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https://github.com/thorvg/thorvg.git
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64df0791df
Change the MultiCanvas code to show how to render the content of GlCanvas to a given off-screen framebuffer. issue: https://github.com/thorvg/thorvg/issues/2746
354 lines
No EOL
13 KiB
C++
354 lines
No EOL
13 KiB
C++
/*
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* Copyright (c) 2020 - 2024 the ThorVG project. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "Example.h"
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#ifdef THORVG_GL_RASTER_SUPPORT
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#include <SDL2/SDL_opengl.h>
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#endif
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#define WIDTH 1024
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#define HEIGHT 1024
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#define NUM_PER_LINE 4
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#define SIZE (WIDTH/NUM_PER_LINE)
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/************************************************************************/
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/* ThorVG Drawing Contents */
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/************************************************************************/
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void content(tvg::Canvas* canvas)
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{
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//Background
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auto bg = tvg::Shape::gen();
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bg->appendRect(0, 0, SIZE, SIZE);
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bg->fill(255, 255, 255);
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canvas->push(std::move(bg));
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char buf[PATH_MAX];
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snprintf(buf, sizeof(buf), EXAMPLE_DIR"/svg/logo.svg");
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auto picture = tvg::Picture::gen();
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if (!tvgexam::verify(picture->load(buf))) return;
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float scale;
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float shiftX = 0.0f, shiftY = 0.0f;
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float w2, h2;
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picture->size(&w2, &h2);
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if (w2 > h2) {
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scale = SIZE / w2;
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shiftY = (SIZE - h2 * scale) * 0.5f;
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} else {
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scale = SIZE / h2;
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shiftX = (SIZE - w2 * scale) * 0.5f;
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}
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picture->translate(shiftX, shiftY);
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picture->scale(scale);
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canvas->push(std::move(picture));
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}
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void mainloop()
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{
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SDL_Event event;
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auto running = true;
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while (running) {
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//SDL Event handling
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while (SDL_PollEvent(&event)) {
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switch (event.type) {
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case SDL_QUIT: {
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running = false;
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break;
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}
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case SDL_KEYUP: {
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if (event.key.keysym.sym == SDLK_ESCAPE) {
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running = false;
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}
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break;
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}
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}
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}
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}
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}
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/************************************************************************/
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/* SW Engine Specific Setup */
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/************************************************************************/
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void runSw()
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{
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auto window = SDL_CreateWindow("ThorVG Example (Software)", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIDTH, HEIGHT, SDL_WINDOW_HIDDEN);
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auto surface = SDL_GetWindowSurface(window);
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for (int counter = 0; counter < NUM_PER_LINE * NUM_PER_LINE; ++counter) {
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auto canvas = tvg::SwCanvas::gen();
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tvgexam::verify(canvas->target((uint32_t*)surface->pixels + SIZE * (counter / NUM_PER_LINE) * (surface->pitch / 4) + (counter % NUM_PER_LINE) * SIZE, surface->w, surface->pitch / 4, surface->h, tvg::SwCanvas::ARGB8888));
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content(canvas.get());
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if (tvgexam::verify(canvas->draw())) {
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tvgexam::verify(canvas->sync());
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}
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}
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SDL_ShowWindow(window);
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SDL_UpdateWindowSurface(window);
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mainloop();
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SDL_DestroyWindow(window);
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}
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/************************************************************************/
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/* GL Engine Specific Setup */
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/************************************************************************/
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#ifdef THORVG_GL_RASTER_SUPPORT
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typedef void (*PFNGLTEXIMAGE2DPROC)(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* pixels);
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typedef void (*PFNGLTEXPARAMETERIPROC)(GLenum target, GLenum pname, GLint param);
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PFNGLBINDTEXTUREEXTPROC fglBindTexture = nullptr;
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PFNGLDELETETEXTURESEXTPROC fglDeleteTextures = nullptr;
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PFNGLGENTEXTURESEXTPROC fglGenTextures = nullptr;
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PFNGLTEXIMAGE2DPROC fglTexImage2D = nullptr;
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PFNGLTEXPARAMETERIPROC fglTexParameteri = nullptr;
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PFNGLGENFRAMEBUFFERSPROC fglGenFramebuffers = nullptr;
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PFNGLBINDFRAMEBUFFERPROC fglBindFramebuffer = nullptr;
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PFNGLDELETEFRAMEBUFFERSPROC fglDeleteFramebuffers = nullptr;
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PFNGLFRAMEBUFFERTEXTURE2DPROC fglFramebufferTexture2D = nullptr;
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PFNGLBLITFRAMEBUFFERPROC fglBlitFramebuffer = nullptr;
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/* A helper class to manage OpenGL FrameBuffer creation and deletion
