gl_common.c

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/**
 * \file gl_common.c
 * \brief OpenGL helper functions used by vo_gl.c and vo_gl2.c
 *
 * Common OpenGL routines.
 * Copyleft (C) Reimar Döffinger <[e-mail]>, 2005
 * Licensend under the GNU GPL v2 or later.
 * Special thanks go to the xine team and Matthias Hopf, whose video_out_opengl.c
 * gave me lots of good ideas.
 */
#include <mplaylib.h>
#include <mplaylib.h>
#include <mplaylib.h>
#include <ctype.h>
#include <math.h>
#include "gl_common.h"
#undef memcpy
#define memcpy uc_memcpy
/**
 * \defgroup glextfunctions OpenGL extension functions
 *
 * the pointers to these functions are acquired when the OpenGL
 * context is created
 * \{
 */
void (APIENTRY *GenBuffers)(GLsizei, GLuint *);
void (APIENTRY *DeleteBuffers)(GLsizei, const GLuint *);
void (APIENTRY *BindBuffer)(GLenum, GLuint);
GLvoid* (APIENTRY *MapBuffer)(GLenum, GLenum); 
GLboolean (APIENTRY *UnmapBuffer)(GLenum);
void (APIENTRY *BufferData)(GLenum, intptr_t, const GLvoid *, GLenum);
void (APIENTRY *CombinerParameterfv)(GLenum, const GLfloat *);
void (APIENTRY *CombinerParameteri)(GLenum, GLint);
void (APIENTRY *CombinerInput)(GLenum, GLenum, GLenum, GLenum, GLenum,
                               GLenum);
void (APIENTRY *CombinerOutput)(GLenum, GLenum, GLenum, GLenum, GLenum,
                                GLenum, GLenum, GLboolean, GLboolean,
                                GLboolean);
void (APIENTRY *BeginFragmentShader)(void);
void (APIENTRY *EndFragmentShader)(void);
void (APIENTRY *SampleMap)(GLuint, GLuint, GLenum);
void (APIENTRY *ColorFragmentOp2)(GLenum, GLuint, GLuint, GLuint, GLuint,
                                  GLuint, GLuint, GLuint, GLuint, GLuint);
void (APIENTRY *ColorFragmentOp3)(GLenum, GLuint, GLuint, GLuint, GLuint,
                                  GLuint, GLuint, GLuint, GLuint, GLuint,
                                  GLuint, GLuint, GLuint);
void (APIENTRY *SetFragmentShaderConstant)(GLuint, const GLfloat *);
void (APIENTRY *ActiveTexture)(GLenum);
void (APIENTRY *BindTexture)(GLenum, GLuint);
void (APIENTRY *MultiTexCoord2f)(GLenum, GLfloat, GLfloat);
void (APIENTRY *GenPrograms)(GLsizei, GLuint *);
void (APIENTRY *DeletePrograms)(GLsizei, const GLuint *);
void (APIENTRY *BindProgram)(GLenum, GLuint);
void (APIENTRY *ProgramString)(GLenum, GLenum, GLsizei, const GLvoid *);
void (APIENTRY *GetProgramiv)(GLenum, GLenum, GLint *);
void (APIENTRY *ProgramEnvParameter4f)(GLenum, GLuint, GLfloat, GLfloat,
                                       GLfloat, GLfloat);
int (APIENTRY *SwapInterval)(int);
void (APIENTRY *TexImage3D)(GLenum, GLint, GLenum, GLsizei, GLsizei, GLsizei,
                            GLint, GLenum, GLenum, const GLvoid *);
/** \} */ // end of glextfunctions group

//! \defgroup glgeneral OpenGL general helper functions

//! \defgroup glcontext OpenGL context management helper functions

//! \defgroup gltexture OpenGL texture handling helper functions

//! \defgroup glconversion OpenGL conversion helper functions

static GLint hqtexfmt;

/**
 * \brief adjusts the GL_UNPACK_ALIGNMENT to fit the stride.
 * \param stride number of bytes per line for which alignment should fit.
 * \ingroup glgeneral
 */
void glAdjustAlignment(int stride) {
  GLint gl_alignment;
  if (stride % 8 == 0)
    gl_alignment=8;
  else if (stride % 4 == 0)
    gl_alignment=4;
  else if (stride % 2 == 0)
    gl_alignment=2;
  else
    gl_alignment=1;
  glPixelStorei (GL_UNPACK_ALIGNMENT, gl_alignment);
}

struct gl_name_map_struct {
  GLint value;
  const char *name;
};

