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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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49
wpigui/src/main/native/opengl3/wpigui_opengl3.cpp
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@@ -12,13 +12,14 @@
#include <imgui.h>
#include <imgui_impl_glfw.h>
#include <imgui_impl_opengl3.h>
#include <stb_image.h>
#include "wpigui.h"
#include "wpigui_internal.h"
using namespace wpi::gui;
static bool gPlatformValid = false;
namespace wpi {
void gui::PlatformCreateContext() {}
@@ -73,6 +74,7 @@ bool gui::PlatformInitRenderer() {
#endif
ImGui_ImplOpenGL3_Init(glsl_version);
gPlatformValid = true;
return true;
}
@@ -92,15 +94,25 @@ void gui::PlatformRenderFrame() {
glfwSwapBuffers(gContext->window);
}
void gui::PlatformShutdown() { ImGui_ImplOpenGL3_Shutdown(); }
void gui::PlatformShutdown() {
gPlatformValid = false;
ImGui_ImplOpenGL3_Shutdown();
}
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 GLenum GLPixelFormat(PixelFormat format) {
switch (format) {
case kPixelRGBA:
return GL_RGBA;
case kPixelBGRA:
return GL_BGRA;
default:
return GL_RGBA;
}
}
ImTextureID gui::CreateTexture(PixelFormat format, int width, int height,
const unsigned char* data) {
if (!gPlatformValid) return nullptr;
// Create a OpenGL texture identifier
GLuint texture;
@@ -113,18 +125,23 @@ bool gui::LoadTextureFromFile(const char* filename, ImTextureID* out_texture,
// Upload pixels into texture
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA,
GL_UNSIGNED_BYTE, data);
stbi_image_free(data);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
GLPixelFormat(format), GL_UNSIGNED_BYTE, data);
*out_texture = reinterpret_cast<ImTextureID>(static_cast<uintptr_t>(texture));
if (out_width) *out_width = width;
if (out_height) *out_height = height;
return reinterpret_cast<ImTextureID>(static_cast<uintptr_t>(texture));
}
return true;
void gui::UpdateTexture(ImTextureID texture, PixelFormat format, int width,
int height, const unsigned char* data) {
GLuint glTexture = static_cast<GLuint>(reinterpret_cast<uintptr_t>(texture));
if (glTexture == 0) return;
glBindTexture(GL_TEXTURE_2D, glTexture);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, GLPixelFormat(format),
GL_UNSIGNED_BYTE, data);
}
void gui::DeleteTexture(ImTextureID texture) {
if (!gPlatformValid) return;
GLuint glTexture = static_cast<GLuint>(reinterpret_cast<uintptr_t>(texture));
if (glTexture != 0) glDeleteTextures(1, &glTexture);
}