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Diffstat (limited to '3rdparty/glfw/source/examples/offscreen.c')
| -rw-r--r-- | 3rdparty/glfw/source/examples/offscreen.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/3rdparty/glfw/source/examples/offscreen.c b/3rdparty/glfw/source/examples/offscreen.c deleted file mode 100644 index b7cd2fd..0000000 --- a/3rdparty/glfw/source/examples/offscreen.c +++ /dev/null @@ -1,178 +0,0 @@ -//======================================================================== -// Offscreen rendering example -// Copyright (c) Camilla Löwy <[email protected]> -// -// This software is provided 'as-is', without any express or implied -// warranty. In no event will the authors be held liable for any damages -// arising from the use of this software. -// -// Permission is granted to anyone to use this software for any purpose, -// including commercial applications, and to alter it and redistribute it -// freely, subject to the following restrictions: -// -// 1. The origin of this software must not be misrepresented; you must not -// claim that you wrote the original software. If you use this software -// in a product, an acknowledgment in the product documentation would -// be appreciated but is not required. -// -// 2. Altered source versions must be plainly marked as such, and must not -// be misrepresented as being the original software. -// -// 3. This notice may not be removed or altered from any source -// distribution. -// -//======================================================================== - -#define GLAD_GL_IMPLEMENTATION -#include <glad/gl.h> -#define GLFW_INCLUDE_NONE -#include <GLFW/glfw3.h> - -#if USE_NATIVE_OSMESA - #define GLFW_EXPOSE_NATIVE_OSMESA - #include <GLFW/glfw3native.h> -#endif - -#include "linmath.h" - -#include <stdlib.h> -#include <stdio.h> - -#define STB_IMAGE_WRITE_IMPLEMENTATION -#include <stb_image_write.h> - -static const struct -{ - float x, y; - float r, g, b; -} vertices[3] = -{ - { -0.6f, -0.4f, 1.f, 0.f, 0.f }, - { 0.6f, -0.4f, 0.f, 1.f, 0.f }, - { 0.f, 0.6f, 0.f, 0.f, 1.f } -}; - -static const char* vertex_shader_text = -"#version 110\n" -"uniform mat4 MVP;\n" -"attribute vec3 vCol;\n" -"attribute vec2 vPos;\n" -"varying vec3 color;\n" -"void main()\n" -"{\n" -" gl_Position = MVP * vec4(vPos, 0.0, 1.0);\n" -" color = vCol;\n" -"}\n"; - -static const char* fragment_shader_text = -"#version 110\n" -"varying vec3 color;\n" -"void main()\n" -"{\n" -" gl_FragColor = vec4(color, 1.0);\n" -"}\n"; - -static void error_callback(int error, const char* description) -{ - fprintf(stderr, "Error: %s\n", description); -} - -int main(void) -{ - GLFWwindow* window; - GLuint vertex_buffer, vertex_shader, fragment_shader, program; - GLint mvp_location, vpos_location, vcol_location; - float ratio; - int width, height; - mat4x4 mvp; - char* buffer; - - glfwSetErrorCallback(error_callback); - - glfwInitHint(GLFW_COCOA_MENUBAR, GLFW_FALSE); - - if (!glfwInit()) - exit(EXIT_FAILURE); - - glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2); - glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0); - glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); - - window = glfwCreateWindow(640, 480, "Simple example", NULL, NULL); - if (!window) - { - glfwTerminate(); - exit(EXIT_FAILURE); - } - - glfwMakeContextCurrent(window); - gladLoadGL(glfwGetProcAddress); - - // NOTE: OpenGL error checks have been omitted for brevity - - glGenBuffers(1, &vertex_buffer); - glBindBuffer(GL_ARRAY_BUFFER, vertex_buffer); - glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW); - - vertex_shader = glCreateShader(GL_VERTEX_SHADER); - glShaderSource(vertex_shader, 1, &vertex_shader_text, NULL); - glCompileShader(vertex_shader); - - fragment_shader = glCreateShader(GL_FRAGMENT_SHADER); - glShaderSource(fragment_shader, 1, &fragment_shader_text, NULL); - glCompileShader(fragment_shader); - - program = glCreateProgram(); - glAttachShader(program, vertex_shader); - glAttachShader(program, fragment_shader); - glLinkProgram(program); - - mvp_location = glGetUniformLocation(program, "MVP"); - vpos_location = glGetAttribLocation(program, "vPos"); - vcol_location = glGetAttribLocation(program, "vCol"); - - glEnableVertexAttribArray(vpos_location); - glVertexAttribPointer(vpos_location, 2, GL_FLOAT, GL_FALSE, - sizeof(vertices[0]), (void*) 0); - glEnableVertexAttribArray(vcol_location); - glVertexAttribPointer(vcol_location, 3, GL_FLOAT, GL_FALSE, - sizeof(vertices[0]), (void*) (sizeof(float) * 2)); - - glfwGetFramebufferSize(window, &width, &height); - ratio = width / (float) height; - - glViewport(0, 0, width, height); - glClear(GL_COLOR_BUFFER_BIT); - - mat4x4_ortho(mvp, -ratio, ratio, -1.f, 1.f, 1.f, -1.f); - - glUseProgram(program); - glUniformMatrix4fv(mvp_location, 1, GL_FALSE, (const GLfloat*) mvp); - glDrawArrays(GL_TRIANGLES, 0, 3); - glFinish(); - -#if USE_NATIVE_OSMESA - glfwGetOSMesaColorBuffer(window, &width, &height, NULL, (void**) &buffer); -#else - buffer = calloc(4, width * height); - glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, buffer); -#endif - - // Write image Y-flipped because OpenGL - stbi_write_png("offscreen.png", - width, height, 4, - buffer + (width * 4 * (height - 1)), - -width * 4); - -#if USE_NATIVE_OSMESA - // Here is where there's nothing -#else - free(buffer); -#endif - - glfwDestroyWindow(window); - - glfwTerminate(); - exit(EXIT_SUCCESS); -} - |