#undef MAP
#define MAP(a) {a, #a}
//! mapping table for the glValName function
static const struct gl_name_map_struct gl_name_map[] = {
  // internal format
  MAP(GL_R3_G3_B2), MAP(GL_RGB4), MAP(GL_RGB5), MAP(GL_RGB8),
  MAP(GL_RGB10), MAP(GL_RGB12), MAP(GL_RGB16), MAP(GL_RGBA2),
  MAP(GL_RGBA4), MAP(GL_RGB5_A1), MAP(GL_RGBA8), MAP(GL_RGB10_A2),
  MAP(GL_RGBA12), MAP(GL_RGBA16), MAP(GL_LUMINANCE8),

  // format
  MAP(GL_RGB), MAP(GL_RGBA), MAP(GL_RED), MAP(GL_GREEN), MAP(GL_BLUE),
  MAP(GL_ALPHA), MAP(GL_LUMINANCE), MAP(GL_LUMINANCE_ALPHA),
  MAP(GL_COLOR_INDEX),
  // rest 1.2 only
  MAP(GL_BGR), MAP(GL_BGRA),

  //type
  MAP(GL_BYTE), MAP(GL_UNSIGNED_BYTE), MAP(GL_SHORT), MAP(GL_UNSIGNED_SHORT),
  MAP(GL_INT), MAP(GL_UNSIGNED_INT), MAP(GL_FLOAT), MAP(GL_DOUBLE),
  MAP(GL_2_BYTES), MAP(GL_3_BYTES), MAP(GL_4_BYTES),
  // rest 1.2 only
  MAP(GL_UNSIGNED_BYTE_3_3_2), MAP(GL_UNSIGNED_BYTE_2_3_3_REV),
  MAP(GL_UNSIGNED_SHORT_5_6_5), MAP(GL_UNSIGNED_SHORT_5_6_5_REV),
  MAP(GL_UNSIGNED_SHORT_4_4_4_4), MAP(GL_UNSIGNED_SHORT_4_4_4_4_REV),
  MAP(GL_UNSIGNED_SHORT_5_5_5_1), MAP(GL_UNSIGNED_SHORT_1_5_5_5_REV),
  MAP(GL_UNSIGNED_INT_8_8_8_8), MAP(GL_UNSIGNED_INT_8_8_8_8_REV),
  MAP(GL_UNSIGNED_INT_10_10_10_2), MAP(GL_UNSIGNED_INT_2_10_10_10_REV),
  {0, 0}
};
#undef MAP

/**
 * \brief return the name of an OpenGL constant
 * \param value the constant
 * \return name of the constant or "Unknown format!"
 * \ingroup glgeneral
 */
const char *glValName(GLint value)
{
  int i = 0;

  while (gl_name_map[i].name) {
    if (gl_name_map[i].value == value)
      return gl_name_map[i].name;
    i++;
  }
  return "Unknown format!";
}

//! always return this format as internal texture format in glFindFormat
#define TEXTUREFORMAT_ALWAYS GL_RGB8
#undef TEXTUREFORMAT_ALWAYS

/**
 * \brief find the OpenGL settings coresponding to format.
 *
 * All parameters may be NULL.
 * \param fmt MPlayer format to analyze.
 * \param bpp [OUT] bits per pixel of that format.
 * \param gl_texfmt [OUT] internal texture format that fits the
 * image format, not necessarily the best for performance.
 * \param gl_format [OUT] OpenGL format for this image format.
 * \param gl_type [OUT] OpenGL type for this image format.
 * \return 1 if format is supported by OpenGL, 0 if not.
 * \ingroup gltexture
 */
int glFindFormat(uint32_t fmt, int *bpp, GLint *gl_texfmt,
                  GLenum *gl_format, GLenum *gl_type)
{
  int supported = 1;
  int dummy1;
  GLenum dummy2;
  GLint dummy3;
  if (bpp == NULL) bpp = &dummy1;
  if (gl_texfmt == NULL) gl_texfmt = &dummy3;
  if (gl_format == NULL) gl_format = &dummy2;
  if (gl_type == NULL) gl_type = &dummy2;
  
