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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "ui/gl/gl_helper.h" |
| 6 |
| 7 #include <string> |
| 8 |
| 9 #include "base/logging.h" |
| 10 |
| 11 namespace gfx { |
| 12 |
| 13 // static |
| 14 GLuint GLHelper::CompileShader(GLenum type, const char* src) { |
| 15 GLuint shader = glCreateShader(type); |
| 16 // Load the shader source. |
| 17 glShaderSource(shader, 1, &src, nullptr); |
| 18 // Compile the shader. |
| 19 glCompileShader(shader); |
| 20 return shader; |
| 21 } |
| 22 |
| 23 // static |
| 24 GLuint GLHelper::LoadShader(GLenum type, const char* src) { |
| 25 GLuint shader = CompileShader(type, src); |
| 26 |
| 27 // Check the compile status. |
| 28 GLint value = 0; |
| 29 glGetShaderiv(shader, GL_COMPILE_STATUS, &value); |
| 30 if (!value) { |
| 31 char buffer[1024]; |
| 32 GLsizei length = 0; |
| 33 glGetShaderInfoLog(shader, sizeof(buffer), &length, buffer); |
| 34 std::string log(buffer, length); |
| 35 DCHECK_EQ(1, value) << "Error compiling shader: " << log; |
| 36 glDeleteShader(shader); |
| 37 shader = 0; |
| 38 } |
| 39 return shader; |
| 40 } |
| 41 |
| 42 // static |
| 43 GLuint GLHelper::LinkProgram(GLuint vertex_shader, GLuint fragment_shader) { |
| 44 // Create the program object. |
| 45 GLuint program = glCreateProgram(); |
| 46 glAttachShader(program, vertex_shader); |
| 47 glAttachShader(program, fragment_shader); |
| 48 // Link the program. |
| 49 glLinkProgram(program); |
| 50 return program; |
| 51 } |
| 52 |
| 53 // static |
| 54 GLuint GLHelper::SetupProgram(GLuint vertex_shader, GLuint fragment_shader) { |
| 55 GLuint program = LinkProgram(vertex_shader, fragment_shader); |
| 56 // Check the link status. |
| 57 GLint linked = 0; |
| 58 glGetProgramiv(program, GL_LINK_STATUS, &linked); |
| 59 if (!linked) { |
| 60 char buffer[1024]; |
| 61 GLsizei length = 0; |
| 62 glGetProgramInfoLog(program, sizeof(buffer), &length, buffer); |
| 63 std::string log(buffer, length); |
| 64 DCHECK_EQ(1, linked) << "Error linking program: " << log; |
| 65 glDeleteProgram(program); |
| 66 program = 0; |
| 67 } |
| 68 return program; |
| 69 } |
| 70 |
| 71 } // namespace gfx |
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