1// Copyright (c) 2013 The Chromium OS 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 "texturetest.h"
6
7#include "base/logging.h"
8#include "base/strings/string_number_conversions.h"
9#include "base/strings/string_util.h"
10
11namespace glbench {
12
13namespace {
14
15// Vertex and fragment shader code.
16const char* kVertexShader =
17    "attribute vec4 c1;"
18    "attribute vec4 c2;"
19    "varying vec4 v1;"
20    "void main() {"
21    "  gl_Position = c1;"
22    "  v1 = c2;"
23    "}";
24
25const char* kFragmentShader =
26    "varying vec4 v1;"
27    "uniform sampler2D texture;"
28    "void main() {"
29    "  gl_FragColor = texture2D(texture, v1.xy);"
30    "}";
31
32}  // namespace
33
34bool TextureTest::Run() {
35  // Two triangles that form one pixel at 0, 0.
36  const GLfloat kVertices[8] = {
37    0.f, 0.f,
38    2.f / g_width, 0.f,
39    0.f, 2.f / g_height,
40    2.f / g_width, 2.f / g_height,
41  };
42  const GLfloat kTexCoords[8] = {
43    0.f, 0.f, 0.f, 0.f,
44    0.f, 0.f, 0.f, 0.f,
45  };
46
47  program_ = InitShaderProgram(kVertexShader, kFragmentShader);
48
49  int attr1 = glGetAttribLocation(program_, "c1");
50  glVertexAttribPointer(attr1, 2, GL_FLOAT, GL_FALSE, 0, kVertices);
51  glEnableVertexAttribArray(attr1);
52
53  int attr2 = glGetAttribLocation(program_, "c2");
54  glVertexAttribPointer(attr2, 2, GL_FLOAT, GL_FALSE, 0, kTexCoords);
55  glEnableVertexAttribArray(attr2);
56
57  int texture_sampler = glGetUniformLocation(program_, "texture");
58  glUniform1i(texture_sampler, 0);
59  glActiveTexture(GL_TEXTURE0);
60
61  glGenTextures(kNumberOfTextures, textures_);
62  for (int i = 0; i < kNumberOfTextures; ++i) {
63    glBindTexture(GL_TEXTURE_2D, textures_[i]);
64    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
65    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
66  }
67
68  // Textures formats
69  // TODO(djkurtz): Other formats such as GL_BGRA, GL_RGB, GL_BGR, ... ?
70  const GLenum kTexelFormats[] =
71     { GL_LUMINANCE, GL_RGBA }; // , GL_BGRA, GL_RGB, GL_BGR };
72  const unsigned int kTexelFormatSizes[] = { 1, 4 }; // , 4, 3, 3 };
73  const std::string kTexelFormatNames[] =
74      { "luminance", "rgba" }; // , "bgra", "rgb", "bgr" };
75
76  // Texture upload commands
77  UpdateFlavor kFlavors[] = { TEX_IMAGE, TEX_SUBIMAGE };
78  const std::string kFlavorNames[] = { "teximage2d", "texsubimage2d" };
79
80  for (unsigned int fmt = 0; fmt < arraysize(kTexelFormats); fmt++) {
81    texel_gl_format_ = kTexelFormats[fmt];
82    unsigned int texel_size = kTexelFormatSizes[fmt];
83    for (unsigned int flavor = 0; flavor < arraysize(kFlavors); flavor++) {
84      flavor_ = kFlavors[flavor];
85      const int sizes[] = { 32, 128, 256, 512, 768, 1024, 1536, 2048 };
86      for (unsigned int j = 0; j < arraysize(sizes); j++) {
87        // In hasty mode only do at most 512x512 sized problems.
88        if (g_hasty && sizes[j] > 512)
89          continue;
90
91        std::string name = std::string(Name()) + "_" +
92            kTexelFormatNames[fmt] + "_" + kFlavorNames[flavor] + "_" +
93            base::IntToString(sizes[j]);
94
95        width_ = height_ = sizes[j];
96        const unsigned int buffer_size = width_ * height_ * texel_size;
97        for (int i = 0; i < kNumberOfTextures; ++i) {
98          pixels_[i].reset(new char[buffer_size]);
99          memset(pixels_[i].get(), 255, buffer_size);
100
101          // For NPOT texture we must set GL_TEXTURE_WRAP as GL_CLAMP_TO_EDGE
102          glBindTexture(GL_TEXTURE_2D, textures_[i]);
103          glTexImage2D(GL_TEXTURE_2D, 0, texel_gl_format_, width_, height_, 0,
104                       texel_gl_format_, GL_UNSIGNED_BYTE, NULL);
105          if (glGetError() != 0) {
106            printf("# Error: Failed to allocate %dx%d %u-byte texel texture.\n",
107                   width_, height_, texel_size);
108          }
109          if (IS_NOT_POWER_OF_2(width_) || IS_NOT_POWER_OF_2(height_)) {
110            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
111            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
112          }
113        }
114        RunTest(this, name.c_str(), buffer_size, g_width, g_height, true);
115        GLenum error = glGetError();
116        if (error != GL_NO_ERROR) {
117          printf("# GL error code %d after RunTest() with %dx%d %d-byte texture.\n",
118                 error, width_, height_, texel_size);
119       }
120      }
121    }
122  }
123  for (int i = 0; i < kNumberOfTextures; ++i)
124    pixels_[i].reset();
125
126  glDeleteTextures(kNumberOfTextures, textures_);
127  glDeleteProgram(program_);
128  return true;
129}
130
131} // namespace glbench
132