mirror of
https://github.com/PixarAnimationStudios/OpenSubdiv
synced 2024-12-02 08:00:10 +00:00
299 lines
8.1 KiB
C++
299 lines
8.1 KiB
C++
//
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// Copyright 2015 Pixar
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//
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// Licensed under the Apache License, Version 2.0 (the "Apache License")
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// with the following modification; you may not use this file except in
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// compliance with the Apache License and the following modification to it:
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// Section 6. Trademarks. is deleted and replaced with:
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//
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// 6. Trademarks. This License does not grant permission to use the trade
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// names, trademarks, service marks, or product names of the Licensor
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// and its affiliates, except as required to comply with Section 4(c) of
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// the License and to reproduce the content of the NOTICE file.
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//
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// You may obtain a copy of the Apache License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the Apache License with the above modification is
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// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the Apache License for the specific
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// language governing permissions and limitations under the Apache License.
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//
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#include <sstream>
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#include <string>
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#include <cstring>
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#include <vector>
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#include "glUtils.h"
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#define STB_IMAGE_WRITE_IMPLEMENTATION 1
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#include "stb_image_write.h"
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#include <GLFW/glfw3.h>
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#if _MSC_VER
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#define snprintf _snprintf
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#endif
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namespace GLUtils {
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// Note that glewIsSupported is required here for Core profile, glewGetExtension
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// and GLEW_extension_name will not work on all drivers.
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#ifdef OSD_USES_GLEW
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#define IS_SUPPORTED(x) \
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(glewIsSupported(x) == GL_TRUE)
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#endif
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static void
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_argParseBool(bool *ret, const char *lbl, int i, int argc, char **argv)
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{
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if (i < argc-1) {
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if (!strcmp(argv[i+1], "on")) {
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*ret = true;
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} else if (!strcmp(argv[i+1], "off")) {
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*ret = false;
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} else {
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fprintf(stderr, "Unknown setting for %s: %s\n", lbl, argv[i+1]);
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exit(1);
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}
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} else {
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fprintf(stderr,
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"Please specify \"on\" or \"off\" for %s.\n", lbl);
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exit(1);
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}
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}
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void
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SetMinimumGLVersion(int argc, char ** argv) {
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#if defined(__APPLE__)
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// Here 3.2 is the minimum GL version supported, GLFW will allocate a
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// higher version if possible. This works on OS X, but instead limits
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// the version to 3.2 on Linux. On Linux & Windows, specifying no
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// version hint should use the highest version available.
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//
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// http://www.glfw.org/faq.html#how-do-i-create-an-opengl-30-context
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// http://www.glfw.org/faq.html#what-versions-of-opengl-are-supported-by-glfw
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bool coreProfile = true;
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bool forwardCompat = true;
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bool versionSet = true;
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int major = 3;
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int minor = 2;
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#else
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bool coreProfile = false;
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bool forwardCompat = false;
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bool versionSet = false;
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int major = 4;
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int minor = 2;
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#endif
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for (int i = 1; i < argc; ++i) {
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if (!strcmp(argv[i], "-glCoreProfile")) {
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_argParseBool(&coreProfile, argv[i], i, argc, argv);
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}
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if (!strcmp(argv[i], "-glForwardCompat")) {
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_argParseBool(&forwardCompat, argv[i], i, argc, argv);
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}
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if (!strcmp(argv[i], "-glVersion")) {
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if (i < argc-1) {
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char *versionStr = argv[i+1];
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size_t len = strlen(versionStr);
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if (len == 3 && versionStr[1] == '.' &&
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versionStr[0] >= '0' && versionStr[0] <= '9' &&
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versionStr[2] >= '0' && versionStr[2] <= '9') {
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major = versionStr[0] - '0';
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minor = versionStr[2] - '0';
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versionSet = true;
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} else {
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fprintf(stderr,
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"Invalid version number: %s, please specify a number "
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"in the format M.n, e.g., -glVersion 4.2.\n",
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versionStr);
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exit(1);
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}
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} else {
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fprintf(stderr,
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"Please specify a version number for glVersion "
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"in the form M.n, e.g., -glVersion 4.2.\n");
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exit(1);
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}
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}
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}
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#ifdef CORE_PROFILE
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if (coreProfile) {
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glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
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}
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if (forwardCompat) {
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glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
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}
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#endif
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if (versionSet) {
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glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, major);
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glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, minor);
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}
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}
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void