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Also provides a simple way to flush the framebuffer to the screen at given position */
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struct GLFrameBuffer
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{
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GLuint fbo;
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GLuint texture;
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~GLFrameBuffer()
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{
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if (fbo) fglDeleteFramebuffers(1, &fbo);
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if (texture) fglDeleteTextures(1, &texture);
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}
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GLFrameBuffer(uint32_t width, uint32_t height)
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{
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fglGenFramebuffers(1, &fbo);
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fglBindFramebuffer(GL_FRAMEBUFFER, fbo);
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fglGenTextures(1, &texture);
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fglBindTexture(GL_TEXTURE_2D, texture);
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fglTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, nullptr);
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fglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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fglTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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fglFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
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fglBindFramebuffer(GL_FRAMEBUFFER, 0);
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fglBindTexture(GL_TEXTURE_2D, 0);
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}
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void blitToScreen(uint32_t posX, uint32_t posY, uint32_t width, uint32_t height)
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{
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/* As this is a simple example, we will just blit the framebuffer to the screen
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For a real application, you should use a shader to sample the texture and draw to the screen */
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fglBindFramebuffer(GL_READ_FRAMEBUFFER, fbo);
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fglBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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fglBlitFramebuffer(0, 0, width, height, posX, posY, posX +width, posY + height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
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}
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};
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#endif
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void runGl()
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{
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#ifdef THORVG_GL_RASTER_SUPPORT
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#ifdef THORVG_GL_TARGET_GLES
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
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#else
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
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SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
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#endif
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auto window = SDL_CreateWindow("ThorVG Example (OpenGL)", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIDTH, HEIGHT, SDL_WINDOW_OPENGL | SDL_WINDOW_HIDDEN);
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auto context = SDL_GL_CreateContext(window);
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fglBindTexture = (PFNGLBINDTEXTUREEXTPROC)SDL_GL_GetProcAddress("glBindTexture");
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fglDeleteTextures = (PFNGLDELETETEXTURESEXTPROC)SDL_GL_GetProcAddress("glDeleteTextures");
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fglGenTextures = (PFNGLGENTEXTURESEXTPROC)SDL_GL_GetProcAddress("glGenTextures");
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fglTexImage2D = (PFNGLTEXIMAGE2DPROC)SDL_GL_GetProcAddress("glTexImage2D");
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fglTexParameteri = (PFNGLTEXPARAMETERIPROC)SDL_GL_GetProcAddress("glTexParameteri");
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fglBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC)SDL_GL_GetProcAddress("glBindFramebuffer");
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fglGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC)SDL_GL_GetProcAddress("glGenFramebuffers");
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fglDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC)SDL_GL_GetProcAddress("glDeleteFramebuffers");
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fglFramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC)SDL_GL_GetProcAddress("glFramebufferTexture2D");
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fglBlitFramebuffer = (PFNGLBLITFRAMEBUFFERPROC)SDL_GL_GetProcAddress("glBlitFramebuffer");
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// Create the framebuffer which the GlCanvas can render to
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// Since the example is just a simple demo, and only run the rendering function once
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// we can just create one framebuffer
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GLFrameBuffer glFbo{SIZE, SIZE};
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for (int counter = 0; counter < NUM_PER_LINE * NUM_PER_LINE; ++counter) {
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auto canvas = tvg::GlCanvas::gen();
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// Pass the framebuffer id to the GlCanvas
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tvgexam::verify(canvas->target(glFbo.fbo, SIZE, SIZE));
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content(canvas.get());
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if (tvgexam::verify(canvas->draw())) {
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tvgexam::verify(canvas->sync());
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}
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// After the GlCanvas::sync() function, the content is rendered to the framebuffer
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// The texture is now ready to be blit to the screen
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auto y = (counter / NUM_PER_LINE) * SIZE;
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auto x = (counter % NUM_PER_LINE) * SIZE;
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glFbo.blitToScreen(x, y, SIZE, SIZE);
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// After the framebuffer is blit to the screen, the framebuffer and texture can be reused in the next iteration
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}
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SDL_ShowWindow(window);
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SDL_GL_SwapWindow(window);
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mainloop();
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SDL_GL_DeleteContext(context);
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SDL_DestroyWindow(window);
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#else
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cout << "Not Support OpenGL" << endl;
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#endif
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}
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/************************************************************************/
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/* WG Engine Specific Setup */
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/************************************************************************/
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void runWg()
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{
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#if 1
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cout << "Not Support WebGPU" << endl;
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#else
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#ifdef THORVG_WG_RASTER_SUPPORT
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//TODO with Drawing Target?
