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GLES2: Added GL_EXT_frag_depth support.

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This commit is contained in:
bkaradzic 2013-12-13 23:06:28 -08:00
parent 96558381a4
commit ee8a277774
1 changed files with 53 additions and 0 deletions
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53
src/renderer_gl.cpp
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@ -251,6 +251,7 @@ namespace bgfx
EXT_blend_color,
EXT_blend_minmax,
EXT_blend_subtract,
EXT_frag_depth,
EXT_framebuffer_blit,
EXT_framebuffer_sRGB,
EXT_occlusion_query_boolean,
@ -276,6 +277,7 @@ namespace bgfx
OES_compressed_ETC1_RGB8_texture,
OES_depth24,
OES_depth_texture,
OES_fragment_precision_high,
OES_get_program_binary,
OES_read_format,
OES_rgb8_rgba8,
@ -327,6 +329,7 @@ namespace bgfx
{ "GL_EXT_blend_color", BGFX_CONFIG_RENDERER_OPENGL >= 31, true },
{ "GL_EXT_blend_minmax", BGFX_CONFIG_RENDERER_OPENGL >= 31, true },
{ "GL_EXT_blend_subtract", BGFX_CONFIG_RENDERER_OPENGL >= 31, true },
{ "GL_EXT_frag_depth", false, true }, // GLES2 extension.
{ "GL_EXT_framebuffer_blit", BGFX_CONFIG_RENDERER_OPENGL >= 31, true },
{ "GL_EXT_framebuffer_sRGB", false, true },
{ "GL_EXT_occlusion_query_boolean", false, true },
@ -352,6 +355,7 @@ namespace bgfx
{ "GL_OES_compressed_ETC1_RGB8_texture", false, true },
{ "GL_OES_depth24", false, true },
{ "GL_OES_depth_texture", false, true },
{ "GL_OES_fragment_precision_high", false, true },
{ "GL_OES_get_program_binary", false, true },
{ "GL_OES_read_format", false, true },
{ "GL_OES_rgb8_rgba8", false, true },
@ -1801,6 +1805,13 @@ namespace bgfx
return ptr;
}
void strins(char* _str, const char* _insert)
{
size_t len = strlen(_insert);
memmove(&_str[len], _str, strlen(_str) );
memcpy(_str, _insert, len);
}
void Shader::create(GLenum _type, Memory* _mem)
{
m_id = glCreateShader(_type);
@ -1826,6 +1837,8 @@ namespace bgfx
|| findMatch(code, "fwidth")
);
bool usesFragDepth = findMatch(code, "gl_FragDepth");
bool usesTexture3D = s_extension[Extension::OES_texture_3D].m_supported &&
( findMatch(code, "texture3D")
|| findMatch(code, "texture3DProj")
@ -1834,6 +1847,7 @@ namespace bgfx
);
if (usesDerivatives
|| usesFragDepth
|| usesTexture3D)
{
size_t codeLen = strlen(code);
@ -1846,6 +1860,28 @@ namespace bgfx
writeString(&writer, "#extension GL_OES_standard_derivatives : enable\n");
}
bool insertFragDepth = false;
if (usesFragDepth)
{
if (s_extension[Extension::EXT_frag_depth].m_supported)
{
writeString(&writer
, "#extension GL_EXT_frag_depth : enable\n"
"#define gl_FragDepth gl_FragDepthEXT\n"
);
char str[128];
bx::snprintf(str, BX_COUNTOF(str), "%s float gl_FragDepthEXT;\n"
, s_extension[Extension::OES_fragment_precision_high].m_supported ? "highp" : "mediump"
);
writeString(&writer, str);
}
else
{
insertFragDepth = true;
}
}
if (usesTexture3D)
{
writeString(&writer, "#extension GL_OES_texture_3D : enable\n");
@ -1855,6 +1891,23 @@ namespace bgfx
bx::write(&writer, '\0');
code = temp;
if (insertFragDepth)
{
char* entry = strstr(temp, "void main ()");
if (NULL != entry)
{
const char* brace = strstr(entry, "{");
if (NULL != brace)
{
const char* end = bx::strmb(brace, '{', '}');
if (NULL != end)
{
strins(temp, "float gl_FragDepth = 0.0;\n");
}
}
}
}
}
#endif // BGFX_CONFIG_RENDERER_OPENGLES2