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glsl framebuffer_fetch extension check at runtime

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This commit is contained in:
omigamedev
2019-01-30 15:43:45 +01:00
parent 489036a40c
commit c55ed36f2c
5 changed files with 99 additions and 50 deletions
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31
src/app_shaders.cpp
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@@ -63,6 +63,13 @@
" return fract(sin(sn) * c);\n"\
"}\n"
#define SHADER_EXT_FB_FETCH \
"#if defined(GL_EXT_shader_framebuffer_fetch)\n"\
" #extension GL_EXT_shader_framebuffer_fetch : enable\n"\
"#elif defined(GL_ARM_shader_framebuffer_fetch)\n"\
" #extension GL_ARM_shader_framebuffer_fetch : enable\n"\
"#endif\n"
void App::initShaders()
{
static const char* shader_v =
@@ -85,9 +92,7 @@ void App::initShaders()
"}\n";
static const char* shader_blend_f =
SHADER_VERSION
"#if defined(GL_EXT_shader_framebuffer_fetch)\n"
" #extension GL_EXT_shader_framebuffer_fetch : enable\n"
"#endif\n"
SHADER_EXT_FB_FETCH
"uniform sampler2D tex;\n"
"uniform sampler2D tex_alpha;\n"
"uniform sampler2D tex_bg;\n"
@@ -103,6 +108,8 @@ void App::initShaders()
"void main() {\n"
"#if defined(GL_EXT_shader_framebuffer_fetch)\n"
" highp vec4 bg = frag;\n"
"#elif defined(GL_ARM_shader_framebuffer_fetch)\n"
" highp vec4 bg = gl_LastFragColorARM;\n"
"#else\n"
" mediump vec4 bg = texture(tex_bg, uv);\n"
"#endif\n"
@@ -357,9 +364,7 @@ void App::initShaders()
"}\n";
static const char* shader_stroke_f =
SHADER_VERSION
"#if defined(GL_EXT_shader_framebuffer_fetch)\n"
" #extension GL_EXT_shader_framebuffer_fetch : enable\n"
"#endif\n"
SHADER_EXT_FB_FETCH
"uniform mediump sampler2D tex;\n"
"uniform mediump sampler2D tex_bg;\n"
"uniform mediump sampler2D tex_stencil;\n"
@@ -388,6 +393,8 @@ void App::initShaders()
" mediump vec4 fg = vec4(col.rgb, brush_alpha * stencil);\n"
"#if defined(GL_EXT_shader_framebuffer_fetch)\n"
" mediump vec4 bg = frag;\n"
"#elif defined(GL_ARM_shader_framebuffer_fetch)\n"
" mediump vec4 bg = gl_LastFragColorARM;\n"
"#else\n"
" mediump vec4 bg = texture(tex_bg, uv2);\n"
"#endif\n"
@@ -592,6 +599,18 @@ void App::initShaders()
" }\n"
"}\n";
GLint n_exts;
glGetIntegerv(GL_NUM_EXTENSIONS, &n_exts);
for (int i = 0; i < n_exts; i++)
{
std::string ext = (const char*)glGetStringi(GL_EXTENSIONS, i);
if (ext.find("shader_framebuffer_fetch") != std::string::npos)
{
ShaderManager::ext_framebuffer_fetch = true;
}
}
LOG("Shader Extension shader_framebuffer_fetch: %s", ShaderManager::ext_framebuffer_fetch ? "enabled" : "disabled");
LOG("initializing shaders");
if (!ShaderManager::create(kShader::Texture, shader_v, shader_f))