  *bpp = IMGFMT_IS_BGR(fmt)?IMGFMT_BGR_DEPTH(fmt):IMGFMT_RGB_DEPTH(fmt);
  *gl_texfmt = 3;
  switch (fmt) {
    case IMGFMT_RGB24:
      *gl_format = GL_RGB;
      *gl_type = GL_UNSIGNED_BYTE;
      break;
    case IMGFMT_RGBA:
      *gl_texfmt = 4;
      *gl_format = GL_RGBA;
      *gl_type = GL_UNSIGNED_BYTE;
      break;
    case IMGFMT_YV12:
      supported = 0; // no native YV12 support
    case IMGFMT_Y800:
    case IMGFMT_Y8:
      *gl_texfmt = 1;
      *bpp = 8;
      *gl_format = GL_LUMINANCE;
      *gl_type = GL_UNSIGNED_BYTE;
      break;
#if 0
    // we do not support palettized formats, although the format the
    // swscale produces works
    case IMGFMT_RGB8:
      gl_format = GL_RGB;
      gl_type = GL_UNSIGNED_BYTE_2_3_3_REV;
      break;
#endif
    case IMGFMT_RGB15:
      *gl_format = GL_RGBA;
      *gl_type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
      break;
    case IMGFMT_RGB16:
      *gl_format = GL_RGB;
      *gl_type = GL_UNSIGNED_SHORT_5_6_5_REV;
      break;
#if 0
    case IMGFMT_BGR8:
      // special case as red and blue have a differen number of bits.
      // GL_BGR and GL_UNSIGNED_BYTE_3_3_2 isn't supported at least
      // by nVidia drivers, and in addition would give more bits to
      // blue than to red, which isn't wanted
      gl_format = GL_RGB;
      gl_type = GL_UNSIGNED_BYTE_3_3_2;
      break;
#endif
    case IMGFMT_BGR15:
      *gl_format = GL_BGRA;
      *gl_type = GL_UNSIGNED_SHORT_1_5_5_5_REV;
      break;
    case IMGFMT_BGR16:
      *gl_format = GL_RGB;
      *gl_type = GL_UNSIGNED_SHORT_5_6_5;
      break;
    case IMGFMT_BGR24:
      *gl_format = GL_BGR;
      *gl_type = GL_UNSIGNED_BYTE;
      break;
    case IMGFMT_BGRA:
      *gl_texfmt = 4;
      *gl_format = GL_BGRA;
      *gl_type = GL_UNSIGNED_BYTE;
      break;
    default:
      *gl_texfmt = 4;
      *gl_format = GL_RGBA;
      *gl_type = GL_UNSIGNED_BYTE;
      supported = 0;
  }
#ifdef TEXTUREFORMAT_ALWAYS
  *gl_texfmt = TEXTUREFORMAT_ALWAYS;
#endif
  return supported;
}

static void *setNull(const GLubyte *s) {
  return NULL;
}

typedef struct {
  void **funcptr;
  const char *extstr;
  const char *funcnames[7];
} extfunc_desc_t;

static const extfunc_desc_t extfuncs[] = {
  {(void **)&GenBuffers, NULL, {"glGenBuffers", "glGenBuffersARB", NULL}},
  {(void **)&DeleteBuffers, NULL, {"glDeleteBuffers", "glDeleteBuffersARB", NULL}},
  {(void **)&BindBuffer, NULL, {"glBindBuffer", "glBindBufferARB", NULL}},
  {(void **)&MapBuffer, NULL, {"glMapBuffer", "glMapBufferARB", NULL}},
  {(void **)&UnmapBuffer, NULL, {"glUnmapBuffer", "glUnmapBufferARB", NULL}},
  {(void **)&BufferData, NULL, {"glBufferData", "glBufferDataARB", NULL}},
  {(void **)&CombinerParameterfv, "NV_register_combiners", {"glCombinerParameterfv", "glCombinerParameterfvNV", NULL}},
  {(void **)&CombinerParameteri, "NV_register_combiners", {"glCombinerParameteri", "glCombinerParameteriNV", NULL}},
  {(void **)&CombinerInput, "NV_register_combiners", {"glCombinerInput", "glCombinerInputNV", NULL}},
  {(void **)&CombinerOutput, "NV_register_combiners", {"glCombinerOutput", "glCombinerOutputNV", NULL}},
  {(void **)&BeginFragmentShader, "ATI_fragment_shader", {"glBeginFragmentShaderATI", NULL}},
  {(void **)&EndFragmentShader, "ATI_fragment_shader", {"glEndFragmentShaderATI", NULL}},
  {(void **)&SampleMap, "ATI_fragment_shader", {"glSampleMapATI", NULL}},
  {(void **)&ColorFragmentOp2, "ATI_fragment_shader", {"glColorFragmentOp2ATI", NULL}},
  {(void **)&ColorFragmentOp3, "ATI_fragment_shader", {"glColorFragmentOp3ATI", NULL}},
  {(void **)&SetFragmentShaderConstant, "ATI_fragment_shader", {"glSetFragmentShaderConstantATI", NULL}},
  {(void **)&ActiveTexture, NULL, {"glActiveTexture", "glActiveTextureARB", NULL}},
  {(void **)&BindTexture, NULL, {"glBindTexture", "glBindTextureARB", "glBindTextureEXT", NULL}},
  {(void **)&MultiTexCoord2f, NULL, {"glMultiTexCoord2f", "glMultiTexCoord2fARB", NULL}},
  {(void **)&GenPrograms, "_program", {"glGenProgramsARB", NULL}},
  {(void **)&DeletePrograms, "_program", {"glDeleteProgramsARB", NULL}},
  {(void **)&BindProgram, "_program", {"glBindProgramARB", NULL}},
  {(void **)&ProgramString, "_program", {"glProgramStringARB", NULL}},
  {(void **)&GetProgramiv, "_program", {"glGetProgramivARB", NULL}},
  {(void **)&ProgramEnvParameter4f, "_program", {"glProgramEnvParameter4fARB", NULL}},
  {(void **)&SwapInterval, "_swap_control", {"glXSwapInterval", "glXSwapIntervalEXT", "glXSwapIntervalSGI", "wglSwapInterval", "wglSwapIntervalEXT", "wglSwapIntervalSGI", NULL}},
  {(void **)&TexImage3D, NULL, {"glTexImage3D", NULL}},
  {NULL}
};

