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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
View File

@@ -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))

56
src/canvas.cpp
View File

@@ -394,9 +394,8 @@ void Canvas::stroke_draw()
glDisable(GL_BLEND);
ShaderManager::use(kShader::Stroke);
ShaderManager::u_int(kShaderUniform::Tex, 0); // brush
#ifndef __IOS__
if (!ShaderManager::ext_framebuffer_fetch)
ShaderManager::u_int(kShaderUniform::TexBG, 1); // bg
#endif
ShaderManager::u_int(kShaderUniform::TexStencil, 2); // stencil
ShaderManager::u_int(kShaderUniform::TexMix, 3); // mixer
//ShaderManager::u_int(kShaderUniform::TexMixA, 4); // mixer
@@ -549,8 +548,11 @@ void Canvas::stroke_draw()
m_tmp[i].bindFramebuffer();
if (!ShaderManager::ext_framebuffer_fetch)
{
glActiveTexture(GL_TEXTURE1);
m_tex[i].bind(); // bg, copy of framebuffer (copied before drawing)
}
glm::vec2 bb_min(m_width, m_height);
glm::vec2 bb_max(0, 0);
@@ -564,12 +566,11 @@ void Canvas::stroke_draw()
glm::vec2 pad(1);
glm::ivec2 tex_pos = glm::clamp(glm::floor(bb_min) - pad , { 0, 0 }, { m_width, m_height });
glm::ivec2 tex_sz = glm::clamp(glm::ceil(bb_sz ) + pad*2.f, { 0, 0 }, (glm::vec2)(glm::ivec2(m_width, m_height) - tex_pos));
#ifndef __IOS__
glCopyTexSubImage2D(GL_TEXTURE_2D, 0,
tex_pos.x, tex_pos.y,
tex_pos.x, tex_pos.y,
tex_sz.x, tex_sz.y);
#endif
if (!ShaderManager::ext_framebuffer_fetch)
{
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, tex_pos.x, tex_pos.y,
tex_pos.x, tex_pos.y, tex_sz.x, tex_sz.y);
}
m_dirty_box[i] = glm::vec4(
glm::min(xy(m_dirty_box[i]), (glm::vec2)tex_pos),
@@ -630,8 +631,11 @@ void Canvas::stroke_draw()
m_brush_shape.draw_stroke();
*/
if (!ShaderManager::ext_framebuffer_fetch)
{
glActiveTexture(GL_TEXTURE1);
m_tex[i].unbind();
}
m_tmp[i].unbindFramebuffer();
}
@@ -1307,26 +1311,32 @@ void Canvas::export_equirectangular_thread(std::string file_path)
ShaderManager::use(kShader::TextureBlend);
ShaderManager::u_int(kShaderUniform::Tex, 0);
ShaderManager::u_int(kShaderUniform::TexA, 1);
ShaderManager::u_int(kShaderUniform::TexBG, 2);
ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
m_tmp[i].bindFramebuffer();
// clear transparent not to mess with blending modes
m_tmp[i].clear({ 1, 1, 1, 0 });
if (!ShaderManager::ext_framebuffer_fetch)
{
ShaderManager::u_int(kShaderUniform::TexBG, 2);
glActiveTexture(GL_TEXTURE2);
face.bind();
m_sampler_bg.bind(2);
}
m_sampler_bg.bind(0); // nearest
m_sampler_mask.bind(1); // linear
m_sampler_bg.bind(2);
for (auto layer_index : m_order)
{
if (!m_layers[layer_index].m_visible ||
m_layers[layer_index].m_opacity == 0.f ||
!m_layers[layer_index].m_dirty_face[i])
continue;
if (!ShaderManager::ext_framebuffer_fetch)
{
glActiveTexture(GL_TEXTURE2);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, m_width, m_height);
}
ShaderManager::u_int(kShaderUniform::BlendMode, m_layers[layer_index].m_blend_mode);
ShaderManager::u_float(kShaderUniform::Alpha, m_layers[layer_index].m_opacity);
glActiveTexture(GL_TEXTURE0);
@@ -1338,8 +1348,12 @@ void Canvas::export_equirectangular_thread(std::string file_path)
glActiveTexture(GL_TEXTURE0);
m_layers[layer_index].m_rtt[i].unbindTexture();
}
if (!ShaderManager::ext_framebuffer_fetch)
{
glActiveTexture(GL_TEXTURE2);
face.unbind();
}
// now blend with the background
glEnable(GL_BLEND);
@@ -2131,21 +2145,27 @@ Image Canvas::thumbnail_generate(int w, int h)
ShaderManager::use(kShader::TextureBlend);
ShaderManager::u_int(kShaderUniform::Tex, 0);
ShaderManager::u_int(kShaderUniform::TexA, 1);
ShaderManager::u_int(kShaderUniform::TexBG, 2);
ShaderManager::u_mat4(kShaderUniform::MVP, plane_mvp);
if (!ShaderManager::ext_framebuffer_fetch)
{
ShaderManager::u_int(kShaderUniform::TexBG, 2);
glActiveTexture(GL_TEXTURE2);
blendtex.bind();
m_sampler_bg.bind(2);
}
m_sampler_bg.bind(0); // nearest
m_sampler_mask.bind(1); // linear
m_sampler_bg.bind(2);
for (auto layer_index : m_order)
{
if (!m_layers[layer_index].m_visible ||
m_layers[layer_index].m_opacity == 0.f ||
!m_layers[layer_index].m_dirty_face[i])
continue;
if (!ShaderManager::ext_framebuffer_fetch)
{
glActiveTexture(GL_TEXTURE2);
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, w, h);
}
ShaderManager::u_int(kShaderUniform::BlendMode, m_layers[layer_index].m_blend_mode);
ShaderManager::u_float(kShaderUniform::Alpha, m_layers[layer_index].m_opacity);
glActiveTexture(GL_TEXTURE0);
@@ -2158,8 +2178,15 @@ Image Canvas::thumbnail_generate(int w, int h)
m_layers[layer_index].m_rtt[i].unbindTexture();
}
// copy the framebuffer before clearing to white
if (!ShaderManager::ext_framebuffer_fetch)
{
glActiveTexture(GL_TEXTURE2);
blendtex.unbind();
}
glActiveTexture(GL_TEXTURE0);
blendtex.bind();
// copy the content of the fb before drawing the grid
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, w, h);
// draw the grid
@@ -2173,9 +2200,8 @@ Image Canvas::thumbnail_generate(int w, int h)
ShaderManager::u_int(kShaderUniform::Tex, 0);
ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-.5f, .5f, -.5f, .5f, -1.f, 1.f));
m_sampler_mask.bind(0); // linear
glActiveTexture(GL_TEXTURE0);
blendtex.bind();
m_plane.draw_fill();
blendtex.unbind();
}

