static const char *get_proc_cmdline()
{
static bool s_inited = false;
static vogl::vector<char> s_buf;
if (!s_inited)
{
s_inited = true;
FILE *pFile = vogl_fopen("/proc/self/cmdline", "rb");
if (pFile)
{
for (;;)
{
int c = vogl_fgetc(pFile);
if (c < 0)
break;
s_buf.push_back(static_cast<char>(c));
}
vogl_fclose(pFile);
}
s_buf.push_back(0);
s_buf.push_back(0);
}
return s_buf.get_const_ptr();
}
// One multisampled source, multiple non-multisampled destinations created by method.
bool vogl_msaa_texture_splitter::split(GLenum src_target, GLuint src_texture, vogl::vector<GLuint> &dest_textures)
{
dest_textures.resize(0);
if (!m_valid)
return false;
if ((src_target != GL_TEXTURE_2D_MULTISAMPLE) && (src_target != GL_TEXTURE_2D_MULTISAMPLE_ARRAY))
return false;
GLenum dest_target = (src_target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY) ? GL_TEXTURE_2D_ARRAY : GL_TEXTURE_2D;
GL_ENTRYPOINT(glBindTexture)(src_target, src_texture);
VOGL_CHECK_GL_ERROR;
GLint mip_level = 0, base_level = 0, max_level = 0;
GLenum internal_fmt = 0;
int base_width = 0, base_height = 0, base_depth = 0, samples = 0;
GL_ENTRYPOINT(glGetTexLevelParameteriv)(src_target, base_level, GL_TEXTURE_INTERNAL_FORMAT, reinterpret_cast<GLint *>(&internal_fmt));
GL_ENTRYPOINT(glGetTexLevelParameteriv)(src_target, base_level, GL_TEXTURE_WIDTH, &base_width);
GL_ENTRYPOINT(glGetTexLevelParameteriv)(src_target, base_level, GL_TEXTURE_HEIGHT, &base_height);
GL_ENTRYPOINT(glGetTexLevelParameteriv)(src_target, base_level, GL_TEXTURE_DEPTH, &base_depth);
GL_ENTRYPOINT(glGetTexLevelParameteriv)(src_target, base_level, GL_TEXTURE_SAMPLES, &samples);
VOGL_CHECK_GL_ERROR;
if ((base_width < 1) || (base_height < 1) || (base_depth < 1) || (samples < 1))
return false;
const vogl_internal_tex_format *pInternal_tex_fmt = vogl_find_internal_texture_format(internal_fmt);
if ((!pInternal_tex_fmt) || (pInternal_tex_fmt->m_optimum_get_image_fmt == GL_NONE) || (pInternal_tex_fmt->m_optimum_get_image_type == GL_NONE))
return false;
GLenum attachment_target = GL_COLOR_ATTACHMENT0;
if ((pInternal_tex_fmt->m_comp_sizes[cTCDepth]) && (pInternal_tex_fmt->m_comp_sizes[cTCStencil]))
attachment_target = GL_DEPTH_STENCIL_ATTACHMENT;
else if (pInternal_tex_fmt->m_comp_sizes[cTCDepth])
attachment_target = GL_DEPTH_ATTACHMENT;
else if (pInternal_tex_fmt->m_comp_sizes[cTCStencil])
return false;
if (attachment_target == GL_COLOR_ATTACHMENT0)
{
GL_ENTRYPOINT(glDepthMask)(GL_FALSE);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glDisable)(GL_DEPTH_TEST);
VOGL_CHECK_GL_ERROR;
}
else
{
GL_ENTRYPOINT(glDepthMask)(GL_TRUE);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glEnable)(GL_DEPTH_TEST);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glDepthFunc)(GL_ALWAYS);
VOGL_CHECK_GL_ERROR;
}
GL_ENTRYPOINT(glDisable)(GL_STENCIL_TEST);
VOGL_CHECK_GL_ERROR;
uint32_t width = base_width << base_level;
uint32_t height = base_height << base_level;
uint32_t depth = base_depth;
uint32_t max_possible_mip_levels = utils::compute_max_mips(width, height, depth);
int num_actual_mip_levels = math::minimum<int>(max_possible_mip_levels, max_level + 1);