/**
 * \brief find the function pointers of some useful OpenGL extensions
 * \param getProcAddress function to resolve function names, may be NULL
 * \param ext2 an extra extension string
 */
static void getFunctions(void *(*getProcAddress)(const GLubyte *),
                         const char *ext2) {
  const extfunc_desc_t *dsc;
  const char *extensions = (const char *)glGetString(GL_EXTENSIONS);
  char *allexts;
  if (!extensions) extensions = "";
  if (!ext2) ext2 = "";
  allexts = malloc(strlen(extensions) + strlen(ext2) + 2);
  strcpy(allexts, extensions);
  strcat(allexts, " ");
  strcat(allexts, ext2);
  mp_msg(MSGT_VO, MSGL_V, "OpenGL extensions string:\n%s\n", allexts);
  if (!getProcAddress)
    getProcAddress = setNull;
  for (dsc = extfuncs; dsc->funcptr; dsc++) {
    void *ptr = NULL;
    int i;
    if (!dsc->extstr || strstr(allexts, dsc->extstr)) {
      for (i = 0; !ptr && dsc->funcnames[i]; i++)
        ptr = getProcAddress((const GLubyte *)dsc->funcnames[i]);
    }
    *(dsc->funcptr) = ptr;
  }
  if (strstr(allexts, "_texture_float"))
    hqtexfmt = GL_RGB32F;
  else if (strstr(allexts, "NV_float_buffer"))
    hqtexfmt = GL_FLOAT_RGB32_NV;
  else
    hqtexfmt = GL_RGB16;
  free(allexts);
}

/**
 * \brief create a texture and set some defaults
 * \param target texture taget, usually GL_TEXTURE_2D
 * \param fmt internal texture format
 * \param filter filter used for scaling, e.g. GL_LINEAR
 * \param w texture width
 * \param h texture height
 * \param val luminance value to fill texture with
 * \ingroup gltexture
 */
void glCreateClearTex(GLenum target, GLenum fmt, GLint filter,
                      int w, int h, unsigned char val) {
  GLfloat fval = (GLfloat)val / 255.0;
  GLfloat border[4] = {fval, fval, fval, fval};
  GLenum clrfmt = (fmt == GL_ALPHA) ? GL_ALPHA : GL_LUMINANCE;
  char *init = malloc(w * h);
  memset(init, val, w * h);
  glAdjustAlignment(w);
  glPixelStorei(GL_UNPACK_ROW_LENGTH, w);
  glTexImage2D(target, 0, fmt, w, h, 0, clrfmt, GL_UNSIGNED_BYTE, init);
  glTexParameterf(target, GL_TEXTURE_PRIORITY, 1.0);
  glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filter);
  glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filter);
  glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
  glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
  // Border texels should not be used with CLAMP_TO_EDGE
  // We set a sane default anyway.
  glTexParameterfv(target, GL_TEXTURE_BORDER_COLOR, border);
  free(init);
}

/**
 * \brief skips whitespace and comments
 * \param f file to read from
 */
static void ppm_skip(FILE *f) {
  int c, comment = 0;
  do {
    c = fgetc(f);
    if (c == '#')
      comment = 1;
    if (c == '\n')
      comment = 0;
  } while (c != EOF && (isspace(c) || comment));
  if (c != EOF)
    ungetc(c, f);
}

#define MAXDIM (16 * 1024)

/**
 * \brief creates a texture from a PPM file
 * \param target texture taget, usually GL_TEXTURE_2D
 * \param fmt internal texture format, 0 for default
 * \param filter filter used for scaling, e.g. GL_LINEAR
 * \param f file to read PPM from
 * \param width [out] width of texture
 * \param height [out] height of texture
 * \param maxval [out] maxval value from PPM file
 * \return 0 on error, 1 otherwise
 * \ingroup gltexture
 */
int glCreatePPMTex(GLenum target, GLenum fmt, GLint filter,
                   FILE *f, int *width, int *height, int *maxval) {
  unsigned w, h, m, val, bpp;
  char *data;
  ppm_skip(f);
  if (fgetc(f) != 'P' || fgetc(f) != '6')
    return 0;
  ppm_skip(f);
  if (fscanf(f, "%u", &w) != 1)
    return 0;