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 FlatInput::FlatInput(ImageFormat image_format, MovitPixelFormat pixel_format, GLenum type, unsigned width, unsigned height)
  13         : image_format(image_format),
  14           pixel_format(pixel_format),
  15           type(type),
  16           pbo(0),
  17           texture_num(0),
  18           finalized(false),
  19           output_linear_gamma(false),
  20           needs_mipmaps(false),
  21           width(width),
  22           height(height),
  23           pitch(width),
  24           pixel_data(NULL)
  25 {
  26         assert(type == GL_FLOAT || type == GL_UNSIGNED_BYTE);
  27         register_int("output_linear_gamma", &output_linear_gamma);
  28         register_int("needs_mipmaps", &needs_mipmaps);
  29 }
  30
  31 FlatInput::~FlatInput()
  32 {
  33         if (texture_num != 0) {
  34                 resource_pool->release_2d_texture(texture_num);
  35         }
  36 }
  37
  38 void FlatInput::finalize()
  39 {
  40         // Translate the input format to OpenGL's enums.
  41         if (type == GL_FLOAT) {
  42                 internal_format = GL_RGBA32F_ARB;
  43         } else if (output_linear_gamma) {
  44                 assert(type == GL_UNSIGNED_BYTE);
  45                 internal_format = GL_SRGB8_ALPHA8;
  46         } else {
  47                 assert(type == GL_UNSIGNED_BYTE);
  48                 internal_format = GL_RGBA8;
  49         }
  50         if (pixel_format == FORMAT_RGB) {
  51                 format = GL_RGB;
  52         } else if (pixel_format == FORMAT_RGBA_PREMULTIPLIED_ALPHA ||
  53                    pixel_format == FORMAT_RGBA_POSTMULTIPLIED_ALPHA) {
  54                 format = GL_RGBA;
  55         } else if (pixel_format == FORMAT_BGR) {
  56                 format = GL_BGR;
  57         } else if (pixel_format == FORMAT_BGRA_PREMULTIPLIED_ALPHA ||
  58                    pixel_format == FORMAT_BGRA_POSTMULTIPLIED_ALPHA) {
  59                 format = GL_BGRA;
  60         } else if (pixel_format == FORMAT_GRAYSCALE) {
  61                 format = GL_LUMINANCE;
  62         } else {
  63                 assert(false);
  64         }
  65
  66         finalized = true;
  67 }
  68
  69 void FlatInput::set_gl_state(GLuint glsl_program_num, const string& prefix, unsigned *sampler_num)
  70 {
  71         glActiveTexture(GL_TEXTURE0 + *sampler_num);
  72         check_error();
  73
  74         if (texture_num == 0) {
  75                 // (Re-)upload the texture.
  76                 texture_num = resource_pool->create_2d_texture(internal_format, width, height);
  77                 glBindTexture(GL_TEXTURE_2D, texture_num);
  78                 check_error();
  79                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
  80                 check_error();
  81                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, needs_mipmaps ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR);
  82                 check_error();
  83                 glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  84                 check_error();
  85                 glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
  86                 check_error();
  87                 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, pixel_data);
  88                 check_error();
  89                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  90                 check_error();
  91                 if (needs_mipmaps) {
  92                         glGenerateMipmap(GL_TEXTURE_2D);
  93                         check_error();
  94                 }
  95                 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
  96                 check_error();
  97                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  98                 check_error();
  99                 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 100                 check_error();
 101                 glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
 102                 check_error();
 103         } else {
 104                 glBindTexture(GL_TEXTURE_2D, texture_num);
 105                 check_error();
 106         }
 107
 108         // Bind it to a sampler.
 109         set_uniform_int(glsl_program_num, prefix, "tex", *sampler_num);
 110         ++*sampler_num;
 111 }
 112
 113 string FlatInput::output_fragment_shader()
 114 {
 115         return read_file("flat_input.frag");
 116 }
 117
 118 void FlatInput::invalidate_pixel_data()
 119 {
 120         if (texture_num != 0) {
 121                 resource_pool->release_2d_texture(texture_num);
 122                 texture_num = 0;
 123         }
 124 }