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

   1 #include <string.h>
   2 #include <assert.h>
   3 #include <epoxy/gl.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_in, GLenum type, unsigned width, unsigned height)
  15         : image_format(image_format),
  16           type(type),
  17           pbo(0),
  18           texture_num(0),
  19           output_linear_gamma(false),
  20           needs_mipmaps(false),
  21           width(width),
  22           height(height),
  23           pitch(width),
  24           pixel_data(NULL),
  25           fixup_swap_rb(false),
  26           fixup_red_to_grayscale(false)
  27 {
  28         assert(type == GL_FLOAT || type == GL_HALF_FLOAT || type == GL_UNSIGNED_SHORT || type == GL_UNSIGNED_BYTE);
  29         register_int("output_linear_gamma", &output_linear_gamma);
  30         register_int("needs_mipmaps", &needs_mipmaps);
  31
  32         // Some types are not supported in all GL versions (e.g. GLES),
  33         // and will corrected into the right format in the shader.
  34         switch (pixel_format_in) {
  35         case FORMAT_BGRA_PREMULTIPLIED_ALPHA:
  36                 pixel_format = FORMAT_RGBA_PREMULTIPLIED_ALPHA;
  37                 fixup_swap_rb = true;
  38                 break;
  39         case FORMAT_BGRA_POSTMULTIPLIED_ALPHA:
  40                 pixel_format = FORMAT_RGBA_POSTMULTIPLIED_ALPHA;
  41                 fixup_swap_rb = true;
  42                 break;
  43         case FORMAT_BGR:
  44                 pixel_format = FORMAT_RGB;
  45                 fixup_swap_rb = true;
  46                 break;
  47         case FORMAT_GRAYSCALE:
  48                 pixel_format = FORMAT_R;
  49                 fixup_red_to_grayscale = true;
  50                 break;
  51         default:
  52                 pixel_format = pixel_format_in;
  53                 break;
  54         }
  55 }
  56
  57 FlatInput::~FlatInput()
  58 {
  59         if (texture_num != 0) {
  60                 resource_pool->release_2d_texture(texture_num);
  61         }
  62 }
  63
  64 void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  65 {
  66         glActiveTexture(GL_TEXTURE0 + *sampler_num);
  67         check_error();
  68
  69         if (texture_num == 0) {
  70                 // Translate the input format to OpenGL's enums.
  71                 GLint internal_format;
  72                 GLenum format;
  73                 if (type == GL_FLOAT) {
  74                         if (pixel_format == FORMAT_R) {
  75                                 internal_format = GL_R32F;
  76                         } else if (pixel_format == FORMAT_RG) {
  77                                 internal_format = GL_RG32F;
  78                         } else if (pixel_format == FORMAT_RGB) {
  79                                 internal_format = GL_RGB32F;
  80                         } else {
  81                                 internal_format = GL_RGBA32F;
  82                         }
  83                 } else if (type == GL_HALF_FLOAT) {
  84                         if (pixel_format == FORMAT_R) {
  85                                 internal_format = GL_R16F;
  86                         } else if (pixel_format == FORMAT_RG) {
  87                                 internal_format = GL_RG16F;
  88                         } else if (pixel_format == FORMAT_RGB) {
  89                                 internal_format = GL_RGB16F;
  90                         } else {
  91                                 internal_format = GL_RGBA16F;
  92                         }
  93                 } else if (type == GL_UNSIGNED_SHORT) {
  94                         if (pixel_format == FORMAT_R) {
  95                                 internal_format = GL_R16;
  96                         } else if (pixel_format == FORMAT_RG) {
  97                                 internal_format = GL_RG16;
  98                         } else if (pixel_format == FORMAT_RGB) {
  99                                 internal_format = GL_RGB16;
 100                         } else {
 101                                 internal_format = GL_RGBA16;
 102                         }
 103                 } else if (output_linear_gamma) {
 104                         assert(type == GL_UNSIGNED_BYTE);
 105                         internal_format = GL_SRGB8_ALPHA8;
 106                 } else {
 107                         assert(type == GL_UNSIGNED_BYTE);
 108                         if (pixel_format == FORMAT_R) {
 109                                 internal_format = GL_R8;
 110                         } else if (pixel_format == FORMAT_RG) {
 111                                 internal_format = GL_RG8;
 112                         } else if (pixel_format == FORMAT_RGB) {
 113                                 internal_format = GL_RGB8;
 114                         } else {
 115                                 internal_format = GL_RGBA8;
 116                         }
 117                 }
 118                 if (pixel_format == FORMAT_RGB) {
 119                         format = GL_RGB;
 120                 } else if (pixel_format == FORMAT_RGBA_PREMULTIPLIED_ALPHA ||
 121                            pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
 122                         format = GL_RGBA;
 123                 } else if (pixel_format == FORMAT_RG) {
 124                         format = GL_RG;
 125                 } else if (pixel_format == FORMAT_R) {
 126                         format = GL_RED;
 127                 } else {
 128                         assert(false);
 129                 }
 130
 131                 // (Re-)upload the texture.
 132                 texture_num = resource_pool->create_2d_texture(internal_format, width, height);
 133                 glBindTexture(GL_TEXTURE_2D, texture_num);
 134                 check_error();
 135                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
 136                 check_error();
 137                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
 138                 check_error();
 139                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 140                 check_error();
 141                 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
 142                 check_error();
 143                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, pixel_data);
 144                 check_error();
 145                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 146                 check_error();
 147                 if (needs_mipmaps) {
 148                         glGenerateMipmap(GL_TEXTURE_2D);
 149                         check_error();
 150                 }
 151                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 152                 check_error();
 153                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 154                 check_error();
 155                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 156                 check_error();
 157                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 158                 check_error();
 159         } else {
 160                 glBindTexture(GL_TEXTURE_2D, texture_num);
 161                 check_error();
 162         }
 163
 164         // Bind it to a sampler.
 165         set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
 166         ++*sampler_num;
 167 }
 168
 169 string FlatInput::output_fragment_shader()
 170 {
 171         char buf[256];
 172         sprintf(buf, "#define FIXUP_SWAP_RB %d\n#define FIXUP_RED_TO_GRAYSCALE %d\n",
 173                 fixup_swap_rb, fixup_red_to_grayscale);
 174         return buf + read_file("flat_input.frag");
 175 }
 176
 177 void FlatInput::invalidate_pixel_data()
 178 {
 179         if (texture_num != 0) {
 180                 resource_pool->release_2d_texture(texture_num);
 181                 texture_num = 0;
 182         }
 183 }
 184
 185 }  // namespace movit