git.sesse.net Git - movit/blob - flat_input.cpp

   1 #include <string.h>
   2 #include <assert.h>
   3 #include <GL/glew.h>
   4
   5 #include "effect_util.h"
   6 #include "flat_input.h"
   7 #include "resource_pool.h"
   8 #include "util.h"
   9
  10 using namespace std;
  11
  12 namespace movit {
  13
  14 FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format, GLenum type, unsigned width, unsigned height)
  15         : image_format(image_format),
  16           pixel_format(pixel_format),
  17           type(type),
  18           pbo(0),
  19           texture_num(0),
  20           output_linear_gamma(false),
  21           needs_mipmaps(false),
  22           width(width),
  23           height(height),
  24           pitch(width),
  25           pixel_data(NULL)
  26 {
  27         assert(type == GL_FLOAT || type == GL_HALF_FLOAT || type == GL_UNSIGNED_BYTE);
  28         register_int("output_linear_gamma", &output_linear_gamma);
  29         register_int("needs_mipmaps", &needs_mipmaps);
  30 }
  31
  32 FlatInput::~FlatInput()
  33 {
  34         if (texture_num != 0) {
  35                 resource_pool->release_2d_texture(texture_num);
  36         }
  37 }
  38
  39 void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  40 {
  41         glActiveTexture(GL_TEXTURE0 + *sampler_num);
  42         check_error();
  43
  44         if (texture_num == 0) {
  45                 // Translate the input format to OpenGL's enums.
  46                 GLint internal_format;
  47                 GLenum format;
  48                 if (type == GL_FLOAT) {
  49                         if (pixel_format == FORMAT_RG) {
  50                                 internal_format = GL_RG32F;
  51                         } else {
  52                                 internal_format = GL_RGBA32F;
  53                         }
  54                 } else if (type == GL_HALF_FLOAT) {
  55                         if (pixel_format == FORMAT_RG) {
  56                                 internal_format = GL_RG16F;
  57                         } else {
  58                                 internal_format = GL_RGBA16F;
  59                         }
  60                 } else if (output_linear_gamma) {
  61                         assert(type == GL_UNSIGNED_BYTE);
  62                         internal_format = GL_SRGB8_ALPHA8;
  63                 } else {
  64                         assert(type == GL_UNSIGNED_BYTE);
  65                         internal_format = GL_RGBA8;
  66                 }
  67                 if (pixel_format == FORMAT_RGB) {
  68                         format = GL_RGB;
  69                 } else if (pixel_format == FORMAT_RGBA_PREMULTIPLIED_ALPHA ||
  70                            pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
  71                         format = GL_RGBA;
  72                 } else if (pixel_format == FORMAT_BGR) {
  73                         format = GL_BGR;
  74                 } else if (pixel_format == FORMAT_BGRA_PREMULTIPLIED_ALPHA ||
  75                            pixel_format == FORMAT_BGRA_POSTMULTIPLIED_ALPHA) {
  76                         format = GL_BGRA;
  77                 } else if (pixel_format == FORMAT_GRAYSCALE) {
  78                         format = GL_LUMINANCE;
  79                 } else if (pixel_format == FORMAT_RG) {
  80                         format = GL_RG;
  81                 } else {
  82                         assert(false);
  83                 }
  84
  85                 // (Re-)upload the texture.
  86                 texture_num = resource_pool->create_2d_texture(internal_format, width, height);
  87                 glBindTexture(GL_TEXTURE_2D, texture_num);
  88                 check_error();
  89                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
  90                 check_error();
  91                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
  92                 check_error();
  93                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  94                 check_error();
  95                 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
  96                 check_error();
  97                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, pixel_data);
  98                 check_error();
  99                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 100                 check_error();
 101                 if (needs_mipmaps) {
 102                         glGenerateMipmap(GL_TEXTURE_2D);
 103                         check_error();
 104                 }
 105                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 106                 check_error();
 107                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 108                 check_error();
 109                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 110                 check_error();
 111                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 112                 check_error();
 113         } else {
 114                 glBindTexture(GL_TEXTURE_2D, texture_num);
 115                 check_error();
 116         }
 117
 118         // Bind it to a sampler.
 119         set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
 120         ++*sampler_num;
 121 }
 122
 123 string FlatInput::output_fragment_shader()
 124 {
 125         return read_file("flat_input.frag");
 126 }
 127
 128 void FlatInput::invalidate_pixel_data()
 129 {
 130         if (texture_num != 0) {
 131                 resource_pool->release_2d_texture(texture_num);
 132                 texture_num = 0;
 133         }
 134 }
 135
 136 }  // namespace movit