13
src/node_canvas.cpp
View File

@@ -267,9 +267,8 @@ void NodeCanvas::draw()
ShaderManager::use(kShader::TextureBlend);
ShaderManager::u_int(kShaderUniform::Tex, 0);
ShaderManager::u_int(kShaderUniform::TexA, 1);
#ifndef __IOS__
if (!ShaderManager::ext_framebuffer_fetch)
ShaderManager::u_int(kShaderUniform::TexBG, 2);
#endif
ShaderManager::u_int(kShaderUniform::BlendMode, m_canvas->m_layers[layer_index].m_blend_mode);
ShaderManager::u_float(kShaderUniform::Alpha, 1.f);
ShaderManager::u_mat4(kShaderUniform::MVP, glm::ortho(-1, 1, -1, 1));
@@ -278,19 +277,21 @@ void NodeCanvas::draw()
m_blender_rtt.bindTexture();
glActiveTexture(GL_TEXTURE1);
m_blender_rtt.bindTexture();
#ifndef __IOS__
if (!ShaderManager::ext_framebuffer_fetch)
{
glActiveTexture(GL_TEXTURE2);
m_blender_bg.bind();
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0,
m_blender_bg.size().x, m_blender_bg.size().y);
#endif
}
m_face_plane.draw_fill();
#ifndef __IOS__
if (!ShaderManager::ext_framebuffer_fetch)
{
glActiveTexture(GL_TEXTURE2);
m_blender_bg.unbind();
#endif
}
glActiveTexture(GL_TEXTURE1);
m_blender_rtt.unbindTexture();
glActiveTexture(GL_TEXTURE0);

2
src/shader.cpp
View File

@@ -4,6 +4,7 @@
std::map<kShader, Shader> ShaderManager::m_shaders;
Shader* ShaderManager::m_current;
bool ShaderManager::ext_framebuffer_fetch = false;
bool Shader::create(const char* vertex, const char* fragment)
{
@@ -157,6 +158,7 @@ GLint Shader::GetAttribLocation(const char* name)
{
return glGetAttribLocation(prog, name);
}
bool ShaderManager::create(kShader id, const char* vertex, const char* fragment)
{
m_shaders[id].name = id;

1
src/shader.h
View File

@@ -84,6 +84,7 @@ class ShaderManager
static std::map<kShader, Shader> m_shaders;
static Shader* m_current;
public:
static bool ext_framebuffer_fetch;
static bool create(kShader id, const char* vertex, const char* fragment);
static void use(kShader id);
static void use(const char* name);