mirror of https://github.com/vitalif/openscad
118 lines
2.8 KiB
C++
118 lines
2.8 KiB
C++
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/*
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Create an OpenGL context without creating an OpenGL Window. for Windows.
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*/
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#include "OffscreenContext.h"
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#include "printutils.h"
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#include "imageutils.h"
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#include "fbo.h"
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#include <vector>
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#include <GL/gl.h>
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using namespace std;
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struct OffscreenContext
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{
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// GLXContext openGLContext;
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int width;
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int height;
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fbo_t *fbo;
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};
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void offscreen_context_init(OffscreenContext &ctx, int width, int height)
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{
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ctx.width = width;
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ctx.height = height;
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ctx.fbo = NULL;
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}
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void glewCheck() {
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#ifdef DEBUG
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cerr << "GLEW version " << glewGetString(GLEW_VERSION) << "\n";
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cerr << (const char *)glGetString(GL_RENDERER) << "(" << (const char *)glGetString(GL_VENDOR) << ")\n"
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<< "OpenGL version " << (const char *)glGetString(GL_VERSION) << "\n";
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cerr << "Extensions: " << (const char *)glGetString(GL_EXTENSIONS) << "\n";
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if (GLEW_ARB_framebuffer_object) {
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cerr << "ARB_FBO supported\n";
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}
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if (GLEW_EXT_framebuffer_object) {
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cerr << "EXT_FBO supported\n";
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}
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if (GLEW_EXT_packed_depth_stencil) {
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cerr << "EXT_packed_depth_stencil\n";
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}
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#endif
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}
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OffscreenContext *create_offscreen_context(int w, int h)
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{
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OffscreenContext *ctx = new OffscreenContext;
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offscreen_context_init( *ctx, w, h );
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// before an FBO can be setup, a GLX context must be created
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// this call alters ctx->xDisplay and ctx->openGLContext
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// and ctx->xwindow if successfull
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cerr << "WGL not implemented\n";
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/*
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if (!create_glx_dummy_context( *ctx )) {
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return NULL;
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}
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glewInit(); //must come after Context creation and before FBO calls.
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glewCheck();
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ctx->fbo = fbo_new();
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if (!fbo_init(ctx->fbo, w, h)) {
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return NULL;
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}
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*/
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ctx = NULL;
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return ctx;
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}
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bool teardown_offscreen_context(OffscreenContext *ctx)
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{
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if (ctx) {
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fbo_unbind(ctx->fbo);
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fbo_delete(ctx->fbo);
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return true;
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}
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return false;
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}
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/*!
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Capture framebuffer from OpenGL and write it to the given filename as PNG.
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*/
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bool save_framebuffer(OffscreenContext *ctx, const char *filename)
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{
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if (!ctx || !filename) return false;
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int samplesPerPixel = 4; // R, G, B and A
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vector<GLubyte> pixels(ctx->width * ctx->height * samplesPerPixel);
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glReadPixels(0, 0, ctx->width, ctx->height, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[0]);
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// Flip it vertically - images read from OpenGL buffers are upside-down
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int rowBytes = samplesPerPixel * ctx->width;
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unsigned char *flippedBuffer = (unsigned char *)malloc(rowBytes * ctx->height);
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if (!flippedBuffer) {
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std::cerr << "Unable to allocate flipped buffer for corrected image.";
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return 1;
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}
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flip_image(&pixels[0], flippedBuffer, samplesPerPixel, ctx->width, ctx->height);
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bool writeok = write_png(filename, flippedBuffer, ctx->width, ctx->height);
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free(flippedBuffer);
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return writeok;
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}
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void bind_offscreen_context(OffscreenContext *ctx)
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{
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if (ctx) fbo_bind(ctx->fbo);
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}
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