for (int sample_index = 0; sample_index < samples; sample_index++)
{
m_read_color_program.set_uniform("tex_sample", sample_index);
m_read_color_array_program.set_uniform("tex_sample", sample_index);
m_read_depth_program.set_uniform("tex_sample", sample_index);
m_read_depth_array_program.set_uniform("tex_sample", sample_index);
GLuint dest_texture = 0;
GL_ENTRYPOINT(glGenTextures)(1, &dest_texture);
VOGL_CHECK_GL_ERROR;
dest_textures.push_back(dest_texture);
GL_ENTRYPOINT(glBindTexture)(dest_target, dest_texture);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glTexParameteri)(dest_target, GL_TEXTURE_BASE_LEVEL, base_level);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glTexParameteri)(dest_target, GL_TEXTURE_MAX_LEVEL, num_actual_mip_levels - 1);
VOGL_CHECK_GL_ERROR;
int mip_width = 0, mip_height = 0, mip_depth = 0;
GL_ENTRYPOINT(glGetTexLevelParameteriv)(src_target, mip_level, GL_TEXTURE_WIDTH, &mip_width);
GL_ENTRYPOINT(glGetTexLevelParameteriv)(src_target, mip_level, GL_TEXTURE_HEIGHT, &mip_height);
GL_ENTRYPOINT(glGetTexLevelParameteriv)(src_target, mip_level, GL_TEXTURE_DEPTH, &mip_depth);
if ((vogl_check_gl_error()) || (mip_width < 1) || (mip_height < 1) || (mip_depth < 1))
goto failure;
VOGL_ASSERT(mip_depth == base_depth);
VOGL_NOTE_UNUSED(mip_depth);
vogl::vector<uint8_t> ones;
ones.resize(static_cast<uint32_t>(vogl_get_image_size(pInternal_tex_fmt->m_optimum_get_image_fmt, pInternal_tex_fmt->m_optimum_get_image_type, mip_width, mip_height, mip_depth)));
ones.set_all(255);
if (src_target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY)
{
GL_ENTRYPOINT(glTexImage3D)(dest_target,
mip_level,
internal_fmt,
mip_width,
mip_height,
base_depth,
0,
pInternal_tex_fmt->m_optimum_get_image_fmt,
pInternal_tex_fmt->m_optimum_get_image_type,
ones.get_ptr());
VOGL_CHECK_GL_ERROR;
}
else
{
GL_ENTRYPOINT(glTexImage2D)(dest_target,
mip_level,
internal_fmt,
mip_width,
mip_height,
0,
pInternal_tex_fmt->m_optimum_get_image_fmt,
pInternal_tex_fmt->m_optimum_get_image_type,
ones.get_ptr());
VOGL_CHECK_GL_ERROR;
}
for (int layer = 0; layer < base_depth; layer++)
{
// Create FBO
GLuint fbo_handle = 0;
GL_ENTRYPOINT(glGenFramebuffers)(1, &fbo_handle);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glBindFramebuffer)(GL_DRAW_FRAMEBUFFER, fbo_handle);
VOGL_CHECK_GL_ERROR;
if (dest_target == GL_TEXTURE_2D_ARRAY)
{
GL_ENTRYPOINT(glFramebufferTextureLayer)(GL_DRAW_FRAMEBUFFER, attachment_target, dest_texture, mip_level, layer);
VOGL_CHECK_GL_ERROR;
}
else
{
GL_ENTRYPOINT(glFramebufferTexture2D)(GL_DRAW_FRAMEBUFFER, attachment_target, dest_target, dest_texture, mip_level);
VOGL_CHECK_GL_ERROR;
}
if (attachment_target == GL_COLOR_ATTACHMENT0)
{
GLenum draw_buf = GL_COLOR_ATTACHMENT0;
GL_ENTRYPOINT(glDrawBuffers)(1, &draw_buf);
VOGL_CHECK_GL_ERROR;
}
else
{
GL_ENTRYPOINT(glDrawBuffer)(GL_NONE);
VOGL_CHECK_GL_ERROR;
}
GLenum fbo_status = GL_ENTRYPOINT(glCheckFramebufferStatus)(GL_DRAW_FRAMEBUFFER);
VOGL_CHECK_GL_ERROR;
bool status = false;
if (fbo_status == GL_FRAMEBUFFER_COMPLETE)
{
// This method reads from a multisampled texture, which does NOT support GL_SKIP_DECODE_EXT on these targets.
