1 files changed, 70 insertions, 0 deletions
diff --git a/sway/desktop/fx_renderer/fx_framebuffer.c b/sway/desktop/fx_renderer/fx_framebuffer.c
new file mode 100644
index 00000000..db6f8928
--- /dev/null
+++ b/sway/desktop/fx_renderer/fx_framebuffer.c
@@ -0,0 +1,70 @@
+#include "log.h"
+#include "sway/desktop/fx_renderer/fx_framebuffer.h"
+
+void fx_framebuffer_bind(struct fx_framebuffer *buffer, GLsizei width, GLsizei height) {
+	glBindFramebuffer(GL_FRAMEBUFFER, buffer->fb);
+	glViewport(0, 0, width, height);
+}
+
+void fx_framebuffer_create(struct wlr_output *output, struct fx_framebuffer *buffer, bool bind) {
+	bool firstAlloc = false;
+
+	// Create a new framebuffer
+	if (buffer->fb == (uint32_t) -1) {
+		glGenFramebuffers(1, &buffer->fb);
+		firstAlloc = true;
+	}
+
+	if (buffer->texture.id == 0) {
+		firstAlloc = true;
+		glGenTextures(1, &buffer->texture.id);
+		glBindTexture(GL_TEXTURE_2D, buffer->texture.id);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	}
+
+	int width, height;
+	wlr_output_transformed_resolution(output, &width, &height);
+
+	if (firstAlloc || buffer->texture.width != width || buffer->texture.height != height) {
+		glBindTexture(GL_TEXTURE_2D, buffer->texture.id);
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
+
+		glBindFramebuffer(GL_FRAMEBUFFER, buffer->fb);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+				buffer->texture.id, 0);
+		buffer->texture.target = GL_TEXTURE_2D;
+		buffer->texture.has_alpha = false;
+		buffer->texture.width = width;
+		buffer->texture.height = height;
+
+		GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+		if (status != GL_FRAMEBUFFER_COMPLETE) {
+			sway_log(SWAY_ERROR, "Framebuffer incomplete, couldn't create! (FB status: %i)", status);
+			return;
+		}
+		sway_log(SWAY_DEBUG, "Framebuffer created, status %i", status);
+	}
+
+	// Bind the default framebuffer
+	glBindTexture(GL_TEXTURE_2D, 0);
+	if (bind) {
+		fx_framebuffer_bind(buffer, width, height);
+	}
+}
+
+void fx_framebuffer_release(struct fx_framebuffer *buffer) {
+	if (buffer->fb != (uint32_t) -1 && buffer->fb) {
+		glDeleteFramebuffers(1, &buffer->fb);
+	}
+	buffer->fb= -1;
+
+	if (buffer->texture.id) {
+		glDeleteTextures(1, &buffer->texture.id);
+	}
+	buffer->texture.id = 0;
+	buffer->texture.width = -1;
+	buffer->texture.height = -1;
+}