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         register_uniform_sampler2d("tex", &uniform_tex);
  32
  33         // Some types are not supported in all GL versions (e.g. GLES),
  34         // and will corrected into the right format in the shader.
  35         switch (pixel_format_in) {
  36         case FORMAT_BGRA_PREMULTIPLIED_ALPHA:
  37                 pixel_format = FORMAT_RGBA_PREMULTIPLIED_ALPHA;
  38                 fixup_swap_rb = true;
  39                 break;
  40         case FORMAT_BGRA_POSTMULTIPLIED_ALPHA:
  41                 pixel_format = FORMAT_RGBA_POSTMULTIPLIED_ALPHA;
  42                 fixup_swap_rb = true;
  43                 break;
  44         case FORMAT_BGR:
  45                 pixel_format = FORMAT_RGB;
  46                 fixup_swap_rb = true;
  47                 break;
  48         case FORMAT_GRAYSCALE:
  49                 pixel_format = FORMAT_R;
  50                 fixup_red_to_grayscale = true;
  51                 break;
  52         default:
  53                 pixel_format = pixel_format_in;
  54                 break;
  55         }
  56 }
  57
  58 FlatInput::~FlatInput()
  59 {
  60         if (texture_num != 0) {
  61                 resource_pool->release_2d_texture(texture_num);
  62         }
  63 }
  64
  65 void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  66 {
  67         glActiveTexture(GL_TEXTURE0 + *sampler_num);
  68         check_error();
  69
  70         if (texture_num == 0) {
  71                 // Translate the input format to OpenGL's enums.
  72                 GLint internal_format;
  73                 GLenum format;
  74                 if (type == GL_FLOAT) {
  75                         if (pixel_format == FORMAT_R) {
  76                                 internal_format = GL_R32F;
  77                         } else if (pixel_format == FORMAT_RG) {
  78                                 internal_format = GL_RG32F;
  79                         } else if (pixel_format == FORMAT_RGB) {
  80                                 internal_format = GL_RGB32F;
  81                         } else {
  82                                 internal_format = GL_RGBA32F;
  83                         }
  84                 } else if (type == GL_HALF_FLOAT) {
  85                         if (pixel_format == FORMAT_R) {
  86                                 internal_format = GL_R16F;
  87                         } else if (pixel_format == FORMAT_RG) {
  88                                 internal_format = GL_RG16F;
  89                         } else if (pixel_format == FORMAT_RGB) {
  90                                 internal_format = GL_RGB16F;
  91                         } else {
  92                                 internal_format = GL_RGBA16F;
  93                         }
  94                 } else if (type == GL_UNSIGNED_SHORT) {
  95                         if (pixel_format == FORMAT_R) {
  96                                 internal_format = GL_R16;
  97                         } else if (pixel_format == FORMAT_RG) {
  98                                 internal_format = GL_RG16;
  99                         } else if (pixel_format == FORMAT_RGB) {
 100                                 internal_format = GL_RGB16;
 101                         } else {
 102                                 internal_format = GL_RGBA16;
 103                         }
 104                 } else if (output_linear_gamma) {
 105                         assert(type == GL_UNSIGNED_BYTE);
 106                         if (pixel_format == FORMAT_RGB) {
 107                                 internal_format = GL_SRGB8;
 108                         } else if (pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
 109                                 internal_format = GL_SRGB8_ALPHA8;
 110                         } else {
 111                                 assert(false);
 112                         }
 113                 } else {
 114                         assert(type == GL_UNSIGNED_BYTE);
 115                         if (pixel_format == FORMAT_R) {
 116                                 internal_format = GL_R8;
 117                         } else if (pixel_format == FORMAT_RG) {
 118                                 internal_format = GL_RG8;
 119                         } else if (pixel_format == FORMAT_RGB) {
 120                                 internal_format = GL_RGB8;
 121                         } else {
 122                                 internal_format = GL_RGBA8;
 123                         }
 124                 }
 125                 if (pixel_format == FORMAT_RGB) {
 126                         format = GL_RGB;
 127                 } else if (pixel_format == FORMAT_RGBA_PREMULTIPLIED_ALPHA ||
 128                            pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
 129                         format = GL_RGBA;
 130                 } else if (pixel_format == FORMAT_RG) {
 131                         format = GL_RG;
 132                 } else if (pixel_format == FORMAT_R) {
 133                         format = GL_RED;
 134                 } else {
 135                         assert(false);
 136                 }
 137
 138                 // (Re-)upload the texture.
 139                 texture_num = resource_pool->create_2d_texture(internal_format, width, height);
 140                 glBindTexture(GL_TEXTURE_2D, texture_num);
 141                 check_error();
 142                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
 143                 check_error();
 144                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
 145                 check_error();
 146                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 147                 check_error();
 148                 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
 149                 check_error();
 150                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, pixel_data);
 151                 check_error();
 152                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 153                 check_error();
 154                 if (needs_mipmaps) {
 155                         glGenerateMipmap(GL_TEXTURE_2D);
 156                         check_error();
 157                 }
 158                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
 159                 check_error();
 160                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 161                 check_error();
 162                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 163                 check_error();
 164                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 165                 check_error();
 166         } else {
 167                 glBindTexture(GL_TEXTURE_2D, texture_num);
 168                 check_error();
 169         }
 170
 171         // Bind it to a sampler.
 172         uniform_tex = *sampler_num;
 173         ++*sampler_num;
 174 }
 175
 176 string FlatInput::output_fragment_shader()
 177 {
 178         char buf[256];
 179         sprintf(buf, "#define FIXUP_SWAP_RB %d\n#define FIXUP_RED_TO_GRAYSCALE %d\n",
 180                 fixup_swap_rb, fixup_red_to_grayscale);
 181         return buf + read_file("flat_input.frag");
 182 }
 183
 184 void FlatInput::invalidate_pixel_data()
 185 {
 186         if (texture_num != 0) {
 187                 resource_pool->release_2d_texture(texture_num);
 188                 texture_num = 0;
 189         }
 190 }
 191
 192 }  // namespace movit