Attachment 114347 Details for Bug 89590 – Reproducer

Reproducer

shared_constant_names.cc (text/plain), 2.86 KB, created by James Legg on 2015-03-16 12:45:47 UTC

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Creator: James Legg

Created: 2015-03-16 12:45:47 UTC

Size: 2.86 KB

patch

obsolete

>// Compile with
>// c++ -std=c++11 ./shared_constant_names.cc -Wall $(pkg-config --cflags --libs sdl2 gl) -o shared_constant_names
>
>#define GL_GLEXT_PROTOTYPES 1
>#include <GL/gl.h>
>#include <SDL.h>
>#include <SDL_video.h>
>#include <iostream>
>#include <cassert>
>
>const GLchar * const vertex_shader_source =
>R"foo(#version 330
>
>in vec2 in_position;
>
>void main()
>{
>	const float zs[4] = float[4](0, 0, 0, 0);
>	gl_Position = vec4(in_position, zs[int(in_position.x) % 4], 1.0);
>}
>)foo";
>
>const GLchar * const fragment_shader_source =
>R"foo(#version 330
>
>void main()
>{
>	const vec4 colours[2] = vec4[2](vec4(1, 0, 0, 0), vec4(0, 1, 0, 0));
>	gl_FragColor = colours[int(gl_FragCoord.x) % 2];
>}
>)foo";
>
>const GLfloat vertex_positions[][2] = 
>	{{-0.4f, -0.4f}, {-0.4f, 0.4f}, {0.4f, 0.4f}};
>
>int main()
>{
>	SDL_Init(SDL_INIT_VIDEO);
>	SDL_Window * const window = SDL_CreateWindow(
>		"test",
>		SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 256, 256,
>		SDL_WINDOW_OPENGL);
>	if (!window)
>	{
>		std::cerr << "Could not create window: "
>		          << SDL_GetError() << '\n';
>		return 1;
>	}
>
>	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
>	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
>	SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK,
>	                    SDL_GL_CONTEXT_PROFILE_CORE);
>	SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS,
>	                    SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG);
>
>	SDL_GLContext gl_context = SDL_GL_CreateContext(window);
>	
>	glClear(GL_COLOR_BUFFER_BIT);
>	GLuint vao;
>	glGenVertexArrays(1, &vao);
>	glBindVertexArray(vao);
>	GLuint vbo;
>	glGenBuffers(1, &vbo);
>	glBindBuffer(GL_ARRAY_BUFFER, vbo);
>	glBufferData(GL_ARRAY_BUFFER, sizeof(vertex_positions), vertex_positions, GL_STATIC_DRAW);
>	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 0, 0);
>	glEnableVertexAttribArray(0);
>	
>	const GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
>	glShaderSource(vertex_shader, 1, const_cast<const GLchar**>(&vertex_shader_source), 0);
>	glCompileShader(vertex_shader);
>	{
>		GLint is_compiled;
>		glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &is_compiled);
>		assert(is_compiled == GL_TRUE);
>	}
>
>	const GLuint fragment_shader = glCreateShader(GL_FRAGMENT_SHADER);
>	glShaderSource(fragment_shader, 1, const_cast<const GLchar**>(&fragment_shader_source), 0);
>	glCompileShader(fragment_shader);
>	{
>		GLint is_compiled;
>		glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &is_compiled);
>		assert(is_compiled == GL_TRUE);
>	}
>
>	GLuint shader_program = glCreateProgram();
>	glAttachShader(shader_program, vertex_shader);
>	glAttachShader(shader_program, fragment_shader);
>	glBindAttribLocation(shader_program, 0, "in_position");
>	glLinkProgram(shader_program);
>	{
>		GLint is_linked;
>		glGetProgramiv(shader_program, GL_LINK_STATUS, &is_linked);
>		assert(is_linked == GL_TRUE);
>	}
>	glUseProgram(shader_program);
>
>	glDrawArrays(GL_TRIANGLES, 0, 3);
>	
>	SDL_GL_DeleteContext(gl_context);
>	SDL_DestroyWindow(window);
>}

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