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PrintGLVersion() {
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std::cout << glGetString(GL_VENDOR) << "\n";
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std::cout << glGetString(GL_RENDERER) << "\n";
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std::cout << glGetString(GL_VERSION) << "\n";
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int i;
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std::cout << "Init OpenGL ";
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glGetIntegerv(GL_MAJOR_VERSION, &i);
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std::cout << i << ".";
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glGetIntegerv(GL_MINOR_VERSION, &i);
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std::cout << i << "\n";
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}
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void
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CheckGLErrors(std::string const & where) {
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GLuint err;
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while ((err = glGetError()) != GL_NO_ERROR) {
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std::cerr << "GL error: "
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<< (where.empty() ? "" : where + " ")
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<< err << "\n";
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}
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}
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GLuint
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CompileShader(GLenum shaderType, const char *source) {
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GLuint shader = glCreateShader(shaderType);
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glShaderSource(shader, 1, &source, NULL);
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glCompileShader(shader);
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GLint status;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if (status == GL_FALSE) {
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GLchar emsg[40960];
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glGetShaderInfoLog(shader, sizeof(emsg), 0, emsg);
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fprintf(stderr, "Error compiling GLSL shader: %s\n", emsg);
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return 0;
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}
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return shader;
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}
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void
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WriteScreenshot(int width, int height) {
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std::vector<unsigned char> data(width*height*4 /*RGBA*/);
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glPixelStorei(GL_PACK_ALIGNMENT, 1);
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glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, &data[0]);
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static int counter=0;
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char fname[64];
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snprintf(fname, 64, "screenshot.%d.png", counter++);
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// flip vertical
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stbi_write_png(fname, width, height, 4, &data[width*4*(height-1)], -width*4);
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fprintf(stdout, "Saved %s\n", fname);
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}
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bool
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SupportsAdaptiveTessellation() {
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#ifdef OSD_USES_GLEW
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return IS_SUPPORTED("GL_ARB_tessellation_shader");
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#else
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#if defined(GL_ARB_tessellation_shader) || defined(GL_VERSION_4_0)
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return true;
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#else
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return false;
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#endif
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#endif
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}
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void GetMajorMinorVersion(int *major, int *minor){
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const GLubyte *ver = glGetString(GL_SHADING_LANGUAGE_VERSION);
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if (!ver){
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*major = -1;
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*minor = -1;
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}
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else{
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std::stringstream ss;
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ss << std::string(ver, ver + 1) << " " << std::string(ver + 2, ver + 3);
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ss >> *major;
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ss >> *minor;
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}
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}
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std::string
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GetShaderVersion(){
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std::string shader_version;
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int major, minor;
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GetMajorMinorVersion(&major, &minor);
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int version_number = major * 10 + minor;
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switch (version_number){
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case 20:
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shader_version = "110";
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break;
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case 21:
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shader_version = "120";
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break;
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case 30:
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shader_version = "130";
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break;
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case 31:
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shader_version = "140";
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break;
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case 32:
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shader_version = "150";
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break;
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default:
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std::stringstream ss;
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ss << version_number;
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shader_version = ss.str() + "0";
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break;
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}
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return shader_version;
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}
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/* Generates the version defintion needed by the glsl shaders based on the
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* opengl string
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*/
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std::string GetShaderVersionInclude(){
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return "#version " + GetShaderVersion() + "\n";
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}
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bool GL_ARBSeparateShaderObjectsOrGL_VERSION_4_1(){
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#if defined(OSD_USES_GLEW)
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return IS_SUPPORTED("GL_ARB_separate_shader_objects") ||
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(GLEW_VERSION_4_1 && IS_SUPPORTED("GL_ARB_tessellation_shader"));
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#else
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#if defined(GL_ARB_separate_shader_objects) || defined(GL_VERSION_4_1)
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return true;
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#else
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return false;
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#endif
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#endif
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}
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bool GL_ARBComputeShaderOrGL_VERSION_4_3() {
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#if defined(OSD_USES_GLEW)
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return IS_SUPPORTED("GL_ARB_compute_shader") ||
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(GLEW_VERSION_4_3);
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#else
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#if defined(GL_ARB_compute_shader) || defined(GL_VERSION_4_3)
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return true;
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#else
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return false;
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#endif
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#endif
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}
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#undef IS_SUPPORTED
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} // namesapce GLUtils
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