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[wpigui] Refactor texture handling

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The platform-specific code now only has create, update, and delete texture.
Image reading functions have been moved to common code.

Also add pixel data functions and image data functions in addition to image
file loading.
This commit is contained in:
Peter Johnson
2020-08-29 00:16:21 -07:00
parent 007b03a2c2
commit 781afaa852
7 changed files with 391 additions and 68 deletions
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42
wpigui/src/main/native/metal/wpigui_metal.mm
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@@ -16,7 +16,6 @@
#include <imgui.h>
#include <imgui_impl_glfw.h>
#include <imgui_impl_metal.h>
#include <stb_image.h>
#include "wpigui.h"
#include "wpigui_internal.h"
@@ -32,6 +31,7 @@ struct PlatformContext {
} // namespace
static PlatformContext* gPlatformContext;
static bool gPlatformValid = false;
namespace wpi {
@@ -66,6 +66,7 @@ bool gui::PlatformInitRenderer() {
gPlatformContext->renderPassDescriptor = [MTLRenderPassDescriptor new];
gPlatformValid = true;
return true;
}
@@ -103,17 +104,26 @@ void gui::PlatformRenderFrame() {
void gui::PlatformShutdown() {
ImGui_ImplMetal_Shutdown();
gPlatformValid = false;
}
bool gui::LoadTextureFromFile(const char* filename, ImTextureID* out_texture,
int* out_width, int* out_height) {
// Load from file
int width = 0;
int height = 0;
unsigned char* data = stbi_load(filename, &width, &height, nullptr, 4);
if (!data) return false;
static inline MTLPixelFormat MetalPixelFormat(PixelFormat format) {
switch (format) {
case kPixelRGBA:
return MTLPixelFormatRGBA8Unorm;
case kPixelBGRA:
return MTLPixelFormatBGRA8Unorm;
default:
return MTLPixelFormatRGBA8Unorm;
}
}
MTLTextureDescriptor *textureDescriptor = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm width:width height:height mipmapped:NO];
ImTextureID gui::CreateTexture(PixelFormat format, int width, int height,
const unsigned char* data) {
if (!gPlatformValid) return nullptr;
MTLPixelFormat fmt = MetalPixelFormat(format);
MTLTextureDescriptor *textureDescriptor = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:fmt width:width height:height mipmapped:NO];
textureDescriptor.usage = MTLTextureUsageShaderRead;
#if TARGET_OS_OSX
textureDescriptor.storageMode = MTLStorageModeManaged;
@@ -123,16 +133,18 @@ bool gui::LoadTextureFromFile(const char* filename, ImTextureID* out_texture,
id <MTLTexture> texture = [gPlatformContext->layer.device newTextureWithDescriptor:textureDescriptor];
[texture replaceRegion:MTLRegionMake2D(0, 0, width, height) mipmapLevel:0 withBytes:data bytesPerRow:width * 4];
*out_texture = (__bridge_retained void *)texture;
*out_width = width;
*out_height = height;
stbi_image_free(data);
return (__bridge_retained void *)texture;
}
return true;
void gui::UpdateTexture(ImTextureID texture, PixelFormat, int width,
int height, const unsigned char* data) {
if (!texture) return;
id <MTLTexture> mtlTexture = (__bridge id <MTLTexture>)texture;
[mtlTexture replaceRegion:MTLRegionMake2D(0, 0, width, height) mipmapLevel:0 withBytes:data bytesPerRow:width * 4];
}
void gui::DeleteTexture(ImTextureID texture) {
if (!texture) return;
if (!gPlatformValid || !texture) return;
id <MTLTexture> mtlTexture = (__bridge_transfer id <MTLTexture>)texture;
(void)mtlTexture;
}