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auto window = SDL_CreateWindow("ThorVG Example (WebGPU)", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIDTH, HEIGHT, SDL_WINDOW_HIDDEN);
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//Here we create our WebGPU surface from the window!
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SDL_SysWMinfo windowWMInfo;
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SDL_VERSION(&windowWMInfo.version);
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SDL_GetWindowWMInfo(window, &windowWMInfo);
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//Init WebGPU
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WGPUInstanceDescriptor desc = {.nextInChain = nullptr};
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auto instance = wgpuCreateInstance(&desc);
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#if defined(SDL_VIDEO_DRIVER_COCOA)
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[windowWMInfo.info.cocoa.window.contentView setWantsLayer:YES];
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auto layer = [CAMetalLayer layer];
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[windowWMInfo.info.cocoa.window.contentView setLayer:layer];
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WGPUSurfaceDescriptorFromMetalLayer surfaceNativeDesc = {
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.chain = {nullptr, WGPUSType_SurfaceDescriptorFromMetalLayer},
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.layer = layer
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};
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#elif defined(SDL_VIDEO_DRIVER_X11)
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WGPUSurfaceDescriptorFromXlibWindow surfaceNativeDesc = {
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.chain = {nullptr, WGPUSType_SurfaceDescriptorFromXlibWindow},
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.display = windowWMInfo.info.x11.display,
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.window = windowWMInfo.info.x11.window
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};
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#elif defined(SDL_VIDEO_DRIVER_WAYLAND)
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WGPUSurfaceDescriptorFromWaylandSurface surfaceNativeDesc = {
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.chain = {nullptr, WGPUSType_SurfaceDescriptorFromWaylandSurface},
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.display = windowWMInfo.info.wl.display,
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.surface = windowWMInfo.info.wl.surface
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};
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#elif defined(SDL_VIDEO_DRIVER_WINDOWS)
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WGPUSurfaceDescriptorFromWindowsHWND surfaceNativeDesc = {
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.chain = {nullptr, WGPUSType_SurfaceDescriptorFromWindowsHWND},
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.hinstance = GetModuleHandle(nullptr),
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.hwnd = windowWMInfo.info.win.window
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};
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#endif
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WGPUSurfaceDescriptor surfaceDesc{};
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surfaceDesc.nextInChain = (const WGPUChainedStruct*)&surfaceNativeDesc;
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surfaceDesc.label = "The surface";
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auto surface = wgpuInstanceCreateSurface(instance, &surfaceDesc);
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for (int counter = 0; counter < NUM_PER_LINE * NUM_PER_LINE; ++counter) {
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auto canvas = tvg::WgCanvas::gen();
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//Set the canvas target and draw on it.
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tvgexam::verify(canvas->target(instance, surface, WIDTH, HEIGHT));
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content(canvas.get());
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if (tvgexam::verify(canvas->draw())) {
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tvgexam::verify(canvas->sync());
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}
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}
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SDL_ShowWindow(window);
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mainloop();
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wgpuInstanceRelease(instance);
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SDL_DestroyWindow(window);
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#else
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cout << "webgpu driver is not detected!" << endl;
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#endif
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#endif
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}
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/************************************************************************/
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/* Entry Point */
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/************************************************************************/
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int main(int argc, char **argv)
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{
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auto engine = tvg::CanvasEngine::Sw;
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if (argc > 1) {
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if (!strcmp(argv[1], "gl")) engine = tvg::CanvasEngine::Gl;
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if (!strcmp(argv[1], "wg")) engine = tvg::CanvasEngine::Wg;
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}
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if (tvgexam::verify(tvg::Initializer::init(4, engine))) {
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SDL_Init(SDL_INIT_VIDEO);
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if (engine == tvg::CanvasEngine::Sw) runSw();
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else if (engine == tvg::CanvasEngine::Gl) runGl();
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else if (engine == tvg::CanvasEngine::Wg) runWg();
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SDL_Quit();
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//Terminate ThorVG Engine
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tvg::Initializer::term();
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}
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return 0;
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} |