m_height, m_debug, m_reset, &m_mouseState) )
{
imguiBeginFrame(m_mouseState.m_mx
, m_mouseState.m_my
, (m_mouseState.m_buttons[entry::MouseButton::Left ] ? IMGUI_MBUT_LEFT : 0)
| (m_mouseState.m_buttons[entry::MouseButton::Right ] ? IMGUI_MBUT_RIGHT : 0)
| (m_mouseState.m_buttons[entry::MouseButton::Middle] ? IMGUI_MBUT_MIDDLE : 0)
, m_mouseState.m_mz
, uint16_t(m_width)
, uint16_t(m_height)
);
showExampleDialog(this);
ImGui::SetNextWindowPos(ImVec2(360.0f, 40.0f), ImGuiCond_FirstUseEver);
ImGui::Begin("Formats", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
float cellWidth = m_previewSize;
for (int i = 0; i < NUM_FORMATS; ++i)
{
int format = (int)bgfx::TextureFormat::Unknown + 1 + i;
ImVec2 textSize = ImGui::CalcTextSize(bimg::getName(bimg::TextureFormat::Enum(format)));
cellWidth = bx::max(cellWidth, textSize.x);
}
ImDrawList* drawList = ImGui::GetWindowDrawList();
ImGui::DragFloat("Preview Size", &m_previewSize, 1.0f, 10.0f, TEXTURE_SIZE);
ImGui::BeginTable("Formats", NUM_FORMATS_IN_ROW, ImGuiTableFlags_Borders | ImGuiTableFlags_SizingFixedFit);
for (int i = 0; i < NUM_FORMATS; ++i)
{
ImGui::TableNextColumn();
int format = (int)bgfx::TextureFormat::Unknown + 1 + i;
bool isSelected = (m_selectedFormat == format);
ImDrawListSplitter splitter;
splitter.Split(drawList, 2);
splitter.SetCurrentChannel(drawList, 1);
ImGui::BeginGroup();
ImGuiTextBuffer label;
label.append(bimg::getName(bimg::TextureFormat::Enum(format)));
imguiTextBoxUnformatted(ImVec2(cellWidth, 0.0f), label.c_str());
imguiTexturePreview(ImVec2(cellWidth, m_previewSize), m_textures[i], ImVec2(m_previewSize, m_previewSize));
ImGui::EndGroup();
splitter.SetCurrentChannel(drawList, 0);
ImGui::SetCursorScreenPos(ImGui::GetItemRectMin());
ImGui::PushID(i);
if (ImGui::Selectable("##selectable", &isSelected, ImGuiSelectableFlags_AllowItemOverlap, ImGui::GetItemRectSize()))
m_selectedFormat = bimg::TextureFormat::Enum(format);
ImGui::PopID();
splitter.Merge(drawList);
}
ImGui::EndTable();
ImGui::End();
ImGui::SetNextWindowPos(ImVec2(40.0f, 300.0f), ImGuiCond_FirstUseEver);
ImGui::Begin("Selected Format", nullptr, ImGuiWindowFlags_AlwaysAutoResize);
ImGui::Text("Format: %s", bimg::getName(m_selectedFormat));
int selectedTextureIndex = m_selectedFormat - 1 - (int)bimg::TextureFormat::Unknown;
bgfx::TextureHandle selectedTexture = BGFX_INVALID_HANDLE;
if (m_selectedFormat != bimg::TextureFormat::Unknown)
selectedTexture = m_textures[selectedTextureIndex];
imguiTexturePreview(ImVec2(TEXTURE_SIZE, TEXTURE_SIZE), selectedTexture);
ImGui::End();
imguiEndFrame();
// Set view 0 default viewport.
bgfx::setViewRect(0, 0, 0, uint16_t(m_width), uint16_t(m_height) );
// This dummy draw call is here to make sure that view 0 is cleared
// if no other draw calls are submitted to viewZ 0.
bgfx::touch(0);
// Advance to next frame. Rendering thread will be kicked to
// process submitted rendering primitives.
bgfx::frame();
return true;
}
return false;
}
entry::MouseState m_mouseState;
uint32_t m_width;
uint32_t m_height;
uint32_t m_debug;
uint32_t m_reset;
float m_previewSize = 50.0f;
bimg::TextureFormat::Enum m_selectedFormat = bimg::TextureFormat::Unknown;
bgfx::TextureHandle m_checkerboard = BGFX_INVALID_HANDLE;
bgfx::TextureHandle m_textures[NUM_FORMATS];
};
} // namespace
ENTRY_IMPLEMENT_MAIN(
ExamplePixelFormats
, "47-pixelformats"
, "Texture formats."
, "https://bkaradzic.github.io/bgfx/examples.html#pixelformats"
);