diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/pugl_shader_demo.c (renamed from examples/pugl_gl3_demo.c) | 43 |
1 files changed, 33 insertions, 10 deletions
diff --git a/examples/pugl_gl3_demo.c b/examples/pugl_shader_demo.c index 7b2a49f..ac5fe84 100644 --- a/examples/pugl_gl3_demo.c +++ b/examples/pugl_shader_demo.c @@ -15,7 +15,7 @@ */ /** - @file pugl_gl3_demo.c An example of drawing with OpenGL 3. + @file pugl_shader_demo.c An example of drawing with OpenGL 3/4. This is an example of using OpenGL for pixel-perfect 2D drawing. It uses pixel coordinates for positions and sizes so that things work roughly like a @@ -71,6 +71,8 @@ typedef struct GLuint instanceVbo; GLuint ibo; unsigned framesDrawn; + int glMajorVersion; + int glMinorVersion; int quit; } PuglTestApp; @@ -204,6 +206,8 @@ loadShader(const char* const path) static int parseOptions(PuglTestApp* app, int argc, char** argv) { + char* endptr = NULL; + // Parse command line options app->numRects = 1024; app->opts = puglParseTestOptions(&argc, &argv); @@ -212,11 +216,24 @@ parseOptions(PuglTestApp* app, int argc, char** argv) } // Parse number of rectangles argument, if given - if (argc == 1) { - char* endptr = NULL; - + if (argc >= 1) { app->numRects = (size_t)strtol(argv[0], &endptr, 10); if (endptr != argv[0] + strlen(argv[0])) { + logError("Invalid number of rectangles: %s\n", argv[0]); + return 1; + } + } + + // Parse OpenGL major version argument, if given + if (argc >= 2) { + app->glMajorVersion = (int)strtol(argv[1], &endptr, 10); + if (endptr != argv[1] + strlen(argv[1])) { + logError("Invalid GL major version: %s\n", argv[1]); + return 1; + } else if (app->glMajorVersion == 4) { + app->glMinorVersion = 2; + } else if (app->glMajorVersion != 3) { + logError("Unsupported GL major version %d\n", app->glMajorVersion); return 1; } } @@ -241,8 +258,8 @@ setupPugl(PuglTestApp* app, const PuglRect frame) puglSetBackend(app->view, puglGlBackend()); puglSetViewHint(app->view, PUGL_USE_COMPAT_PROFILE, PUGL_FALSE); puglSetViewHint(app->view, PUGL_USE_DEBUG_CONTEXT, app->opts.errorChecking); - puglSetViewHint(app->view, PUGL_CONTEXT_VERSION_MAJOR, 3); - puglSetViewHint(app->view, PUGL_CONTEXT_VERSION_MINOR, 3); + puglSetViewHint(app->view, PUGL_CONTEXT_VERSION_MAJOR, app->glMajorVersion); + puglSetViewHint(app->view, PUGL_CONTEXT_VERSION_MINOR, app->glMinorVersion); puglSetViewHint(app->view, PUGL_RESIZABLE, app->opts.resizable); puglSetViewHint(app->view, PUGL_SAMPLES, app->opts.samples); puglSetViewHint(app->view, PUGL_DOUBLE_BUFFER, app->opts.doubleBuffer); @@ -261,8 +278,12 @@ setupGl(PuglTestApp* app) return PUGL_FAILURE; } + const char* const headerFile = (app->glMajorVersion == 3 + ? "shaders/header_330.glsl" + : "shaders/header_420.glsl"); + // Load shader sources - char* const headerSource = loadShader("shaders/header_330.glsl"); + char* const headerSource = loadShader(headerFile); char* const vertexSource = loadShader("shaders/rect.vert"); char* const fragmentSource = loadShader("shaders/rect.frag"); if (!vertexSource || !fragmentSource) { @@ -362,14 +383,16 @@ teardownGl(PuglTestApp* app) int main(int argc, char** argv) { - PuglTestApp app; - memset(&app, 0, sizeof(app)); + PuglTestApp app = {0}; + + app.glMajorVersion = 3; + app.glMinorVersion = 3; const PuglRect frame = {0, 0, defaultWidth, defaultHeight}; // Parse command line options if (parseOptions(&app, argc, argv)) { - puglPrintTestUsage("pugl_gl3_demo", "[NUM_RECTS]"); + puglPrintTestUsage("pugl_shader_demo", "[NUM_RECTS] [GL_MAJOR]"); return 1; } |