// Instead, we enable sRGB writes to work around this. The source and dest use the same formats, and if the dest is not sRGB then the source shouldn't be.
GL_ENTRYPOINT(glDisable)(GL_FRAMEBUFFER_SRGB);
VOGL_CHECK_GL_ERROR;
if (attachment_target == GL_COLOR_ATTACHMENT0)
{
GLint encoding = 0;
GL_ENTRYPOINT(glGetFramebufferAttachmentParameteriv)(GL_DRAW_FRAMEBUFFER, attachment_target, GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING, &encoding);
VOGL_CHECK_GL_ERROR;
if (encoding == GL_SRGB)
{
GL_ENTRYPOINT(glEnable)(GL_FRAMEBUFFER_SRGB);
VOGL_CHECK_GL_ERROR;
}
}
// Render quad to FBO
GL_ENTRYPOINT(glViewport)(0, 0, mip_width, mip_height);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glClearColor)(1.0f, 0.3f, 1.0f, 1.0f);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glClearDepth)(.25f);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glClearStencil)(64);
VOGL_CHECK_GL_ERROR;
if (attachment_target == GL_COLOR_ATTACHMENT0)
{
GL_ENTRYPOINT(glClear)(GL_COLOR_BUFFER_BIT);
VOGL_CHECK_GL_ERROR;
}
else if (attachment_target == GL_DEPTH_ATTACHMENT)
{
GL_ENTRYPOINT(glClear)(GL_DEPTH_BUFFER_BIT);
VOGL_CHECK_GL_ERROR;
}
else
{
GL_ENTRYPOINT(glClear)(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
VOGL_CHECK_GL_ERROR;
}
vogl_quad_vertex quad_tri_verts[3*2];
memcpy(quad_tri_verts, get_quad_tri_verts(), sizeof(quad_tri_verts));
for (uint32_t i = 0; i < 6; i++)
{
quad_tri_verts[i].m_uv0[0] *= mip_width;
quad_tri_verts[i].m_uv0[1] *= mip_height;
quad_tri_verts[i].m_uv0[2] = 1.0f * layer;
}
GL_ENTRYPOINT(glBufferData)(GL_ARRAY_BUFFER, sizeof(quad_tri_verts), quad_tri_verts, GL_STATIC_DRAW);
VOGL_CHECK_GL_ERROR;
if (attachment_target == GL_COLOR_ATTACHMENT0)
{
GL_ENTRYPOINT(glUseProgram)((src_target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY) ? m_read_color_array_program.get_handle() : m_read_color_program.get_handle());
VOGL_CHECK_GL_ERROR;
}
else
{
GL_ENTRYPOINT(glUseProgram)((src_target == GL_TEXTURE_2D_MULTISAMPLE_ARRAY) ? m_read_depth_array_program.get_handle() : m_read_depth_program.get_handle());
VOGL_CHECK_GL_ERROR;
}
GL_ENTRYPOINT(glDrawArrays)(GL_TRIANGLES, 0, 6);
VOGL_CHECK_GL_ERROR;
status = true;
} // fbo_status
// Delete FBO
GL_ENTRYPOINT(glBindFramebuffer)(GL_DRAW_FRAMEBUFFER, 0);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glDeleteFramebuffers)(1, &fbo_handle);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glDrawBuffer)(GL_FRONT_LEFT);
VOGL_CHECK_GL_ERROR;
if (!status)
goto failure;
} // layer
} // sample_index
GL_ENTRYPOINT(glBindTexture)(src_target, 0);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glBindTexture)(dest_target, 0);
VOGL_CHECK_GL_ERROR;
return true;
failure:
GL_ENTRYPOINT(glBindTexture)(src_target, 0);
VOGL_CHECK_GL_ERROR;
GL_ENTRYPOINT(glBindTexture)(dest_target, 0);
VOGL_CHECK_GL_ERROR;
if (dest_textures.size())
{
GL_ENTRYPOINT(glDeleteTextures)(dest_textures.size(), dest_textures.get_ptr());
VOGL_CHECK_GL_ERROR;
dest_textures.resize(0);
}
return false;
}