Create a class for issuing drawing commands

[libs/gl.git] / source / core / commands.cpp

diff --git a/source/core/commands.cpp b/source/core/commands.cpp
new file mode 100644 (file)
index 0000000..72b5a93
--- /dev/null
+++ b/source/core/commands.cpp
@@ -0,0 +1,70 @@
+#include <algorithm>
+#include <msp/gl/extensions/arb_direct_state_access.h>
+#include <msp/gl/extensions/arb_draw_instanced.h>
+#include <msp/gl/extensions/ext_framebuffer_blit.h>
+#include <msp/gl/extensions/ext_framebuffer_object.h>
+#include "batch.h"
+#include "commands.h"
+#include "gl.h"
+#include "pipelinestate.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+Commands::Commands():
+       pipeline_state(0)
+{ }
+
+void Commands::use_pipeline(const PipelineState &ps)
+{
+       pipeline_state = &ps;
+}
+
+void Commands::clear(BufferBits buffers)
+{
+       pipeline_state->apply();
+       glClear(buffers);
+}
+
+void Commands::draw(const Batch &batch)
+{
+       pipeline_state->apply();
+       void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
+       glDrawElements(batch.get_type(), batch.size(), batch.get_gl_index_type(), data_ptr);
+}
+
+void Commands::draw_instanced(const Batch &batch, unsigned count)
+{
+       static Require req(ARB_draw_instanced);
+
+       pipeline_state->apply();
+       void *data_ptr = reinterpret_cast<void *>(batch.get_offset());
+       glDrawElementsInstanced(batch.get_type(), batch.size(), batch.get_gl_index_type(), data_ptr, count);
+}
+
+void Commands::resolve_multisample(Framebuffer &target, BufferBits buffers)
+{
+       const Framebuffer *source = pipeline_state->get_framebuffer();
+
+       unsigned width = min(source->get_width(), target.get_width());
+       unsigned height = min(source->get_height(), target.get_height());
+
+       if(ARB_direct_state_access)
+               glBlitNamedFramebuffer(source->get_id(), target.get_id(), 0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
+       else
+       {
+               glBindFramebuffer(GL_READ_FRAMEBUFFER, source->get_id());
+               glBindFramebuffer(GL_DRAW_FRAMEBUFFER, target.get_id());
+
+               target.refresh();
+
+               glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, buffers, GL_NEAREST);
+
+               glBindFramebuffer(GL_FRAMEBUFFER, source->get_id());
+       }
+}
+
+} // namespace GL
+} // namespace Msp